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M54HC123A

Part Number	M54HC123A
Manufacturer	ST Microelectronics
Description	DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR
Published	Apr 23, 2005
Detailed Description	M54HC123/123A M74HC123/123A DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR . . . . . . . . . HIGH SPEED tPD = 25 ns (TYP)...
Datasheet	M54HC123A PDF File

Overview

M54HC123/123A M74HC123/123A DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR .
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HIGH SPEED tPD = 25 ns (TYP) at VCC = 5V LOW POWER DISSIPATION STANDBY STATE ICC=4 µA (MAX.
) AT TA=25°C ACTIVE STATE ICC = 200 µA (TYP.
) AT VCC=5V HIGH NOISE IMMUNITY VNIH = VNIL = 28 % VCC (MIN.
) OUTPUT DRIVE CAPABILITY 10 LSTTL LOADS SYMMETRICAL OUTPUT IMPEDANCE IOH = IOL = 4 mA (MIN.
) BALANCED PROPAGATION DELAYS tPLH = tPHL WIDE OPERATING VOLTAGE RANGE VCC (OPR) = 2 V TO 6 V WIDE OUTPUT PULSE WIDTH RANGE tWOUT = 120 ns ∼ 60 s OVER AT VCC = 4.
5 V PIN AND FUNCTION COMPATIBLE WITH 54/74LS123 B1R (Plastic Package) F1R (Ceramic Package) M1R (Micro Package) C1R (Chip Carrier) ORDER CODES : M54HCXXXF1R M74HCXXXM1R M74HCXXXB1R M74HCXXXC1R DESCRIPTION The M54/74HC123 is a high speed CMOS MONOSTABLE multivibrator fabricated with silicon gate C2MOS technology.
It achieves the high speed operation similar to equivalent LSTTL while maintaining the CMOS low power dissipation.
There are two trigger inputs, A INPUT (negative edge) and 8 INPUT (positive edge).
These inputs are valid for slow rising/falling signals, (tr = tf = I 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 Rx and capacitor Cx.
When Cx ≥ 10nF and Rx ≥ 10KΩ, the output pulse width value is approssimatively given by the formula: tw(out) = K • Cx • Rx.
Two different pulse width constant are available: K ≅ 0.
45 for HC123 K ≅ 1 for HC123A.
Taking CLR low breaks this MONOSTABLE STATE.
If the next trigger pulse occurs during the MONOSTABLEperiod it makes the MONOSTABLE period longer.
Limit for values of Cx and Rx : Cx : NO LIMIT Rx : VCC < 3.
0 V 5 K Ω to 1 M Ω VCC ≥ 3.
0 V 1 K Ω to 1 M Ω All inputs are equipped with protection circuits PIN CONNECTIONS (top view) NC = No Internal Connection October 1993 1/14 M54/M74HC123/123A SYSTEM DIAGRA...

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