74221
器件描述：Dual Non-Retriggerable Monostable Multivibrator
器件厂商：FAIRCHILD [Fairchild Semiconductor]
文件大小：108.82KB，共9页
Sponsor by e络盟器件资料摘要：
September 1983
Revised February 1999
MM74HC221A Dual Non-Ret
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© 1999 Fairchild Semiconductor Corporation DS005325.prf www.fairchildsemi.com
MM74HC221A
Dual Non-Retriggerable Monostable Multivibrator
General Description
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 = (R
EXT
) (C
EXT
); 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 V
CC
and ground.
Features
a73 Typical propagation delay: 40 ns
a73 Wide power supply range: 2V–6V
a73 Low quiescent current: 80 µA maximum (74HC Series)
a73 Low input current: 1 µA maximum
a73 Fanout of 10 LS-TTL loads
a73 Simple pulse width formula T = RC
a73 Wide pulse range: 400 ns to ∞ (typ)
a73 Part to part variation: ±5% (typ)
a73 Schmitt Trigger A & B inputs enable infinite signal input
rise or fall times
Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagrams
Pin Assignments for DIP, SOIC, SOP and TSSOP
Top View
Timing Component
Note: Pin 6 and Pin 14 must be hard-wired to GND.
Order Number Package Number Package Description
MM74HC221AM M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150” Narrow
MM74HC221ASJ M16D 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
MM74HC221AMTC MTC16 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
MM74HC221AN N16E 16-Lead Plastic Dual-In-Line Package (PDIP), MS-001, 0.300” Wide
Revised February 1999
MM74HC221A Dual Non-Ret
r
i
ggerabl
e M
o
n
ostabl
e M
u
l
t
i
v
i
b
rat
o
r
© 1999 Fairchild Semiconductor Corporation DS005325.prf www.fairchildsemi.com
MM74HC221A
Dual Non-Retriggerable Monostable Multivibrator
General Description
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 = (R
EXT
) (C
EXT
); 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 V
CC
and ground.
Features
a73 Typical propagation delay: 40 ns
a73 Wide power supply range: 2V–6V
a73 Low quiescent current: 80 µA maximum (74HC Series)
a73 Low input current: 1 µA maximum
a73 Fanout of 10 LS-TTL loads
a73 Simple pulse width formula T = RC
a73 Wide pulse range: 400 ns to ∞ (typ)
a73 Part to part variation: ±5% (typ)
a73 Schmitt Trigger A & B inputs enable infinite signal input
rise or fall times
Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagrams
Pin Assignments for DIP, SOIC, SOP and TSSOP
Top View
Timing Component
Note: Pin 6 and Pin 14 must be hard-wired to GND.
Order Number Package Number Package Description
MM74HC221AM M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150” Narrow
MM74HC221ASJ M16D 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
MM74HC221AMTC MTC16 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
MM74HC221AN N16E 16-Lead Plastic Dual-In-Line Package (PDIP), MS-001, 0.300” Wide