HIGH-ACCURACY UP RESET CIRCUIT

The MAX6394 low-power CMOS microprocessor (µP) supervisory circuit is designed to monitor power supplies in µP and digital systems. It offers excellent circuit reliability by providing 1% accurate thresholds over temperature and by eliminating external components and adjustments. The MAX6394 also provides a debounced manual reset input. This device 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. Active-low 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 MAX6394"s open-drain active-low RESET output can be pulled up to a voltage higher than VCC. The MAX6394 comes with factory-trimmed reset threshold voltages from 2.4V to 4.8V. Preset timeout periods of 0.7ms, 14ms, 105ms, and 826ms are also available. The device comes in a SOT143 package.

• ±0.6% Threshold Accuracy at T_A = +25°C
• ±1.0% Threshold Accuracy from -40°C to +125°C
• Small SOT143 Package
• Open-Drain Active-Low RESET Output Can Exceed V_CC
• Precision, Factory-Set V_CC Reset Thresholds: Nine Options from 2.4V to 4.8V
• Four Reset Timeout Periods Available: 0.7ms, 14ms, 105ms, and 826ms (minimum)
• Immune to Short V_CC Transients
• 5µA Supply Current