74HC401 Просмотр технического описания (PDF) - Philips Electronics
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74HC401 Datasheet PDF : 11 Pages
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Philips Semiconductors
8-bit synchronous BCD down counter
Product specification
74HC/HCT40102
Fig.4 Functional diagram.
FUNCTION TABLE
CONTROL INPUTS
PRESET MODE ACTION
MR
PL
PE
TE
H
H
H
H
inhibit counter
H
H
H
L
synchronous
count down
H
H
L
X
preset on next LOW-to HIGH clock transition
H
L
L
X
X
X
preset asynchronously
asynchronous
X
X
clear to maximum count
Notes
1. Clock connected to CP.
2. Synchronous operation: changes occur on the LOW-to-HIGH CP transition.
3. Jam inputs: MSD = P7, LSD = P0.
H = HIGH voltage level
L = LOW voltage level
X = don’t care
December 1990
4
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