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74VHC221ASJ Datasheet(PDF) 1 Page - Fairchild Semiconductor |
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74VHC221ASJ Datasheet(HTML) 1 Page - Fairchild Semiconductor |
1 / 9 page April 1994 Revised May 1999 © 1999 Fairchild Semiconductor Corporation DS011680.prf www.fairchildsemi.com 74VHC221A Dual Non-Retriggerable Monostable Multivibrator 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 maintaining the CMOS low power dissipation. Each 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 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, 5 kΩ 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 volt- age. This device can be used to interface 5V to 3V systems and two supply systems such as battery back up. This cir- cuit prevents device destruction due to mismatched supply and input voltages. Features s High Speed: tPD = 8.1 ns (typ) at VCC = 5V s Low Power Dissipation: ICC = 4 µA (Max) at TA = 25°C s Active State: ICC = 600 µA (Max) at TA = 25°C s High Noise Immunity: VNIH = VNIL = 28% VCC (min) s Power down protection is provided on all inputs s Pin and function compatible with 74HC221A Ordering Code: Surface mount packages are also available on Tape and Reel. Specify by appending the suffix letter “X” to the ordering code. Logic Symbol IEEE/IEC Connection Diagram 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 74VHC221AN N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide |
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