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74VHC221ASJ Datasheet(PDF) 1 Page - Fairchild Semiconductor |
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74VHC221ASJ Datasheet(HTML) 1 Page - Fairchild Semiconductor |
1 / 12 page tm May 2007 ©1994 Fairchild Semiconductor Corporation www.fairchildsemi.com 74VHC221A Rev. 1.2 74VHC221A Dual Non-Retriggerable Monostable Multivibrator Features ■ High Speed: tPD = 8.1ns (Typ.) at VCC = 5V ■ Low Power Dissipation: ICC = 4µA (Max.) at TA = 25°C ■ Active State: ICC = 600µA (Max.) at TA = 25°C ■ High Noise Immunity: VNIH = VNIL = 28% VCC (Min.) ■ Power down protection is provided on all inputs ■ Pin and function compatible with 74HC221A General Description The VHC221A is an advanced high speed CMOS Monostable Multivibrator fabricated with silicon gate CMOS technology. It achieves the high speed operation similar to equivalent Bipolar Schottky TTL while main- taining the CMOS low power dissipation. Each multi- vibrator 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 VHC221A can be triggered on the positive transition of the clear while A is held LOW and B is held HIGH. The VHC221A is non- retriggerable, and therefore cannot be retriggered until the output pulse times out. The output pulse width is determined by the equation: PW = (Rx)(Cx) where, PW is in seconds, R is in ohms, and C is in farads. Limits for Rx and Cx are: External capacitor, Cx: No limit External resistors, Rx:VCC = 2.0V, 5kΩ Min. VCC > 3.0V, 1 kΩ Min 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 Surface mount packages are also available on Tape and Reel. Specify by appending the suffix letter “X” to the ordering code. Order Number Package Number Package Description 74VHC221AM M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow 74VHC221ASJ M16D 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide 74VHC221AMTC MTC16 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide |
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