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PDF DM54123 Data sheet ( Hoja de datos )

Número de pieza DM54123
Descripción Dual Retriggerable One-Shot with Clear and Complementary Outputs
Fabricantes National Semiconductor 
Logotipo National Semiconductor Logotipo



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No Preview Available ! DM54123 Hoja de datos, Descripción, Manual

March 1993
DM54123 DM74123 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
Triggering Truth Table
Inputs
Response
A B CLR
XX
KL
KH
L No Trigger
X No Trigger
H Trigger
H L X No Trigger
L L H Trigger
L H L Trigger
H e HIGH Voltage Level
L e LOW Voltage Level
X e Immaterial
TL F 6539 – 1
Order Number DM54123J-MIL DM54123W-MIL or DM74123N
See NS Package Number J16A N16A or W16A
C1995 National Semiconductor Corporation TL F 6539
RRD-B30M105 Printed in U S A

1 page




DM54123 pdf
Physical Dimensions inches (millimeters)
Ceramic Dual-In-Line Package (J)
Order Number DM54123J-MIL
NS Package Number J16A
Molded Dual-In-Line Package (N)
Order Number DM74123N
NS Package Number N16A
5

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