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National Semiconductor Electronic Components Datasheet

DM54123 Datasheet

Dual Retriggerable One-Shot with Clear and Complementary Outputs

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DM54123 pdf
March 1993
DM54123 DM74123 Dual Retriggerable One-Shot with
Clear and Complementary Outputs
General Description
The ’123 is a dual retriggerable monostable multivibrator
capable of generating output pulses from a few nano-sec-
onds 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 A low at the clear (CLR) input terminates
the output pulse which also inhibits triggering An internal
connection from CLR to the input gate makes it possible to
trigger the circuit by a positive-going signal on CLR as
shown in the truth table
To obtain the best and trouble free operation from this de-
vice please read the operating rules as well as the NSC
one – shot application notes carefully and observe recom-
mendations
Features
Y DC triggered from active-high transition or active-low
transition inputs
Y Retriggerable to 100% duty cycle
Y Direct reset terminates output pulse
Y Compensated for VCC and temperature variations
Y DTL TTL compatible
Y Input clamp diodes
Functional Description
The basic output pulse width is determined by selection of
an external resistor (RX) and capacitor (CX) 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 transition clear input
Retriggering 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 ‘‘HIGH’’ logic state
is maintained at the ‘‘Q’’ output
Connection Diagram
Dual-In-Line Package
Triggering Truth Table
Inputs
Response
A B CLR
XX
KL
KH
L No Trigger
X No Trigger
H Trigger
H L X No Trigger
L L H Trigger
L H L Trigger
H e HIGH Voltage Level
L e LOW Voltage Level
X e Immaterial
TL F 6539 – 1
Order Number DM54123J-MIL DM54123W-MIL or DM74123N
See NS Package Number J16A N16A or W16A
C1995 National Semiconductor Corporation TL F 6539
RRD-B30M105 Printed in U S A


National Semiconductor Electronic Components Datasheet

DM54123 Datasheet

Dual Retriggerable One-Shot with Clear and Complementary Outputs

No Preview Available !

DM54123 pdf
Absolute Maximum Ratings (Note)
If Military Aerospace specified devices are required
please contact the National Semiconductor Sales
Office Distributors for availability and specifications
Supply Voltage
7V
Input Voltage
5 5V
Operating Free Air Temperature Range
DM54
b55 C to a100 C
DM74
0 C to a70 C
Storage Temperature
b65 C to a150 C
Recommended Operating Conditions
Note The ‘‘Absolute Maximum Ratings’’ are those values
beyond which the safety of the device cannot be guaran-
teed The device should not be operated at these limits The
parametric values defined in the ‘‘Electrical Characteristics’’
table are not guaranteed at the absolute maximum ratings
The ‘‘Recommended Operating Conditions’’ table will define
the conditions for actual device operation
Symbol
VCC
VIH
VIL
IOH
IOL
tW
TWQ
(Min)
REXT
CEXT
CWIRE
TA
Parameter
Supply Voltage
High Level Input Voltage
Low Level Input Voltage
High Level Output Current
Low Level Output Current
Pulse Width
(Note 5)
Minimum Width of
Pulse at Q (Note 5)
External Timing Resistor
External Timing Capacitance
Wiring Capacitance
at REXT CEXT Terminal (Note 5)
Free Air Operating Temperature
A or B High
A or B Low
Clear Low
A or B
DM54123
Min Nom Max
45 5 55
2
08
b0 8
16
80
b55
125
Min
4 75
2
40
40
40
DM74123
Nom Max
5 5 25
08
b0 8
16
65
5 50
No Restriction
50
0 70
Units
V
V
V
mA
mA
ns
ns
kX
mF
pF
C
Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Symbol
Parameter
Conditions
Min
Typ
(Note 1)
Max
Units
VI
VOH
VOL
II
Input Clamp Voltage
High Level Output
Voltage
Low Level Output
Voltage
Input Current Max
Input Voltage
VCC e Min II e b12 mA
VCC e Min IOH e Max
VIL e Max VIH e Min
VCC e Min IOL e Max
VIH e Min VIL e Max
VCC e Max VI e 5 5V
DM54
DM74
24
25
b1 5
V
34 V
02 04 V
1 mA
IIH High Level Input
Current
VCC e Max
VI e 2 4V
Data
Clear
40 mA
80
IIL
Low Level Input Current
VCC e Max VI e 0 4V
Clear
Data
b3 2
b1 6
mA
IOS Short Circuit
Output Current
VCC e Max
(Note 2)
DM54
DM74
b10
b10
b40
b40
mA
ICC Supply Current
VCC e Max (Notes 3 and 4)
46 66 mA
Note 1 All typicals are at VCC e 5V TA e 25 C
Note 2 Not more than one output should be shorted at a time
Note 3 Quiescent ICC is measured (after clearing) with 2 4V applied to all clear and A inputs B inputs grounded all outputs open CEXT e 0 02 mF and REXT e
25 KX
Note 4 ICC is measured in the triggered state with 2 4V applied to all clear and B inputs A inputs grounded all outputs open CEXT e 0 02 mF and REXT e 25 kX
Note 5 TA e 25 C and VCC e 5V
2


Part Number DM54123
Description Dual Retriggerable One-Shot with Clear and Complementary Outputs
Maker National Semiconductor
Total Page 6 Pages
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