TC1271

Obsolete Device Recommended Replacements: TC1270A, TC1270AN, TC1271A TC1270/TC1271 4-Pin Reset Monitors Features: Precision VCC Monitor for 1.8V, 2.7V, 3.0V, 3.3V and 5.0V Nominal Supplies Manual Reset Input 140 ms Minimum RESET, Reset Output Duration RESET Output Valid to VCC = 1.0V (TC1270) Low 7 µA 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 Typical Operating Circuit VCC VCC Push Button MR RESET TC1270 GND VCC Processor Reset Input (Active Low) GND 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 20 µs (4 µs for F version) of VCC falling through the reset voltage threshold. Reset is maintained active for a minimum of 140 ms 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 opti...