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  Richtek Technology Electronic Components Datasheet  

RT9801B Datasheet

User Programmable Micro-Power Voltage Detectors

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RT9801B pdf
RT9801A/B
User Programmable Micro-Power Voltage Detectors
General Description
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 VTH is
easily achieved through 3 pins connected to GND, VDD 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 VDD voltage falls below a
preset threshold level. This reset signal will last the whole
period before VDD recovering. Reset signal will release after
VDD 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.
Ordering Information
RT9801
Package Type
E : SOT-23-6
Lead Plating System
P : Pb Free
G : Green (Halogen Free and Pb Free)
Note :
Reset Threshold
A : 2.5V to 5V
B : 1.5V to 4V
Richtek products are :
` RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
` Suitable for use in SnPb or Pb-free soldering processes.
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
Features
z User Programmable Threshold 1.5V to 5V in 0.1V
Step with ±3% Accuracy
z Low Supply Current 3μA
z Quick Reset within 20μs
z Built-in Recovery Delay 200ms
z Low Functional Supply Voltage 0.9V
z Small SOT-23-6 Package
z RoHS Compliant and 100% Lead (Pb)-Free
Applications
z Computers
z Controllers
z Intelligent Instruments
z Critical μP and μC Power Monitoring
z Portable/Battery-Powered Equipment
Pin Configurations
(TOP VIEW)
654
23
SOT-23-6
Typical Application Circuit
μP
VDD GND
RESET
VSET0 VSET1
RT9801
GND VSET2
RESET VDD
Pull Up
RT9801 VTH = 2.5V in this example
DS9801A/B-13 April 2011
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT9801B Datasheet

User Programmable Micro-Power Voltage Detectors

No Preview Available !

RT9801B pdf
RT9801A/B
Test Circuits
VDD
R
100K
VDD
V
RT9801A/B
RESET Oscilloscopes
GND
Detection Voltage
A
VDD
VDD V RT9801A/B RESET
GND
Current Consumption
VDD
100K
P.G
RESET CRT
RT9801A/B
6V
GND
CL
Dynamic Response
VDD
VDD
V
RESET
RT9801A/B
A
V
GND
VRESET
Output Transistor Current
Functional Pin Description
Pin Name Pin Function
VSET0
Threshold Voltage Selection Pin
GND
Ground Pin
RESET
Reset Pulse Output, Negative Pulse
VDD
Power Pin
VSET1
Threshold Voltage Selection Pin
VSET2
Threshold Voltage Selection Pin
Note : Threshold Voltage Setting refer to the Table.1
Function Block Diagram
VDD
VSET0
VSET1
VSET2
Internal
Clock
VSET
CMP
Timer
Threshold Voltage Setting
POR
Power On Reset
N MOS
RESET
GND
www.richtek.com
2
DS9801A/B-13 April 2011


Part Number RT9801B
Description User Programmable Micro-Power Voltage Detectors
Maker RichTek
Total Page 9 Pages
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RT9801B pdf
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