TC1271

• Precision V_CC Monitor for 1.8V, 2.7V, 3.0V, 3.3V and 5.0V Nominal Supplies
• Manual Reset Input
• 140msec MinimumRESET, RESET Output Duration
• RESET Output Valid to V_CC = 1.0V (TC1270)
• Low7A Supply Current
• V_CC Transient Immunity
• Small 4-Pin SOT-143 Package
• No External Components
• Replacement for MAX811/812 and Offers a Lower Threshold Voltage Option

Absolute Maximum Ratings*

Supply Voltage (V_CC to GND) .........................+6.0V
RESET, RESET......................... -0.3V to (V_CC + 0.3V)
Input Current, V_CC...........................................20mA
Output Current, RESET, RESET.........................20mA
Operating Temperature Range......-40°C to +85°C
Storage Temperature Range ..... -65°C to +150°C

*Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions above those indicated in the operation sections of the specifications is not implied. Exposure to Absolute Maximum Rating conditions for extended periods may affect device reliability.

The TC1270 and TC1271 are cost-effective system supervisor circuits designed to monitor V_CC 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 TC1271 reset output is driven active within 20sec (4sec for F version) of V_CC falling through the reset voltage threshold. RESET is maintained active for a minimum of 140msec after V_CC 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 V_CC = 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 V_CC line. Low supply current of 7A (V_CC = 3.3V) makes these devices suitable for battery powered applications.