MIC812

Features:

` RESET Remains Valid with VCC as Low as 1.4V
` Precision Voltage Monitor for 3V, 3.3V or 5V Power Supplies
` Available in 4-Pin SOT-143 Package
` <15A Supply Current
` 140ms Minimum Reset Pulse Width
` Manual Reset Input


Application

· Portable Equipment
· Intelligent Instruments
· Critical Microprocessor Power Monitoring
· Printers/Computers
· Controllers


Pinout

Specifications

Terminal Voltage
    VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  . . -0.3V to 6.0V
    MR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  . . -0.3V to (V_CC + 0.3V)
Input Current, VCC, MR . . . . . . . . . . . . . . . . . . . . . .  . 20mA
Output Current, RESET, RESET . . . . . . . . . . . . . . . . . .20mA
Rate of Rise, V_CC . . . . . . . . . . . . . . . . . . . . . . . .. . . . . 100V/s
Operating Temperature Range
    MIC81--U . . . . . . . . . . . . . . . . . . . . .  . . . . . . . . . . . -40°C to 85°C
Storage Temperature Range  . . . . . . . . . . . . . . . . . . .-65°C to 150°C
Lead Temperature (Soldering - 10 sec.) . . . . . . . . . . . 300°C
Power Dissipation (T_A = +70°C)  . . . . . . . . . . . . . . . . 320mW


Description

The MIC811/MIC812 are inexpensive microprocessor supervisory circuits that monitor power supplies in microprocessor based systems.

The function of MIC812 is to assert a reset if either the power supply drops below a designated reset threshold level or MR is forced low. Several different reset threshold levels are available to accomodate 3V, 3.3V or 5V powered systems.

The MIC811 has an active low RESET output, while the MIC812 offers an active high RESET output. The reset output is guaranteed to remain asserted for a minimum of 140ms after V_CC has risen above the designated reset threshold level. The MIC811/MIC812 come in a 4- pin SOT-143 package.