M54HC190 ST Microelectronics, M54HC190 Datasheet - Page 2

• Manufacturer Part Number: M54HC190
• Description: 4 BIT SYNCHRONOUS UP/DOWN COUNTERS
• Manufacturer: ST Microelectronics

M54/M74HC190/191
INPUT AND OUTPUT EQUIVALENT CIRCUIT
IEC LOGIC SYMBOL (HC190)
TRUTH TABLE
X: Don’t Care
a - d: The level of steady state inputs at inputs a through D respectively
2/14
LOAD
H
H
H
H
L
ENABLE
X
H
X
L
L
INPUTS
D/U
X
H
X
X
L
CLOCK
X
QA
a
PIN DESCRIPTION
IEC LOGIC SYMBOL (HC191)
DOWN COUNT
15, 1, 10, 9
QB
NO CHANGE
NO CHANGE
3, 2, 6, 7
b
UP COUNT
PIN No
OUTPUS
11
12
13
14
16
4
5
8
QC
c
MA/MI OUT Terminal Count Output
QA to QD
DA to DD
SYMBOL
ENABLE
CLOCK
LOAD
GND
U/D
V
RC
CC
QD
d
NAME AND FUNCTION
Flip-Flop Outputs
Count Enable Input
(Active LOW)
Parallel Data Input
Load Input (Active LOW)
Ripple Clock Output
(Active LOW)
Cloack Input (LOW to
HIGH, Edge-triggered)
Data Inputs
Ground (0V)
Positive Supply Voltage
PRESET DATA
DOWN COUNT
NO COUNT
NO COUNT
UP COUNT
FUNCTION