dm74ls123 Fairchild Semiconductor, dm74ls123 Datasheet

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dm74ls123

Manufacturer Part Number
dm74ls123
Description
Dual Retriggerable One-shot With Clear And Complementary Outputs
Manufacturer
Fairchild Semiconductor
Datasheet

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© 2000 Fairchild Semiconductor Corporation
DM74LS123M
DM74LS123SJ
DM74LS123N
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 (
from this device please read the operating rules as well as
the Fairchild Semiconductor one-shot application notes
carefully and observe recommendations.
Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram
Order Number
). To obtain the best trouble free operation
Package Number
M16D
M16A
N16E
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
DS006386
Features
Function Table
H
L
X
DC triggered from active-HIGH transition or active-LOW
transition inputs
Retriggerable to 100% duty cycle
Compensated for V
Triggerable from CLEAR input
DTL, TTL compatible
Input clamp diodes
LOW Logic Level
Positive Going Transition
Negative Going Transition
Can Be Either LOW or HIGH
HIGH Logic Level
CLEAR
A Positive Pulse
A Negative Pulse
Package Description
X
X
H
H
L
Inputs
A
H
X
X
L
L
CC
and temperature variations
August 1986
Revised April 2000
B
X
X
H
H
L
www.fairchildsemi.com
Q
L
L
L
Outputs
Q
H
H
H

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dm74ls123 Summary of contents

Page 1

... 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 ...

Page 2

... When an electrolytic capacitor is used for C ing diode is often required for standard TTL one-shots to prevent high inverse leakage current. This switching diode is not needed for the DM74LS123 one-shot and should not be used. In general the use of the switching diode is not recommended with retriggerable operation. ...

Page 3

... V to ground is necessary on each device. Fur- CC thermore, the bypass capacitor should be located as close to the V -pin as space permits. CC Note: For further detailed device characteristics and output per- formance please refer to the Fairchild Semiconductor one-shot application note AN-372. 3 and R must be kept pins (6) ...

Page 4

Absolute Maximum Ratings Supply Voltage Input Voltage Operating Free Air Temperature Range Storage Temperature Recommended Operating Conditions Symbol Parameter V Supply Voltage CC V HIGH Level Input Voltage IH V LOW Level Input Voltage IL I HIGH Level Output Current ...

Page 5

Switching Characteristics 5V and Symbol Parameters t Propagation Delay Time PLH LOW-to-HIGH Level Output t Propagation Delay Time PLH LOW-to-HIGH Level Output t Propagation Delay Time PHL HIGH-to-LOW Level Output t Propagation Delay ...

Page 6

Physical Dimensions inches (millimeters) unless otherwise noted 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow www.fairchildsemi.com Package Number M16A 6 ...

Page 7

Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide Package Number M16D 7 www.fairchildsemi.com ...

Page 8

Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right ...

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