RT9801 Datasheet PDF - RichTek

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RT9801
RichTek

Part Number RT9801
Description User Programmable Micro-Power Voltage Detectors
Page 6 Pages


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Preliminary
RT9801
User Programmable Micro-Power Voltage Detectors
General Description
The RT9801 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 ~ 4V and 2.5V ~ 5V, which are
programmed in factory are offered by customer
demands.
The RT9801 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.
RT9801 is N-channel, open-drain output and
provided in SOT-26 package.
Ordering Information
RT9801… … …
Package Type
E : SOT-26
Operating temperature range
C: Commercial standard
Reset Threshold
A : 2.5V~5V
B : 1.5V~4V
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-26 Package
Applications
z Computers
z Controllers
z Intelligent Instruments
z Critical µP and µC Power Monitoring
z Portable/Battery-Powered Equipment
Pin Configurations
Part Number
Pin Configurations
RT9801…CE
(Plastic SOT-26)
654
123
TOP VIEW
1. VSET0
2. GND
3. RESET
4. VDD
5. VSET2
6. VSET1
Typical Application Circuit
µP
GND
VDD
RESET
VSET0 VSET1
RT9801
GND VSET2
RESET VDD
Pull Up
RT9801B VTH = 2.5V in this example
DS9801-00 January 2002
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RT9801
Preliminary
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
VDD
VSET0
VSET1
VSET2
VSET
CMP
Threshold Voltage Setting
TIMER
POR
Power On Reset
RESET
N
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Preliminary
Absolute Maximum Ratings
z Terminal Voltage (with Respect to GND)
VDD
All Other Inputs
z Input Current, VDD
z Continuous Power Dissipation, PD @ TA = 25°C
SOT-26
z Operating Junction Temperature Range
z Storage Temperature Range
z Package Thermal Resistance
SOT-26, θJA
z Lead Temperature (Soldering, 5sec.)
Electrical Characteristics
(VDD = 3.0, unless specified)
Parameter
Symbol
Test Conditions
Operating VDD (VOUT) Range VDD
Supply Current
IDD
Reset Threshold
Threshold Voltage Accuracy
VCC Drop to Reset Delay
VTH
VTH
tRD
VDD = 1.5V ~ 3.5V, IOUT = 0
VDD = 3.5V ~ 5V, IOUT = 0
TA = 27°C
TA = 27°C
Drop = -125mV
Reset Active Time Out Period tRP
VDD 1.02×VTH,
Programmable
VSET Pin Input Threshold
VIL TA = 27°C
VIH TA = 27°C
RESET Output Voltage
VOL VDD < VTH, ISINK = 3.5mA
RT9801
-0.3V to 6.0V
-0.3V to VDD+0.3V
20mA
0.25W
-40°C ~ 125°C
-65°C ~ 125°C
250°C /W
260°C
Min Typ Max Units
0.9 --
6V
-- 3
3.3 µA
-- Note1 --
V
-- 3 %
-- -- 20 µS
-- 200 -- mS
-- 0.15VDD --
-- 0.85VDD --
V
-- 0.4 -- V
DS9801-00 January 2002
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RT9801
Preliminary
Note 1: Pin Conditions for Programmable Threshold Voltage Setting
RT9801A
RT9801B
Vset0 input
Vset1 input
Vset2 input
5
4
VDD
VDD
VDD
4.9
3.9
VDD
VDD floating
4.8
3.8
VDD
VDD GND
4.7
3.7
VDD
floating
VDD
4.6
3.6
VDD
floating
floating
4.5
3.5
VDD
floating
GND
4.4
3.4
VDD
GND
VDD
4.3
3.3
VDD
GND
floating
4.2
3.2
VDD
GND
GND
4.1
3.1
floating
VDD
VDD
4 3 floating VDD floating
3.9
2.9
floating
VDD
GND
3.8
2.8
floating
floating
VDD
3.7
2.7
floating
floating
floating
3.6
2.6
floating
floating
GND
3.5
2.5
floating
GND
VDD
3.4
2.4
floating
GND
floating
3.3
2.3
floating
GND
GND
3.2
2.2
GND
VDD
VDD
3.1
2.1
GND
VDD floating
3 2 GND VDD GND
2.9
1.9
GND
floating
VDD
2.8
1.8
GND
floating
floating
2.7
1.7
GND
floating
GND
2.6
1.6
GND
GND
VDD
2.5
1.5
GND
GND
floating
VDD: bond to VDD; 0: bond to GND; f: no bonding
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DS9801-00 January 2002



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