EM6325

Copyright

© 2005, EM Microelectronic-Marin SA

1

www.emmicroelectronic.com

Reset Circuit with Manual Reset

Description

The EM6325 is an ultra-low current reset circuit available in a

large variety of configurations and very small packages for

maximum flexibility in all end-applications up to 125°C and

using power supplies between 1.5V and 5.5V.

This circuit monitors the supply voltage of any electronic

system, and generates the appropriate reset signal after a

fixed reset timeout period. The threshold defines the

minimum allowed voltage which guarantees the good

output remains active for an additional delay time. This

allows the system to stabilize before getting fully active.

This circuit features a Manual Reset: an input that asserts

Small SC70-4L, SC70-5L and SOT23-5L packages as well

as ultra-low supply current of 2.9μA make the EM6325 an

ideal choice for portable and battery-operated devices.

Typical Application

V

DD

RESET

GND

RESET

MR

EM6325

V

DD

RESET

GND

RESET

MPU, DSP

V

DD

GND

*

Block Diagram

RESET

V

DD

GND

+

-

Voltage

Reference

MR

Reset

Logic

Filter

RESET

Oscillator

Features

Manual reset function

200ms reset timeout period (1.6ms, 25ms, 1600ms on

request)

Operating temperature range: -40°C to +125°C

±1.5% reset threshold accuracy

2.93V, 2.63V, 2.2V, 1.8V, 1.66V, 1.57V, 1.38V, 1.31V

3 reset output options:

Guaranteed Reset valid down to 0.9V

Very small SOT23-5L, SC70-5L and SC70-4L

Applications

Computers

Servers and workstations

Modems

Wireless communication

Metering

Playstations

PDA , Webpad

Automotive systems

SOT23-5 / SC70-5

top view

1

3

2

4

RESET

push-pull / open-drain

GND

RESET

push-pull

V

DD

MR

5

SC70-4

1

2

4

3

V

DD

GND

RESET

(RESET)

MR

top view

Pin Description

Pin

SOT23-5L / SC70-5L

SC70-4L

Name

Function

1

2

RESET

Active-low RESET output. RESET remains low for the reset timeout period and

then goes high after all reset conditions are deasserted or after

MR goes from low

to high

2

1

GND

Ground

3

2

RESET

Active-high RESET output. RESET remains high for the reset timeout period and

then goes low after all reset conditions are deasserted or after MR goes from low to

high

4

3

MR

Manual Reset input with an internal pull-up 15k

CMOS output or shorted to ground with a switch

5

4

Supply Voltage (5.5V max.)