LTC691CSW#PBF

LTC691 is a microprocessor supervisory circuit. It provides complete power supply monitoring and battery control functions for microprocessor reset, battery backup, CMOS RAM write protection, power failure warning and watchdog timing. A precise internal voltage reference and comparator circuit monitor the power supply line. When an out-of-tolerance condition occurs, the reset outputs are forced to active states and the chip enable output unconditionally write-protects external memory. This device powers the active CMOS RAMs with a charge pumped NMOS power switch to achieve low dropout and low supply current. When primary power is lost, auxiliary power, connected to the battery input pin, powers the RAMs in standby through an efficient PMOS switch. It is widely used in application such as critical µP power monitoring, intelligent Instruments, battery-powered computers and controllers, automotive systems etc.

• Guaranteed reset assertion at VCC = 1V
• Supply current is 0.6mA typical
• Propagation delay is 20ns typical
• Reset voltage threshold is 4.65V typical
• Reset active time is 50ms typical
• 1µA maximum standby current, performance specified over temperature
• Voltage monitor for power-fail or low battery warning
• Thermal limiting, superior upgrade for MAX690 family
• Operating temperature is 0°C to 70°C
• Packaging style is 16-lead wide plastic SO

Notes

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party