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CD74ACT297M Datasheet(PDF) 4 Page - Texas Instruments |
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CD74ACT297M Datasheet(HTML) 4 Page - Texas Instruments |
4 / 12 page CD74ACT297 DIGITAL PHASE-LOCKED LOOP SCHS297A – AUGUST 1998 – REVISED SEPTEMBER 1999 4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 functional block diagram D/U To Mode Controls 12–2 (11 stages not shown) 21 15 14 4 63 5 9 10 13 7 8 9 10 11 12 13 14 0 1 2 4 8 2 1 A B C D 4 6 3 5 K CLK ENCTR I/D CLK I/D OUT POWER-UP RESET l = 1 C20 20D XORPD OUT ECPD OUT R 14D 14T M14 13D M13 1T Increment R R R R R TT T 1T T 13T 13T 20D C20 T T 14D 14T M13 13D RR R R M14 R R I/D Circuit Decrement 7 11 12 R R SS C21 C21 C21 C21 C21 C21 C21 C21 C21 21D 21D 21D 21D 21D 21D 21D 21D Exclusive-OR Phase Detector Edge-Controlled Phase Detector φA1 φB φA2 1 X/Y K Counter 21J 21K |
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