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NXP Semiconductors Electronic Components Datasheet

74AHC123A Datasheet

Dual retriggerable monostable multivibrator with reset

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INTEGRATED CIRCUITS
DATA SHEET
74AHC123A; 74AHCT123A
Dual retriggerable monostable
multivibrator with reset
Product specification
File under Integrated Circuits, IC06
2000 Mar 15


NXP Semiconductors Electronic Components Datasheet

74AHC123A Datasheet

Dual retriggerable monostable multivibrator with reset

No Preview Available !

Philips Semiconductors
Dual retriggerable monostable multivibrator
with reset
Product specification
74AHC123A;
74AHCT123A
FEATURES
ESD protection:
HBM EIA/JESD22-A114-A exceeds 2000 V
MM EIA/JESD22-A115-A exceeds 200 V
CDM EIA/JESD22-C101 exceeds 1000 V
All inputs have Schmitt-trigger actions
Inputs accept voltages higher than VCC
For AHC only: operates with CMOS input levels
For AHCT only: operates with TTL input levels
Specified from 40 to +85 °C and 40 to +125 °C
DC triggered from active HIGH or active LOW inputs
Retriggerable for very long pulses up to 100% duty
factor
Direct reset terminates output pulse
Output capability: standard (except for nREXT/CEXT).
DESCRIPTION
The 74AHC/AHCT123A are high-speed Si-gate CMOS
devices and are pin compatible with Low power Schottky
TTL (LSTTL). They are specified in compliance with
JEDEC standard no.7A.
The 74AHC/AHCT123A are dual retriggerable monostable
multivibrators with output pulse width control by three
methods. The basic pulse time is programmed by
selection of an external resistor (REXT) and capacitor
(CEXT). The external resistor and capacitor are normally
connected as shown in Fig.6.
Once triggered, the basic output pulse width may be
extended by retriggering the gated active LOW-going edge
input (nA) or the active HIGH-going edge input (nB).
By repeating this process, the output pulse period
(nQ = HIGH, nQ = LOW) can be made as long as desired.
Alternatively an output delay can be terminated at any time
by a LOW-going edge on input nRD, which also inhibits the
triggering.
An internal connection from nRD to the input gate makes it
possible to trigger the circuit by a positive-going signal at
input nRD as shown in the function table. Figs 8 and 9
illustrate pulse control by retriggering and early reset. The
basic output pulse width is essentially determined by the
value of the external timing components REXT and CEXT.
When CEXT 10 nF, the typical output pulse width is
defined as: tW = REXT × CEXT where tW = pulse width in ns;
REXT = external resistor in k; CEXT = external capacitor
in pF. Schmitt-trigger action at all inputs makes the circuit
highly tolerant to slower input rise and fall times. The ‘123’
is identical to the ‘423’ but can be triggered via the reset
input.
2000 Mar 15
2


Part Number 74AHC123A
Description Dual retriggerable monostable multivibrator with reset
Maker NXP
Total Page 24 Pages
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