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What is 74121?

This electronic component, produced by the manufacturer "Fairchild Semiconductor", performs the same function as "One-Shot with Clear and Complementary Outputs".


74121 Datasheet PDF - Fairchild Semiconductor

Part Number 74121
Description One-Shot with Clear and Complementary Outputs
Manufacturers Fairchild Semiconductor 
Logo Fairchild Semiconductor Logo 


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June 1989
Revised November 1999
DM74121
One-Shot with Clear and Complementary Outputs
General Description
The DM74121 is a monostable multivibrator featuring both
positive and negative edge triggering with complementary
outputs. An internal 2ktiming resistor is provided for
design convenience minimizing component count and lay-
out problems. this device can be used with a single exter-
nal capacitor. Inputs (A) are active-LOW trigger transition
inputs and input (B) is and active-HIGH transition Schmitt-
trigger input that allows jitter-free triggering from inputs with
transition rates as slow as 1 volt/second. A high immunity
to VCC noise of typically 1.5V is also provided by internal
circuitry at the input stage.
To obtain optimum and trouble free operation please read
operating rules and one-shot application notes carefully
and observe recommendations.
Features
s Triggered from active-HIGH transition or active-LOW
transition inputs
s Variable pulse width from 30 ns to 28 seconds
s Jitter free Schmitt-trigger input
s Excellent noise immunity typically 1.2V
s Stable pulse width up to 90% duty cycle
s TTL, DTL compatible
s Compensated for VCC and temperature variations
s Input clamp diodes
Ordering Code:
Order Number Package Number
Package Description
DM74121N
N14A
14-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Connection Diagram
Function Table
Functional Description
The basic output pulse width is determined by selection of
an internal resistor RINT or an external resistor (RX) and
capacitor (CX). Once triggered the output pulse width is
independent of further transitions of the inputs and is func-
tion of the timing components. Pulse width can vary from a
Inputs
A1 A2
LX
XL
XX
HH
H
H
↓↓
LX
XL
H = HIGH Logic Level
L = LOW Logic Level
X = Can Be Either LOW or HIGH
= A Positive Pulse
= A Negative Pulse
Outputs
BQQ
HLH
HLH
L LH
X
H
H
H
L
H
↑ = Positive Going Transition
↓ = Negative Going Transition
few nano-seconds to 28 seconds by choosing appropriate
RX and CX combinations. There are three trigger inputs
from the device, two negative edge-triggering (A) inputs,
one positive edge Schmitt-triggering (B) input.
© 1999 Fairchild Semiconductor Corporation DS006538
www.fairchildsemi.com

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74121 equivalent
Physical Dimensions inches (millimeters) unless otherwise noted
14-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Package Number N14A
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
FAIRCHILDS 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.
www.fairchildsemi.com
5 www.fairchildsemi.com


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1. - Monostable multivibrator - Fairchild

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