Product details


Number of supplies monitored 1 Features Push-button Output driver type/reset output Active-low, Open-drain Rating Catalog Operating temperature range (C) -40 to 125 open-in-new Find other Supervisor & reset ICs

Package | Pins | Size

USON (DRY) 6 1 mm² 1.5 x 1 open-in-new Find other Supervisor & reset ICs


  • 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
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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) Sep. 02, 2014
Application note Programmable Push-Button, Pulse Detector, and Pulse Generator Solutions Mar. 10, 2020
Selection guide Voltage Supervisors (Reset ICs) Quick Reference Guide (Rev. H) Feb. 28, 2020
E-book Voltage Supervisor and Reset ICs: Tips, Tricks and Basics Jun. 28, 2019
Selection guide Power Management Guide 2018 (Rev. R) Jun. 25, 2018
Technical article No! Not that button! Jun. 10, 2013
User guide TPS3421EGEVM-156 Evaluation Module Sep. 12, 2012

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

TPS3421EG Evaluation Module
document-generic User guide
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 system (...)
  • Very Small 1.45mm x 1mm SON package
  • Dual Push Button Inputs
  • User selectable delay: 0s, 4s, 7.5s
  • Low supply current: 500nA
  • Fixed timeout pulse at /RST: 400ms
  • Active-low, open-drain output

Design tools & simulation

SBVM285A.ZIP (159 KB) - PSpice Model
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — 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 (...)
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)

Reference designs

Wireless IoT, Bluetooth® Low Energy, 4½ Digit, 100kHz True RMS Digital Multimeter
TIDA-01012 — Many products are now becoming connected through the Internet of Things (IoT), including test equipment such as digital multimeters (DMM).  Enabled by Texas Instruments’ SimpleLink™ ultra-low power wireless microcontroller (MCU) platform, the TIDA-01012 reference design demonstrates (...)
document-generic Schematic
Enhanced Accuracy Battery Fuel Gauge Reference Design for Low Power Industrial IoT Field Metering
TIDA-01014 The Internet of Things (IoT) revolution is efficiently connecting applications and instruments, enabling battery powered, wide scale very low power sensor deployment.  New technologies, such as TI’s advanced sensor and low power connectivity devices, are enabling these instruments to be (...)
document-generic Schematic

CAD/CAE symbols

Package Pins Download
SON (DRY) 6 View options

Ordering & quality

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Support & training

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