N74ALS161BN データシートの表示（PDF） - Philips Electronics
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N74ALS161BN Datasheet PDF : 14 Pages
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Philips Semiconductors
4-bit binary counter
Product specification
74ALS161B/74ALS163B
LOGIC DIAGRAM – 74ALS161B
2
CP
1
MR
9
PE
10
CET
7
CEP
3
D0
D RQ
CP Q
14
Q0
4
D1
D RQ
CP Q
13
Q1
5
D2
D RQ
CP Q
12
Q2
6
D3
D RQ
CP Q
11
Q3
VCC = Pin 16
GND = Pin 8
15
TC
SF00662
MODE SELECTION FUNCTION TABLE – 74ALS161B
INPUTS
MR
CP
CEP CET
PE
Dn
OUTPUTS
Qn
TC
OPERATING MODE
L
X
X
X
X
X
L
L
Reset (clear)
H
↑
X
X
l
l
L
H
↑
X
X
l
h
H
L
Parallel load
(a)
H
↑
h
h
h
X
count
(a)
Count
h
X
l
X
h
X
qn
h
X
X
l
h
X
qn
(a)
Hold (do nothing)
L
H=
h=
L=
l=
qn =
X=
(a) =
↑=
High-voltage level
High state must be present one setup time before the Low-to-High clock transition
Low-voltage level
Low state must be present one setup time before the Low-to-High clock transition
Lower case letters indicate the state of the referenced output prior to the Low-to-High clock transition
Don’t care
The output is High when CET is High and the counter is at terminal count (HHHH)
Low-to-High clock transition
1991 Feb 08
5
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