Datasheet > UM809BS

UM809BS

更新时间： 2024-10-31 00:28:59

品牌	Logo	应用领域
英联电子 - UNIONSEMI		/
页数	文件大小	规格书
14页	408K
描述
3-Pin Microprocessor Reset Circuits

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UM809BS 数据手册

UM809/810

3-Pin Microprocessor Reset Circuits

UM809/810 SOT323/SOT23-3

General Description

The UM809/810 series are ultra low current, cost effective system supervisory circuits designed to

monitor the power supplies in digital systems. They provide a reset signal to the host processor

when necessary, offer excellent circuit reliability & low cost by eliminating external component

and adjustment when used with +5V, +3.3V, +3.0V or other voltage powered circuits.

The reset output is driven active within 10µs of power supply falling through the reset voltage

threshold. Reset is keeping active for a minimum of 140ms after system power supply has risen

above the reset threshold. Reset threshold suitable for operation with variety of supply voltage are

available.

UM809 has an active-low reset output while UM810 has an active-high reset output. The

UM809/810 are optimized to reject fast transient glitches on the power supply line, and the reset

output are guaranteed to be in the correct logic state for power supply V_CCdown to 1V.

Each of these ICs consists of a voltage reference comparator, resistors for detector threshold

setting, delay generator, output driver & hysteresis circuit. The reset threshold & time delay are

fixed with high accuracy internally and does not require any external adjustment.

Low supply current of 3µA (V_CC=3V) makes UM809/810 ideal for low power application. Both

devices are available in 3 Pin SOT323 or SOT23 packages.

Applications

Features



CPU and Logic Circuit Reset

Power Fail Detectors

Computers

Embedded Systems

Battery-Powered Equipments

Intelligent Instruments



Wide Operation Voltage Range of 1V to 10V

Typical Quiescent Current of 3μA

No External Components

3-Pin Small SOT323 and SOT23 Packages

V_CCTransient Immunity

Correct Logic Output Guaranteed to V_CC=1.0V

Precision V_CCMonitor for 2.5V, 3.0V, 3.3V,

and 5.0V Supplies



Available in 2 Output Configurations

Push-Pull Low Active Reset Output (UM809)

Push-Pull High Active Reset Output (UM810)

Wide Operation Temperature: -40°C to +85°C

Pin Configurations

Top View

GND 1

XXX

3 VCC

RESET 2

(RESET)*

Marking Pin1

M: Month Code

UM809/810

( )* for UM810

SOT323/SOT23-3

________________________________________________________________________

http://www.union-ic.com Rev.06 Apr.2015 1/14

12 3 4 5 6 7...14

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