CD54ACT163 Datasheet, PDF (2/10 Pages) Texas Instruments – CD54ACT161 CD74ACT161

CD54ACT163, CD74ACT163
4-BIT SYNCHRONOUS BINARY COUNTERS
SCHS300 – APRIL 2000
FUNCTION TABLE
CLR
L
CLK
↑
INPUTS
ENP ENT
X
X
LOAD
X
A,B,C,D
X
OUTPUTS
Qn
RCO
L
L
FUNCTION
Reset (clear)
h
↑
X
X
l
h
↑
X
X
l
l
L
L
Parallel load
h
H
Note 1
h
↑
h
h
h
X
Count Note 1 Count
h
X
l
X
h
h
X
X
l
h
X
qn
Note 1
Inhibit
X
qn
L
H = high level, L = low level, X = don’t care, h = high level one setup time prior to the CLK
low-to-high transition, l = low level one setup time prior to the CLK low-to-high transition, q = the
state of the referenced output prior to the CLK low-to-high transition, ↑ = CLK low-to-high
transition.
NOTE 1: The RCO output is high when ENT is high and the counter is at terminal count (HHHH).
logic symbol^†
1
CLR
9
LOAD
10
ENT
7
ENP
2
CLK
3
A
4
B
5
C
6
D
CTRDIV16
5CT=0
M1
M2
3CT=15
G3
G4
C5/2,3,4+
1,5D [1]
[2]
[4]
[8]
15
RCO
14
QA
13
QB
12
QC
11
QD
† _{This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.}
2
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