74HC297 Datasheet, PDF (4/12 Pages) NXP Semiconductors – Digital phase-locked-loop filter

Philips Semiconductors
Digital phase-locked-loop filter
Product specification
74HC/HCT297
PIN DESCRIPTION
PIN NO.
2, 1, 15, 14
3
4
5
6
7
8
9, 10, 13
11
12
16
SYMBOL
A, B, C, D
EN_CTR
K_CP
I/D_CP
D/U
I/D_OUT
GND
φA₁, φB, φA₂
XORPD_OUT
ECPD_OUT
V_CC
NAME AND FUNCTION
modulo control inputs
K-counter enable input
K-counter clock input (LOW-to-HIGH, edge-triggered)
increment/decrement clock input (HIGH-to-LOW, edge-triggered)
down/up control
increment/decrement bus output
ground (0 V)
phase inputs
EXCLUSIVE-OR phase detector output
edge-controlled phase detector output
positive supply voltage
Fig.1 Pin configuration.
Fig.2 Logic symbol.
Fig.3 IEC logic symbol.
September 1993
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