MM74HC221AMX ,Dual Non-Retriggerable Monostable Multivibratorfeatures both a negative, A, and a posi-
MM74HC221AM-MM74HC221AMX-MM74HC221AN
Dual Non-Retriggerable Monostable Multivibrator
MM74HC221A Dual Non-Retriggerable Monostable Multivibrator September 1983 Revised January 2004 MM74HC221A Dual Non-Retriggerable Monostable Multivibrator General Description Features The MM74HC221A high speed monostable multivibratorsTypical propagation delay: 40 ns (one shots) utilize advanced silicon-gate CMOS technol-Wide power supply range: 2V–6V ogy. They feature speeds comparable to low power Schot- Low quiescent current: 80 μA maximum (74HC Series) tky TTL circuitry while retaining the low power and high Low input current: 1 μA maximum noise immunity characteristic of CMOS circuits. Fanout of 10 LS-TTL loads Each multivibrator features both a negative, A, and a posi- Simple pulse width formula T = RC tive, B, transition triggered input, either of which can be used as an inhibit input. Also included is a clear input thatWide pulse range: 400 ns to ∞ (typ) when taken low resets the one shot. The MM74HC221A Part to part variation: ±5% (typ) can be triggered on the positive transition of the clear while Schmitt Trigger A & B inputs enable infinite signal input A is held LOW and B is held HIGH. rise or fall times 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 out- put pulse equation is simply: PW = (R ) (C ); where EXT EXT 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 V and ground. CC Ordering Code: Order Number Package Number Package Description MM74HC221AM M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow (Note 1) MM74HC221ASJ M16D 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide MM74HC221AN N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide Note 1: Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code. Connection Diagrams Timing Component Top View Note: Pin 6 and Pin 14 must be hard-wired to GND. © 2004 DS005325
