National Semiconductor MM54HC123A, MM74HC123A Service Manual
MM54HC123A/MM74HC123A
Dual Retriggerable Monostable Multivibrator
MM54HC123A/MM74HC123A Dual Retriggerable Monostable Multivibrator
January 1988
General Description
The MM54/74HC123A high speed monostable multivibrators (one shots) utilize advanced silicon-gate CMOS technology. They feature speeds comparable to low power
Schottky TTL circuitry while retaining the low power and
high noise immunity characteristic of CMOS circuits.
Each multivibrator features both a negative, A, and a positive, B, transition triggered input, either of which can be
used as an inhibit input. Also included is a clear input that
when taken low resets the one shot. The ’HC123 can be
triggered on the positive transition of the clear while A is
held low and B is held high.
The ’HC123A is retriggerable. That is it may be triggered
repeatedly while their outputs are generating a pulse and
the pulse will be extended.
Pulse width stability over a wide range of temperature and
supply is achieved using linear CMOS techniques. The out-
Connection Diagram
Dual-In-Line Package
put pulse equation is simply: PW
is in seconds, R is in ohms, and C is in farads. All inputs are
e
(R
)(C
EXT
); where PW
EXT
protected from damage due to static discharge by diodes to
V
and ground.
CC
Features
Y
Typical propagation delay: 25 ns
Y
Wide power supply range: 2V – 6V
Y
Low quiescent current: 80 mA maximum (74HC Series)
Y
Low input current: 1 mA maximum
Y
Fanout of 10 LS-TTL loads
Y
Simple pulse width formula TeRC
Y
Wide pulse range: 400 ns to%(typ)
Y
Part to part variation:g5% (typ)
Y
Schmitt TriggerA&Binputs enable infinite signal input
rise and fall times.
Timing Component
Note: Pin 6 and Pin 14 must be
hard-wired to GND.
TL/F/5206– 2
Top View
TL/F/5206– 1
Order Number MM54HC123A or MM74HC123A
Truth Table
e
H
Inputs Outputs
Clear AB Q Q
LXX L H
XHX L H
XXL L H
HL
H
u
C
1995 National Semiconductor Corporation RRD-B30M105/Printed in U. S. A.
u
HÉß
v
LH Éß
Éß
TL/F/5206
High Level
e
L
Low Level
e
Transition from Low to High
u
e
Transition from High to Low
v
e
É
One High Level Pulse
e
ß
One Low Level Pulse
e
X
Irrelevant
Absolute Maximum Ratings (Notes1&2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.
Supply Voltage (V
CC
)
DC Input Voltage (VIN)
DC Output Voltage (V
OUT
)
Clamp Diode Current (IIK,IOK)
DC Output Current, per pin (I
OUT
)
DC VCCor GND Current, per pin (ICC)
Storage Temperature Range (T
STG
b
b
)
b
0.5V toa7.0V
1.5V to V
CC
0.5V to V
CC
g
g
b
g
65§Ctoa150§C
a
1.5V
a
0.5V
20 mA
25 mA
50 mA
Power Dissipation (PD)
(Note 3) 600 mW
S.O. Package only 500 mW
Lead Temperature (T
(Soldering 10 seconds) 260
)
L
C
§
DC Electrical Characteristics (Note 4)
Symbol Parameter Conditions V
V
V
V
V
I
IN
I
IN
I
CC
I
CC
Minimum High Level Input 2.0V 1.5 1.5 1.5 V
IH
Voltage 4.5V 3.15 3.15 3.15 V
Maximum Low Level Input 2.0V 0.3 0.3 0.3 V
IL
Voltage 4.5V 0.9 0.9 0.9 V
Minimum High Level V
OH
Output Voltage
Maximum Low Level V
OL
Output Voltage
Maximum Input Current V
(Pins 7, 15)
Maximum Input Current V
(all other pins)
Maximum Quiescent Supply V
Current (standby) I
Maximum Active Supply V
Current (per R/C
monostable) 6.0V 0.7 2.0 2.6 3.2 mA
Note 1: Maximum Ratings are those values beyond which damage to the device may occur.
Note 2: Unless otherwise specified all voltages are referenced to ground.
Note 3: Power Dissipation Temperature Derating:
Plastic ‘‘N’’ Package:
Ceramic ‘‘J’’ Package:
Note 4: For a power supply of 5V
with this supply. Worst-case V
) occur for CMOS at the higher voltage and so the 6.0V values should be used.
I
OZ
b
12mW/§C from 65§Cto85§C
b
12mW/§C from 100§Cto125§C.
g
10% the worst-case output voltages (VOH,VOL) occur for HC at 4.5V. Thus the 4.5V values should be used when designing
and VILoccur at V
IH
e
VIHor V
IN
s
I
20 mA 2.0V 2.0 1.9 1.9 1.9 V
l
l
OUT
e
V
VIHor V
IN
s
I
4.0 mA 4.5V 4.2 3.98 3.84 3.7 V
l
l
OUT
s
I
5.2 mA 6.0V 5.7 5.48 5.34 5.2 V
l
l
OUT
e
VIHor V
IN
s
I
20 mA 2.0V 0 0.1 0.1 0.1 V
l
l
OUT
e
V
VIHor V
IN
s
I
4 mA 4.5V 0.2 0.26 0.33 0.4 V
l
l
OUT
s
I
5.2 mA 6.0V 0.2 0.26 0.33 0.4 V
l
l
OUT
e
VCCor GND 6.0V
IN
e
VCCor GND 6.0V
IN
e
VCCor GND 6.0V 8.0 80 160 mA
IN
e
0 mA
OUT
e
VCCor GND 2.0V 36 80 110 130 mA
IN
e
0.5VCC4.5V 0.33 1.0 1.3 1.6 mA
EXT
e
5.5V and 4.5V respectively. (The VIHvalue at 5.5V is 3.85V.) The worst-case leakage current (IIN,ICC, and
CC
CC
Typ Guaranteed Limits
6.0V 4.2 4.2 4.2 V
6.0V 1.2 1.2 1.2 V
IL
4.5V 4.5 4.4 4.4 4.4 V
6.0V 6.0 5.9 5.9 5.9 V
IL
IL
4.5V 0 0.1 0.1 0.1 V
6.0V 0 0.1 0.1 0.1 V
IL
Operating Conditions
Supply Voltage (V
)26V
CC
DC Input or Output Voltage 0 V
(V
IN,VOUT
)
Operating Temp. Range (TA)
MM74HC
MM54HC
Input Rise or Fall Times
(Clear Input)
e
T
25§C
A
g
g
0.5
0.1
e
V
2.0V(tr,tf) 1000 ns
CC
e
V
4.5V 500 ns
CC
e
V
6.0V 400 ns
CC
74HC 54HC
eb
T
40 to 85§CT
A
g
5.0
g
1.0
Min Max Units
b
40
b
55
eb
55 to 125§C
A
g
g
CC
a
85
a
125
V
§
§
Units
5.0 mA
1.0 mA
C
C
V
V
2
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