TC1274

M Features TC1272/TC1273/TC1274 General Description The TC1272/TC1273/TC1274 are cost-effective system supervisor circuits designed to monitor VCC in digital systems and provide a reset signal to the host processor when necessary. No external components are required. The reset output is driven active within 20 µsec of VCC falling through the reset voltage threshold. RESET is maintained active for a minimum of 100 msec after VCC rises above the reset threshold. The TC1274 has an active-high RESET output, while the TC1272 and TC1273 have an active-low RESET output. The TC1272 and TC1274 each have a complimentary output, while the TC1273 has an open-drain output. The output of the TC1272 and TC1273 is valid down to VCC = 1.2V. The TC1274 is valid down to VCC = 1.8V. All three devices are available in a 3-Pin SOT-23B package. The TC1272/TC1273/TC1274 devices are optimized to reject fast transient glitches on the VCC line. 3-Pin Reset Monitors for 5V Systems Precision VCC Monitor for 5.0V Systems 100 msec Minimum RESET, RESET Output Duration Output Valid to VCC = 1.2V VCC Transient Immunity Small 3-Pin SOT-23B Package No External Components Applications Computers Embedded Systems Battery-Powered Equipment Critical µP Power Supply Monitoring Package Type 3-Pin SOT-23B* RESET **(RESET) 1 Typical Operating Circuit TC1272 TC1273 TC1274 VCC 3 GND 2 VCC RESET 1 VCC RESET Input VCC 2 TC1272 * 3-Pin SOT-23B is equivalent to JEDEC TO-236 **( ) is for TC1274 GND ...