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UM821 - uP Reset Circuits

Download the UM821 datasheet PDF. This datasheet also covers the UM807 variant, as both devices belong to the same up reset circuits family and are provided as variant models within a single manufacturer datasheet.

General Description

The UM807/821/822 are low-power microprocessor (μP) supervisory circuits used to monitor power supplies in μP and digital systems.

They provide excellent circuit reliability and low cost by eliminating external components and adjustments when used with 5V-powered or 3V-powered circuits.

Key Features

  • z Set-Top Boxes z Consumer Electronics z DVD Players z Cable/DSL Modems z MP3 Players z Industrial Equipments z Automotive z Medical Devices z No External Components z VCC Transient Immunity z Correct Logic Output Guaranteed to VCC=1.0V z Precision VCC Monitoring of 3.0V, 3.3V and 5.0V Supplies z 2μA Supply Current z 140ms Minimum Power-On Reset Pulse Width z Available in 3 Manual Reset Setup Periods (tMR): A: 10.08s B: 6.72s C: 1.68s z Available in 3 Output Con_f__i_g__u__r_a__t_i_ons: Open-D.

📥 Download Datasheet

Note: The manufacturer provides a single datasheet file (UM807-UnionSemiconductor.pdf) that lists specifications for multiple related part numbers.

Datasheet Details

Part number UM821
Manufacturer Union Semiconductor
File Size 322.08 KB
Description uP Reset Circuits
Datasheet download datasheet UM821 Datasheet

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Other Datasheets by Union Semiconductor

Part Number Description
UM822 uP Reset Circuits
UM803 3-Pin Microprocessor Reset Circuits
UM805 4-Pin uP Voltage Monitors
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UM809 3-Pin Microprocessor Reset Circuits

Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

View original datasheet text
UM807/821/822 μP Reset Circuits with Long Manual Reset Setup Period UM807/821/822 SOT143 General Description The UM807/821/822 are low-power microprocessor (μP) supervisory circuits used to monitor power supplies in μP and digital systems. They provide excellent circuit reliability and low cost by eliminating external components and adjustments when used with 5V-powered or 3V-powered circuits. The UM807/821/822 also provide a debounced manual reset input with long setup period. On all devices, the reset output asserts when the VCC supply voltage drops below its specified threshold. The reset output remains asserted for the reset timeout period (240ms typ) after VCC rises above the reset threshold.