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Si5368
P R E L I M I N A R Y D A TA S H E E T
AN Y -R A T E P R E C I S I O N C L O C K MU L T I P L I E R /JITTER A T T E N U A T O R
Description
The Si5368 is a jitter-attenuating precision clock multiplier for applications requiring sub 1 ps rms jitter performance. The Si5368 accepts four clock inputs ranging from 2 kHz to 710 MHz and generates five independent, synchronous clock outputs ranging from 2 kHz to 945 MHz and select frequencies to 1.4 GHz. The device provides virtually any frequency translation combination across this operating range. The outputs are divided down separately from a common source. The Si5368 input clock frequency and clock multiplication ratio are programmable through an I2C or SPI interface. The Si5368 is based on Silicon Laboratories' 3rdgeneration DSPLL(R) technology, which provides any-rate frequency synthesis and jitter attenuation in a highly integrated PLL solution that eliminates the need for external VCXO and loop filter components. The DSPLL loop bandwidth is digitally programmable, providing jitter performance optimization at the application level. Operating from a single 1.8 or 2.5 V supply, the Si5368 is ideal for providing clock multiplication and jitter attenuation in high performance timing applications.
Features
Generates any frequency from 2 kHz to 945 MHz and select frequencies to 1.4 GHz from an input frequency of 2 kHz to 710 MHz Ultra-low jitter clock outputs w/jitter generation as low as 0.3 ps rms (50 kHz-80 MHz) Integrated loop filter with selectable loop bandwidth (60 Hz to 8.4 kHz) Meets OC-192 GR-253-CORE jitter specifications Four clock inputs w/manual or automatically controlled hitless switching Five clock outputs with selectable signal format (LVPECL, LVDS, CML, CMOS) SONET frame sync switching and regeneration Support for ITU G.709 and custom FEC ratios (255/238, 255/237, 255/236) LOL, LOS, FOS alarm outputs Digitally-controlled output phase adjust I2C or SPI programmable settings On-chip voltage regulator for 1.8 or 2.5 V 10% operation Small size: 14 x 14 mm 100-pin TQFP Pb-free, RoHS compliant
Applications
SONET/SDH OC-48/OC-192 line cards GbE/10GbE, 1/2/4/8/10GFC line cards ITU G.709 and custom FEC line cards Wireless basestations Data converter clocking xDSL SONET/SDH + PDH clock synthesis Test and measurement
Xtal or Refclock
CKIN1 CKIN2 CKIN3 CKIN4
/ N31 / N32 / N33 / N34 / N2 / NC3 CKOUT3
/ NC1
CKOUT1
DSPLL
(R)
/ NC2
CKOUT2
I2C/SPI Port Rate Select Clock Select Latency Control FSYNC Realignment Device Interrupt LOL/LOS/FOS Alarms Control Output Clock 2 Input Clock 3 Input Clock 4 / NFS CKOUT5/FS_OUT VDD (1.8 or 2.5 V) GND / NC4 CKOUT4
Preliminary Rev. 0.3 3/07
Copyright (c) 2007 by Silicon Laboratories
Si5368
This information applies to a product under development. Its characteristics and specifications are subject to change without notice.
Si5368
Table 1. Performance Specifications
(VDD = 1.8 or 2.5 V 10%, TA = -40 to 85 C)
Parameter Temperature Range Supply Voltage
Symbol TA VDD IDD
Test Condition
Min -40 2.25 1.62
Typ 25 2.5 1.8 394
Max 85 2.75 1.98 435
Unit C V V mA
Supply Current
fOUT = 622.08 MHz All CKOUTs enabled LVPECL format output Only CKOUT1 enabled fOUT = 19.44 MHz All CKOUTs enabled CMOS format output Only CKOUT1 enabled Tristate/Sleep Mode
--
-- --
253 278
284 321
mA mA
-- -- 0.002
229 TBD --
261 TBD 710
mA mA MHz
Input Clock Frequency (CKIN1, CKIN2, CKIN3, CKIN4) Input Clock Frequency (CKIN3, CKIN4 used as FSYNC inputs) Output Clock Frequency (CKOUT1, CKOUT2, CKOUT3, CKOUT4, CKOUT5 used as fifth high-speed output) CKOUT5 used as frame sync output (FS_OUT) Differential Voltage Swing Common Mode Voltage
CKF
CKF
CKOF
Input frequency and clock multiplication ratio determined by programming device PLL dividers. Consult Silicon Laboratories configuration software DSPLLsim or Any-Rate Precision Clock Family Reference Manual at www.silabs.com/timing to determine PLL divider settings for a given input frequency/clock multiplication ratio combination.
0.002
--
0.512
MHz
0.002 970 1213
-- -- --
945 1134 1417
MHz
CKOF
0.002
--
710
MHz
Input Clocks (CKIN1, CKIN2, CKIN3, CKIN4) CKNDPP CKNVCM CKNTRF CKNDC 1.8 V 10% 2.5 V 10% Rise/Fall Time Duty Cycle 20-80% Whichever is less 0.25 0.9 1.0 -- 40 50 -- -- -- -- -- -- 1.9 1.4 1.7 11 60 -- VPP V V ns % ns
Note: For a more comprehensive listing of device specifications, please consult the Silicon Laboratories Any-Rate Precision Clock Family Reference Manual. This document can be downloaded from www.silabs.com/timing.
2
Preliminary Rev. 0.3
Si5368
Table 1. Performance Specifications (Continued)
(VDD = 1.8 or 2.5 V 10%, TA = -40 to 85 C)
Parameter
Symbol
Test Condition
Min
Typ
Max
Unit
Output Clocks (CKOUT1, CKOUT2, CKOUT3, CKOUT4, CKOUT5/FS_OUT) Common Mode Differential Output Swing Single Ended Output Swing PLL Performance Jitter Generation JGEN fOUT = 622.08 MHz, LVPECL output format 50 kHz-80 MHz 12 kHz-20 MHz Jitter Transfer External Reference Jitter Transfer Phase Noise JPK JPKEXTN CKOPN fOUT = 622.08 MHz 100 Hz offset 1 kHz offset 10 kHz offset 100 kHz offset 1 MHz offset Subharmonic Noise Spurious Noise Package Thermal Resistance Junction to Ambient JA Still Air -- 40 -- C/W SPSUBH Phase Noise @ 100 kHz Offset SPSPUR Max spur @ n x F3 (n > 1, n x F3 < 100 MHz) -- 0.3 TBD ps rms VOCM VOD VSE LVPECL 100 load line-to-line VDD - 1.42 1.1 0.5 -- -- -- VDD - 1.25 1.9 0.93 V VDD Vpp
-- -- -- -- -- -- -- -- -- --
0.3 0.05 TBD TBD TBD TBD TBD TBD TBD TBD
TBD 0.1 TBD TBD TBD TBD TBD TBD TBD TBD
ps rms dB dB dBc/Hz dBc/Hz dBc/Hz dBc/Hz dBc/Hz dBc dBc
Note: For a more comprehensive listing of device specifications, please consult the Silicon Laboratories Any-Rate Precision Clock Family Reference Manual. This document can be downloaded from www.silabs.com/timing.
Preliminary Rev. 0.3
3
Si5368
155.52 MHz in, 622.08 MHz out
0 -20 Phase Noise (dBc/Hz) -40 -60 -80 -100 -120 -140 -160 100 1000 10000 100000 1000000 10000000 100000000 Offset Frequency (Hz)
Figure 1. Typical Phase Noise Plot Table 2. Absolute Maximum Ratings
Parameter DC Supply Voltage LVCMOS Input Voltage Junction Temperature Storage Temperature Range ESD HBM Tolerance (100 pF, 1.5 k) ESD MM Tolerance Latch-Up Tolerance Symbol VDD VDIG TJCT TSTG Value -0.5 to 2.75 -0.3 to (VDD + 0.3) -55 to 150 -55 to 150 2 200 JESD78 Compliant Unit V V C C kV V
Note: Permanent device damage may occur if the Absolute Maximum Ratings are exceeded. Functional operation should be restricted to the conditions as specified in the operation sections of this data sheet. Exposure to absolute maximum rating conditions for extended periods of time may affect device reliability.
4
Preliminary Rev. 0.3
Si5368
Figure 2. Si5368 Typical Application Circuit (I2C Control Mode)
Figure 3. Si5368 Typical Application Circuit (SPI Control Mode)
Preliminary Rev. 0.3
5
Si5368
1. Functional Description
The Si5368 is a jitter-attenuating precision clock multiplier for applications requiring sub 1 ps rms jitter performance. The Si5368 accepts four clock inputs ranging from 2 kHz to 710 MHz and generates five independent, synchronous clock outputs ranging from 2 kHz to 945 MHz and select frequencies to 1.4 GHz. The device provides virtually any frequency translation combination across this operating range. Independent dividers are available for every input clock and output clock, so the Si5368 can accept input clocks at different frequencies and it can generate output clocks at different frequencies. The Si5368 input clock frequency and clock multiplication ratio are programmable through Optionally, the fifth clock an I2C or SPI interface. output can be configured as a 2 to 512 kHz SONET/SDH frame synchronization output that is phase aligned with one of the high-speed output clocks. Silicon Laboratories offers a PC-based software utility, DSPLLsim, that can be used to determine the optimum PLL divider settings for a given input frequency/clock multiplication ratio combination that minimizes phase noise and power consumption. This utility can be downloaded from www.silabs.com/timing. The Si5368 is based on Silicon Laboratories' 3rdgeneration DSPLL(R) technology, which provides anyrate frequency synthesis and jitter attenuation in a highly integrated PLL solution that eliminates the need for external VCXO and loop filter components. The Si5368 PLL loop bandwidth is digitally programmable and supports a range from 60 Hz to 8.4 kHz. The DSPLLsim software utility can be used to calculate valid loop bandwidth settings for a given input clock frequency/clock multiplication ratio. The Si5368 supports hitless switching between input clocks in compliance with GR-253-CORE and GR-1244CORE that greatly minimizes the propagation of phase transients to the clock outputs during an input clock transition (<200 ps typ). Manual, automatic revertive and non-revertive input clock switching options are available. The Si5368 monitors the four input clocks for loss-of-signal and provides a LOS alarm when it detects missing pulses on any of the four input clocks. The device monitors the lock status of the PLL. The lock detect algorithm works by continuously monitoring the phase of the input clock in relation to the phase of the feedback clock. The Si5368 monitors the frequency of CKIN1, CKIN3, and CKIN4 with respect to a reference frequency applied to CKIN2, and generates a frequency offset alarm (FOS) if the threshold is exceeded. This FOS feature is available for SONET applications in which both the monitored frequency on CKIN1, CKIN3, and CKIN4 and the reference frequency are integer multiples of 19.44 MHz. Both Stratum 3/3E and SONET Minimum Clock (SMC) FOS thresholds are supported. The Si5368 provides a digital hold capability that allows
6
the device to continue generation of a stable output clock when the selected input reference is lost. During digital hold, the DSPLL generates an output frequency based on a historical average that existed a fixed amount of time before the error event occurred, eliminating the effects of phase and frequency transients that may occur immediately preceding digital hold. Fine phase adjustment is available and is set using the FLAT register bits. The nominal range and resolution of the FLAT[14:0] latency adjustment word are: 110 ps and 3.05 ps, respectively. The Si5368 has five differential clock outputs. The electrical format of the clock outputs is programmable to support LVPECL, LVDS, CML, or CMOS loads. If not required, unused clock outputs can be powered down to minimize power consumption. The phase difference between the selected input clock and the output clocks is adjustable in 200 ps increments for system skew control. In addition, the phase of one output clock may be adjusted in relation to the phase of the other output clock. The resolution varies from 800 ps to 2.2 ns depending on the PLL divider settings. Consult the DSPLLsim configuration software to determine the phase offset resolution for a given input clock/clock multiplication ratio combination. For system-level debugging, a bypass mode is available which drives the output clock directly from the input clock, bypassing the internal DSPLL. The device is powered by a single 1.8 or 2.5 V supply.
1.1. External Reference
An external, 38.88 MHz clock or a low-cost 114.285 MHz 3rd overtone crystal is used as part of a fixed-frequency oscillator within the DSPLL. This external reference is required for the device to perform jitter attenuation. Silicon Laboratories recommends using a high-quality crystal from TXC (www.txc.com.tw), part number 7MA1400014. An external 38.88 MHz clock from a high quality OCXO or TCXO can also be used as a reference for the device. In digital hold, the DSPLL remains locked to this external reference. Any changes in the frequency of this reference when the DSPLL is in digital hold, will be tracked by the output of the device. Note that crystals can have temperature sensitivities.
1.2. Further Documentation
Consult the Silicon Laboratories Any-Rate Precision Clock Family Reference Manual (FRM) for more detailed information about the Si5368. The FRM can be downloaded from www.silabs.com/timing. Silicon Laboratories has developed a PC-based software utility called DSPLLsim to simplify device configuration, including frequency planning and loop bandwidth selection. This utility can be downloaded from www.silabs.com/timing.
Preliminary Rev. 0.3
Si5368
2. Pin Descriptions: Si5368
VDD CKOUT4+
CKOUT2+
CKOUT1+
CKOUT3+
CKOUT4-
CKOUT2-
CKOUT1-
CKOUT3-
FS_OUT+
FS_OUT- VDD
CMODE
VDD
VDD
NC VDD
VDD
VDD
VDD
VDD
VDD
NC NC RST NC VDD VDD GND GND C1B C2B C3B INT_ALM CS0_C3A GND VDD XA XB GND GND NC FS_ALIGN NC NC NC NC
100 99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 80 79 78 77 76 75 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 74 73 72 71 70 69 68 67 66 65 64 63 62 61 60 59
VDD
NC
NC
NC NC NC NC SDI A2_SS A1 A0 NC NC GND GND VDD VDD SDA_SDO SCL C2A C1A CS1_C4A NC INC DEC NC NC NC
Si5368
GND PAD
58 57 56 55 54 53 52
51 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 CKIN4- CKIN4+ CKIN2+ CKIN3+ CKIN1+ CKIN1- GND GND GND GND GND GND GND GND VDD CKIN2- CKIN3- RATE1 RATE0 LOL NC NC NC NC
GND
Table 3. Si5368 Pin Descriptions
Pin # 1, 2, 4, 20, 22, 23, 24, 25, 37, 47, 48, 50, 51, 52, 53, 56, 66, 67, 72, 73, 74, 75, 80, 85, 95 3 Pin Name NC I/O Signal Level Description No Connect. These pins must be left unconnected for normal operation.
RST
I
LVCMOS
External Reset. Active low input that performs external hardware reset of device. Resets all internal logic to a known state and forces the device registers to their default value. Clock outputs are tristated during reset. After rising edge of RST signal, the device will perform an internal self-calibration. This pin has a weak pull-up.
Note: Internal register names are indicated by underlined italics, e.g. INT_PIN. See Si5368 Register Map.
Preliminary Rev. 0.3
7
Si5368
Table 3. Si5368 Pin Descriptions (Continued)
Pin # 5, 6, 15, 27, 62, 63, 76, 79, 81, 84, 86, 89, 91, 94, 96, 99, 100 Pin Name VDD I/O Vdd Signal Level Supply Description VDD. The device operates from a 1.8 or 2.5 V supply. Bypass capacitors should be associated with the following VDD pins: Pins Bypass Cap 5, 6 0.1 F 15 0.1 F 27 0.1 F 62, 63 0.1 F 76, 79 1.0 F 81, 84 0.1 F 86, 89 0.1 F 91, 94 0.1 F 96, 99, 100 0.1 F Ground. This pin must be connected to system ground. Minimize the ground path impedance for optimal performance.
7, 8, 14, 18, 19, 26, 28, 31, 33, 36, 38, 41, 43, 46, 64, 65 9
GND
GND
Supply
C1B
O
LVCMOS
CKIN1 Invalid Indicator. This pin performs the CK1_BAD function if CK1_BAD_PIN = 1 and is tristated if CK1_BAD_PIN = 0. Active polarity is controlled by CK_BAD_POL. 0 = No alarm on CKIN1. 1 = Alarm on CKIN1. CKIN2 Invalid Indicator. This pin performs the CK2_BAD function if CK2_BAD_PIN = 1 and is tristated if CK2_BAD_PIN = 0. Active polarity is controlled by CK_BAD_POL. 0 = No alarm on CKIN2. 1 = Alarm on CKIN2. CKIN3 Invalid Indicator. This pin performs the CK3_BAD function if CK3_BAD_PIN = 1 and is tristated if CK3_BAD_PIN = 0. Active polarity is controlled by CK_BAD_POL. 0 = No alarm on CKIN3. 1 = Alarm on CKIN3. Interrupt/Alarm Output Indicator. This pin functions as a maskable interrupt output with active polarity controlled by the INT_POL register bit. The INT output function can be turned off by setting INT_PIN = 0. If the ALRMOUT function is desired instead on this pin, set ALRMOUT_PIN = 1 and INT_PIN = 0. 0 = ALRMOUT not active. 1 = ALRMOUT active. The active polarity is controlled by CK_BAD_POL. If no function is selected, the pin tristates.
10
C2B
O
LVCMOS
11
C3B
O
LVCMOS
12
INT_ALM
O
LVCMOS
Note: Internal register names are indicated by underlined italics, e.g. INT_PIN. See Si5368 Register Map.
8
Preliminary Rev. 0.3
Si5368
Table 3. Si5368 Pin Descriptions (Continued)
Pin # 13 57 Pin Name CS0_C3A CS1_C4A I/O I/O Signal Level LVCMOS Description Input Clock Select/CKIN3 or CKIN4 Active Clock Indicator. If manual clock selection is chosen, and if CKSEL_PIN = 1, the CKSEL pins control clock selection and the CKSEL_REG bits are ignored. CS[1:0] 00 01 10 11 Active Input Clock CKIN1 CKIN2 CKIN3 CKIN4
If CKSEL_PIN = 0, the CKSEL_REG register bits control this function and these inputs tristate. If these pins are not functioning as the CS[1:0] inputs and auto clock selection is enabled, then they serve as the CKIN_n active clock indicator. 0 = CKIN3 (CKIN4) is not the active input clock 1 = CKIN3 (CKIN4) is currently the active input to the PLL The CKn_ACTV_REG bit always reflects the active clock status for CKIN_n. If CKn_ACTV_PIN = 1, this status will also be reflected on the CnA pin with active polarity controlled by the CK_ACTV_POL bit. If CKn_ACTV_PIN = 0, this output tristates. This pin has a weak pull-down. 16 17 XA XB I ANALOG External Crystal or Reference Clock. External crystal should be connected to these pins to use external oscillator based reference. If a single-ended external reference is used, ac couple reference clock to XA input and leave XB pin floating. External reference must be from a high-quality clock source (TCXO, OCXO). Frequency of crystal or external clock is set by the RATE pins. FSYNC Alignment Control. If FSYNC_ALIGN_PIN = 1 and CK_CONFIG = 1, a logic high on this pin causes the FS_OUT phase to be realigned to the rising edge of the currently active input sync (CKIN_3 or CKIN_4). If FSYNC_ALIGN_PIN = 0, this pin is ignored and the FSYNC_ALIGN_REG bit performs this function. 0 = No realignment. 1 = Realign. This pin has a weak pull-down. Clock Input 4. Differential clock input. This input can also be driven with a single-ended signal. CKIN4 serves as the frame sync input associated with the CKIN2 clock when CK_CONFIG_REG = 1.
21
FS_ALIGN
I
LVCMOS
29 30
CKIN4+ CKIN4-
I
MULTI
Note: Internal register names are indicated by underlined italics, e.g. INT_PIN. See Si5368 Register Map.
Preliminary Rev. 0.3
9
Si5368
Table 3. Si5368 Pin Descriptions (Continued)
Pin # 32 42 Pin Name RATE1 RATE0 I/O I Signal Level 3-Level Description External Crystal or Reference Clock Rate. Three level inputs that select the type and rate of external crystal or reference clock to be applied to the XA/XB port. Settings: HH = No Crystal or Reference Clock. Converts part to a Si5367 device. See Si5367 Data Sheet for operation. (Wideband). MM = 114.285 MHz 3rd OT crystal (Narrowband). LM = 38.88 MHz external clock (Narrowband). All others = Reserved. Clock Input 2. Differential input clock. This input can also be driven with a single-ended signal. Clock Input 3. Differential clock input. This input can also be driven with a single-ended signal. CKIN3 serves as the frame sync input associated with the CKIN1 clock when CK_CONFIG_REG = 1. Clock Input 1. Differential clock input. This input can also be driven with a single-ended signal. PLL Loss of Lock Indicator. This pin functions as the active high PLL loss of lock indicator if the LOL_PIN register bit is set to one. 0 = PLL locked. 1 = PLL unlocked. If LOL_PIN = 0, this pin will tristate. Active polarity is controlled by the LOL_POL bit. The PLL lock status will always be reflected in the LOL_INT read only register bit. Coarse Latency Decrement. A pulse on this pin decreases the input to output device latency by 1/fOSC (approximately 200 ps). Detailed operations and timing characteristics for this pin may be found in the Any-Rate Precision Clock Family Reference Manual. There is no limit on the range of latency adjustment by this method. Pin control is enabled by setting INCDEC_PIN = 1 (default). If INCDEC_PIN = 0, this pin is ignored and coarse output latency is controlled via the CLAT register. If both INC and DEC are tied high, phase buildout is disabled and the device maintains a fixed-phase relationship between the selected input clock and the output clock during an input clock switch. Detailed operations and timing characteristics for these pins may be found in the Any-Rate Precision Clock Family Reference Manual. This pin has a weak pull-down.
34 35 39 40
CKIN2+ CKIN2- CKIN3+ CKIN3-
I
MULTI
I
MULTI
44 45 49
CKIN1+ CKIN1- LOL
I
MULTI
O
LVCMOS
54
DEC
I
LVCMOS
Note: Internal register names are indicated by underlined italics, e.g. INT_PIN. See Si5368 Register Map.
10
Preliminary Rev. 0.3
Si5368
Table 3. Si5368 Pin Descriptions (Continued)
Pin # 55 Pin Name INC I/O I Signal Level LVCMOS Description Coarse Latency Increment. A pulse on this pin increases the input to output device latency by 1/fOSC (approximately 200 ps). Detailed operations and timing characteristics for this pin may be found in the Any-Rate Precision Clock Family Reference Manual. There is no limit on the range of latency adjustment by this method. Pin control is enabled by setting INCDEC_PIN = 1 (default). If INCDEC_PIN = 0, this pin is ignored and coarse output latency is controlled via the CLAT register. If both INC and DEC are tied high, phase buildout is disabled and the device maintains a fixed-phase relationship between the selected input clock and the output clock during an input clock switch. Detailed operations and timing characteristics for these pins may be found in the Any-Rate Precision Clock Family Reference Manual. This pin has a weak pull-down. CKIN1 Active Clock Indicator. This pin serves as the CKIN1 active clock indicator. The CK1_ACTV_REG bit always reflects the active clock status for CKIN1. If CK1_ACTV_PIN = 1, this status will also be reflected on the C1A pin with active polarity controlled by the CK_ACTV_POL bit. If CK1_ACTV_PIN = 0, this output tristates. CKIN2 Active Clock Indicator. This pin serves as the CKIN2 active clock indicator. The CK2_ACTV_REG bit always reflects the active clock status for CKIN_2. If CK2_ACTV_PIN = 1, this status will also be reflected on the C2A pin with active polarity controlled by the CK_ACTV_POL bit. If CK2_ACTV_PIN = 0, this output tristates. Serial Clock. This pin functions as the serial port clock input for both SPI and I2C modes. This pin has a weak pull-down. Serial Data. In I2C microprocessor control mode (CMODE = 0), this pin functions as the bidirectional serial data port.In SPI microprocessor control mode (CMODE = 1), this pin functions as the serial data output. Serial Port Address. In I2C microprocessor control mode (CMODE = 0), these pins function as hardware controlled address bits. In SPI microprocessor control mode (CMODE = 1), these pins are ignored. This pin has a weak pull-down. Serial Port Address/Slave Select. In I2C microprocessor control mode (CMODE = 0), this pin functions as a hardware controlled address bit. In SPI microprocessor control mode (CMODE = 1), this pin functions as the slave select input. This pin has a weak pull-down.
58
C1A
O
LVCMOS
59
C2A
O
LVCMOS
60
SCL
I
LVCMOS
61
SDA_SDO
I/O
LVCMOS
68 69
A0 A1
I
LVCMOS
70
A2_SS
I
LVCMOS
Note: Internal register names are indicated by underlined italics, e.g. INT_PIN. See Si5368 Register Map.
Preliminary Rev. 0.3
11
Si5368
Table 3. Si5368 Pin Descriptions (Continued)
Pin # 71 Pin Name SDI I/O I Signal Level LVCMOS Description Serial Data In. In SPI microprocessor control mode (CMODE = 1), this pin functions as the serial data input. In I2C microprocessor control mode (CMODE = 0), this pin is ignored. This pin has a weak pull-down. Clock Output 3. Differential clock output. Output signal format is selected by SFOUT3_REG register bits. Output is differential for LVPECL, LVDS, and CML compatible modes. For CMOS format, both output pins drive identical single-ended clock outputs. Clock Output 1. Differential clock output. Output signal format is selected by SFOUT1_REG register bits. Output is differential for LVPECL, LVDS, and CML compatible modes. For CMOS format, both output pins drive identical single-ended clock outputs. Frame Sync Output. Differential frame sync output or fifth high-speed clock output. Output signal format is selected by SFOUT_FSYNC_REG register bits. Output is differential for LVPECL, LVDS, and CML compatible modes. For CMOS format, both output pins drive identical single-ended clock outputs. Duty cycle and active polarity are controlled by FSYNC_PW and FSYNC_POL bits, respectively. Detailed operations and timing characteristics for these pins may be found in the Any-Rate Precision Clock Family Reference Manual. Control Mode. Selects I2C or SPI control mode for the device. 0 = I2C Control Mode. 1 = SPI Control Mode. Clock Output 2. Differential clock output. Output signal format is selected by SFOUT2_REG register bits. Output is differential for LVPECL, LVDS, and CML compatible modes. For CMOS format, both output pins drive identical single-ended clock outputs. Clock Output 4. Differential clock output. Output signal format is selected by SFOUT4_REG register bits. Output is differential for LVPECL, LVDS, and CML compatible modes. For CMOS format, both output pins drive identical single-ended clock outputs. Ground Pad. The ground pad must provide a low thermal and electrical impedance to a ground plane.
77 78
CKOUT3+ CKOUT3-
O
MULTI
82 83
CKOUT1- CKOUT1+
O
MULTI
87 88
FS_OUT- FS_OUT+
O
MULTI
90
CMODE
I
LVCMOS
92 93
CKOUT2+ CKOUT2-
O
MULTI
97 98
CKOUT4- CKOUT4+
O
MULTI
GND PAD
GND PAD
GND
Supply
Note: Internal register names are indicated by underlined italics, e.g. INT_PIN. See Si5368 Register Map.
12
Preliminary Rev. 0.3
Si5368
3. Ordering Guide
Ordering Part Number Si5368A-B-GQ Output Clock Frequency Range 2 kHz-945 MHz 970-1134 MHz 1.213-1.417 GHz 2 kHz-808 MHz 2 kHz-346 MHz Package 100-Pin 14 x 14 mm TQFP Temperature Range -40 to 85 C
Si5368B-B-GQ SI5368C-B-GQ
100-Pin 14 x 14 mm TQFP 100-Pin 14 x 14 mm TQFP
-40 to 85 C -40 to 85 C
Preliminary Rev. 0.3
13
Si5368
4. Package Outline: 100-Pin TQFP
Figure 4 illustrates the package details for the Si5368. Table 4 lists the values for the dimensions shown in the illustration.
Figure 4. 100-Pin Thin Quad Flat Package (TQFP)
Table 4. 100-Pin Package Diagram Dimensions
Dimension A A1 A2 b c D D1 D2 e 3.85 Min -- 0.05 0.95 0.17 0.09 Nom -- -- 1.00 0.22 -- 16.00 BSC. 14.00 BSC. 4.00 0.50 BSC. 4.15 Max 1.20 0.15 1.05 0.27 0.20 Dimension E E1 E2 L aaa bbb ccc ddd 3.85 0.45 -- -- -- -- 0 Min Nom 16.00 BSC. 14.00 BSC. 4.00 0.60 -- -- -- -- 3.5 4.15 0.75 0.20 0.20 0.08 0.08 7 Max
Notes: 1. All dimensions shown are in millimeters (mm) unless otherwise noted. 2. Dimensioning and Tolerancing per ANSI Y14.5M-1994. 3. This package outline conforms to JEDEC MS-026, variant AED-HD. 4. Recommended card reflow profile is per the JEDEC/IPC J-STD-020C specification for Small Body Components.
14
Preliminary Rev. 0.3
Si5368
5. Recommended PCB Layout
Figure 5. PCB Land Pattern Diagram
Preliminary Rev. 0.3
15
Si5368
Table 5. PCB Land Pattern Dimensions
Dimension e E D E2 D2 GE GD X Y ZE ZD R1 R2 -- -- -- 0.15 REF 1.00 3.90 3.90 13.90 13.90 -- 1.50 REF. 16.90 16.90 MIN 0.50 BSC. 15.40 REF. 15.40 REF. 4.10 4.10 -- -- 0.30 MAX
Notes (General): 1. All dimensions shown are in millimeters (mm) unless otherwise noted. 2. Dimensioning and Tolerancing is per the ANSI Y14.5M-1994 specification. 3. This Land Pattern Design is based on IPC-7351 guidelines. 4. All dimensions shown are at Maximum Material Condition (MMC). Least Material Condition (LMC) is calculated based on a Fabrication Allowance of 0.05 mm. Notes (Solder Mask Design): 1. All metal pads are to be non-solder mask defined (NSMD). Clearance between the solder mask and the metal pad is to be 60 m minimum, all the way around the pad. Notes (Stencil Design): 1. A stainless steel, laser-cut and electro-polished stencil with trapezoidal walls should be used to assure good solder paste release. 2. The stencil thickness should be 0.125 mm (5 mils). 3. The ratio of stencil aperture to land pad size should be 1:1 for the perimeter pads. 4. A 4 x 4 array of 0.80 mm square openings on 1.05 mm pitch should be used for the center ground pad. Notes (Card Assembly): 1. A No-Clean, Type-3 solder paste is recommended. 2. The recommended card reflow profile is per the JEDEC/IPC J-STD-020C specification for Small Body Components.
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Preliminary Rev. 0.3
Si5368
DOCUMENT CHANGE LIST
Revision 0.1 to Revision 0.2
Changed LVTTL to LVCMOS in Table 2, "Absolute Maximum Ratings," on page 4. Updated Figure 2 and Figure 3 on page 5. Updated "2. Pin Descriptions: Si5368".
Added RATE0 to pin description. By changing RATE[1:0] the part can emulate a Si5367. Changed XA/XB pin description to support both differential and single ended external REFCLK.
Revision 0.2 to Revision 0.3
Added Figure 1, "Typical Phase Noise Plot," on page 4. Updated Figure 2, "Si5368 Typical Application Circuit (I2C Control Mode)," and Figure 3, "Si5368 Typical Application Circuit (SPI Control Mode)," on page 5 to show INC and DEC. Updated "2. Pin Descriptions: Si5368".
Changed font of register names to underlined italics.
Updated "3. Ordering Guide" on page 13. Added "5. Recommended PCB Layout".
Preliminary Rev. 0.3
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Si5368
CONTACT INFORMATION
Silicon Laboratories Inc. 400 West Cesar Chavez Austin, TX 78701 Tel: 1+(512) 416-8500 Fax: 1+(512) 416-9669 Toll Free: 1+(877) 444-3032 Email: Clockinfo@silabs.com Internet: www.silabs.com
The information in this document is believed to be accurate in all respects at the time of publication but is subject to change without notice. Silicon Laboratories assumes no responsibility for errors and omissions, and disclaims responsibility for any consequences resulting from the use of information included herein. Additionally, Silicon Laboratories assumes no responsibility for the functioning of undescribed features or parameters. Silicon Laboratories reserves the right to make changes without further notice. Silicon Laboratories makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Silicon Laboratories assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. Silicon Laboratories products are not designed, intended, or authorized for use in applications intended to support or sustain life, or for any other application in which the failure of the Silicon Laboratories product could create a situation where personal injury or death may occur. Should Buyer purchase or use Silicon Laboratories products for any such unintended or unauthorized application, Buyer shall indemnify and hold Silicon Laboratories harmless against all claims and damages. Silicon Laboratories, Silicon Labs, and DSPLL are trademarks of Silicon Laboratories Inc. Other products or brandnames mentioned herein are trademarks or registered trademarks of their respective holders.
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Preliminary Rev. 0.3

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