3V LVTTL-TO-DIFFERENTIAL LVPECL AND DIFFERENTIAL LVPECL-TO-LVTTL TRANSLATOR FEATURES SY10EPT28L SY100EPT28L DESCRIPTION ■ 3.3V ±10% power supply ■ Guaranteed AC parameters over temperature: fMAX > 275MHz (LVTTL) ■ < 2ns LVPECL-to-LVTTL propagation delay ■ < 600ps LVTTL-to-LVPECL propagation delay ■ Internal 75kΩ input pull-down resistors ■ Industrial temperature range: –40°C to +85°C ■ Available in 8-pin MSOP and SOIC packages The SY10/100EPT28L is a differential LVPECL-toLVTTL translator and a LVTTL-to-differential LVPECL translator in a single package. Because LVPECL (Positive ECL) levels are used, only +3.3V and ground are required. The small outline 8-pin package and the dual translation design of the EPT28L makes it ideal for applications which are sending and receiving signals across a backplane. The 100K series includes temperature compensation. Thus, logic levels are constant over temperature. PIN NAMES PIN CONFIGURATION/BLOCK DIAGRAM Pin Function 8 VCC D_LVTTL Low Voltage TTL Input 7 Q_LVTTL Q_LVTTL Low Voltage TTL Output Q_LVPECL 3 6 D_LVTTL D_LVPECL /D_LVPECL Low Voltage Differential PECL Inputs with 75kΩ internal pull-down /Q-LVPECL 4 5 GND Q_LVPECL /Q_LVPECL Low Voltage Differential PECL Outputs VCC 3.3V Positive Supply GND Ground D_LVPECL 1 /D_LVPECL 2 LVPECL LVTTL TOP VIEW (Available in MSOP or SOIC package) Rev.: A 1 Amendment: /0 Issue Date: August 2001 SY10EPT28L SY100EPT28L Micrel ABSOLUTE MAXIMUM RATINGS(1) Symbol Rating Value Unit –0.5 to +3.8 V 0 to VCC V 50 100 mV 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 VCC Power Supply Voltage VI Input Voltage IOUT LVPECL Output Current TA 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) 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 3.0 3.3 3.6 3.0 3.3 3.6 3.0 3.3 3.6 V ICC Power Supply Current — 20 40 — 22 40 — 25 40 mA Condition NOTE: 1. 10/100KEPT 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. LVPECL DC ELECTRICAL CHARACTERISTICS(1) VCC = 3.3V ±10% TA = –40°C Symbol Parameter TA = +25°C TA = +85°C Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Unit VOH HIGH(2) Output Voltage 10EPT 100EPT 2165 2155 2290 2280 2415 2405 2230 2155 2355 2280 2480 2405 2290 2155 2415 2280 2540 2405 mV VOL Output LOW(2) Voltage 10EPT 100EPT 1365 1355 1490 1480 1615 1605 1430 1355 1555 1480 1680 1605 1490 1355 1615 1480 1740 1605 mV VIH Input HIGH(2) Voltage 10EPT 100EPT 2090 2075 — — 2415 2420 2155 2075 — — 2480 2420 2215 2075 — — 2540 2420 mV VIL Input LOW(2) Voltage 10EPT 100EPT 1365 1355 — — 1690 1675 1430 1355 — — 1755 1675 1490 1355 — — 1815 1675 mV IIH Input HIGH Current IIL Input LOW Current CIN Input Capacitance — — 150 — — 150 — — 150 µA /D, D 0.5 — 0.5 — — 0.5 — — 0.5 µA (SOIC) (MSOP) — — — — — — — — 0.75 1.1 — — — — — — — — pF pF Condition VIN = 3.46V NOTES: 1. 10/100KEPT 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. Input and output parameters vary 1:1 with VCC. 2 SY10EPT28L SY100EPT28L Micrel LVTTL DC ELECTRICAL CHARACTERISTICS(1) VCC = 3.3V ±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 2.0 — — 2.0 — — 2.0 — — V IOH = –3mA VOL Output LOW Voltage — — 0.5 — — 0.5 — — 0.5 V IOH = –24mA 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 Voltage — — –1.2 — — –1.2 — — –1.2 V IIK = –18mA IIH Input HIGH Current — — 20 — — 20 — — 20 µA VIN = 2.7V — — 100 — — 100 — — 100 µA VIN = VCC — — –0.2 — — –0.2 — — –0.2 µA VIN = 0.5V –275 — –80 –275 — –80 –275 — –80 mA VOUT = 0V — — — — 0.75 1.1 — — — — — — pF pF IIL Input LOW Current IOUT(SC) LVTTL Output Short-Circuit Current CIN Input Capacitance (SOIC) (MSOP) — — NOTE: 1. 10/100KEPT 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. AC ELECTRICAL CHARACTERISTICS VCC = +3.3V ±10% TA = –40°C Symbol TA = +25°C TA = +85°C Parameter Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Unit Condition fMAX Maximum Frequency LVPECL LVTTL 700 275 — 350 — — 700 275 — 350 — — 700 275 — 350 — — MHz MHz Output Toggle Frequency tPLH tPHL Propagation Delay D_LVPECL ➝ Q_LVTTL 1.5 — 2.5 1.5 — 2.5 1.5 — 2.5 ns CL = 20pF Q_LVTTL ➝ D_LVPECL 100 400 600 100 400 600 100 400 600 ps 50Ω to VCC–2.0 VCMR LVPECL Common Mode Range 1.2 — VCC 1.2 — VCC 1.2 — VCC V VPP LVPECL Input Voltage Swing (Single-Ended)(1) 100 — — 100 — — 100 — — mV LVPECL Output Rise/Fall Times (20% to 80%) 200 — 500 200 — 500 200 — 500 ns 50Ω to VCC–2.0 LVTTL Output Rise/Fall Times (10% to 90%) 0.5 — 1.0 0.5 — 1.0 0.5 — 1.0 ns CL = 20pF tDC Duty Cycle 45 50 55 45 50 55 45 50 55 % tJITTER Cycle-to-Cycle Jitter (rms) — 0.2 <1 — 0.2 <1 — 0.2 <1 ps tr, tf NOTE: 1. VPP (Min) is the minimum input swing for which AC parameters are guaranteed. 3 RMS SY10EPT28L SY100EPT28L Micrel TERMINATION RECOMMENDATIONS +3.3V +3.3V ZO = 50Ω R1 130Ω R1 130Ω R2 82Ω R2 82Ω +3.3V ZO = 50Ω Vt = VCC —2V Figure 1. LVPECL Parallel Termination–Thevenin Equivalent +3.3V +3.3V Z = 50Ω Z = 50Ω 50Ω 50Ω source destination Rb Figure 2. LVPECL 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 3.3V supply, Rb value is between 46Ω to 50Ω. PRODUCT ORDERING CODE Ordering Code Package Type Operating Range Package Marking Ordering Code Package Type Operating Range Package Marking SY10EPT28LZI Z8-1 Industrial HEP28 SY10EPT28LKI K8-1 Industrial HP28 SY10EPT28LZITR* Z8-1 Industrial HEP28 SY10EPT28LKITR* K8-1 Industrial HP28 SY100EPT28LZI Z8-1 Industrial XEP28 SY100EPT28LKI K8-1 Industrial XP28 SY100EPT28LZITR* Z8-1 Industrial XEP28 SY100EPT28LKITR* K8-1 Industrial XP28 *Tape and Reel 4 SY10EPT28L SY100EPT28L Micrel 8 LEAD MSOP (K8-1) Rev. 01 5 SY10EPT28L SY100EPT28L Micrel 8 LEAD SOIC .150" WIDE (Z8-1) Rev. 03 MICREL-SYNERGY TEL 3250 SCOTT BOULEVARD + 1 (408) 980-9191 FAX SANTA CLARA + 1 (408) 914-7878 WEB CA 95054 USA http://www.micrel.com This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc. © 2001 Micrel Incorporated 6