HD74HC123A

HD74HC123A Dual Retriggerable Monostable Multivibrators (with Clear) Description This 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 HD74HC123A can be triggered on the positive transition of the clear while A is held low and B is held high. The HD74HC123A 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. The output pulse equation is simply: t w = (Rext) (Cext). Features High Speed Operation High Output Current: Fanout of 10 LSTTL Loads Wide Operating Voltage: VCC = 2 to 6 V Low Input Current: 1 µA max Low Quiescent Supply Current Function Table Inputs Clear L X X H H L A X H X L H H B X X L Outputs Q L L L Q H H H Note: External timing capacitance connects between Cext and Rext/Cext. HD74HC123A Pin Arrangement 1A 1B 1CLR 1Q 2Q 2Cext 2Rext/ Cext GND 1 2 3 4 5 6 7 8 (Top view) Q Q CLR CLR Q 16 VCC 15 1Rext Cext Q 14 1Cext 13 1Q 12 2Q 11 2CLR 10 2B 9 2A 2 HD74HC123A DC Characteristics SymItem Input voltage bol VIH VCC (V) 2.0 4.5 6.0 VIL 2.0 4.5 6.0 Output voltage VOH 2.0 4.5 6.0 4.5 6.0 VOL 2.0 4.5 6.0 4.5 6.0 Input current Quiescent supply current Standby state Active state Iin ICC 6.0 6.0 Ta = 25°C Ta = –40 to +85°C Min Typ Max Min Max Unit Test Condition...