Circuito de supervisión del microprocesador LTC695ISW-3.3
peculiarity
- Ensure that the reset is determined at VCC
= 1V
- 1.5mA maximum supply current
- The RAM chip enables fast (35ns max) on-board strobe of the signal
- SO-8 and S16 packages
- 4.65V precision voltage monitor
- Power Supply Good/Reset Delay: 50ms, 200ms, or adjustable
- Minimum number of external components
- 1μA maximum standby current
- Voltage monitor for power failure or low battery alarm
- Thermal limiting
- Performance is specified over the entire temperature range
- An excellent upgrade to the MAX690 family
LTC®
The 690 Series provides complete power monitoring and battery control for microprocessor reset, battery backup, CMOS RAM write protection, power failure alarm, and watchdog timing. A precision internal voltage reference and comparator circuit monitors the power lines. When an out-of-tolerance condition occurs, the reset output is forced to an operating state, and the chip-enable output is unconditionally write-protected to external memory. furthermoreRESETThe output is guaranteed to be logic low, even if VCC
As low as 1V is no exception.
The LTC690 family utilizes a charge-pump NMOS power switch to power active CMOS RAM and is designed for low dropout and low supply current. When main power is lost, the standby RAM is powered by an auxiliary power supply (connected to the battery input pin) through a high-efficiency PMOS switch.
To provide early warning of impending power failure, the LTC690 family provides an internal comparator with user-defined thresholds. An internal watchdog timer is also provided that forces a reset pin to enter the operating state when the watchdog input is not transformed before a preset timeout period.