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DS21610 3.3V/5V Clock Rate Adapter
www.maxim-ic.com
GENERAL DESCRIPTION
The DS21610 is a multirate, low-jitter clock adapter that converts E-carrier and T-carrier clocks to multiple PDH carrier clock rates. Two clock outputs are available that are frequency-locked to the input clock. The clock outputs along with an 8kHz framesync output can be phase-aligned to a frame-sync input. The device is backward compatible with the LXP610 and operates from either a 3.3V or 5V supply. All modes of operation include a standard 8kHz output.
FEATURES
Direct Replacement for LXP610SE Converts E-Carrier Clock Rates to T-Carrier Clock Rates Converts T-Carrier Clock Rates to E-Carrier Clock Rates 3.3V or 5V Supply Low Jitter Output Multiple Output Clocks Synchronized to Input Clock 8kHz Frequency-Locked Output for all Operation Modes No External Components Required 16-Pin SO and 28-Pin PLCC Industrial Temperature Range: -40C to +85C
PIN CONFIGURATION
TOP VIEW

ORDERING INFORMATION
Dallas Semiconductor DS21610
PART DS21610SN DS21610QN
TEMP RANGE
-40C to +85C -40C to +85C
PIN-PACKAGE 16 SO 29 PLCC
SO
Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata.
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REV: 113004
DS21610 3.3V/5V Clock Rate Adapter
TABLE OF CONTENTS
1.
1.1
PIN DESCRIPTION ......................................................................................................................3
COMPATIBILITY WITH LXP610.........................................................................................................................3
2. 3.
3.1
FUNCTIONAL DESCRIPTION......................................................................................................5 OUTPUT JITTER ..........................................................................................................................6
JITTER TRANSFER ..........................................................................................................................................6
4. 5. 6.
OPERATING PARAMETERS .......................................................................................................8 PACKAGE INFORMATION ........................................................................................................13 REVISION HISTORY ..................................................................................................................15
LIST OF FIGURES
Figure 1-1. Block Diagram ....................................................................................................................4 Figure 3-1. Nominal Jitter Transfer (1.544MHz CLKIN to 2.048MHz CLKOUT1) ..................................6 Figure 3-2. Nominal Jitter Transfer (2.048MHz CLKIN to 1.544MHz CLKOUT1) ..................................7 Figure 4-1. SYNCIN/CLKIN to CLKOUT1/SYNCOUT and CLKOUT2 ................................................ 10 Figure 4-2. Output Frame-Sync Alignment When CLKOIT2 = 2 x CLKOUT1 ..................................... 11 Figure 4-3. Output Frame-Sync Alignment When CLKOUT2 = 3 x CLKOUT1.................................... 11 Figure 4-4. Output Frame-Sync Alignment When CLKOIT2 = 4 x CLKOUT1 ..................................... 12 Figure 4-5. Output Frame-Sync Alignment When CLKOUT2 = 5 x CLKOUT1.................................... 12
LIST OF TABLES
Table 1-A. Pin Description ....................................................................................................................3 Table 1-B. Pin Name Cross-Reference to LXP610 ...............................................................................3 Table 2-A. Program Pin Functions (SEL = 0)........................................................................................5 Table 2-B. Program Pin Functions (SEL = 1)........................................................................................5 Table 3-A. Output Jitter Specifications, CLKOUT1 = 1.544MHz ...........................................................6 Table 3-B. Output Jitter Specifications, CLKOUT1 = 2.048MHz ...........................................................6
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DS21610 3.3V/5V Clock Rate Adapter
1. PIN DESCRIPTION
Table 1-A. Pin Description
PIN PLCC 1 2 3-5, 7-9, 11, 12, 17- 19, 21, 23, 25, 26 6 10 13 14 15 16 20 22 24 27 28 SO 1 2 3, 6, 11 4 5 7 8 9 10 12 13 14 15 16 NAME P3 SYNCOUT N.C. CLKOUT2 CLKIN CLKOUT1 P1 VSS P2 SEL FSP SYNCIN P4 VDD TYPE Input Output -- Output Input Output Input Supply Input Input Input Input Input Supply FUNCTION Program Pin 3. Used to select the various combinations of clock and sync outputs. Synchronization Pulse Output. An 8kHz output that can be synchronized to the clock outputs and SYNCIN (if present). No Connect Clock Output 2. T1 or E1 carrier clock output referenced to CLKIN. Clock Input. Reference Clock Input. CLKOUT1 and CLKOUT2 will be referenced to this clock. Clock Output 1. T1 or E1 carrier clock output referenced to CLKIN. Program Pin 3. Used to select the various combinations of clock and sync outputs. Ground Program Pin 2. Used to select the various combinations of clock and sync outputs. Clock Mode Select. T-carrier/E-carrier mode select. Frame Synchronization Pulse Polarity. Used to change the polarity of the SYNCOUT output. Synchronization Pulse Input. Used to synchronize the clock outputs and SYNCOUT to CLKIN and SYNCIN. SYNCIN should be tied high or low when not in use. Program Pin 4. Used to select the various combinations of clock and sync outputs. Positive Supply, 3.3V or 5V 5%
1.1
Compatibility with LXP610
The DS21610 is pin compatible with the LXP610.
Table 1-B. Pin Name Cross-Reference to LXP610
DS21610 P3 SYNCOUT CLKOUT2 CLKIN CLKOUT1 P1 VSS P2 N.C. LXP610 P3 FSO HFO CLKI CLKO P1 GND P2 N.C. FUNCTION Program Pin 3 Synchronization Pulse Output Clock 2 Output Clock Input Clock 1 Output Program pin 1 Ground Program Pin 2 No Connect
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DS21610 3.3V/5V Clock Rate Adapter
Figure 1-1. Block Diagram
CLKOUT2 CLKIN ANALOG PLL FEEDBACK CIRCUIT
Dallas Semiconductor DS21610
OUTPUT DIVIDER
CLKOUT1
SEL SYNCIN FRAME SYNC GENERATOR
SYNCOUT FSP
P1 P2 P3 P4
FREQUENCY PLL SELECT LOGIC
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DS21610 3.3V/5V Clock Rate Adapter
2. FUNCTIONAL DESCRIPTION
A clock input at CLKIN is converted to various clocks available on CLKOUT1 and CLKOUT2. Additionally, an 8kHz clock locked to CLKIN and SYNCIN (if present) is always available at the SYNCOUT pin. The pulse width of the SYNCOUT is selectable. It can be one or one-half the clock period of CLKIN, centered on the rising edge of CLKIN. Pins P1 to P4 are used to select the various clock rates and operational modes. Table 2-A and Table 2-B list the various operational modes of the DS21610. CLKIN, CLKOUT1, and CLCKOUT2 are always frequency-locked. They can all be phase-locked to a system frame-sync pulse. A frame-sync pulse applied to SYNCIN will cause CLKIN and CLKOUT1 and CLKOUT2 to be phased-locked to that sync pulse. This causes the clocks to have a fixed alignment at the frame-sync boundaries. The signal applied to SYNCIN can be 8kHz or some integer subrate such as 1kHz, 2kHz, or 4kHz. Phase synchronization occurs within a maximum of 50ms when SYNCIN is 8kHz.
Table 2-A. Program Pin Functions (SEL = 0)
P4 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 P3 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 P2 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 P1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 CLKIN 1.544 3.088 1.544 1.544 1.544 6.176 1.544 6.176 3.088 3.088 3.088 1.544 6.176 6.176 6.176 6.176 CLKOUT1 2.048 2.048 2.048 2.048 2.560 4.096 2.560 2.048 2.048 4.096 2.048 4.096 2.560 4.096 2.560 4.096 CLKOUT2 6.144 8.192 6.144 8.192 7.680 8.192 7.680 8.192 6.144 8.192 6.144 8.192 7.680 8.192 7.680 8.192 SYNCOUT Long Short Long Short Long Long Long Short Long Long Long Long Long Long Long Long
Table 2-B. Program Pin Functions (SEL = 1)
P4 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 P3 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 P2 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 P1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 CLKIN 2.048 2.048 2.048 2.048 2.560 8.192 2.560 8.192 2.048 4.096 2.048 4.096 2.560 8.192 2.560 8.192 CLKOUT1 3.088 3.088 1.544 1.544 1.544 3.088 1.544 1.544 3.088 3.088 3.088 1.544 1.544 3.088 1.544 1.544 CLKOUT2 6.176 6.176 6.176 6.176 7.720 6.176 7.720 6.176 6.176 6.176 6.176 6.176 7.720 6.176 7.720 6.176 SYNCOUT Long Long Long Long Long Long Long Long Long Long Long Long Long Long Long Long
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DS21610 3.3V/5V Clock Rate Adapter
3. OUTPUT JITTER
Table 3-A shows the output jitter specifications for 2.048MHz (or 4.096MHz) to 1.544MHz conversions (SEL = 1) and 1.544MHz to 2.048MHz (or 4.096MHz) conversions (SEL = 0).
Table 3-A. Output Jitter Specifications, CLKOUT1 = 1.544MHz
FREQUENCY BAND No bandlimiting 10Hz-40kHz 8kHz-40kHz TR62411 SPECIFICATION TR62411 TR62411 TR62411 TYP 0.010 0.005 0.006 MAX 0.020 0.010 0.012 UNITS UIP-P UIP-P UIP-P
Table 3-B. Output Jitter Specifications, CLKOUT1 = 2.048MHz
FREQUENCY BAND 20Hz-100kHz 18kHz-100kHz G.823 SPECIFICATION 1.5 0.2 TYP 0.018 0.012 MAX 0.035 0.025 UNITS UIP-P UIP-P
3.1
Jitter Transfer
Figure 3-1 and Figure 3-2 show jitter transfer for 2.048MHz-to-1.544MHz conversions and vice versa.
Figure 3-1. Nominal Jitter Transfer (1.544MHz CLKIN to 2.048MHz CLKOUT1)
2.00 1.80
JITTER GAIN (ns/ns)
1.60 1.40 1.20 1.00 0.80 0.60 0.40 0.20 0.00 0 5 10 15 20 25 30 35 40
JITTER FREQUENCY (kHz)
NOTE: THE TYPICAL PEAK JITTER GAIN OF THE DS21610 IS ABOUT 1.6 FOR CONVERSION FROM T1 TO E1. THE TYPICAL PEAK-JITTER GAIN OF THE LEVEL ONE DEVICE IS ABOUT 1.1. HOWEVER, THE JITTER GAIN FOR THE DS21610 PEAKS IN THE 4kHz TO 8kHz RANGE, WHEREAS THE PEAK JITTER GAIN FOR THE LXP610 SPANS A GREATER FREQUENCY RANGE (20kHz TO 40kHz).
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DS21610 3.3V/5V Clock Rate Adapter
Figure 3-2. Nominal Jitter Transfer (2.048MHz CLKIN to 1.544MHz CLKOUT1)
2 1.8
JITTER GAIN (ns/ns)
1.6 1.4 1.2 1 0.8 0.6 0.4 0.2 0 0 10 20 30 40 50 60 70 80
JITTER FREQUENCY (kHz)
NOTE: THE TYPICAL PEAK JITTER GAIN OF THE DS2161 IS ABOUT 1.4 FOR CONVERSION FROM T1 TO E1. THE TYPICAL PEAK-JITTER GAIN OF THE LEVEL ONE DEVICE IS ABOUT 1.1. HOWEVER, THE JITTER GAIN FOR THE DS21610 PEAKS IN THE 4kHz TO 8kHz RANGE, WHEREAS THE PEAK JITTER GAIN FOR THE LXP610 SPANS A GREATER FREQUENCY RANGE (20kHz TO 40kHz).
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DS21610 3.3V/5V Clock Rate Adapter
4. OPERATING PARAMETERS ABSOLUTE MAXIMUM RATINGS
Voltage Range on Any Pin Relative to Ground Operating Temperature Range for DS21610SN Storage Temperature Range Soldering Temperature -1.0V to +6.0V -40C to +85C -55C to +125C See IPC/JEDEC J-STD-020 Specification
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods can affect device reliability.
RECOMMENDED DC OPERATING CONDITIONS
(TA = -40C to +85C) PARAMETER Logic 1 Logic 0 Supply Voltage SYMBOL VIH VIL VDD CONDITIONS 3.3V 5V MIN 2.0 -0.3 3.135 4.75 TYP 3.3 5 MAX 5.5 +0.8 3.465 5.25 UNITS V V V
DC CHARACTERISTICS
(VDD = 3.3V/5V 5%, TA = -40C to +85C.) PARAMETER Supply Current Input Leakage Output Leakage Output Current (2.4V) Output Current (0.4V)
Note 1: 100pF load on all outputs. Note 2: 0V < VIN < VDD.
SYMBOL IDD IIL ILO IOH IOL
CONDITIONS (Note 1) (Note 2)
MIN -10.0 -1.0 +4.0
TYP
MAX 14 +10.0
UNITS mA mA mA mA mA
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DS21610 3.3V/5V Clock Rate Adapter
AC TIMING
(Figure 4-1, Figure 4-2, Figure 4-3, Figure 4-4, and Figure 4-5) PARAMETER Capture Range on CLKIN Lock Range on CLKIN CLKIN Duty Cycle SYNCIN Setup to CLKIN Rising SYNCIN Hold After CLKIN Rising SYNCIN Pulse Width CLKOUT1 Delay from CLKIN Rising CLKOUT1 Duty Cycle SYNCOUT Delay from CLKOUT2 SYNCOUT Pulse Width CLKOUT1 Delay from CLKOUT2 Rising Rise/Fall Time on CLKIN, SYNCIN (Note 3) Rise/Fall Time on CLKOUT, SYNCOUT, CLKOUT2 (Note 4) tSU tHI tPW tD CD tDF tSPW tDH tRF tRF 3.3V 5V 3.3V 5V -15 0 3.3V 5V SYMBOL CONDITIONS (Note 3) (Note 3) (Note 3) MIN 10,000 10,000 35 46 30 76 -15 -15 49 -5 0 0 65 TYP MAX UNITS ppm ppm % ns ns ns ns % ns ns ns ns ns
CLKIN period +15 +31 51 30 CLKOUT 1 period +15 60 40 60 40
Note 3: Guaranteed by design. Note 4: 100pF load on CLKOUT, SYNCOUT, CLKOUT.
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DS21610 3.3V/5V Clock Rate Adapter
Figure 4-1. SYNCIN/CLKIN to CLKOUT1/SYNCOUT and CLKOUT2
CLKIN SINCIN tSU CLKOUT1 tPW tD tHI
CLKOUT1 SYNCOUT tDF tWO tDF
CLKOUT2 CLKOUT1 tDH tDH
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DS21610 3.3V/5V Clock Rate Adapter
Figure 4-2. Output Frame-Sync Alignment When CLKOIT2 = 2 x CLKOUT1
CLKOUT1 (4.096MHz) CLKOUT2 (8.192MHz) SYNCOUT
CLKOUT1 (3.088MHz) CLKOUT2 (6.176MHz) SYNCOUT
Figure 4-3. Output Frame-Sync Alignment When CLKOUT2 = 3 x CLKOUT1
CLKOUT1 (2.56MHz or 2.048MHz) CLKOUT2 (7.680MHz or 6.144MHz) SYNCOUT
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DS21610 3.3V/5V Clock Rate Adapter
Figure 4-4. Output Frame-Sync Alignment When CLKOIT2 = 4 x CLKOUT1
CLKOUT1 (1.544MHz or 2.048MHz) CLKOUT2 (6.176MHz or 8.192MHz) SYNCOUT (short) SYNCOUT (long)
Figure 4-5. Output Frame-Sync Alignment When CLKOUT2 = 5 x CLKOUT1
CLKOUT1 (1.544MHz) CLKOUT2 (7.720MHz) SYNCOUT
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DS21610 3.3V/5V Clock Rate Adapter
5. PACKAGE INFORMATION
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/DallasPackInfo.)
16-Pin SO, 0.300" Body
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DS21610 3.3V/5V Clock Rate Adapter 28-PIN PLCC
LTR A A1 A2 B B1 C D D1 D2 E E1 E2 L1 N E1 Ch1
MIN 0.165 0.090 0.02 0.026 0.013 0.009 0.485 0.450 0.390 0.485 0.450 0.390 0.060 28 0.050 0.042
MAX 0.180 0.120 -- 0.033 0.021 0.012 0.495 0.456 0.430 0.495 0.456 0.430 -- -- BSC 0.048
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DS21610 3.3V/5V Clock Rate Adapter
6. REVISION HISTORY
REVISION 090100 112700 120600 021501 060601 082001 032002 032803 113004 DESCRIPTION Preliminary release Remove references to 3V operation Add FSP pin to block diagram Add mechanical drawings for PLCC package Added jitter specifications and pinout for all packages Added timing diagrams Updated jitter specifications Added 3.3V operation specifications Added soldering temperature to Absolute Maximum Ratings section
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