TCM809 datasheet(1/14 Pages) MICROCHIP | 3-Pin Microcontroller Reset Monitors

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 2004 Microchip Technology Inc.

DS21661C-page 1

TCM809/TCM810

Features

• Precision VDD Monitor for 2.5V, 3.0V, 3.3V, 5.0V

Nominal System Voltage Supplies

• 140 msec Minimum RESET Time Out Period

• RESET Output to VDD = 1.0V (TCM809)

• Low Supply Current, 9 µA (typ.)

•VDD Transient Immunity

• Small 3-Pin SC-70 and SOT-23B Packages

• No External Components

• Push-Pull RESET Output

• Temperature Range:

- Industrial, SC-70 (E): -40

°C to +85°C

- Extended, SOT-23, SC-70 (V): -40

°C to +125°C

Applications

• Computers

• Embedded Systems

• Battery-Powered Equipment

• Critical Microcontroller Power Supply Monitoring

• Automotive

Typical Application Circuit

General Description

The TCM809 and TCM810 are cost-effective system

supervisor circuits designed to monitor VDD in digital

systems and provide a reset signal to the host proces-

sor, when necessary. No external components are

required.

The RESET output is typically driven active within

65 µsec of VDD falling through the reset voltage thresh-

old. RESET is maintained active for a minimum of

140 msec after VDD rises above the reset threshold.

The TCM810 has an active-high RESET output, while

the TCM809 has an active-low RESET output. The out-

put of the TCM809/TCM810 is valid down to VDD = 1V.

Both devices are available in 3-Pin SC-70 and SOT-23B

packages.

The TCM809/TCM810 is optimized to reject fast

transient glitches on the VDD line. A low supply current

of 9 µA (typ., VDD = 3.3V) make these devices suitable

for battery-powered applications.

Pin Configurations

TCM809

RESET

INPUT

(Active-Low)

GND

PICmicro®

Microcontroller

SOT-23B/SC-70

Note: 3-Pin SOT-23B is equivalent to

TCM809 RESET

GND 1

TCM810 (RESET)

JEDEC TO-236.

3-Pin Microcontroller Reset Monitors

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