TC1273

• Precision V_CC Monitor for 5.0V Systems
• 100 msec Minimum RESET, RESET Output Duration
• Output Valid to V_CC = 1.2V
• V_CC Transient Immunity
• Small 3-Pin SOT-23B Package
• No External Components

Absolute Maximum Ratings†
Supply Voltage (V_CC to GND) ...........................+6.0V
RESET, RESET.......................... -0.3V to (V_CC + 0.3V)
Input Current, V_CC...........................................20 mA
Output Current, RESET, RESET.........................20 mA
Power Dissipation (T_A 70°C)
      3-Pin SOT-23B (derate 4 mW/°C above +70°C)
        .............................................................230 mW
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 TC1272/TC1273/TC1274 are cost-effectivesystem supervisor circuits designed to monitor V_CC 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 sec of V_CC falling through the reset voltage threshold. RESET ismaintained active for a minimum of 100 msec after V_CC rises above the reset threshold. The TC1274 has an active-high RESET output, while they 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 them is valid down to V_CC = 1.2V. The TC1274 is valid down to V_CC = 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 V_CC line.