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IMP809, IMP81 0

P

OWER

M

ANAGEMENT

3-Pin Microcontroller

Power Supply Supervisor

The IMP809/IMP810 are 3.0V, 3.3V and 5.0V power supply supervisor cir-

cuits optimized for low-power microprocessor (碌P), microcontroller (碌C)

and digital systems. The IMP809/810 are improved drop-in replacements

for the Maxim MAX809/810 and feature 60% lower supply current.

A reset signal is issued if the power supply voltage drops below a preset

reset threshold and is asserted for at least 140ms after the supply has

risen above the reset threshold. The IMP809 has an active-low RESET

output that is guaranteed to be in the correct state for V

CC

down to 1.1V.

The IMP810 has an active-high RESET output. The reset comparator is

designed to ignore fast transients on V

CC

.

Low supply current makes the IMP809/IMP810 ideal for use in portable

and battery operated equipment. The IMP809/IMP810 are available in a

compact 3-pin SOT23 package.

Six voltage thresholds are available to support 3V to 5V systems:

Key Features

x

Improved Maxim MAX809/MAX810 replacement

鈥?Lower supply current鈥?碌A(chǔ)

鈥?80% lower maximum supply current

x

Monitor 5V, 3.3V and 3V supplies

x

140ms min. reset pulse width

x

Active-low reset valid with 1.1V supply

(IMP809)

x

Small 3-pin SOT-23 package

x

No external components

x

Specified over full temperature range

鈥?鈥?40擄C to 105擄C

Applications

x

x

x

x

x

Embedded controllers

Battery operated systems

Intelligent instruments

Wireless communication systems

PDAs and handheld equipment

Reset Threshold

Suffix

Voltage (V)

L

M

J

T

S

R

4.63

4.38

4.00

3.08

2.93

2.63

Block Diagrams

VCC

VCC

IMP809

(IMP810)

RESET

(RESET)

GND

RESET

Input

VCC

碌P

GND

809/10_01.eps

IMP, Inc.

San Jose, CA

408-432-9100/www.impweb.com

next

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