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MM54HC123A Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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MM54HC123A Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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TLF5206 January 1988 MM54HC123AMM74HC123A Dual Retriggerable Monostable Multivibrator General Description The MM5474HC123A 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- 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 TriggerAB inputs enable infinite signal input rise and fall times Connection Diagram Dual-In-Line Package TLF5206 – 1 Top View Order Number MM54HC123A or MM74HC123A Timing Component TLF5206 – 2 Note Pin 6 and Pin 14 must be hard-wired to GND Truth Table Inputs Outputs Clear AB Q Q LX X L H XH X L H XX L L H HL u H v H u 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 RRD-B30M105Printed in U S A |
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