CD54ACT161 Datasheet, PDF (2/14 Pages) Texas Instruments – 4-BIT SYNCHRONOUS BINARY COUNTERS

CD54ACT161, CD74ACT161
4-BIT SYNCHRONOUS BINARY COUNTERS
SCHS298B – APRIL 2000 – REVISED MARCH 2003
FUNCTION TABLE
CLR
L
CLK
X
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, and ↑ = CLK low-to-high
transition.
NOTE 1: The RCO output is high when ENT is high and the counter is at terminal count
(HHHH).
2
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