Philips Semiconductors Product specification
74F161A, 74F163A4-bit binary counters
2000 Jun 30
5
74F163A MODE SELECT – FUNCTION TABLE
INPUTS OUTPUTS
SR CP CEP CET PE Dn Qn TC
l ↑ X X X X L L Reset (clear)
h ↑ X X l l L L
h ↑ X X l h H (2)
h ↑ h h h X count (2) Count
h X l X h X q
n
(2)
h X X l h X q
n
L
H = High voltage level
h = High voltage level one setup prior to the Low-to-High clock transition
L = Low voltage level
l = Low voltage level one setup prior to the Low-to-High clock transition
q
n
= Lower case letters indicate the state of the referenced output prior to the Low-to-High clock transition
X = Don’t care
↑ = Low-to-High clock transition
(1) = The TC output is High when CET is High and the counter is at Terminal Count (HHHH for 74F161A)
(2) = The TC output is High when CET is High and the counter is at Terminal Count (HHHH for 74F163A)
74F161A LOGIC DIAGRAM
R
D
CP
Q
Q
R
D
CP
Q
Q
R
D
CP
Q
Q
R
D
CP
Q
Q
14
Q0
13
Q1
12
Q2
11
Q3
15
TC
6
D3
5
D2
4
D1
3
D0
7
CEP
10
CET
9
PE
1
MR
2
CP
SF00662
V
CC
= Pin 16
GND = Pin 8
