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74LV123BQ Datasheet Preview

74LV123BQ Datasheet

Dual retriggerable monostable multivibrator

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74LV123
Dual retriggerable monostable multivibrator with reset
Rev. 8 — 4 March 2016
Product data sheet
1. General description
The 74LV123 is a low-voltage Si-gate CMOS device and is pin and function compatible
with the 74HC123; 74HCT123. It is a dual retriggerable monostable multivibrator which
uses three methods to control the output pulse width:
1. The basic pulse time is programmed by the selection of an external resistor (REXT)
and capacitor (CEXT). These are normally connected as shown in Figure 9.
2. 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 (see Figure 12).
3. Alternatively, an output delay can be terminated at any time by a LOW-going edge on
input nRD, which also inhibits the triggering (see Figure 13).
Schmitt-trigger action in the nA and nB inputs makes the circuit highly tolerant of slower
input rise and fall times.
2. Features and benefits
Optimized for low-voltage applications: 1.0 V to 5.5 V
Accepts TTL input levels between VCC = 2.7 V and VCC = 3.6 V
Typical output ground bounce: < 0.8 V at VCC = 3.3 V and Tamb = 25 C
Typical HIGH-level output voltage (VOH) undershoot: > 2 V at VCC = 3.3 V and
Tamb = 25 C
DC triggered from active HIGH or active LOW inputs
Retriggerable for very long pulses up to 100 % duty factor
Direct reset terminates output pulses
Schmitt-trigger action on all inputs except for the reset input




nexperia

74LV123BQ Datasheet Preview

74LV123BQ Datasheet

Dual retriggerable monostable multivibrator

No Preview Available !

Nexperia
74LV123
Dual retriggerable monostable multivibrator with reset
3. Ordering information
Table 1. Ordering information
Type number Package
Temperature range Name
Description
Version
74LV123D
40 C to +125 C SO16
plastic small outline package; 16 leads; body width
3.9 mm
SOT109-1
74LV123DB 40 C to +125 C SSOP16
plastic shrink small outline package; 16 leads; body width SOT338-1
5.3 mm
74LV123PW 40 C to +125 C TSSOP16 plastic thin shrink small outline package; 16 leads; body SOT403-1
width 4.4 mm
74LV123BQ
40 C to +125 C
DHVQFN16 plastic dual in-line compatible thermal enhanced very thin SOT763-1
quad flat package; no leads; 16 terminals;
body 2.5 3.5 0.85 mm
4. Functional diagram
$ 
$ 
% 
% 
6
4
7
4
5'
 &(;7
 &(;7
 5(;7&(;7
 5(;7&(;7
 4
 4
 4
 4
5' 
5' 
Fig 1. Logic symbol
DDH

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5&;





5

&;

5&;





5
DDH
Fig 2. IEC logic symbol
74LV123
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 8 — 4 March 2016
© Nexperia B.V. 2017. All rights reserved
2 of 23


Part Number 74LV123BQ
Description Dual retriggerable monostable multivibrator
Maker nexperia
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