74HC4520PW Просмотр технического описания (PDF) - Philips Electronics
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74HC4520PW Datasheet PDF : 7 Pages
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Philips Semiconductors
Dual 4-bit synchronous binary counter
Product specification
74HC/HCT4520
Fig.4 Functional diagram.
FUNCTION TABLE
nCP0 nCP1 MR MODE
↑
H
L counter advances
L
↓
L counter advances
↓
X
L no change
X
↑
L no change
↑
L
L no change
H
↓
L no change
X
X
H Q0 to Q3 = LOW
Notes
1. H = HIGH voltage level
L = LOW voltage level
X = don’t care
↑ = LOW-to-HIGH clock transition
↓ = HIGH-to-LOW clock transition
Fig.5 Logic diagram (one counter).
December 1990
Fig.6 Timing diagram.
4
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