5V TTL-TO-DIFFERENTIAL PECL AND DIFFERENTIAL PECL-TO-TTL TRANSLATOR FEATURES SY10ELT28 SY100ELT28 FINAL DESCRIPTION ■ 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 ■ Wide temperature range: –40°C to +85°C ■ 5V power supply ■ QTTL output will default low with inputs left open or < 1.3V ■ QECL output will default high with inputs left open ■ Internal PECL input pulldown resistors ■ Available in 8-pin MSOP and SOIC packages 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 NAMES PIN CONFIGURATION/BLOCK DIAGRAM Pin Function DECL 1 8 VCC DTTL /DECL 2 7 QTTL QTTL TTL Outputs DECL, /DECL PECL Differential Inputs QECL, /QECL PECL Differential Outputs VCC Positive Supply GND Ground PECL TTL QECL 3 6 DTTL /QECL 4 5 GND TOP VIEW (Available in MSOP or SOIC package) TTL Inputs Rev.: B 1 Amendment: /0 Issue Date: February 2003 SY10ELT28 SY100ELT28 Micrel ABSOLUTE MAXIMUM RATINGS(1) Symbol Rating Value Unit –0.5 to +7.0 V 0 to +6.0 V 50 100 mA VCC Power Supply Voltage VIN Input Voltage IOUT PECL Output Current TA Operating Temperature Range –40 to +85 °C Tstore Storage Temperature Range –65 to +150 °C θJA Package Thermal Resistance (Junction-to-Ambient) –Still-Air (SOIC) –500lfpm (SOIC) 160 109 °C/W –Still-Air (MSOP) –500lfpm (MSOP) 206 155 °C/W (SOIC) (MSOP) 39 39 °C/W θJC –Continuous –Surge Package Thermal Resistance (Junction-to-Case) 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 = –40°C Symbol Parameter TA = +25°C TA = +85°C Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Unit VCC Power Supply Voltage 4.75 5.0 5.5 4.75 5.0 5.5 4.75 5.0 5.5 V ICC Power Supply Current — 23 40 — 22 40 — 25 40 mA CIN Input Capacitance — — — — — — — — 0.75 1.1 — — — — — — — — pF pF (SOIC) (MSOP) 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 = –40°C Symbol Parameter TA = +25°C TA = +85°C Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Unit Condition VOH Output HIGH Voltage 3920 4010 4110 4020 4105 4190 4090 4185 4280 mV 50Ω VCC–2V VOL Output LOW Voltage 3050 3200 3350 3050 3210 3370 3050 3227 3405 mV 50Ω VCC–2V VIH Input HIGH Voltage (Single-Ended) 3770 — 4110 3870 — 4190 3940 — 4280 mV VIL Input LOW Voltage (Single-Ended) 3050 — 3500 3050 — 3520 3050 — 3555 mV VIHCMR Input HIGH Voltage Common Mode Range(2) 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. 2 SY10ELT28 SY100ELT28 Micrel 100K PECL DC ELECTRICAL CHARACTERISTICS(1) VCC = +5.0V ±10% TA = –40°C Symbol Parameter TA = +25°C TA = +85°C Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Unit Condition VOH Output HIGH Voltage 3915 3995 4120 3975 4045 4120 3975 4050 4120 mV 50Ω VCC–2V VOL Output LOW Voltage 3170 3305 3445 3190 3295 3380 3190 3295 3380 mV 50Ω VCC–2V VIH Input HIGH Voltage (Single-Ended) 3835 — 4120 3835 — 4120 3835 — 4120 mV VIL Input LOW Voltage (Single-Ended) 3190 — 3525 3190 — 3525 3190 — 3525 mV VIHCMR Input HIGH Voltage Common Mode Range(2) 2.2 — VCC 2.2 — VCC 2.2 — VCC V 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 = –40°C Symbol Parameter TA = +25°C TA = +85°C Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Unit Condition IIH Input HIGH Current — — 10 — 20 100 — — — — 20 100 — — — — 20 100 µA µA VIN = 2.7V VIN = VCC IIL Input LOW Current — — –600 — — –600 — — –600 µA VIN = 0.5V VIH Input HIGH Voltage 2.0 — — 2.0 — — 2.0 — — V VIL Input LOW Voltage — — 0.8 — — 0.8 — — 0.8 V VIK Input Clamp Diode Voltage — — –1.2 — — –1.2 — — –1.2 V IIK = –18mA VOH Output HIGH Voltage 2.4 2.9 — 2.4 3.4 — 2.4 3.9 — V IOH = –3.0mA VOL Output LOW Voltage — 0.29 0.5 — 0.26 0.5 — 0.27 0.5 V IOL = 24mA IOSC Output Short-Circuit Current –175 — –60 –175 — –60 –175 — –60 µA VO = 0V 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. 3 SY10ELT28 SY100ELT28 Micrel AC ELECTRICAL CHARACTERISTICS VCC = +5.0V ±10% TA = –40°C Symbol Parameter TA = +25°C TA = +85°C Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Unit PECL TTL 700 160 — — — — 700 160 — — — — 700 160 — — — — MHz MHz Condition fMAX MaximumFrequency(1) tPLH Propagation Delay DEC L ➝ QTTL 1.5 — 5.5 1.5 — 5.5 1.5 — 5.5 ns CL = 20pF DTTL ➝ QECL 0.2 — 1.2 0.2 1.2 1.5 0.2 — 1.35 ns 50Ω toVCC–2V Propagation DEC L ➝ QTTL 1.5 — 5.5 1.5 — 5.5 1.5 — 5.5 ns CL = 20pF Delay DTTL ➝ QECL 0.2 — 1.2 0.2 1.2 1.5 0.2 — 1.35 ns 50Ω toVCC–2V tPHL VoltageSwing(2) VPP PECL Input (Single-Ended)(3) 200 800 1000 200 800 1000 200 800 1000 mV tr tf QECL Output Rise/Fall Times (20% to 80%) 0.15 — 1.5 0.15 0.3 1.5 0.15 — 1.5 ns — 1.0 — — 0.80 — — 0.7 — ns QTTL Output Rise/Fall Times (10% to 90%) TTL 50Ω to VCC –2V CL = 20pF; TTL Output 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 Operating Range Marking Code SY10ELT28KI(1) K8-1 Industrial XL28 XL28 SY10ELT28KITR*(1) K8-1 Industrial XL28 XL28 SY100ELT28KI(1) K8-1 Industrial XL28 XL28 SY100ELT28KITR*(1) K8-1 Industrial XL28 XEL28 SY10ELT28ZI(1) Z8-1 Industrial XEL28 XEL28 SY10ELT28ZITR*(1) Z8-1 Industrial XEL28 XEL28 SY100ELT28ZI(1) Z8-1 Industrial XEL28 XEL28 SY100ELT28ZITR*(1) Z8-1 Industrial XEL28 Package Type Operating Range Marking Code K8-1 Commercial XL28 K8-1 K8-1 K8-1 Z8-1 Z8-1 Z8-1 Z8-1 Commercial Commercial Commercial Commercial Commercial Commercial Commercial Ordering Code *Tape and Reel Note 1. Recommended for new designs. 4 SY10ELT28 SY100ELT28 Micrel TERMINATION RECOMMENDATIONS +5.0V +5.0V ZO = 50Ω R1 82Ω R1 82Ω +5.0V R2 130Ω R2 130Ω Vt = VCC —2V ZO = 50Ω Figure 1. +5V PECL Parallel Termination–Thevenin Equivalent +5.0V +5.0V Z = 50Ω Z = 50Ω 50Ω 50Ω source destination Rb 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 110Ω. 5 SY10ELT28 SY100ELT28 Micrel 8 LEAD MSOP (K8-1) Rev. 01 6 SY10ELT28 SY100ELT28 Micrel 8 LEAD SOIC .150" WIDE (Z8-1) Rev. 03 MICREL, INC. TEL 1849 FORTUNE DRIVE SAN JOSE, CA 95131 + 1 (408) 944-0800 FAX + 1 (408) 944-0970 WEB USA 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. © 2003 Micrel, Incorporated. 7