68HC11

V_CC.......................................................................-0.3V to +6.0V
All Other Pins..............................................-0.3V to (V_CC + 0.3V)
Input Current (V_CC) ...........................................................20mA
Output Current (RESET)......................................................20mA
Rate of Rise (V_CC) ..........................................................100V/µs
Continuous Power Dissipation (T_A = +70°C)
SOT143 (derate 4mW/°C above +70°C) .......................320mW
Operating Temperature Range .........................-40°C to +85°C
Storage Temperature Range ..........................-65°C to +160°C
Lead Temperature (soldering, 10sec) ............................+300°C

      The MAX6314 low-power CMOS microprocessor (µP) supervisory circuit is designed to monitor power supplies in µP and digital systems. The MAX6314's RESET output is bidirectional, allowing it to be directly connected to µPs with bidirectional reset inputs, such as the 68HC11. It provides excellent circuit reliability and low cost by eliminating external components and adjustments. The MAX6314 also provides a debounced manual reset input.

      The 68HC11 performs a single function: it asserts a reset signal whenever the VCC supply voltage falls below a preset threshold or whenever manual reset is  asserted. Reset remains asserted for an internally programmed interval (reset timeout period) after VCC has risen above the reset threshold or manual reset is deasserted.

      The 68HC11 comes with factory-trimmed reset threshold voltages in 100mV increments from 2.5V to 5V. Preset timeout periods of 1ms, 20ms, 140ms, and 1120ms (minimum) are also available. The device comes in a SOT143 package.

      For a µP supervisor with an open-drain reset pin, see the 68HC11 data sheet.