DS1834

The DS1834 from Analog Devices is a dual voltage supervisor IC that monitors three vital system conditions: 5-volt supply, 3.3-volt supply, and an external override via a pushbutton input. It utilizes a precision temperature-compensated voltage reference and comparator circuit to detect out-of-tolerance conditions on the power supplies. When an out-of-tolerance condition is detected, the corresponding reset output is asserted.

This device is designed for systems operating with dual power supplies. It asserts resets during power transients and maintains reset for approximately 350 ms after the power supply returns to an in-tolerance condition. The internal power is drawn from the higher of the two input voltage supplies (5VIN or 3.3VIN). The DS1834 is available in an 8-pin DIP package and operates over a temperature range of -40°C to +85°C.

Key features include CMOS output for low current operation, reducing the need for discrete components in system designs. The pushbutton reset input allows for system override, ensuring robust control. The supervisor provides active low reset outputs and a reset timeout of 200ms minimum.