DM74121 One-Shot with Clear and Complementary Outputs
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鈩?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 V
CC
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 V
CC
and temperature variations
s
Input clamp diodes
Ordering Code:
Order Number
DM74121N
Package Number
N14A
Package Description
14-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Connection Diagram
Function Table
Inputs
A1
L
X
X
H
H
鈫?/div>
鈫?/div>
L
X
A2
X
L
X
H
鈫?/div>
H
鈫?/div>
X
L
B
H
H
L
X
H
H
H
鈫?/div>
鈫?/div>
Q
L
L
L
Outputs
Q
H
H
H
H
=
HIGH Logic Level
L
=
LOW Logic Level
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 R
INT
or an external resistor (R
X
) and
capacitor (C
X
). 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
鈫?=
Positive Going Transition
鈫?=
Negative Going Transition
L
H
few nano-seconds to 28 seconds by choosing appropriate
R
X
and C
X
combinations. There are three trigger inputs
from the device, two negative edge-triggering (A) inputs,
one positive edge Schmitt-triggering (B) input.
漏 1999 Fairchild Semiconductor Corporation
DS006538
www.fairchildsemi.com
DM74121N 產(chǎn)品屬性
Fairchild Semiconductor
1
TTL
Monostable Multivibrator
PDIP-14 Wide
80 ns
- 0.4 mA
16 mA
5.25 V
4.75 V
+ 70 C
0 C
Through Hole
5 V
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