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This literature is subject to all applicable copyright laws and is not for resale in any manner.74VHC123A Dual Retriggerable Monostable Multivibrator May 2007 74VHC123A tm Dual Retriggerable Monostable Multivibrator Features General Description High Speed: t = 8.1ns (Typ.) at T = 25C The VHC123A is an advanced high speed CMOS PD A Monostable Multivibrator fabricated with silicon gate Low Power Dissipation: I = 4A (Max) at T = 25C CC A CMOS technology. It achieves the high speed operation Active State: I = 600A (Max.) at T = 25C CC A similar to equivalent Bipolar Schottky TTL while main- High Noise Immunity: V = V = 28% V (Min.) NIH NIL CC taining the CMOS low power dissipation. Each multi- Power down protection is provided on all inputs vibrator features both a negative, A, and a positive, B, Pin and function compatible with 74HC123A 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 VHC123A can be triggered on the positive transition of the clear while A is held low and B is held high. The output pulse width is determined by the equation: PW = (R )(C ) where PW x x is in seconds, R is in ohms, and C is in farads. Limits for R and C are: x x External capacitor, C : No limit x External resistors, R:V = 2.0V, 5 k min x CC V > 3.0V, 1 k min CC An input protection circuit ensures that 0 to 7V can be applied to the input pins without regard to the supply voltage. This device can be used to interface 5V to 3V systems and two supply systems such as battery back up. This circuit prevents device destruction due to mis- matched supply and input voltages. Ordering Information Package Order Number Number Package Description 74VHC123AM M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow 74VHC123ASJ M16D 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide 74VHC123AMTC MTC16 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide Surface mount packages are also available on Tape and Reel. Specify by appending the suffix letter X to the ordering number. 1993 Fairchild Semiconductor Corporation www.fairchildsemi.com 74VHC123A Rev. 1.2