ADM9264

a FEATURES Monitoring of 12 V, 5 V, 3.3 V and 2.8 V Supplies in Parallel Auxiliary Sensor Inputs Low Power: 25 ␮A Typical Internal Comparator Hysteresis Power Supply Glitch Immunity VCC from 2.5 V to 6 V Guaranteed from –40 ؇ C to +85؇ C No External Components 16-Pin Narrow SOIC Package (150 Mil Wide) APPLICATIONS Microprocessor Systems Computers Controllers Intelligent Instruments Network Systems Quad Power Supply Monitor for Desktop PCs ADM9264 FUNCTIONAL BLOCK DIAGRAM L GND 1 H SU1 2 15 ERR2 16 ERR1 L PWROK MONITOR LOGIC SU2 3 H 14 PWROK L SU3 4 13 ERR3 H SU4 5 L NC 6 H 11 DIS 12 ERR4 GENERAL DESCRIPTION ERRX 7 VREF 10 ERRY The ADM9264 is a Quad Supply Monitor IC which simultaneously monitors four separate power supply voltages and outputs error signals if any of the supply voltages go out of limits. It is designed for PC supply monitoring but can be used on any system where multiple power supplies require monitoring. The error output signals are available individually and also gated into a common output - PWROK. Auxiliary inputs ERRX, ERRY are provided which are also gated into the main PWROK signal. These inputs allow signals from other monitoring circuits (for example temperature sensor, alarm, etc.) to be linked into the ADM9264. Each power supply monitor circuit uses a proprietary window comparator design whereby a three resistor network is used in conjunction with two comparators and a single precision voltage reference to check if the supply is within i...