dm74ls122 National Semiconductor Corporation, dm74ls122 Datasheet

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dm74ls122

Manufacturer Part Number
dm74ls122
Description
Dm74ls122 Retriggerable One-shot With Clear And Complementary Outputs
Manufacturer
National Semiconductor Corporation
Datasheet
C 1995 National Semiconductor Corporation
DM74LS122 Retriggerable One-Shot with
Clear and Complementary Outputs
General Description
The DM74LS122 is a retriggerable monostable multivibrator
featuring both positive and negative edge triggering with
complementary outputs An internal 10 kX timing resistor is
provided for design convenience minimizing component
count and layout problems This device can be used with a
single external capacitor The ’LS122 has two active-low
transition triggering inputs (A) two active-high transition trig-
gering inputs (B) and a CLEAR input that terminates the
output pulse width at a predetermined time independent of
the timing components The clear (CLR) input also serves
as a trigger input when it is pulsed with a low level pulse
transition (
tion please read operating rules and NSC one-shot applica-
tion notes carefully and observe recommendations
Features
Y
Connection Diagram
DC triggered from active-high transition or active-low
transition inputs
Order Number DM74LS122M or DM74LS122N
See NS Package Number M14A or N14A
) To obtain optimum and trouble free opera-
Dual-In-Line Package
TL F 6385
TL F 6385 – 1
Y
Y
Y
Y
Y
Y
Functional Description
The basic output pulse width is determined by selection of
the internal resistor R
capacitor (C
be extended by retriggering the gated active-low (A) tran-
sition inputs or the active-high transition (B) inputs or the
CLEAR input The output pulse width can be reduced or
terminated by overriding it with the active-low CLEAR input
Function Table
H
L
X
u
v
e
e
e
CLEAR
Retriggerable to 100% duty cycle
Over-riding clear terminates output pulse
Internal 10 kX timing resistor
TTL DTL compatible
Compensated for V
Input clamp diodes
e
e
e
e
Low Logic Level
Can Be Either Low or High
High Logic Level
u
u
Positive Going Transition
Negative Going Transition
H
H
H
H
H
H
H
L
X
X
X
A Positive Pulse
A Negative Pulse
X
) Once triggered the output pulse width may
A1
v
v
X
H
X
X
X
X
H
X
L
L
L
Inputs
CC
A2
v
v
INT
H
H
X
X
X
X
X
L
L
X
L
and temperature variations
or an external resistor (R
B1
u
u
X
X
X
H
H
H
H
H
H
H
L
B2
u
u
H
H
H
H
H
H
H
X
X
X
L
RRD-B30M105 Printed in U S A
Q
L
L
L
L
Outputs
May 1989
X
) and
Q
H
H
H
H

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dm74ls122 Summary of contents

Page 1

... DM74LS122 Retriggerable One-Shot with Clear and Complementary Outputs General Description The DM74LS122 is a retriggerable monostable multivibrator featuring both positive and negative edge triggering with complementary outputs An internal 10 kX timing resistor is provided for design convenience minimizing component count and layout problems This device can be used with a single external capacitor The ’ ...

Page 2

Absolute Maximum Ratings If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Supply Voltage Input Voltage Operating Free Air Temperature Range DM74LS Storage Temperature Recommended Operating ...

Page 3

Switching Characteristics From (Input) Symbol Parameter To (Output) t Propagation Delay Time PLH Low to High Level Output t Propagation Delay Time PLH Low to High Level Output t Propagation Delay Time A to ...

Page 4

Operating Rules (Continued) The K factor is not a constant but varies with C Figure 2 FIGURE 2 4 The switching diode required for most TTL one-shots when using an electrolytic timing capacitor is not needed for the ’LS122 and ...

Page 5

... Physical Dimensions inches (millimeters) 14-Lead Small Outline Molded Package (M) Order Number DM74LS122M NS Package Number M14A 5 ...

Page 6

... Italiano National does not assume any responsibility for use of any circuitry described no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications Order Number DM74LS122N NS Package Number N14A 2 A critical component is any component of a life ...

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