CD74ACT297_14 Datasheet, PDF (3/18 Pages) Texas Instruments – DIGITAL PHASE-LOCKED LOOP

CD74ACT297
DIGITAL PHASE-LOCKED LOOP
Function Tables
SCHS297D – AUGUST 1998 – REVISED JUNE 2002
K COUNTER
(digital control)
D
C
B
A MODULO (K)
L
L
L
L
L
L
L
H
L
L
H
L
L
L
H
H
L
H
L
L
L
H
L
H
L
H
H
L
L
H
H
H
H
L
L
L
H
L
L
H
H
L
H
L
H
L
H
H
H
H
L
L
H
H
L
H
H
H
H
L
H
H
H
H
Inhibited
23
24
25
26
27
28
29
210
211
212
213
214
215
216
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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