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74221

Fairchild Semiconductor
Part Number 74221
Manufacturer Fairchild Semiconductor
Description Dual Non-Retriggerable Monostable Multivibrator
Published Apr 3, 2005
Detailed Description MM74HC221A Dual Non-Retriggerable Monostable Multivibrator September 1983 Revised February 1999 MM74HC221A Dual Non-Re...
Datasheet PDF File 74221 PDF File

74221
74221

Overview
MM74HC221A Dual Non-Retriggerable Monostable Multivibrator September 1983 Revised February 1999 MM74HC221A Dual Non-Retriggerable Monostable Multivibrator General Description The MM74HC221A high speed monostable multivibrators (one shots) utilize advanced silicon-gate CMOS technology.
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 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 MM74HC221A can be triggered on the positive transition of the clear while A is held LOW and B is held HIGH.
The MM74HC221A is a non-retriggerable, and therefore cannot be retriggered until the output pulse times out.
Pulse width stability over a wide range of temperature and supply is achieved using linear CMOS techniques.
The output pulse equation is simply: PW = (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 s Typical propagation delay: 40 ns s Wide power supply range: 2V–6V s Low quiescent current: 80 µA maximum (74HC Series) s Low input current: 1 µA maximum s Fanout of 10 LS-TTL loads s Simple pulse width formula T = RC s Wide pulse range: 400 ns to ∞ (typ) s Part to part variation: ±5% (typ) s Schmitt Trigger A & B inputs enable infinite signal input rise or fall times Ordering Code: Order Number MM74HC221AM MM74HC221ASJ MM74HC221AMTC MM74HC221AN Package Number M16A M16D MTC16 N16E Package Description 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.
150” Narrow 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.
3mm Wide 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.
4mm Wide 16-Lead Plastic Dual-In-Line Package (PDIP), MS-001, 0.
300” Wide Devices a...


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