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DM74121 Datasheet(PDF) 1 Page - Fairchild Semiconductor

Part No. DM74121
Description  One-Shot with Clear and Complementary Outputs
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Maker  FAIRCHILD [Fairchild Semiconductor]
Homepage  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

DM74121 Datasheet(HTML) 1 Page - Fairchild Semiconductor

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© 1999 Fairchild Semiconductor Corporation
DS006538
www.fairchildsemi.com
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 2k
Ω timing 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:
Connection Diagram
Function Table
H
= HIGH Logic Level
↑ = Positive Going Transition
L
= LOW Logic Level
↓ = Negative Going Transition
X
= Can Be Either LOW or HIGH
= A Positive Pulse
= A Negative Pulse
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
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.
Order Number
Package Number
Package Description
DM74121N
N14A
14-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Inputs
Outputs
A1
A2
B
Q
Q
LX
H
L
H
XL
H
L
H
XX
L
L
H
HH
X
L
H
H
H
HH
↓↓
H
LX
XL


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