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  Richtek Technology Electronic Components Datasheet  

RT9802 Datasheet

User Programmable Micro-Power Voltage Detectors

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RT9802 pdf
Preliminary
RT9802
User Programmable Micro-Power Voltage Detectors
General Description
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The RT9802 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 RT9802 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 lasts for the whole period of Reset Active
Time-out period.
RT9802 is CMOS, active-low output and provided in
SOT-23-6 package.
Ordering Information
RT9802-
Package Type
E : SOT-23-6
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
Reset Threshold
A : 2.5V to 5V
B : 1.5V to 4V
Note :
RichTek Pb-free and Green 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.
`100%matte tin (Sn) plating.
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
Marking Information
For marking information, contact our sales representative
directly or through a RichTek distributor located in your
area, otherwise visit our website for detail.
Pin Configurations
(TOP VIEW)
VSET1 VSET2 VDD
65 4
123
VSET0 GND RESET
SOT-23-6
Note : There is no pin1 indicator on top mark for SOT-23-6
type, and pin 1 will be lower left pin when reading top mark
from left to right.
DS9802-07 March 2007
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT9802 Datasheet

User Programmable Micro-Power Voltage Detectors

No Preview Available !

RT9802 pdf
RT9802
Typical Application Circuit
Preliminary
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μP
VDD GND
RESET
VSET0 VSET1
RT9802
GND VSET2
RESET VDD
RT9802B VTH = 2.5V in this example
Functional Pin Description
Pin Name Pin Function
VSET0
Threshold Voltage Selection Pin 1
GND
Ground Pin
RESET
Reset Pulse Output, Negative Pulse
VDD
Power Pin
VSET1
Threshold Voltage Selection Pin 2
VSET2
Threshold Voltage Selection Pin 3
Function Block Diagram
Internal Clock
VSET0
VSET1
VSET2
VSET
CMP
Timer
Threshold Voltage Setting
POR
Power On Reset
VDD
P MOS
N MOS
RESET
GND
www.richtek.com
2
DS9802-07 March 2007


Part Number RT9802
Description User Programmable Micro-Power Voltage Detectors
Maker Richtek Technology Corporation
Total Page 5 Pages
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