DM74LS123 View Datasheet(PDF) - Fairchild Semiconductor
Part Name
Description
Manufacturer
DM74LS123 Datasheet PDF : 8 Pages
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August 1986
Revised April 2000
DM74LS123
Dual Retriggerable One-Shot
with Clear and Complementary Outputs
General Description
The DM74LS123 is a dual retriggerable monostable multi-
vibrator 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 transition trigger input. The clear (CLR) input termi-
nates the output pulse at a predetermined time indepen-
dent 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 Fairchild Semiconductor one-shot application notes
carefully and observe recommendations.
Features
s DC triggered from active-HIGH transition or active-LOW
transition inputs
s Retriggerable to 100% duty cycle
s Compensated for VCC and temperature variations
s Triggerable from CLEAR input
s DTL, TTL compatible
s Input clamp diodes
Ordering Code:
Order Number Package Number
Package Description
DM74LS123M
M16A
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
DM74LS123SJ
M16D
16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
DM74LS123N
N16E
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram
Function Table
Inputs
CLEAR
A
B
L
X
X
X
H
X
X
X
L
H
L
↑
H
↓
H
↑
L
H
H = HIGH Logic Level
L = LOW Logic Level
X = Can Be Either LOW or HIGH
↑ = Positive Going Transition
↓ = Negative Going Transition
= A Positive Pulse
= A Negative Pulse
Outputs
Q
Q
L
H
L
H
L H
© 2000 Fairchild Semiconductor Corporation DS006386
www.fairchildsemi.com
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