General Description
The TC1270 and TC1271 are cost-effective system supervisor circuits designed to monitor VCC in digital systems and provide a reset signal to the host processor when necessary. A manual reset input is provided to override the reset monitor, and is suitable for use as a push-button reset. No external components are required.
The reset output is driven active within 20µsec (4µsec for F version) of VCC falling through the reset voltage threshold. RESET is maintained active for a minimum of 140msec after VCC rises above the reset threshold. The TC1271 has an active-high RESET output while the TC1270 has an active-low RESET output. The output of the TC1270 is valid down to VCC = 1V. Both devices are available in a 4-Pin SOT-143 package.
The TC1270/TC1271 devices are optimized to reject fast transient glitches on the VCC line. Low supply current of 7µA (VCC = 3.3V) makes these devices suitable for battery powered applications.

FEATUREs
• Precision VCC Monitor for 1.8V, 2.7V, 3.0V, 3.3V and 5.0V Nominal Supplies
• Manual Reset Input
• 140msec Minimum RESET, RESET Output Duration
• RESET Output Valid to VCC = 1.0V (TC1270)
• Low 7µA Supply Current
• VCC Transient Immunity
• Small 4-Pin SOT-143 Package
• No External Components
• Replacement for MAX811/812 and Offers a Lower Threshold Voltage Option

APPLICATIONs
• Computers
• Embedded Systems
• Battery Powered Equipment
• Critical µP Power Supply Monitoring