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CAT823RTDI-GT3

Microprocessor reset IC, 3.08V threshold, push-pull, SOT-23-5

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Manufacturer Part：

CAT823RTDI-GT3

Package：

SOT-23-5 (2.9x1.6mm)

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Description

Product Overview

The CAT823RTDI-GT3 from onsemi is a microprocessor supervisory reset IC with 3.08V threshold, 200ms reset timeout, push-pull active-high reset output in SOT-23-5 for MCU brownout detection.

Key Specifications

Threshold 3.08V
Reset Output Push-pull active-high
Timeout 200ms min
Supply 1.0-5.5V
Iq 5uA typ
Temp -40~85C

Features

  • Precision 3.08V threshold
  • 200ms reset timeout
  • Push-pull active-high output
  • 5uA low supply current
  • Manual reset input

Applications

  • MCU supervisory circuits
  • Brownout detection
  • Power-on reset
  • Embedded systems
  • FPGA/CPU monitoring

The CAT823RTDI-GT3 from onsemi is a microprocessor supervisory reset IC with 3.08V threshold, 200ms reset timeout, push-pull active-high reset output in SOT-23-5 for MCU brownout detection.

The CAT823RTDI-GT3 is a microprocessor reset IC from onsemi in SOT-23-5 with a 3.08V reset threshold and push-pull active-LOW output. It monitors the VCC supply voltage: when VCC drops below 3.08V (the reset threshold for the R suffix), the RESET output immediately goes LOW, holding the MCU in reset. When VCC rises above the threshold, the internal timer starts a 140ms (typical) reset timeout before releasing RESET HIGH, ensuring the supply and oscillator are stable before the MCU starts executing code. The MR (Manual Reset) pin allows an external push-button or logic signal to trigger a reset: pulling MR below 0.4V activates RESET LOW for as long as MR is held LOW plus the 140ms timeout after MR is released. The internal pull-up resistor (approximately 30k-ohm) on MR means it can be left floating if manual reset is not needed. The push-pull output (TDI suffix) actively drives both HIGH and LOW, unlike open-drain versions that require an external pull-up resistor. The T suffix in RTDI specifies the 3.08V threshold. Operating current is only 5uA at 3.3V, making it suitable for battery-powered applications. The device operates from 1.0V to 5.5V, with valid RESET output guaranteed down to VCC=1.0V. The -GT3 suffix denotes tape-and-reel, automotive grade.

Pin Name Type Function
1 MR Input Manual reset input (active low, internal pull-up)
2 VSS Power Ground
3 RESET Output Active-low reset output (push-pull)
4 NC – No connect
5 VCC Power Supply (1.0-5.5V)
  • MCU supervisory circuits
  • Brownout detection
  • Power-on reset
  • Embedded systems
  • FPGA/CPU monitoring
    • Manufacturer Part Number Package Notes
    onsemi CAT823ZTDI-GT3 SOT-23-5 Same device, open-drain reset output
    Texas Instruments TPS3839K33DBVR SOT-23-5 3.3V reset IC, 150nA Iq, push-pull
    Maxim MAX809STRG+T SOT-23-5 3.08V reset IC, push-pull, 240ms timeout
    Analog Devices ADM803RARTZ-REEL7 SOT-23-5 2.93V reset IC, push-pull
    STMicroelectronics STM809SWX6F SC-70-3 2.93V reset IC, minimal footprint
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