m74hc590 STMicroelectronics, m74hc590 Datasheet - Page 2

• Manufacturer Part Number: m74hc590
• Description: 8 Binary Counter Register With 3 State Output
• Manufacturer: STMicroelectronics

M74HC590
INPUT AND OUTPUT EQUIVALENT CIRCUIT
TRUTH TABLE
X: Don’t Care
RCO = QA’·QB’·QC’·QD’·QE’·QF’·QG’·QH’ (QA’ to QH’ : INTERNAL OUTPUTS OF THE COUNTER)
LOGIC DIAGRAM
2/15
G
H
X
X
X
X
X
X
L
RCK
X
X
X
X
X
X
INPUTS
CCLR
H
H
H
X
X
X
X
L
CCKEN
H
X
X
X
X
X
L
L
CCK
X
X
X
X
X
X
PIN DESCRIPTION
1, 2, 3, 4, 5,
PIN No
6, 7, 15
COUNTER DATA IS STORED INTO REGISTER
11
12
13
14
10
16
9
8
REGISTER STAGE IS NOT CHANGED
ADVANCE ONE COUNT
SYMBOL
QA to QH
Q OUTPUTS DISABLE
Q OUTPUTS ENABLE
CCKEN
CCLR
RCO
GND
CCK
RCK
COUNTER CLEAR
V
G
CC
NO COUNT
NO COUNT
OUTPUT
Outputs
Counter Clock Input
Counter Clock Enable
Input
Register Clock Input
Ripple Carry Output
Output Enable Input
Counter Clear Input
Ground (0V)
Positive Supply Voltage
NAME AND FUNCTION