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CD74ACT297 Datasheet(PDF) 3 Page - Texas Instruments |
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CD74ACT297 Datasheet(HTML) 3 Page - Texas Instruments |
3 / 18 page CD74ACT297 DIGITAL PHASE-LOCKED LOOP SCHS297D – AUGUST 1998 – REVISED JUNE 2002 3 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 Function Tables K COUNTER (digital control) D C B A MODULO (K) L L L L Inhibited L L L H 23 L L H L 24 L L H H 25 L H L L 26 L H L H 27 L H H L 28 L H H H 29 H L L L 210 H L L H 211 H L H L 212 H L H H 213 H H L L 214 H H L H 215 H H H L 216 H H H H 217 EXCLUSIVE-OR PHASE DETECTOR φA1 φB XORPD OUT L L L L H H H L H H H L EDGE-CONTROLLED PHASE DETECTOR φA2 φB ECPD OUT H or L ↓ H ↓ H or L L H or L ↑ No change ↑ H or L No change H = steady-state high level L = steady-state low level ↓ = transition from high to low ↑ = transition from low to high |
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