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PDF DM74123 Data sheet ( Hoja de datos )

Número de pieza DM74123
Descripción Dual Retriggerable One-Shot with Clear and Complementary Outputs
Fabricantes Fairchild Semiconductor 
Logotipo Fairchild Semiconductor Logotipo



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August 1986
Revised March 2000
DM74123
Dual Retriggerable One-Shot with
Clear and Complementary Outputs
General Description
The DM74123 is a dual retriggerable monostable multi-
vibrator capable of generating output pulses from a few
nano-seconds to extremely long duration up to 100% duty
cycle. Each device has three inputs permitting the choice of
either leading-edge or trailing edge triggering. Pin (A) is an
active-LOW transition trigger input and pin (B) is an active-
HIGH transition trigger input. A LOW at the clear (CLR)
input terminates the output pulse: which also inhibits trig-
gering. An internal connection from CLR to the input gate
makes it possible to trigger the circuit by a positive-going
signal on CLR as shown in the Truth Table.
To obtain the best and trouble free operation from this
device please read the Operating Rules as well as the
One–Shot Application Notes carefully and observe recom-
mendations.
Features
s DC triggered from active-HIGH transition or active-LOW
transition inputs
s Retriggerable to 100% duty cycle
s Direct reset terminates output pulse
s Compensated for VCC and temperature variations
s DTL, TTL compatible
s Input clamp diodes
Ordering Code:
Order Number Package Number
Package Description
DM74123N
N16E
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Connection Diagram
Triggering Truth Table
Inputs
AB
XX
L
H
H
L
LH
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
CLR
L
X
H
X
H
Response
No Trigger
No Trigger
Trigger
No Trigger
Trigger
Trigger
Functional Description
The basic output pulse width is determined by selection of
an external resistor (RX) and capacitor (CX). Once trig-
gered, the basic pulse width may be extended by retrigger-
ing the gated active-LOW transition or active-HIGH
transition inputs or be reduced by use of the active-LOW
transition clear input. Retriggering to 100% duty cycle is
possible by application of an input pulse train whose cycle
time is shorter than the output cycle time such that a con-
tinuous “HIGH” logic state is maintained at the “Q” output.
© 2000 Fairchild Semiconductor Corporation DS006539
www.fairchildsemi.com

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DM74123 pdf
Physical Dimensions inches (millimeters) unless otherwise noted
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Package Number N16E
Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and
Fairchild reserves the right at any time without notice to change said circuitry and specifications.
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD
SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the
body, or (b) support or sustain life, and (c) whose failure
to perform when properly used in accordance with
instructions for use provided in the labeling, can be rea-
sonably expected to result in a significant injury to the
user.
2. A critical component in any component of a life support
device or system whose failure to perform can be rea-
sonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
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