DM54121J National Semiconductor, DM54121J Datasheet

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DM54121J

Manufacturer Part Number
DM54121J
Description
One-Shot with Clear and Complementary Outputs
Manufacturer
National Semiconductor
Datasheet

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DM54121J
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C 1995 National Semiconductor Corporation
54121 DM54121 DM74121 One-Shot with
Clear and Complementary Outputs
General Description
The DM54 74121 is a monostable multivibrator featuring
both positive and negative edge triggering with complemen-
tary outputs An internal 2k
design convenience minimizing component count and lay-
out problems This device can be used with a single external
capacitor Inputs (A) are active-low trigger transition inputs
and input (B) is an active-high transition Schmitt-trigger in-
put that allows jitter-free triggering from inputs with tran-
sition rates as slow as 1 volt second A high immunity to
V
cuitry at the input stage
To obtain optimum and trouble free operation please read
operating rules and NSC one-shot application notes careful-
ly and observe recommendations
Features
Y
Y
Connection Diagram
CC
Triggered from active-high transition or active-low tran-
sition inputs
Variable pulse width from 30 ns to 28 seconds
noise of typically 1 5V is also provided by internal cir-
See NS Package Number J14A N14A or W14B
Order Number 54121DMQB 54121FMQB
DM54121J DM54121W or DM74121N
Dual-In-Line Package
TL F 6538
timing resistor is provided for
TL F 6538 – 1
Y
Y
Y
Y
Y
Y
Y
Functional Description
The basic output pulse width is determined by selection of
an internal resistor R
capacitor (C
dependent of further transitions of the inputs and is a func-
tion of the timing components Pulse width can vary from a
few nano-seconds to 28 seconds by choosing appropriate
R
the device two negative edge-triggering (A) inputs one pos-
itive edge Schmitt-triggering (B) input
Function Table
H
L
X
X
Jitter free Schmitt-trigger input
Excellent noise immunity typically 1 2V
Stable pulse width up to 90% duty cycle
TTL DTL compatible
Compensated for V
Input clamp diodes
Alternate Military Aerospace device (54121) is avail-
able Contact a National Semiconductor Sales Office
Distributor for specifications
and C
e
e
e
e
e
e
e
A1
H
H
L
X
X
L
X
High Logic Level
Low Logic Level
Can Be Either Low or High
Positive Going Transition
Negative Going Transition
A Positive Pulse
A Negative Pulse
X
combinations There are three trigger inputs from
X
) Once triggered the output pulse width is in-
Inputs
A2
H
H
X
L
X
X
L
INT
CC
and temperature variations
or an external resistor (R
B
H
H
H
H
H
L
X
RRD-B30M105 Printed in U S A
Q
L
L
L
L
Outputs
June 1989
Q
H
H
H
H
X
) and

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DM54121J Summary of contents

Page 1

... Triggered from active-high transition or active-low tran- Y sition inputs Variable pulse width from seconds Y Connection Diagram Dual-In-Line Package Order Number 54121DMQB 54121FMQB DM54121J DM54121W or DM74121N See NS Package Number J14A N14A or W14B C 1995 National Semiconductor Corporation TL F 6538 Jitter free Schmitt-trigger input Y Excellent noise immunity typically ...

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 DM54 b DM74 Storage Temperature Range b Recommended Operating Conditions Symbol Parameter V Supply Voltage ...

Page 3

Switching Characteristics Symbol Parameter 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 Time PHL High ...

Page 4

Operating Rules (Continued) 5 Output pulse width versus V and operation tempera- CC tures Figure 3 depicts the relationship between pulse Figure 4 depicts pulse width width variation versus V CC variation versus ambient temperature FIGURE 3 FIGURE 4 6 ...

Page 5

... Physical Dimensions inches (millimeters) 14-Lead Ceramic Dual-In-Line Package (J) Order Number 54121DMQB or DM54121J 14-Lead Molded Dual-In-Line Package (N) NS Package Number J14A Order Number DM74121N NS Package Number N14A 5 ...

Page 6

... Hong Kong Ltd 49) 0-180-530 85 86 13th Floor Straight Block a Ocean Centre 5 Canton Rd 49) 0-180-530 85 85 Tsimshatsui Kowloon a Tel ( 49) 0-180-532 78 32 Hong Kong a 49) 0-180-532 93 58 Tel (852) 2737-1600 a Tel ( 49) 0-180-534 16 80 Fax (852) 2736-9960 a National Semiconductor Japan Ltd Tel 81-043-299-2309 Fax 81-043-299-2408 ...

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