1/11March 2004
■ HIGH SPEED: t
PD
= 23 ns (TYP.) at V
CC
= 6V
■ LOW POWER DISSIPATION:
STAND BY STATE:
I
CC
=4µA (MAX.) at T
A
=25°C
ACTIVE STATE:
I
CC
=200µA (MAX.) at V
CC
= 5V
■ HIGH NOISE IMMUNITY:
V
NIH
= V
NIL
= 28% V
CC
(MIN.)
■ SYMMETRICAL OUTPUT IMPEDANCE:
|I
OH
| = I
OL
= 4mA (MIN)
■ BALANCED PROPAGATION DELAYS:
t
PLH
≅ t
PHL
■ WIDE OPERATING VOLTAGE RANGE:
V
CC
(OPR) = 2V to 6V
■ WIDE OUTPUT PULSE WIDTH RANGE:
t
WOUT
= 120 ns ~ 60 s OVER AT V
CC
= 4.5 V
■ PIN AND FUNCTION COMPATIBLE WITH
54 SERIES 123
■ SPACE GRADE-1: ESA SCC QUALIFIED
■ 50 krad QUALIFIED, 100 krad AVAILABLE ON
REQUEST
■ NO SEL UNDER HIGH LET HEAVY IONS
IRRADIATION
■ DEVICE FULLY COMPLIANT WITH
SCC-9207-006
DESCRIPTION
The M54HC123 is an high speed CMOS
MONOSTABLE MULTIVIBRATOR fabricated with
silicon gate C
2
MOS technology.
There are two trigger inputs, A
INPUT (negative
edge) and B INPUT (positive edge). These inputs
are valid for slow rising/falling signals, (tr=tf=l sec).
The device may also be triggered by using the
CLR
input (positive-edge) because of the
Schmitt-trigger input; after triggering the output
maintains the MONOSTABLE state for the time
period determined by the external resistor R
X
and
capacitor C
X
. When C
X
> 10nF and R
X
> 10KΩ,
the output pulse width value is approximately
given by the formula: t
W(OUT)
= K · C
x
· R
x
.
(K
≅ 0.45).
Taking CLR low breaks this MONOSTABLE
STATE. If the next trigger pulse occurs during the
MONOSTABLE period it makes the
MONOSTABLE period longer. Limit for values of
C
x
and R
x
: C
x
: NO LIMIT
R
x
: V
CC
< 3.0V 5KΩ to 1MΩ
V
CC
> 3.0V 1KΩ to 1MΩ
All inputs are equipped with protection circuits
against static discharge and transient excess
voltage.
M54HC123
RAD-HARD DUAL
RETRIGGERABLE MONOSTABLE MULTIVIBRATOR
PIN CONNECTION
ORDER CODES
PACKAGE FM EM
DILC M54HC123D M54HC123D1
FPC M54HC123K M54HC123K1
DILC-16 FPC-16
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