MM74HC123A Monostable Multivibrator Datasheet

MM74HC123A Datasheet, PDF, Equivalent


Part Number

MM74HC123A

Description

Dual Retriggerable Monostable Multivibrator

Manufacture

Fairchild

Total Page 9 Pages
Datasheet
Download MM74HC123A Datasheet


MM74HC123A
September 1983
Revised February 1999
MM74HC123A
Dual Retriggerable Monostable Multivibrator
General Description
The MM74HC123A 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 MM74HC123A
can be triggered on the positive transition of the clear while
A is held LOW and B is held HIGH.
The MM74HC123A is retriggerable. That is it may be trig-
gered 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 = (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: 25 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 and fall times.
Ordering Code:
Order Number Package Number
Package Description
MM74HC123AM
M16A
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150” Narrow
MM74HC123ASJ
M16D
16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
MM74HC123AMTC
MTC16
16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
MM74HC123AN
N16E
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram
Timing Component
Pin Assignment for DIP, SOIC, SOP and TSSOP
Note: Pin 6 and Pin 14 must be hard-wired to GND.
Top View
© 1999 Fairchild Semiconductor Corporation DS005206.prf
www.fairchildsemi.com

MM74HC123A
Truth Table
H = HIGH Level
L = LOW Level
↑ = Transition from LOW-to-HIGH
↓ = Transition from HIGH-to-LOW
= One HIGH Level Pulse
= One LOW Level Pulse
X = Irrelevant
Logic Diagram
Inputs
Clear A
LX
XH
XX
HL
H
L
B
X
X
L
H
H
Outputs
QQ
LH
LH
L H
www.fairchildsemi.com
2


Features MM74HC123A Dual Retriggerable Monostable Multivibrator September 1983 Revised February 1999 MM74HC123A Dual Retrigge rable Monostable Multivibrator General Description The MM74HC123A high speed m onostable multivibrators (one shots) ut ilize advanced silicon-gate CMOS techno logy. They feature speeds comparable to low power Schottky TTL circuitry while retaining the low power and high noise immunity characteristic of CMOS circui ts. Each multivibrator features both a negative, A, and a positive, B, transit ion triggered input, either of which ca n be used as an inhibit input. Also inc luded is a clear input that when taken low resets the one shot. The MM74HC123A can be triggered on the positive trans ition of the clear while A is held LOW and B is held HIGH. The MM74HC123A is r etriggerable. That is it may be trigger ed repeatedly while their outputs are g enerating a pulse and the pulse will be extended. Pulse width stability over a wide range of temperature and supply is achieved using linear .
Keywords MM74HC123A, datasheet, pdf, Fairchild, Dual, Retriggerable, Monostable, Multivibrator, M74HC123A, 74HC123A, 4HC123A, MM74HC123, MM74HC12, MM74HC1, Equivalent, stock, pinout, distributor, price, schematic, inventory, databook, Electronic, Components, Parameters, parts, cross reference, chip, Semiconductor, circuit, Electric, manual, substitute




@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site (Privacy Policy & Contact)