74LV123DB NRND

Dual retriggerable monostable multivibrator with reset

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).
  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.
  3. Alternatively, an output delay can be terminated at any time by a LOW-going edge on input nRD, which also inhibits the triggering.

Schmitt-trigger action in the nA and nB inputs makes the circuit highly tolerant of slower input rise and fall times.

Not recommended for new designs (NRND), click here for the alternative product.

Orderable parts

Type number Orderable part number Ordering code (12NC) Package Buy from distributors
74LV123DB 74LV123DB,118 935210260118 SOT338-1 Order product
74LV123DB 74LV123DB,112 935210260112 SOT338-1 Order product

Features

  • 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 ℃
  • Typical HIGH-level output voltage (VOH) undershoot: > 2 V at VCC = 3.3 V and Tamb = 25 ℃
  • 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

Target applications

Parametrics

Type numberProduct statusVCC (V)Logic switching levelsOutput drive capability (mA)tpd (ns)Power dissipation considerationsTamb (°C)Rth(j-a) (K/W)Ψth(j-top) (K/W)Package name
74LV123DB
NRND
Not for design in1.0 - 5.5TTL+/- 1220low-40~12514842.0SSOP16

Package

Type numberOrderable part number, (Ordering code (12NC))StatusMarkingPackageOutline versionReflow-/Wave solderingPacking
74LV123DB
NRND
74LV123DB,118
( 9352 102 60118 )
ActiveLV123
SSOP16
(SOT338-1)
SOT338-1SSOP-TSSOP-VSO-REFLOW
SSOP-TSSOP-VSO-WAVE
Reel 13" Q1/T1

Quality, reliability & chemical content

Type numberOrderable part numberChemical contentRoHS / RHFMSLMSL leadfree
74LV123DB
NRND
74LV123DB,11874LV123DB11
Quality and reliability disclaimer

Documentation (5)

File nameTitleTypeDate
74LV123Dual retriggerable monostable multivibrator with resetData sheet2017-03-17
lvlv Spice modelSPICE model2013-05-06
SSOP-TSSOP-VSO-WAVEFootprint for wave solderingWave soldering2009-10-08
SSOP-TSSOP-VSO-REFLOWFootprint for reflow solderingReflow soldering2009-10-08
SOT338-1plastic, shrink small outline package; 16 leads; 0.65 mm pitch; 6.2 mm x 5.3 mm x 2 mm bodyOutline drawing2018-10-18

Support

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Models

File nameTitleTypeDate
lvlv Spice modelSPICE model2013-05-06

Ordering, pricing & availability

Type numberOrderable part numberOrdering code (12NC)PackingBuy online
74LV123DB74LV123DB,118935210260118Reel 13" Q1/T1Order product
74LV123DB74LV123DB,112935210260112Bulk PackOrder product

Sample

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