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RT9801AGE

P1-P3P4-P6P7-P9
RT9801A/B
1
DS9801A/B-13 April 2011 www.richtek.com
Pin Configurations
User Programmable Micro-Power Voltage Detectors
Ordering Information
(TOP VIEW)
SOT-23-6
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 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.
Features
zz
zz
z
User Programmable Threshold 1.5V to 5V in 0.1V
Step with
±±
±±
±3% Accuracy
zz
zz
z Low Supply Current 3
μμ
μμ
μA
zz
zz
z Quick Reset within 20
μμ
μμ
μs
zz
zz
z Built-in Recovery Delay 200ms
zz
zz
z Low Functional Supply Voltage 0.9V
zz
zz
z Small SOT-23-6 Package
zz
zz
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.
Note :
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.
Typical Application Circuit
VSET0
GND
RESET
VSET1
VSET2
VDD
RT9801
GND
RESET
VDD
μP
Pull Up
RT9801 V
TH
= 2.5V in this example
VSET0
GND
VSET1
VSET2
VDD
4
23
56
RESET
RT9801
Package Type
E : SOT-23-6
Lead Plating System
P : Pb Free
G : Green (Halogen Free and Pb Free)
Reset Threshold
A : 2.5V to 5V
B : 1.5V to 4V
RT9801A/B
2
DS9801A/B-13 April 2011www.richtek.com
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
Function Block Diagram
Test Circuits
Detection Voltage
Output Transistor Current
Current Consumption
Dynamic Response
Note : Threshold Voltage Setting refer to the Table.1
6V
RT9801A/B
GND
RESET
CRT
100K
VDD
CL
P.G
V
DD
RT9801A/B
GND
V
RESET
VDD
A
VSET
CMP
Timer
POR
Threshold Voltage Setting
Power On Reset
VDD
VSET1
RESET
N MOS
VSET0
VSET2
Internal
Clock
GND
RT9801A/B
V
DD
GND
V
RESET
R
100K
Oscilloscopes
VDD
V
RESET
V
DD
RT9801A/B
GND
RESET
VDD
A
V
V
RT9801A/B
3
DS9801A/B-13 April 2011 www.richtek.com
Absolute Maximum Ratings
z Terminal Voltage (with Respect to GND)
V
DD
------------------------------------------------------------------------------------------------------------------------ –0.3V to 6.0V
All Other Inputs -------------------------------------------------------------------------------------------------------- –0.3V to V
DD
+0.3V
z Input Current, V
DD
----------------------------------------------------------------------------------------------------- 20mA
z Continuous Power Dissipation, P
D
@ T
A
= 25°C
SOT-23-6 ---------------------------------------------------------------------------------------------------------------- 0.25W
z Operating Junction Temperature Range -------------------------------------------------------------------------- –40°C to 125°C
z Storage Temperature Range ---------------------------------------------------------------------------------------- –65°C to 125°C
z Package Thermal Resistance
SOT-23-6, θ
JA
----------------------------------------------------------------------------------------------------------- 250°C /W
z Lead Temperature (Soldering, 10sec.)---------------------------------------------------------------------------- 260°C
Electrical Characteristics
(V
DD
= 3V, unless otherwise specified)
Parameter Symbol Test Conditions Min Typ Max Unit
Operating VDD Range
V
DD
0.9 -- 6 V
-- -- 3
Supply Current
I
DD
V
DD
= 1.5V ~ 3.5V, I
SINK
= 0
V
DD
= 3.5V ~ 5V, I
SINK
= 0
-- -- 3.3
μA
Reset Threshold
V
TH
T
A
= 27°C
-- Note1 -- V
Threshold Voltage Accuracy
ΔV
TH
T
A
= 27°C
-- -- 3 %
V
DD
Drop to Reset Delay t
RD
Drop = -125mV -- -- 20 μs
Reset Active Timeout Period
t
RP
V
DD
≥ 1.02×V
TH
, Programmable
120 200 280 ms
V
IL
T
A
= 27°C
--
0.15V
DD
--
VSET Pin Input Threshold
V
IH
T
A
= 27°C
--
0.85V
DD
--
V
RESET Output Voltage
V
OL
V
DD
< V
TH
, I
SINK
= 3.5mA
-- 0.4 -- V
Timing Diagram
V
DD
V
TH
V
RESET
t
RP
t
RD
Drop
V
DD
V
TH
V
RESET
P1-P3P4-P6P7-P9

RT9801AGE

Mfr. #:
Buy RT9801AGE
Manufacturer:
Description:
IC VOLT DETECTOR PROG SOT23-6
Lifecycle:
New from this manufacturer.
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