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DM74LS123 Datasheet(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. DM74LS123
Description  Dual Retriggerable One-Shot with Clear and Complementary Outputs
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
Logo NSC - National Semiconductor (TI)

DM74LS123 Datasheet(HTML) 1 Page - National Semiconductor (TI)

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TLF6386
March 1991
DM74LS123 Dual Retriggerable One-Shot
with Clear and Complementary Outputs
General Description
The DM74LS123 is a dual retriggerable monostable multivi-
brator capable of generating output pulses from a few nano-
seconds 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 The clear (CLR) input terminates the out-
put pulse at a predetermined time independent of the timing
components The clear input also serves as a trigger input
when it is pulsed with a low level pulse transition (
) To
obtain the best trouble free operation from this device
please read the operating rules as well as the NSC one-shot
application notes carefully and observe recommendations
Features
Y
DC triggered from active-high transition or active-low
transition inputs
Y
Retriggerable to 100% duty cycle
Y
Compensated for VCC and temperature variations
Y
Triggerable from CLEAR input
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 or CLEAR input Retrig-
gering 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
TLF6386 – 1
Order Number DM74LS123M or DM74LS123N
See NS Package Number M16A or N16E
Function Table
Inputs
Outputs
CLEAR
A
B
Q
Q
LX
X
L
H
XH
X
L
H
XX
L
L
H
HL
u
H
v
H
u
LH
H e High Logic Level
L e Low Logic Level
X e Can Be Either Low or High
u e Positive Going Transition
v e Negative Going Transition
e
A Positive Pulse
e
A Negative Pulse
C1995 National Semiconductor Corporation
RRD-B30M105Printed in U S A


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