MCP809 Datasheet, PDF (1/13 Pages) National Semiconductor (TI) – 3-Pin Microprocessor Reset Circuits

MCP809, MCP810
www.ti.com
SNVS165A – JUNE 2001 – REVISED MAY 2013
MCP809/MCP810 3-Pin Microprocessor Reset Circuits
Check for Samples: MCP809, MCP810
FEATURES
1
•2 Precise Monitoring of 3V, 3.3V, and 5V Supply
Voltages
• Fully specified over temperature
• 140ms min. Power-On Reset Pulse Width,
240ms Typical
– Active-low RESET Output (MCP809)
– Active-high RESET Output (MCP810)
• Specified RESET Output Valid for V_CC≥1V
• Low Supply Current, 15µA typical
• Power supply transient immunity
APPLICATIONS
• Microprocessor Systems
• Computers
• Controllers
• Intelligent Instruments
• Portable/Battery-Powered Equipment
• Automotive
DESCRIPTION
The MCP809/810 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-low RESET 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 15µA, the
MCP809/810 are ideal for use in portable equipment.
The MCP809/MCP810 are available in the 3-pin
SOT23 package.
Typical Application Circuit
Connection Diagram
Figure 1. Typical Application Circuit
Figure 2. ( ) are for MCP810
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2001–2013, Texas Instruments Incorporated