74HC4538
器件描述：Dual Retriggerable Monostable Multivibrator
器件厂商：FAIRCHILD [Fairchild Semiconductor]
文件大小：119.29KB，共10页
Sponsor by e络盟器件资料摘要：
© 2000 Fairchild Semiconductor Corporation DS005217 www.fairchildsemi.com
February 1984
Revised August 2000
MM74HC4538 Dual Retr
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Monost
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MM74HC4538
Dual Retriggerable Monostable Multivibrator
General Description
The MM74HC4538 high speed monostable multivibrator
(one shots) is implemented in 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 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 MM74HC4538 is
retriggerable. That is, it may be triggered repeatedly while
their outputs are generating a pulse and the pulse will be
extended.
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 = 0.7(R)(C) where PW is
in seconds, R is in ohms, and C is in farads. This device is
pin compatible with the CD4528, and the CD4538 one
shots. All inputs are protected from damage due to static
discharge by diodes to V
CC
and ground.
Features
a73 Schmitt trigger on A and B inputs
a73 Wide power supply range: 2–6V
a73 Typical trigger propagation delay: 32 ns
a73 Fanout of 10 LS-TTL loads
a73 Low input current: 1 µA max
Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram Truth Table
H = HIGH Level
L = LOW Level
↑ = Transition from LOW-to-HIGH
↓ = Transition from HIGH-to-LOW
c12 = One HIGH Level Pulse
c13 = One LOW Level Pulse
X = Irrelevant
Order Number Package Number Package Description
MM74HC4538M M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
MM74HC4538SJ M16D 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
MM74HC4538N N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Inputs Outputs
Clear A B Q Q
LXXLH
XHXLH
XXLLH
HL↓ c12c13
H ↑ H c12c13
February 1984
Revised August 2000
MM74HC4538 Dual Retr
igg
e
rabl
e
Monost
a
bl
e
Mul
t
i
v
ibr
a
tor
MM74HC4538
Dual Retriggerable Monostable Multivibrator
General Description
The MM74HC4538 high speed monostable multivibrator
(one shots) is implemented in 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 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 MM74HC4538 is
retriggerable. That is, it may be triggered repeatedly while
their outputs are generating a pulse and the pulse will be
extended.
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 = 0.7(R)(C) where PW is
in seconds, R is in ohms, and C is in farads. This device is
pin compatible with the CD4528, and the CD4538 one
shots. All inputs are protected from damage due to static
discharge by diodes to V
CC
and ground.
Features
a73 Schmitt trigger on A and B inputs
a73 Wide power supply range: 2–6V
a73 Typical trigger propagation delay: 32 ns
a73 Fanout of 10 LS-TTL loads
a73 Low input current: 1 µA max
Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram Truth Table
H = HIGH Level
L = LOW Level
↑ = Transition from LOW-to-HIGH
↓ = Transition from HIGH-to-LOW
c12 = One HIGH Level Pulse
c13 = One LOW Level Pulse
X = Irrelevant
Order Number Package Number Package Description
MM74HC4538M M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
MM74HC4538SJ M16D 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
MM74HC4538N N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Inputs Outputs
Clear A B Q Q
LXXLH
XHXLH
XXLLH
HL↓ c12c13
H ↑ H c12c13