M74HC123 Datasheet, PDF (1/12 Pages) STMicroelectronics – DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR

M74HC123
DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR
s HIGH SPEED :
t_PD = 23 ns (TYP.) at V_CC = 6V
s 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
s HIGH NOISE IMMUNITY:
V_NIH = V_NIL = 28 % V_CC (MIN.)
s SYMMETRICAL OUTPUT IMPEDANCE:
|I_OH| = I_OL = 4mA (MIN)
s BALANCED PROPAGATION DELAYS:
t_PLH ≅ t_PHL
s WIDE OPERATING VOLTAGE RANGE:
V_CC (OPR) = 2V to 6V
s WIDE OUTPUT PULSE WIDTH RANGE :
t_WOUT = 120 ns ~ 60 s OVER AT V_CC = 4.5 V
s PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 123
DESCRIPTION
The M74HC123 is an high speed CMOS
MONOSTABLE MULTIVIBRATOR fabricated with
silicon gate C²MOS 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
PIN CONNECTION AND IEC LOGIC SYMBOLS
DIP
SOP
TSSOP
ORDER CODES
PACKAGE
TUBE
DIP
SOP
TSSOP
M74HC123B1R
M74HC123M1R
T&R
M74HC123RM13TR
M74HC123TTR
period determined by the external resistor Rx and
capacitor Cx. When Cx > 10nF and Rx > 10KΩ,
the output pulse width value is approsimatively
given by the formula : tW(OUT) = K · Cx · Rx.
(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
Cx and Rx : Cx : NO LIMIT
Rx : 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.
July 2001
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