74AC163 Datasheet, PDF (2/12 Pages) STMicroelectronics – SYNCHRONOUS PRESETTABLE 4-BIT COUNTER

74AC163
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
1
2
3, 4, 5, 6
7
10
9
14, 13, 12,
11
10
8
16
SYMBOL NAME AND FUNCT ION
CLEAR Master Reset
CLOCK Clock Input (LOW-to-HIGH,
Edge- Triggered)
A, B, C, D Data Inputs
ENABLE P Count Enable Input
ENABLE T Count Enable Carry Input
LOAD Parallel Enable Input
QA to QD Flip-Flop Outpus
ENABLE T Count Enable Carry Input
GND Ground (0V)
V_CC
Positive Supply Voltage
TRUTH TABLE
INPUT S
OUTPUTS
CLR
LD
PE
TE
CK
QA
QB
QC
QD
L
X
X
X
L
L
L
L
H
L
X
X
A
B
C
D
H
H
X
L
NO CHANGE
H
H
L
X
NO CHANGE
H
H
H
H
COUNT UP
X
NOTE:
X
X
X
X:Don’t Care
A,B, C,D: Logic level of data input
CARRY=TE • QA • QB • QC • QD
NO CHANGE
LOGIC DIAGRAMS
FUNCTION
RESET TO ”0”
PRESET DATA
NO COUNT
NO COUNT
COUNT
NO COUNT
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