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TPS3808 - Programmable-Delay Supervisory Circuit

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General Description

The TPS3808 family of microprocessor supervisory circuits monitors system voltages from 0.4 V to 5 V, asserting an open-drain RESET signal when the SENSE voltage drops below a preset threshold or when the manual reset ( MR) pin drops to a logic low.

The RESET output remains low for the user-adjustable delay time after the SENSE voltage and manual reset ( MR) return above the respective thresholds.

The TPS3808 device uses a precision reference to achieve 0.5% threshold accuracy for VIT ≤ 3.3 V.

Overview

TPS3808 SBVS050M – MAY 2004 – REVISED MARCH 2023 TPS3808 Low-Quiescent-Current, Programmable-Delay Supervisory Circuit.

Key Features

  • Power-on reset generator with adjustable delay time: 1.25 ms to 10 s.
  • Very low quiescent current: 2.4 μA typical.
  • High threshold accuracy: 0.5% typical.
  • Fixed threshold voltages for standard voltage rails from 0.9 V to 5 V and adjustable voltage down to 0.4 V are available.
  • Manual reset ( MR) input.
  • Open-drain RESET output.
  • Temperature range:.
  • 40°C to 125°C.
  • Small SOT-23 and 2-mm × 2-mm WSON packages 2.

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