3.3V TRIPLE LVPECL-to-ECL OR LVPECL-to-LVECL TRANSLATOR FEATURES DESCRIPTION The SY100EL91L is a triple LVPECL-to-ECL or LVPECL-to-LVECL translator. A VBB output is provided for interfacing with single ended PECL signals at the input. If a single ended input is to be used, the VBB output should be connected to the D input. The active signal would then drive the D input. When used, the VBB output should be bypassed to ground via a 0.01µF capacitor. The VBB output is designed to act as the switching reference for the EL91L under single ended input switching conditions. As a result this pin can only source/sink up to 0.5mA of current. To accomplish the level translation the EL91L requires three power rails. The VCC supply should be connected to the positive supply, and the V EE pin should be connected to the negative power supply. The GND pins as expected are connected to the system ground plane. Both VEE and VCC should be bypassed to ground via 0.01µF capacitors. Under open input conditions, the D input will be biased at VCC/2 and the D input will be pulled to GND. This condition will force the Q output to a LOW, ensuring stability. ■ 3.3V power supply ■ 620ps propagation delay ■ Fully differential design ■ Supports low voltage operation ■ Available in 20-pin SOIC package PIN CONFIGURATION/BLOCK DIAGRAM ECL PECL VCC 1 20 VCC Q0 D0 3 18 Q0 17 GND D1 5 16 Q1 D1 6 15 Q1 7 14 GND 13 Q2 12 Q2 11 VCC D2 9 VEE 10 ECL D2 8 PECL PECL_V BB ECL 19 PECL D0 2 PECL_V BB 4 SY100EL91L PIN NAMES Pin Function Dn PECL Inputs Qn ECL Outputs PECL_VBB PECL Reference Voltage Output SOIC TOP VIEW FUNCTION TABLE Vcc VEE LVPECL-to-ECL Function 3.3V –5.0V LVPECL-to-LVECL 3.3V –3.3V Rev.: F 1 Amendment: /2 Issue Date: November, 1999 SY100EL91L Micrel 3.3V LVPECL INPUT DC ELECTRICAL CHARACTERISTICS(1) TA = –40°C Symbol VCC TA = 0°C TA = +25°C TA = +85°C Parameter Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Unit Power Supply Voltage 3.8 3.0 — 3.8 3.0 3.3 3.8 3.0 — 3.8 V 3.0 — Input HIGH Voltage(2) 2.135 — 2.420 2.135 — 2.420 2.135 2.350 2.420 2.135 — 2.420 V VIL Input LOW Voltage(2) 1.490 — 1.825 1.490 — 1.825 1.490 — 1.825 V IIH Input HIGH Current — — 150 — — 150 — — 150 — — 150 µA IIL Input LOW Current Dn Dn 0.5 -600 — — — — 0.5 -600 — — — — 0.5 -600 — — — — 0.5 -600 — — — — µA VBB Output Reference(2) 1.920 — 2.040 1.920 — 2.040 1.920 — 2.040 1.920 — 2.040 V ICC Power Supply Current — — — 10 mA VIH 10 — — 10 NOTES: 1. Parametric values specified at: 3 volt Power Supply Range 100EL91L Series 2. These levels are for VCC = 3.3V. Level specifications will vary 1:1 with VCC. — — 1.825 1.490 6.0 10 — -3.0V to -3.8V. ECL/LVECL OUTPUT DC ELECTRICAL CHARACTERISTICS(1) TA = –40°C Symbol Parameter TA = 0°C TA = +25°C TA = +85°C Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Unit -4.2 -3.0 — — -5.5 -3.8 -4.2 -3.0 — — -5.5 -3.8 -4.2 -3.0 — — -5.5 -3.8 -4.2 -3.0 — — -5.5 -3.8 V -1025 -955 VEE Power Supply Voltage VOH Output HIGH Voltage -1085 — -880 -1025 — -880 -880 -1025 — -880 mV VOL Output LOW Voltage -1830 — -1555 -1810 — -1620 -1810 -1705 -1620 -1810 — -1620 mV IEE Power Supply Current — — — — 30 mA ECL LVECL NOTE: 1. Parametric values specified at: 28 3 volt Power Supply Range — — 28 100EL91L Series 2 — 22 -3.0V to -3.8V. 28 SY100EL91L Micrel AC ELECTRICAL CHARACTERISTICS(4) LVPECL: VCC = +3.0V to +3.8V, ECL: VEE = -4.2V to -5.5V, LVECL: VEE = -3.0V to -3.8V TA = –40°C Symbol Parameter tPLH tPHL Propagation Delay D to Q tskew Within-Device Skew(1) Output-to-Output Part-to-Part (Diff.) Duty Cycle (Diff.) VPP VCMR tr tf Diff. S.E. Minimum Input Swing(2) TA = 0°C TA = +25°C TA = +85°C Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Unit 490 440 590 590 690 740 510 460 610 610 710 760 520 470 620 620 720 770 560 510 660 660 760 810 ps — — — 40 — 25 100 200 — — — — 40 — 25 100 200 — — — — 40 — 25 100 200 — — — — 40 — 25 100 200 — ps 150 — — 150 — — 150 — — 150 — — mV 1.3 1.5 — — VCC–0.2 — — VCC–0.2 — — VCC–0.2 1.2 1.4 — — VCC–0.2 VCC–0.2 1.2 1.4 VCC–0.2 VCC–0.2 1.2 1.4 320 400 580 320 400 580 320 400 580 320 400 580 Range(3) Common Mode VPP < 500mV VPP > 500mV Output Rise/Fall Times Q (20% to 80%) V VCC–0.2 ps NOTES: 1. Skew is measured between outputs under identical transitions. 2. Minimum input swing for which AC parameters are guaranteed. The device has a DC gain of ~40. 3. The CMR range is referenced to the most positive side of the differential input signal. Normal operation is obtained if the HIGH level falls within the specified range and the peak-to-peak voltage lies between VPP min. and 1V. 4. Parametric values specified at: 3 volt Power Supply Range 100EL91L Series -3.0V to -3.8V. PRODUCT ORDERING CODE Ordering Code 3 Package Type Operating Range SY100EL91LZC Z20-1 Commercial SY100EL91LZCTR Z20-1 Commercial SY100EL91L Micrel LVPECL-TO-ECL MODE CONFIGURATION VCC = +3.3V VCC = +3.3V VCC = 0V Q1 LVPECL_VBB 7 14 GND 13 Q2 D2 9 12 Q2 VEE 10 11 VCC ECL 0.1µF R4 83Ω R3 R2 R4 83Ω R3 R2 125Ω R1 R3 ECL D2 8 Unused VCC = +3.3V Input LVPECL VEE = 0V R2 15 R4 D1 6 83Ω Q1 Single Ended Mode 125Ω 16 D1 5 VEE = 0V LVPECL LVPECL DEVICE VCC = 0V R1 GND R3 17 LVPECL_VBB 4 R2 Q0 3 R4 18 D0 VCC = +3.3V 83Ω Q0 125Ω 19 D0 2 R1 VCC ECL 125Ω 20 VCC 1 LVPECL R1 VCC = +3.3V VEE = -3.3V ECL DEVICE VEE = -3.3V VEE = 0V VEE = -3.3V -3.3V 3.3V Configuration VCC = +3.3V VCC = +3.3V VCC = 0V Q1 LVPECL_VBB 7 14 GND 13 Q2 D2 9 12 Q2 VEE 10 11 VCC ECL 0.1µF R4 83Ω R3 R2 R4 R3 83Ω R2 125Ω R1 R3 ECL D2 8 Unused VCC = +3.3V Input LVPECL VEE = 0V R2 15 R4 D1 6 R1 Q1 Single Ended Mode 83Ω 16 D1 5 VEE = 0V LVPECL LVPECL DEVICE VCC = 0V R3 GND 125Ω 17 LVPECL_VBB 4 R2 Q0 3 R4 18 D0 VCC = +3.3V 83Ω Q0 125Ω 19 D0 2 R1 VCC ECL 125Ω 20 VCC 1 LVPECL R1 VCC = +3.3V VEE = -5V ECL DEVICE VEE = -5V VEE = 0V VEE = -5V -5V 5.0V Configuration NOTES: 1. The schematic above demonstrates three different ways that all or any inputs of SY100EL91L can be used. The three modes or operation are: Differential LVPECL, Single-Ended LVPECL, and/or Open. 2. If D2 an D2 are used in differential mode, then the same scheme of D0 and D0 applies. If used in single-ended mode, then use the same scheme of D1 and D1. 4 SY100EL91L Micrel 20 LEAD SOIC .300" WIDE (Z20-1) Rev. 03 MICREL-SYNERGY TEL 3250 SCOTT BOULEVARD SANTA CLARA CA 95054 USA + 1 (408) 980-9191 FAX + 1 (408) 914-7878 WEB 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. © 2000 Micrel Incorporated 5