User Programmable Micro-Power Voltage Detectors

RT9801A/RT9801B

The RT9801A/B is a micro-power voltage detector supervising the power supply voltage level for microprocessors (μP) or digital systems. It provides user programmable threshold levels with 0.1V step ranging from 1.5V to 5V, which covers most digital applications. It features low supply current of 3μA. Selection of V_TH is easily achieved through 3 pins connected to GND, V_DD or floating for different threshold voltage settings. Two versions of threshold voltages, 1.5V to 4V and 2.5V to 5V, which are programmed in factory are offered by customer demands.

The RT9801A/B performs supervisory function by sending out a reset signal whenever the V_DD voltage falls below a preset threshold level. This reset signal will last the whole period before V_DD recovering. Reset signal will release after V_DD is recovered and last for the whole period of Reset Active Time-out period.

RT9801A/B is N-Channel, open-drain output and provided in SOT-23-6 package.

Applications

Computers
Controllers
Intelligent Instruments
Critical μP and μC Power Monitoring
Portable/Battery-Powered Equipment

Key Spec.

	RT9801A	RT9801B
Status	Active	Active
Vin (min) (V)	0.9	0.9
Vin (max) (V)	6	6
VTH (min) (V)	2.5	1.5
VTH (max) (V)	5	4
Accuracy (±%)	3	3
Reset Time-out Period (typ) (ms)	200	200
Reset Delay Time (typ) (ms)	0.02	0.02
Package Type	SOT-26	SOT-26

Features

User Programmable Threshold 1.5V to 5V in 0.1V Step with ±3% Accuracy
Low Supply Current 3μA
Quick Reset within 20μs
Built-in Recovery Delay 200ms
Low Functional Supply Voltage 0.9V
Small SOT-23-6 Package
RoHS Compliant and 100% Lead (Pb)-Free

Datasheet

DS9801AB-13.pdf

Datasheet

DS9801AB-13.pdf

RT9801AGE

Package Type:SOT-26

Sample Buy

RT9801BGE

Package Type:SOT-26

Sample Buy