MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Dual Precision
Monostable Multivibrator
(Retriggerable, Resettable)
The MC54/74HC4538A is identical in pinout to the MC14538B. The device
inputs are compatible with standard CMOS outputs; with pullup resistors,
they are compatible with LSTTL outputs.
This dual monostable multivibrator may be triggered by either the positive
or the negative edge of an input pulse, and produces a precision output
pulse over a wide range of pulse widths. Because the device has conditioned
trigger inputs, there are no trigger–input rise and fall time restrictions. The
output pulse width is determined by the external timing components, Rx and
Cx. The device has a reset function which forces the Q output low and the Q
output high, regardless of the state of the output pulse circuitry.
•
Unlimited Rise and Fall Times Allowed on the Trigger Inputs
•
Output Pulse is Independent of the Trigger Pulse Width
• ±
10% Guaranteed Pulse Width Variation from Part to Part (Using the
Same Test Jig)
•
Output Drive Capability: 10 LSTTL Loads
•
Outputs Directly Interface to CMOS, NMOS and TTL
•
Operating Voltage Range: 3.0 to 6.0 V
•
Low Input Current: 1.0
µA
•
High Noise Immunity Characteristic of CMOS Devices
•
In Compliance with the Requirements Defined by JEDEC Standard
No. 7A
•
Chip Complexity: 145 FETs or 36 Equivalent Gates
MC54/74HC4538A
16
1
J SUFFIX
CERAMIC PACKAGE
CASE 620–10
16
1
N SUFFIX
PLASTIC PACKAGE
CASE 648–08
16
1
D SUFFIX
SOIC PACKAGE
CASE 751B–05
ORDERING INFORMATION
MC54HCXXXXAJ
MC74HCXXXXAN
MC74HCXXXXAD
Ceramic
Plastic
SOIC
PIN ASSIGNMENT
GND
CX1/RX1
RESET 1
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
VCC
GND
CX2/RX2
RESET 2
A2
B2
Q2
Q2
LOGIC DIAGRAM
CX1
1
4
TRIGGER A1
INPUTS B1 5
3
15
TRIGGER
INPUTS
A2
B2
12
11
14
10
9
Reset
Q2
Q2
H
H
H
H
H
H
L
2
6
7
Q1
Q1
CX2
RX2
VCC
RX1
VCC
A1
B1
Q1
Q1
GND
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
RESET 1
RESET 2
13
PIN 16 = VCC
PIN 8 = GND
RX AND CX ARE EXTERNAL COMPONENTS
PIN 1 AND PIN 15 MUST BE HARD WIRED TO GND
10/95
©
Motorola, Inc. 1995
3–1
REV 6
MOTOROLA [ MOTOROLA, INC ]
