Retriggerable Monostable Multivibrators

SN54LS123-SP

ACTIVE

Product details

Number of channels (#) 2 Supply voltage (Min) (V) 4.75 Supply voltage (Max) (V) 5.25 Technology Family LS Input type Bipolar Output type Push-Pull ICC (uA) 20000 IOL (Max) (mA) 4 IOH (Max) (mA) -0.4 Features Standard speed (tpd > 50ns), Retriggerable
Number of channels (#) 2 Supply voltage (Min) (V) 4.75 Supply voltage (Max) (V) 5.25 Technology Family LS Input type Bipolar Output type Push-Pull ICC (uA) 20000 IOL (Max) (mA) 4 IOH (Max) (mA) -0.4 Features Standard speed (tpd > 50ns), Retriggerable
CDIP (J) 16 135 mm² 19.65 x 6.92 CFP (W) 16 69 mm² 10 x 6.7
  • D-C Triggered from Active-High or Active-Low Gated Logic Inputs
  • Retriggerable for Very Long Output Pulses, Up to 100% Duty Cycle
  • Overriding Clear Terminates Output Pulse
  • '122 and 'LS122 Have Internal Timing Resistors
  • D-C Triggered from Active-High or Active-Low Gated Logic Inputs
  • Retriggerable for Very Long Output Pulses, Up to 100% Duty Cycle
  • Overriding Clear Terminates Output Pulse
  • '122 and 'LS122 Have Internal Timing Resistors

These d-c triggered multivibrators feature output pulse-duration control by three methods. The basic pulse time is programmed by selection of external resistance and capacitance values (see typical application data). The '122 and 'LS122 have internal timing resistors that allow the circuits to be used with only an external capacitor, if so desired. Once triggered, the basic pulse duration may be extended by retriggering the gated low-level-active (A) or high-level-active (B) inputs, or be reduced by use of the overriding clear. Figure 1 illustrates pulse control by retriggering and early clear.

The 'LS122 and 'LS123 are provided enough Schmitt hysteresis to ensure jitter-free triggering from the B input with transition rates as slow as 0.1 millivolt per nanosecond.

The Rint is nominally 10 k for '122 and 'LS122.

These d-c triggered multivibrators feature output pulse-duration control by three methods. The basic pulse time is programmed by selection of external resistance and capacitance values (see typical application data). The '122 and 'LS122 have internal timing resistors that allow the circuits to be used with only an external capacitor, if so desired. Once triggered, the basic pulse duration may be extended by retriggering the gated low-level-active (A) or high-level-active (B) inputs, or be reduced by use of the overriding clear. Figure 1 illustrates pulse control by retriggering and early clear.

The 'LS122 and 'LS123 are provided enough Schmitt hysteresis to ensure jitter-free triggering from the B input with transition rates as slow as 0.1 millivolt per nanosecond.

The Rint is nominally 10 k for '122 and 'LS122.

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Technical documentation

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Type Title Date
* Data sheet Retriggerable Monostable Multivibrators datasheet 01 Dec 1983
* SMD SN54LS123-SP SMD 5962-76039 08 Jul 2016
Selection guide TI Space Products (Rev. H) 27 Jan 2021
Application note Heavy Ion Orbital Environment Single-Event Effects Estimations 18 May 2020
Application note Designing With the SN74LVC1G123 Monostable Multivibrator (Rev. A) 13 Mar 2020
Application note Single-Event Effects Confidence Interval Calculations 14 Jan 2020
More literature TI Engineering Evaluation Units vs. MIL-PRF-38535 QML Class V Processing 17 Jun 2019
Selection guide Logic Guide (Rev. AB) 12 Jun 2017
Application note Understanding and Interpreting Standard-Logic Data Sheets (Rev. C) 02 Dec 2015
User guide LOGIC Pocket Data Book (Rev. B) 16 Jan 2007
Application note Semiconductor Packing Material Electrostatic Discharge (ESD) Protection 08 Jul 2004
More literature Logic Cross-Reference (Rev. A) 07 Oct 2003
Application note TI IBIS File Creation, Validation, and Distribution Processes 29 Aug 2002
Application note Designing With Logic (Rev. C) 01 Jun 1997
Application note Designing with the SN54/74LS123 (Rev. A) 01 Mar 1997
Application note Input and Output Characteristics of Digital Integrated Circuits 01 Oct 1996
Application note Live Insertion 01 Oct 1996

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CDIP (J) 16 View options
CFP (W) 16 View options

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