ST2805 1.0V~6.5V ±1% Voltage Detector with Built-in 200ms Delay, CMOS Output
Specifications
Product details
Overview
The ST2805 is a high-precision voltage detector in an ultra-small package, developed with CMOS process and featuring a built-in fixed delay time generator; its internal oscillator and counter timer delay the release signal without external parts. The detect voltage ranges from 1.0V~6.5V in 0.1V steps with ±1% accuracy and minimal temperature drift (±100ppm/℃ typical), while quiescent current is only 0.9µA typical at VDD=3V. The delay time is fixed by the built-in oscillation circuit and counter: 200ms (130~290ms) when the DS pin is tied low, shortened to 220µs when DS is tied high and the output is taken from the middle of the counter; no delay is applied when the voltage falls below the detect threshold, ensuring fast reset response. With a CMOS push-pull output, SOT23-3 package and -40~+85℃ operating range, the ST2805 delivers a precise delayed-reset power monitoring solution for portable devices and microcomputer systems.
Features
- High accuracy: ±1%
- Built-in fixed delay time generator, no external parts required
- Release delay: 200ms (130~290ms) with DS low, 220µs with DS high
- Low power consumption: 0.9µA typical (VDD=3V)
- Detect voltage range: 1.0V~6.5V in 0.1V increments
- Operating voltage range: 0.7V~7V
- Detect voltage temperature characteristics: ±100ppm/℃ typical
- Built-in hysteresis: 0.06V typical
- CMOS push-pull output, 50mA rated output current
- Ultra-small SOT23-3 package
Typical Applications
- Power monitor for portable equipment such as notebook computers, digital still cameras, PDAs and cellular phones
- Constant voltage power monitor for cameras, video equipment and communication devices
- Power monitor for microcomputers and reset for CPUs
- System battery life and charge voltage monitors
