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National Semiconductor Electronic Components Datasheet

HC123 Datasheet

Dual Retriggerable Monostable Multivibrator

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HC123 pdf
January 1988
MM54HC123A MM74HC123A
Dual Retriggerable Monostable Multivibrator
General Description
The MM54 74HC123A high speed monostable multivibra-
tors (one shots) utilize advanced silicon-gate CMOS tech-
nology 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 posi-
tive 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 PWe(REXT) (CEXT) where PW
is in seconds R is in ohms and C is in farads All inputs are
protected from damage due to static discharge by diodes to
VCC and ground
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 T e RC
Y Wide pulse range 400 ns to % (typ)
Y Part to part variation g5% (typ)
Y Schmitt Trigger A B inputs 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
TL F 5206 – 1
Top View
Order Number MM54HC123A or MM74HC123A
Truth Table
Inputs
Clear A
LX
XH
XX
HL
Hv
uL
B
X
X
L
u
H
H
Outputs
QQ
LH
LH
LH
H e High Level
L e Low Level
u e Transition from Low to High
v e Transition from High to Low
e One High Level Pulse
e One Low Level Pulse
X e Irrelevant
C1995 National Semiconductor Corporation TL F 5206
RRD-B30M105 Printed in U S A


National Semiconductor Electronic Components Datasheet

HC123 Datasheet

Dual Retriggerable Monostable Multivibrator

No Preview Available !

HC123 pdf
Absolute Maximum Ratings (Notes 1 2)
If Military Aerospace specified devices are required
please contact the National Semiconductor Sales
Office Distributors for availability and specifications
Supply Voltage (VCC)
b0 5V to a7 0V
DC Input Voltage (VIN)
b1 5V to VCCa1 5V
DC Output Voltage (VOUT)
b0 5V to VCCa0 5V
Clamp Diode Current (IIK IOK)
g20 mA
DC Output Current per pin (IOUT)
g25 mA
DC VCC or GND Current per pin (ICC)
g50 mA
Storage Temperature Range (TSTG)
b65 C to a150 C
Power Dissipation (PD)
(Note 3)
600 mW
S O Package only
500 mW
Lead Temperature (TL)
(Soldering 10 seconds)
260 C
Operating Conditions
Supply Voltage VCC
DC Input or Output Voltage
VIN VOUT
Operating Temp Range (TA)
MM HC
MM HC
Min
b
b
Input Rise or Fall Times
(Clear Input)
tr tf VCCe V
VCCe V
VCCe V
Max
VCC
a
a
Units
V
V
C
C
ns
ns
ns
DC Electrical Characteristics (Note 4)
Symbol
Parameter
Conditions
VCC TAe25 C
Typ
74HC
54HC
TAeb40 to 85 C TAeb55 to 125 C
Guaranteed Limits
Units
VIH Minimum High Level Input
Voltage
V
V
V
V
V
V
VIL Maximum Low Level Input
Voltage
V
V
V
V
V
V
VOH
Minimum High Level
Output Voltage
VINeVIH or VIL
lIOUTls mA
V
V
V
V
V
V
VOL Maximum Low Level
Output Voltage
VINeVIH or VIL
lIOUTls mA
lIOUTls mA
VINeVIH or VIL
lIOUTls mA
V
V
V
V
V
V
V
V
V
V
V
VINeVIH or VIL
lIOUTls mA
lIOUTls mA
V
V
IIN
Maximum Input Current
VINeVCC or GND
V
Pins
g
g
V
V
V
g mA
IIN
Maximum Input Current
VINeVCC or GND
V
all other pins
g
g
g mA
ICC
Maximum Quiescent Supply VINeVCC or GND
V
Current standby
IOUTe mA
ICC
Maximum Active Supply
VINeVCC or GND
V
Current per
R CEXTe VCC
V
monostable
V
mA
mA
mA
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 b12mW C from 65 C to 85 C
Ceramic ‘‘J’’ Package b12mW C from 100 C to 125 C
Note 4 For a power supply of 5V g10% the worst-case output voltages (VOH VOL) occur for HC at 4 5V Thus the 4 5V values should be used when designing
with this supply Worst-case VIH and VIL occur at VCCe5 5V and 4 5V respectively (The VIH value at 5 5V is 3 85V ) The worst-case leakage current (IIN ICC and
IOZ) occur for CMOS at the higher voltage and so the 6 0V values should be used
2


Part Number HC123
Description Dual Retriggerable Monostable Multivibrator
Maker National Semiconductor
Total Page 6 Pages
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