© 1999 Microchip Technology Inc.

Preliminary

DS11187D-page 1

MCP100/101

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 (MCP100) or active high

RESET (MCP101)

• Push-pull output

• Holds RESET/RESET for 350 ms (typical)

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

for 3V systems over temperature

• 45 µA typical operating current

• Temperature range:

- Industrial (I): -40

°C to +85°C

DESCRIPTION

The Microchip Technology Inc. MCP100/101 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 push-pull outputs. The MCP100 has a

low active RESET pin and the MCP101 has a high

active RESET pin. The MCP100/101 will assert the

RESET/RESET signal whenever the voltage on the

PACKAGES

BLOCK DIAGRAM

RST

MCP100

MCP101

MCP100

MCP101

MCP100

MCP101

TO-92 with

‘D’ Bondout

TO-92 with

‘H’ Bondout

SOT-23-3

RST

OR

RST

RST

OR

RST

RST

OR

Bandgap

Reference

Delay

Circuit

Output

Driver

RESET

+

-

Comparator

RESET

or

Microcontroller Supervisory Circuit with Push-Pull Output

11187d.book Page 1 Friday, September 10, 1999 8:52 AM