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5V TTL-TO-DIFFERENTIAL PECL AND DIFFERENTIAL PECL-TO-TTL TRANSLATOR
FEATURES
s Guaranteed AC parameters over temperature: * fMAX > 160MHz (TTL) * < 5.5ns PECL-to-TTL propagation delay * < 1.5ns tr / tf; PECL output * < 1.3ns TTL-to-PECL propagation delay s Wide temperature range: -40C to +85C s 5V power supply s QTTL output will default low with inputs left open or < 1.3V s QECL output will default high with inputs left open s Internal PECL input pulldown resistors s Available in 8-pin MSOP and SOIC packages
SY10ELT28 SY100ELT28 FINAL
DESCRIPTION
The SY10/100ELT28 is a differential PECL-to-TTL translator and a TTL-to-differential PECL translator in a single package. Because PECL (Positive ECL) levels are used, only +5V and ground are required. The small outline 8-pin package and the dual translation design of the ELT28 makes it ideal for applications which are sending and receiving signals across a backplane.
PIN CONFIGURATION/BLOCK DIAGRAM
PIN NAMES
Pin Function TTL Inputs TTL Outputs PECL Differential Inputs PECL Differential Outputs Positive Supply Ground
DECL 1 /DECL 2
PECL TTL
8 VCC 7 QTTL 6 DTTL 5 GND
DTTL QTTL DECL, /DECL QECL, /QECL VCC GND
QECL 3 /QECL 4
TOP VIEW (Available in MSOP or SOIC package)
Rev.: B
Amendment: /0
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Issue Date: February 2003
Micrel
SY10ELT28 SY100ELT28
ABSOLUTE MAXIMUM RATINGS(1)
Symbol VCC VIN IOUT TA Tstore JA Power Supply Voltage Input Voltage PECL Output Current Operating Temperature Range Storage Temperature Range Package Thermal Resistance (Junction-to-Ambient) -Still-Air (SOIC) -500lfpm (SOIC) -Still-Air (MSOP) -500lfpm (MSOP) JC Package Thermal Resistance (Junction-to-Case) (SOIC) (MSOP) -Continuous -Surge Rating Value -0.5 to +7.0 0 to +6.0 50 100 -40 to +85 -65 to +150 160 109 206 155 39 39 Unit V V mA C C C/W C/W C/W
NOTE: 1. Permanent device damage may occur if ABSOLUTE MAXIMUM RATINGS are exceeded. This is a stress rating only and functional operation is not implied at conditions other than those detailed in the operational sections of this data sheet. Exposure to ABSOLUTE MAXIMUM RATlNG conditions for extended periods may affect device reliability.
DC ELECTRICAL CHARACTERISTICS(1)
VCC = +5V 10%; VEE = 0V
TA = -40C Symbol VCC ICC CIN Parameter Power Supply Voltage Power Supply Current Input Capacitance (SOIC) (MSOP) Min. 4.75 -- -- -- Typ. 5.0 23 -- -- Max. 5.5 40 -- -- Min. 4.75 -- -- -- TA = +25C Typ. 5.0 22 0.75 1.1 Max. 5.5 40 -- -- Min. 4.75 -- -- -- TA = +85C Typ. 5.0 25 -- -- Max. 5.5 40 -- -- Unit V mA pF pF Condition
NOTE: 1. 10/100KELT circuits are designed to meet the DC specifications shown in the above table after thermal equilibrium has been established. The circuit is in a test socket or mounted on a printed circuit board and traverse airflow greater than 500lfpm is maintained. Input and output parameters vary 1:1 with VCC. VCC can vary 0.25V.
10K PECL DC ELECTRICAL CHARACTERISTICS(1)
VCC = +5.0V 10%
TA = -40C Symbol VOH VOL VIH VIL VIHCMR Parameter Output HIGH Voltage Output LOW Voltage Input HIGH Voltage (Single-Ended) Input LOW Voltage (Single-Ended) Input HIGH Voltage Common Mode Range(2) Min. 3920 3050 3770 3050 Typ. 4010 3200 -- -- Max. 4110 3350 4110 3500 Min. 4020 3050 3870 3050 TA = +25C Typ. 4105 3210 -- -- Max. 4190 3370 4190 3520 Min. 4090 3050 3940 3050 TA = +85C Typ. 4185 3227 -- -- Max. 4280 3405 4280 3555 Unit mV mV mV mV Condition
50 VCC-2V 50 VCC-2V
1.2
--
VCC
1.2
--
VCC
1.2
--
VCC
mV
NOTES: 1. 10/100KELT circuits are designed to meet the DC specifications shown in the above table after thermal equilibrium has been established. The circuit is in a test socket or mounted on a printed circuit board and traverse airflow greater than 500lfpm is maintained. 2. VIHCMR (Min) varies 1:1 with GND, VIHCMR (Max) varies 1:1 with VCC.
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Micrel
SY10ELT28 SY100ELT28
100K PECL DC ELECTRICAL CHARACTERISTICS(1)
VCC = +5.0V 10%
TA = -40C Symbol VOH VOL VIH VIL VIHCMR Parameter Output HIGH Voltage Output LOW Voltage Input HIGH Voltage (Single-Ended) Input LOW Voltage (Single-Ended) Input HIGH Voltage Common Mode Range(2) Min. 3915 3170 3835 3190 2.2 Typ. 3995 3305 -- -- -- Max. 4120 3445 4120 3525 VCC Min. 3975 3190 3835 3190 2.2 TA = +25C Typ. 4045 3295 -- -- -- Max. 4120 3380 4120 3525 VCC Min. 3975 3190 3835 3190 2.2 TA = +85C Typ. 4050 3295 -- -- -- Max. 4120 3380 4120 3525 VCC Unit mV mV mV mV V Condition
50 VCC-2V 50 VCC-2V
NOTES: 1. 10/100KELT circuits are designed to meet the DC specifications shown in the above table after thermal equilibrium has been established. The circuit is in a test socket or mounted on a printed circuit board and traverse airflow greater than 500lfpm is maintained. 2. VIHCMR (Min) varies 1:1 with GND, VIHCMR (Max) varies 1:1 with VCC.
TTL DC ELECTRICAL CHARACTERISTICS(1)
VCC = +5.0V 10%
TA = -40C Symbol IIH IIL VIH VIL VIK VOH VOL IOSC Parameter Input HIGH Current Input LOW Current Input HIGH Voltage Input LOW Voltage Input Clamp Diode Voltage Output HIGH Voltage Output LOW Voltage Output Short-Circuit Current Min. -- -- -- 2.0 -- -- 2.4 -- -175 Typ. 10 -- -- -- -- -- 2.9 0.29 -- Max. 20 100 -600 -- 0.8 -1.2 -- 0.5 -60 Min. -- -- -- 2.0 -- -- 2.4 -- -175 TA = +25C Typ. -- -- -- -- -- -- 3.4 0.26 -- Max. 20 100 -600 -- 0.8 -1.2 -- 0.5 -60 Min. -- -- -- 2.0 -- -- 2.4 -- -175 TA = +85C Typ. -- -- -- -- -- -- 3.9 0.27 -- Max. 20 100 -600 -- 0.8 -1.2 -- 0.5 -60 Unit A A A V V V V V A
IIK = -18mA IOH = -3.0mA IOL = 24mA VO = 0V
Condition
VIN = 2.7V VIN = VCC VIN = 0.5V
NOTES: 1. 10/100KELT circuits are designed to meet the DC specifications shown in the above table after thermal equilibrium has been established. The circuit is in a test socket or mounted on a printed circuit board and traverse airflow greater than 500lfpm is maintained.
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Micrel
SY10ELT28 SY100ELT28
AC ELECTRICAL CHARACTERISTICS
VCC = +5.0V 10%
TA = -40C Symbol fMAX tPLH tPHL VPP tr tf Parameter MaximumFrequency(1) Propagation Delay Propagation Delay PECL TTL Min. 700 160 1.5 0.2 1.5 0.2 200 0.15 Typ. -- -- -- -- -- -- 800 -- Max. -- -- 5.5 1.2 5.5 1.2 1000 1.5 Min. 700 160 1.5 0.2 1.5 0.2 200 0.15 TA = +25C Typ. -- -- -- 1.2 -- 1.2 800 0.3 Max. -- -- 5.5 1.5 5.5 1.5 1000 1.5 Min. 700 160 1.5 0.2 1.5 0.2 200 0.15 TA = +85C Typ. -- -- -- -- -- -- 800 -- Max. -- -- 5.5 1.35 5.5 1.35 1000 1.5 Unit MHz MHz ns ns ns ns mV ns 50 to VCC -2V CL = 20pF; TTL Output CL = 20pF
50 toVCC-2V
Condition
DEC L QTTL DTTL QECL DEC L QTTL DTTL QECL
CL = 20pF
50 toVCC-2V
PECL Input (Single-Ended)(3)
VoltageSwing(2)
QECL Output Rise/Fall Times (20% to 80%) QTTL Output Rise/Fall Times (10% to 90%) TTL
--
1.0
--
--
0.80
--
--
0.7
--
ns
NOTES: 1. fMAX is defined as the maximum toggle frequency. 2. VPP (Min) is the minimum input swing for which AC parameters are guaranteed. 3. See "Timing Waveform."
TIMING WAVEFORM
Q(0:9) 150mV to 1200mV /Q(0:9)
PRODUCT ORDERING CODE
Ordering Code SY10ELT28KC SY10ELT28KCTR* SY100ELT28KC SY100ELT28KCTR* SY10ELT28ZC SY10ELT28ZCTR* SY100ELT28ZC SY100ELT28ZCTR* Package Type K8-1 K8-1 K8-1 K8-1 Z8-1 Z8-1 Z8-1 Z8-1 Operating Range Commercial Commercial Commercial Commercial Commercial Commercial Commercial Commercial Marking Code XL28 XL28 XL28 XL28 XEL28 XEL28 XEL28 XEL28 Ordering Code SY10ELT28KI(1) SY10ELT28KITR*(1) SY100ELT28KI(1) SY100ELT28KITR*(1) SY10ELT28ZI(1) SY10ELT28ZITR*(1) SY100ELT28ZI(1) SY100ELT28ZITR*(1) Package Type K8-1 K8-1 K8-1 K8-1 Z8-1 Z8-1 Z8-1 Z8-1 Operating Range Industrial Industrial Industrial Industrial Industrial Industrial Industrial Industrial Marking Code XL28 XL28 XL28 XL28 XEL28 XEL28 XEL28 XEL28
*Tape and Reel Note 1. Recommended for new designs.
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Micrel
SY10ELT28 SY100ELT28
TERMINATION RECOMMENDATIONS
+5.0V
+5.0V
ZO = 50 ZO = 50
R1 82
R1 82
+5.0V
R2 130
R2 130
Vt = VCC --2V
Figure 1. +5V PECL Parallel Termination-Thevenin Equivalent
+5.0V
Z = 50 Z = 50 50 50
+5.0V
source
Rb
destination
Figure 2. +5V PECL Three-Resistor "Y-Termination" Notes: 1. Power-saving alternative to 4-resistor, Thevenin termination. 2. Place termination resistors as close to destination inputs as possible. 3. Rb resistor sets the DC bias voltage, equal to Vt. For 5.0V supply, Rb value is 110.
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Micrel
SY10ELT28 SY100ELT28
8 LEAD MSOP (K8-1)
Rev. 01
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Micrel
SY10ELT28 SY100ELT28
8 LEAD SOIC .150" WIDE (Z8-1)
Rev. 03
MICREL, INC.
TEL
1849 FORTUNE DRIVE SAN JOSE, CA 95131
FAX
USA
+ 1 (408) 944-0800
+ 1 (408) 944-0970
WEB
http://www.micrel.com
The information furnished by Micrel in this datasheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser's use or sale of Micrel Products for use in life support appliances, devices or systems is at Purchaser's own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. (c) 2003 Micrel, Incorporated.
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