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CD74ACT297M Datasheet(PDF) 9 Page - Texas Instruments |
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CD74ACT297M Datasheet(HTML) 9 Page - Texas Instruments |
9 / 12 page CD74ACT297 DIGITAL PHASE-LOCKED LOOP SCHS297A – AUGUST 1998 – REVISED SEPTEMBER 1999 9 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 φB 92CS-40451 φA1 XORPD OUT Figure 6. Exclusive-OR Phase-Detector Waveforms tTHL tPHL 1/F max I/D CLK tPHL I/D OUT tTLH 50% VCC tw 1.5 V 92CS-40452 1.5 V 50% VCC 10% 90% 3 V 0 V VOL ≈VCC Figure 7. Waveforms Showing Clock (ID CLK) to Output (ID OUT) Propagation Delays, Clock Pulse Duration, and Maximum Clock Pulse Frequency tPLH 92CS-43151 tPHL tPLH tPHL φB φA1 XORPD OUT 50% VCC 1.5 V 50% VCC 50% VCC 50% VCC 1.5 V 1.5 V 1.5 V 3 V 0 V 3 V 0 V VOL ≈VCC Figure 8. Waveforms Showing Phase Input ( φB, φA2) to Output (XORPD OUT) Propagation Delays |
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