DESCRIPTION

The DS1836 MicroManager performs three vital system functions. First, a precision temperature compensated reference and comparator circuit monitor the status of the voltage on VCC and when an out of-tolerance condition is detected, an internal power-fail signal is generated that forces the reset active. If VCC continues to degrade, it switches to the battery supply when VCC drops below 3.8V (2.6V for 3.3V versions). When VCC exceeds 3.9V (2.8V for 3.3V versions); VOUT will again be supplied from VCC. Reset will remain active for 350 ms after VCC returns to an in-tolerance condition.

FEATURES

ƒ 5V or 3.3V power-on reset

ƒ True 3V operation power switch

ƒ Switches to battery at 3.8V (2.6V for 3.3V versions)

ƒ Excellent for systems designed to operate with dual power supplies

ƒ Asserts resets during power transients

ƒ Maintains reset for 350ms after VCC returns to an in-tolerance condition

ƒ Reduces need for discrete components

ƒ Precision temperature-compensated voltage reference and voltage sensor

ƒ 8-pin DIP or space saving 8-pin SO surface mount available

ƒ CMOS reset output for low current operation

ƒ Operating temperature of -40°C to +85°C

ƒ Perfect for PIC microprocessor applications