MC74HC4538A
GND
C
X
1/R
X
1
RESET 1
A1
B1
Q1
Q1
GND
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
V
CC
GND
C
X
2/R
X
2
RESET 2
A2
B2
Q2
Q2
Reset
H
H
H
H
H
H
L
FUNCTION TABLE
Inputs
A
L
X
H
L,H,
L
X
X
L
X
H
L,H,
X
X
Not Triggered
Not Triggered
Not Triggered
Not Triggered
L
H
Not Triggered
B
H
Outputs
Q
Q
Figure 1. Pin Assignment
C
X
1
R
X
1
V
CC
1
TRIGGER
INPUTS
A1
B1
4
5
2
6
7
Q1
Q1
PIN 16 = V
CC
PIN 8 = GND
R
X
AND C
X
ARE EXTERNAL COMPONENTS
PIN 1 AND PIN 15 MUST BE HARD WIRED TO GND
RESET 1
3
C
X
2
R
X
2
V
CC
15 14
TRIGGER
INPUTS
A2
B2
12
11
10
9
Q2
Q2
RESET 2
13
Figure 2. Logic Diagram
ORDERING INFORMATION
Device
MC74HC4538AN
MC74HC4538ANG
MC74HC4538AD
MC74HC4538ADG
MC74HC4538ADR2
MC74HC4538ADR2G
MC74HC4538ADTR2
MC74HC4538ADTR2G
MC74HC4538AF
MC74HC4538AFG
MC74HC4538AFEL
MC74HC4538AFELG
Package
PDIP−16
PDIP−16
(Pb−Free)
SOIC−16
SOIC−16
(Pb−Free)
SOIC−16
SOIC−16
(Pb−Free)
TSSOP−16*
TSSOP−16*
SOEIAJ−16
SOEIAJ−16
(Pb−Free)
SOEIAJ−16
SOEIAJ−16
(Pb−Free)
Shipping
†
500 Units / Box
500 Units / Box
48 Units / Rail
48 Units / Rail
2500 Units / Reel
2500 Units / Reel
2500 Units / Reel
2500 Units / Reel
50 Units / Rail
50 Units / Rail
2000 Units / Reel
2000 Units / Reel
†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
*This package is inherently Pb−Free.
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