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DM54123 Datasheet(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. DM54123
Description  Dual Retriggerable One-Shot with Clear and Complementary Outputs
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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DM54123 Datasheet(HTML) 1 Page - National Semiconductor (TI)

   
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TLF6539
March 1993
DM54123DM74123 Dual Retriggerable One-Shot with
Clear and Complementary Outputs
General Description
The ’123 is a dual retriggerable monostable multivibrator
capable of generating output pulses from a few nano-sec-
onds 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 tran-
sition trigger input A low at the clear (CLR) input terminates
the output pulse which also inhibits triggering 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 de-
vice please read the operating rules as well as the NSC
one – shot application notes carefully and observe recom-
mendations
Features
Y
DC triggered from active-high transition or active-low
transition inputs
Y
Retriggerable to 100% duty cycle
Y
Direct reset terminates output pulse
Y
Compensated for VCC and temperature variations
Y
DTL TTL compatible
Y
Input clamp diodes
Functional Description
The basic output pulse width is determined by selection of
an external resistor (RX) and capacitor (CX) Once triggered
the basic pulse width may be extended by retriggering 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 continuous ‘‘HIGH’’ logic state
is maintained at the ‘‘Q’’ output
Connection Diagram
Dual-In-Line Package
TLF6539 – 1
Order Number DM54123J-MIL DM54123W-MIL or DM74123N
See NS Package Number J16A N16A or W16A
Triggering Truth Table
Inputs
Response
A
B
CLR
X
X
L
No Trigger
K
L
X
No Trigger
K
H
H
Trigger
H
L
X
No Trigger
L
L
H
Trigger
LH
L
Trigger
H e HIGH Voltage Level
L e LOW Voltage Level
X e Immaterial
C1995 National Semiconductor Corporation
RRD-B30M105Printed in U S A


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