Precision Edge® SY89872U Micrel, Inc. LVDS OUTPUTS DC ELECTRICAL CHARACTERISTICS(Note 1, 2) VCC = 2.5V ±5%; TA = –40°C to +85°C; Unless otherwise stated. Symbol Parameter Condition Min Typ Max Units VOUT Output Voltage Swing Note 5 250 350 450 mV VOH Output High Voltage Note 3 1.475 V VOL Output Low Voltage Note 3 0.925 VOCM Output Common Mode Voltage Note 4 1.125 1.375 V 'VOCM Change in Common Mode Voltage –50 50 mV Note 1. Note 2. Note 3. Note 4. Note 5. V The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established. Specification for packaged product only. Measured as per Figure 1a, 100ý across Q and /Q outputs. Measured as per Figure 1b. See Figure 1c. LVTTL/CMOS INPUTS DC ELECTRICAL CHARACTERISTICS(Note 1, 2) VCC = 2.5V ±5%; TA = –40°C to +85°C; Unless otherwise stated. Symbol Parameter VIH Min Typ Max Units Input HIGH Voltage 2.0 – VCC V VIL Input LOW Voltage 0 – 0.8 V IIH Input HIGH Current –125 – 20 μA IIL Input LOW Current – – –300 μA Note 1. Note 2. Condition The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established. Specification for packaged product only. M9999-082407 [email protected] or (408) 955-1690 4 Precision Edge® SY89872U Micrel, Inc. LVDS OUTPUT 50Ω VOUT VOH, VOL 100Ω 50Ω VOCM, ΔVOCM VOH, VOL GND GND Figure 1a. LVDS Differential Measurement Figure 1b. LVDS Common Mode Measurement DEFINITION OF SINGLE-ENDED AND DIFFERENTIAL SWING VIN, VOUT VDIFF_IN, VDIFF_OUT 350mV (typical) 700mV (typical) Figure 1d. Differential Swing Figure 1c. Single-Ended Swing TIMING DIAGRAM VCC/2 /RESET tRR IN /IN VIN Swing tPD /QB VOUT Swing QB QA /QA M9999-082407 [email protected] or (408) 955-1690 6 Precision Edge® SY89872U Micrel, Inc. TYPICAL OPERATING CHARACTERISTICS VCC = 2.5V, VIN = 400mV, TA = 25°C, unless otherwise stated. 0 3500 3000 2500 2000 1500 1000 500 500 0 0 600 IN to Q Propagation Delay vs. Temperature 575 550 525 500 -40 -20 0 20 40 60 80 100 TEMPERATURE (°C) INPUT SWING (mV) FREQUENCY (MHz) QA @622MHz and QB @155.5MHz (Divide-by-4) QA 1400 50 550 1200 100 1000 150 600 800 200 650 600 250 400 300 200 QA AMPLITUDE (mV) 350 IN to Q Propagation Delay vs. Input Swing PROPAGATION DELAY (ps) 700 PROPAGATION DELAY (ps) 400 QA Output Amplitude vs. Frequency 1.25GHz Output 622MHz Output /QA QB0 Output Swing (50mV/div.) Output Swing (100mV/div.) /Q 155.5MHz Output Q /QB0 TIME (150ps/div.) TIME (1ns/div.) 2GHz Output Output Swing (50mV/div.) /Q Q TIME (100ps/div.) M9999-082407 [email protected] or (408) 955-1690 7 Precision Edge® SY89872U Micrel, Inc. INPUT BUFFER STRUCTURE VCC 1.86kΩ VCC 1.86kΩ 1.86kΩ 25kΩ R S0 S1 /RESET 1.86kΩ R IN 50Ω VT 50Ω GND GND /IN Figure 2a. Simplified Differential Input Buffer M9999-082407 [email protected] or (408) 955-1690 Figure 2b. Simplified TTL/CMOS Input Buffer 8