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CD74ACT297M Datasheet(PDF) 9 Page - Texas Instruments |
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CD74ACT297M Datasheet(HTML) 9 Page - Texas Instruments |
9 / 18 page CD74ACT297 DIGITAL PHASE-LOCKED LOOP SCHS297D – AUGUST 1998 – REVISED JUNE 2002 9 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 tPLH 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. Phase Input ( φB, φA2) to Output (XORPD OUT) Propagation Delays φB φA2 ECPD OUT tPHL tPLH 3 V 0 V VOL ≈VCC 50% VCC 1.5 V 50% VCC 1.5 V 1.5 V 3 V 0 V Figure 9. Phase Input ( φB, φA2) to Output (ECPD OUT) Propagation Delays D/U ENCTR K CLK 1/fmax tsu tw tsu tH tH NOTE A: Shaded areas indicate when the input is permitted to change for predictable output performance. 3 V 0 V 1.5 V 1.5 V 1.5 V 1.5 V 1.5 V 1.5 V 1.5 V 3 V 0 V (See Note A) Figure 10. Clock (K CLK) Pulse Duration and Maximum Clock-Pulse Frequency, and Inputs (D/U, ENCTR) to Clock (K CLK) Setup and Hold Times |
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