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MCP120

Microcontroller Supervisory Circuit with Open Drain Output

Microchip Technology 

MCP120/130

Microcontroller Supervisory Circuit with Open Drain Output

FEATURES

• Holds microcontroller in reset until supply voltage

reaches stable operating level

• Resets microcontroller during power loss

• Precision monitoring of 3V, 3.3V and 5V systems

• 7 voltage trip points available

• Active low RESET pin

• Open drain output

• Internal pull-up resistor (5 kΩ) for MCP130

• Holds RESET for 350 ms (typical)

• RESET to VCC = 1.0V

• Accuracy of ±125 mV for 5V systems and ±75 mV

for 3V systems over temperature

• 45 µA typical operating current

• Temperature range:

- Industrial (I): -40°C to +85°C

DESCRIPTION

The Microchip Technology Inc. MCP120/130 is a volt-

age supervisory device designed to keep a microcon-

troller in reset until the system voltage has reached the

proper level and stabilized. It also operates as protec-

tion from brown-out conditions when the supply voltage

drops below a safe operating level. Both devices are

available with a choice of seven different trip voltages

and both have open drain outputs. The MCP130 has an

internal 5 kΩ pullup resistor. Both devices have active

low RESET pins. The MCP120/130 will assert the

RESET signal whenever the voltage on the VDD pin is

below the trip-point voltage.

PACKAGES

TO-92 with

‘D’ Bondout

TO-92 WITH

‘F’ BONDOUT

RST VSS

VDD

MCP120

MCP130

VSS

VDD

RST

MCP130

TO-92 with

‘G’ Bondout

TO-92 with

‘H’ Bondout

VDD

RST

VSS

MCP120

VDD

VSS

RST

MCP120

MCP130

SOT-23-3

150mil SOIC

RST

VDD

RST 1

VSS

VDD 2

NC 3

VSS 4

8 NC

7 NC

6 NC

5 NC

MCP120

MCP130

MCP120

MCP130

BLOCK DIAGRAM

VDD

Comparator

+

-

Delay

Circuit

Output

Driver

5kΩ internal

pull-up on

MCP130

only

RESET

Bandgap

Reference

 2001 Microchip Technology Inc.

DS11184D-page 1

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