MCP810

Features:

Precise monitoring of 3V, 3.3V, and 5V supply voltages
Fully specified over temperature
140ms min. Power-On Reset pulse width, 240ms typical Active-lowRESET Output (MCP809) Active-high RESET Output (MCP810)
Guaranteed RESET Output valid for V_CC1V
Low Supply Current, 15A typ.
Power supply transient immunity




Application

Microprocessor Systems
Computers
Controllers
Intelligent Instruments
Portable/Battery-Powered Equipment
Automotive




Pinout






Specifications

Parameter Name	Value
Manual Reset	No
Watchdog Timer	No
Typical Reset Pulse Width (ms)	350
Reset Type	Active High
Typical Supply Current (uA)	45
Vcc Range Min (V)	1.0
Vcc Range Max (V)	5.5
Output	Push-Pull
Temp Range Min. (°C)	-40
Temp Range Max. (°C)	+85
Nominal Reset Voltage (V)	4.60, 4.50, 4.35, 4.25, 3.00, 2.85, 2.55

If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications.
V_CC −0.3V to 6.0V
RESET,RESET−0.3V to (V_CC+ 0.3V)
Input Current, V_CC Pin 20mA
Output Current, RESET, RESET
Pin20mA
Rate of Rise, V_CC100V/s
ESD Rating (Note 2) 2kV
Continuous Power Dissipation (TA = +70°C)
SOT-23 (Note 3) 320mW
Ambient Temperature Range −40°C to +105°C
Maximum Junction Temperature 125°C
Storage Temperature Range −65°C to +160°C
Lead Temperature (soldering, 10sec) +300°C




Description

The MCP810 is a voltage supervisory device designed to keep a microcontroller in reset until the system voltage has reached the proper level and stabilized. It also operates as protection from brown-out conditions when the supply voltage drops below a safe operating level. MCP809 has a CMOS push-pull output with active high reset and is available in a choice of seven different trip voltages. It operates over the extended industrial temperature range (-40°C/+85°C). MCP810 is available in a SOT23-3 package.

The MCP809/MCP810 microprocessor supervisory circuits can be used to monitor the power supplies in microprocessor and digital systems. They provide a reset to the microprocessor during power-up, power-down and brown-out conditions.

The function of the MCP809/810 is to monitor the V_CC supply voltage, and assert a reset signal whenever this voltage declines below the factory-programmed reset threshold. The reset signal remains asserted for 240ms after V_CC rises above the threshold. The MCP809 has an active-lowRESET output, while the MCP810 has an active-high RESET output.

Seven standard reset voltage options are available, suitable for monitoring 5V, 3.3V, and 3V supply voltages.

With a low supply current of only 15A, the MCP809/810 are ideal for use in portable equipment. The MCP809/MCP810 are available in the 3-pin SOT23 package.