CD74ACT297 Datasheet, PDF (3/12 Pages) Texas Instruments – DIGITAL PHASE-LOCKED LOOP

CD74ACT297
DIGITAL PHASE-LOCKED LOOP
Function Tables
SCHS297A – AUGUST 1998 – REVISED SEPTEMBER 1999
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
H or L
↓
H or L
↑
φB
↓
H or L
↑
H or L
ECPD OUT
H
L
No change
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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