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DM74LS123M Datasheet

  • DM74LS123M

  • Dual Retriggerable One-Shot with Clear and Complementary Out...

  • 6頁(yè)

  • NSC

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DM74LS123 Dual Retriggerable One-Shot
with Clear and Complementary Outputs
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
Y
Y
Y
Y
Compensated for V
CC
and temperature variations
Triggerable from CLEAR input
DTL TTL compatible
Input clamp diodes
Functional Description
The basic output pulse width is determined by selection of
an external resistor (R
X
) and capacitor (C
X
) 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 鈥樷€楬IGH鈥欌€?logic state is
maintained at the 鈥樷€楺鈥欌€?output
Features
Y
Y
DC triggered from active-high transition or active-low
transition inputs
Retriggerable to 100% duty cycle
Connection Diagram
Dual-In-Line Package
Function Table
Inputs
CLEAR
L
X
X
H
H
A
X
H
X
L
B
X
X
L
Q
L
L
L
Outputs
Q
H
H
H
u
H
H
v
L
u
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
TL F 6386 鈥?1
Order Number DM74LS123M or DM74LS123N
See NS Package Number M16A or N16E
C
1995 National Semiconductor Corporation
TL F 6386
RRD-B30M105 Printed in U S A

DM74LS123M 產(chǎn)品屬性

  • 48

  • 集成電路 (IC)

  • 邏輯 - 多頻振蕩器

  • 74LS

  • 單穩(wěn)態(tài)

  • 2

  • 無(wú)

  • 45ns

  • 400µA, 8mA

  • 4.75 V ~ 5.25 V

  • 0°C ~ 70°C

  • 表面貼裝

  • 16-SOIC（0.154"，3.90mm 寬）

  • 16-SOIC

  • 管件

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