Product details

Number of supplies monitored 2 Features Push-button Output driver type/reset output Active-low, Open-drain Rating Catalog Operating temperature range (C) -40 to 125
Number of supplies monitored 2 Features Push-button Output driver type/reset output Active-low, Open-drain Rating Catalog Operating temperature range (C) -40 to 125
USON (DRY) 6 1 mm² 1.5 x 1
  • Very Small Package: 1.45-mm × 1.00-mm SON
  • Operating Range: 1.6 V to 6.5 V
  • Single (TPS3422) or Dual (TPS3420 and
    TPS3421) Push-Button Inputs
  • Low Supply Current: 250 nA (Typical)
  • Two-State Logic, User-Selectable Input Delay:
    • For Example: 7.5 s and 0 s
    • Multiple Timing Options Available
  • Fixed Time-out Pulse at RST (TPS3421 and
    TPS3422): 400 ms (Typical)
    • Other Timing Options Available on Request
  • Active Low, Open-Drain Output
  • Very Small Package: 1.45-mm × 1.00-mm SON
  • Operating Range: 1.6 V to 6.5 V
  • Single (TPS3422) or Dual (TPS3420 and
    TPS3421) Push-Button Inputs
  • Low Supply Current: 250 nA (Typical)
  • Two-State Logic, User-Selectable Input Delay:
    • For Example: 7.5 s and 0 s
    • Multiple Timing Options Available
  • Fixed Time-out Pulse at RST (TPS3421 and
    TPS3422): 400 ms (Typical)
    • Other Timing Options Available on Request
  • Active Low, Open-Drain Output

The TPS3420, TPS3421, and TPS3422 (TPS342x) are low-current, ultrasmall, push-button reset timers. These devices use a long timing setup delay to provide the intended system reset, and avoid resets from short push-button closures or key presses. This reset configuration also allows for differentiation between software interrupts and hard system resets.

The TPS3420 and TPS3421 monitor two inputs (PB1 and PB2) and output an active-low reset pulse signal (RST) when both inputs are low for the selected time delay. For the TPS3421, RST remains low for a factory-programmed fixed time. For the TPS3420, RST remains low until one of the PBx inputs is released. The need for a dedicated reset button is eliminated because two inputs are used to ensure reset. The TPS3422 monitors one input (PB1) and outputs an active-low reset pulse signal (RST) when PB1 is low for the selected time delay.

The TPS342x have an open-drain output that can be wire-ORed with other open-drain devices. The TPS342x operate from 1.6 V to 6.5 V over the –40°C to +125°C temperature range, and provide a precise, space-conscious micropower solution for system resetting needs.

The TPS3420, TPS3421, and TPS3422 (TPS342x) are low-current, ultrasmall, push-button reset timers. These devices use a long timing setup delay to provide the intended system reset, and avoid resets from short push-button closures or key presses. This reset configuration also allows for differentiation between software interrupts and hard system resets.

The TPS3420 and TPS3421 monitor two inputs (PB1 and PB2) and output an active-low reset pulse signal (RST) when both inputs are low for the selected time delay. For the TPS3421, RST remains low for a factory-programmed fixed time. For the TPS3420, RST remains low until one of the PBx inputs is released. The need for a dedicated reset button is eliminated because two inputs are used to ensure reset. The TPS3422 monitors one input (PB1) and outputs an active-low reset pulse signal (RST) when PB1 is low for the selected time delay.

The TPS342x have an open-drain output that can be wire-ORed with other open-drain devices. The TPS342x operate from 1.6 V to 6.5 V over the –40°C to +125°C temperature range, and provide a precise, space-conscious micropower solution for system resetting needs.

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Technical documentation

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Type Title Date
* Data sheet TPS342x Low-Power, Push-Button Controllers With Configurable Delay datasheet (Rev. B) 02 Sep 2014
Technical article 3 quiescent-current (Iq) specifications you need to understand 12 Nov 2021
Selection guide Voltage Supervisors (Reset ICs) Quick Reference Guide (Rev. H) 28 Feb 2020
E-book Voltage Supervisor and Reset ICs: Tips, Tricks and Basics 28 Jun 2019
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
Technical article Why is your wearable so small but does so much? 23 Jan 2015
Technical article No! Not that button! 10 Jun 2013
User guide TPS3421EGEVM-156 Evaluation Module 12 Sep 2012

Design & development

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Evaluation board

TPS3421EGEVM-156 — TPS3421EG Evaluation Module

The Texas Instruments TPS3421EGEVM-156 evaluation module (EVM) helps designers evaluate the performance of the TPS3421 Dual Channel Push Button Reset Timer. The TPS3421 is a low-current, ultra-small, push-button controller IC. The device uses a long timing setup delay to provide the intended (...)
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Simulation model

TPS3421EC Unencrypted PSpice Transient Model Package (Rev. A)

SBVM283A.ZIP (44 KB) - PSpice Model
Simulation model

TPS3421EG Unencrypted PSpice Transient Model Package (Rev. A)

SBVM284A.ZIP (46 KB) - PSpice Model
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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SON (DRY) 6 View options

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