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Notice: The information in this document is subject to change without notice

3 Pin Microcontroller Power Supply Supervisor

ASM809, ASM810

October 2003

rev 1.0

Pin Diagram

Block Diagram

Pin Description

Pin #

Pin

Name

Function

ASM809

ASM810

1

-

GND

Ground.

2

-

RESET

threshold.

-

2

RESET

threshold.

3-

Power supply input voltage (3.0V, 3.3V, 5.0V).

Detailed Description

A

proper

reset input

enables

a

microprocessor /

microcontroller to start in a known state. ASM809/810 assert

reset to prevent code execution errors during power-up,

power-down and brown-out conditions.

Reset Timing

The reset signal is asserted- LOW for the ASM809 and HIGH

threshold trip voltage and remains asserted for 140ms

1

2

3

SOT23

ASM809

(ASM810)

GND

RESET

(RESET)

ASM809

ASM810

RESET

RESET

0V

5V

0V

5V

0V

5V

Figure 1: Reset TIming Diagram

+

-

RESET Generator

-

+

RESET

(RESET)

GND

ASM809

(ASM810)

4.38V

4.00V

3.08V

2.93V

2.63V

4.63V