74HC161 Philips, 74HC161 Datasheet - Page 4

• Manufacturer Part Number: 74HC161
• Description: Presettable synchronous 4-bit binary counter asynchronous reset
• Manufacturer: Philips

Philips Semiconductors
FUNCTION TABLE
Note
1. The TC output is HIGH when CET is HIGH and the counter is at terminal count (HHHH).
December 1990
reset (clear)
parallel load
count
hold
(do nothing)
Presettable synchronous 4-bit binary
counter; asynchronous reset
H = HIGH voltage level
h = HIGH voltage level one set-up time prior to the LOW-to-HIGH CP transition
L = LOW voltage level
I = LOW voltage level one set-up time prior to the LOW-to-HIGH CP transition
q = lower case letters indicate the state of the referenced output one set-up time prior to the
X = don’t care
OPERATING MODE
= LOW-to-HIGH CP transition
LOW-to-HIGH CP transition
L
H
H
H
H
H
MR
X
X
X
Fig.4 Functional diagram.
CP
X
X
X
h
I
X
CEP
4
INPUTS
X
X
X
h
X
I
CET
X
I
I
h
h
h
PE
X
I
h
X
X
X
D
n
74HC/HCT161
Product specification
L
L
H
count
q
q
n
n
Q
OUTPUTS
n
L
L
(1)
(1)
(1)
L
TC