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3 Pin Microcontroller Power Supply Supervisor

ASM809, ASM810

October 2003

rev 1.0

Pin Diagram

Block Diagram

Pin Description

Pin #

Name

Function

ASM809

ASM810

GND

Ground.

RESET

RESET is asserted LOW if VCC falls below VTH and remains LOW for TRST after VCC exceeds the

threshold.

RESET

RESET is asserted HIGH if VCC falls below VTH and remains HIGH for TRST after VCC exceeds the

threshold.

VCC

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

Detailed Description

proper

reset input

enables

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

for the ASM810- when the VCC supply voltage falls below the

threshold trip voltage and remains asserted for 140ms

minimum after the VCC has risen above the threshold.

SOT23

ASM809

(ASM810)

GND

RESET

VCC

(RESET)

ASM809

ASM810

RESET

VCC

VTH

TRST

Figure 1: Reset TIming Diagram

RESET Generator

VCC

RESET

(RESET)

GND

ASM809

(ASM810)

4.38V

4.00V

3.08V

2.93V

2.63V

4.63V

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