|Description||Dual Monostable Multivibrators (with Schmitt Trigger Input)|
|74221 Datasheet PDF : 9 Pages |
Revised February 1999
Dual Non-Retriggerable Monostable Multivibrator
The MM74HC221A high speed monostable multivibrators
(one shots) utilize advanced silicon-gate CMOS technol-
ogy. They feature speeds comparable to low power Schot-
tky TTL circuitry while retaining the low power and high
noise immunity characteristic of CMOS circuits.
Each multivibrator features both a negative, A, and a posi-
tive, 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 out-
put pulse equation is simply: PW = (REXT) (CEXT); where
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.
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
Order Number Package Number
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 also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Pin Assignments for DIP, SOIC, SOP and TSSOP
Note: Pin 6 and Pin 14 must be hard-wired to GND.
© 1999 Fairchild Semiconductor Corporation DS005325.prf
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