MIC706P/R/S/T, MIC708R/S/T

µP Supervisory Circuit

General Description

The MIC706 and MIC708 are inexpensive microprocessor

supervisory circuits that monitor power supplies in 3.0V

and 3.3V microprocessor-based systems. The circuit

functions include a watchdog timer, microprocessor reset,

power-failure warning, and a debounced manual reset

input.

The MIC706 offers a watchdog timer function, while the

MIC708 has an active-high reset output in addition to the

active-low reset output.

The R, S, and T versions are similar in all respects except

for supply voltage reset threshold levels. The threshold

levels are 2.63, 2.93, and 3.08V, respectively. When the

supply voltage drops below the reset threshold level,

/RESET (and RESET for the MIC708) is asserted.

The MIC706P is identical to the MIC706R, except that the

Reset output is asserted high.

Datasheets and support documentation are available on

Micrel’s web site at: www.micrel.com.

Features

• Maximum supply current: 30µA

• Debounced manual reset input is TTL/CMOS

compatible

• Reset pulse width: 200ms

• Watchdog timer: 1.6s (MIC706)

• Precision supply voltage monitor

• Easy power-fail warning or low-battery detect

Applications

• Laptop and desktop computers

• Intelligent systems

• Critical microprocessor power monitoring

• Printers

• Controllers

Typical Application

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

May 28, 2014

Revision 2.0