Preliminary
RT9809
DS9809-02 July 2002
www.richtek.com
1
Micro-Power Voltage Detectors
General Description
The RT9809 is a micro-power voltage detector
supervising the power supply voltage level for
microprocessors (
P) or digital systems. It provides
internally fixed threshold levels with 0.1V per step
ranging from 1.5V to 5V, which covers most digital
applications. It features low supply current of 3
A.
The RT9809 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.
RT9809 is CMOS, active-low output and is provided
in SOT-23 package.
Ordering Information
RT9809-
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.
Features
Internally Fixed Threshold 1.5V to 5V in 0.1V Step
2% Accuracy
Low Supply Current 3
A
No External Components Required
Quick Reset within 20
S
Built-in Recovery Delay 200mS
Low Functional Supply Voltage 0.9V
Small 3-Pin SOT-23 Package
Applications
Computers
Controllers
Intelligent Instruments
Critical
P and
C Power Monitoring
Portable/Battery-Powered Equipment
Pin Configurations
Part Number
Pin Configurations
RT9809-
CV
(SOT-23)
TOP VIEW
1. GND
2. RESET
3. VDD
Typical Application Circuit
Operating temperature range
C: Commercial standard
Package Type
V : SOT-23
Reset Threshold
15 : 1.5V
16 : 1.6V
:
49 : 4.9V
50 : 5.0V
VDD
P
RESET
RT9809
VDD
RESET
GND
1
3
2
RT9809
Preliminary
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DS9809-02 July 2002
2
Pin Description
Pin Name
Pin Function
GND
Ground Pin
RESET
Reset Pulse Output, Negative Pulse
VDD
Power Pin
Function Block Diagram
VSET
CMP
TIMER
VDD
POR
VDD
RESET
P
N
Threshold Voltage Setting
Power On Reset
Preliminary
RT9809
DS9809-02 July 2002
www.richtek.com
3
Absolute Maximum Ratings
Terminal Voltage (with Respect to GND)
VDD
-0.3V to 6.0V
All Other Inputs
-0.3V to VDD+0.3V
Input Current, VDD
20mA
Output Current, RESET
20mA
Power Dissipation, P
D
@ T
A
= 25
C
SOT-23
0.25W
Operating Junction Temperature Range
-40
C ~ 125
C
Storage Temperature Range
-65
C ~ 125
C
Package Thermal Resistance
SOT-23,
JA
250
C /W
Lead Temperature (Soldering, 5sec.)
260
C
Electrical Characteristics
(VDD
= 3.0V, unless specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Units
Operating VDD (V
OUT
) Range
V
DD
0.9
--
6
V
--
--
3
Supply Current
I
DD
V
DD
= 1.5V ~ 3.5V, I
OUT
= 0
V
DD
= 3.5V ~ 5V, I
OUT
= 0
--
--
3.3
A
Reset Threshold
V
TH
T
A
= 27
C
--
Note1
--
V
Threshold Voltage Accuracy
V
TH
T
A
= 27
C
--
--
2
%
V
CC
Drop to Reset Delay
t
RD
Drop = -125mV
--
--
20
S
Reset Active Time Out Period
t
RP
V
DD
1.02
V
TH
--
200
--
mS
V
OH
V
DD
> V
TH
, I
SOURCE
= 1mA
--
0.8V
DD
--
RESET Output Voltage
V
OL
2<V
DD
< V
TH
, I
SINK
= 3.5mA
--
0.4
--
V
Note1: 1.5V ~ 5V, step 0.1V
RT9809
Preliminary
www.richtek.com
DS9809-02 July 2002
4
Typical Operating Characteristics
Supply Current vs. Input Voltage
0
1
2
3
4
0
1
2
3
4
5
6
Input Voltage V
IN
(V)
-30 C
25 C
80 C
RT9809-20CV
Supp
ly Curre
nt I
SS
(
A)
Supply Current vs. Input Voltage
0
1
2
3
4
0
1
2
3
4
5
6
Input Voltage V
IN
(V)
-30 C
25 C
80 C
RT9809-24CV
Reset Threshold Deviation vs. Temp.
1.9
2.3
2.7
3.1
3.5
3.9
4.3
4.7
5.1
-40
-15
10
35
60
85
Temperture ( C)
T
h
res
h
o
l
d
(V
)
2V
2.4V
3V
4.5V
5V
Supply Current vs. Input Voltage
0
1
2
3
4
5
0
1
2
3
4
5
6
Input Voltage V
IN
(V)
-30 C
25 C
80 C
RT9809-45CV
Supp
ly Curre
nt I
SS
(
A)
Supp
ly Curre
nt I
SS
(
A)
Supply Current vs. Input Voltage
0
1
2
3
4
0
1
2
3
4
5
6
Input Voltage V
IN
(V)
-30 C
25 C
80 C
RT9809-30CV
Supp
ly Curre
nt I
SS
(
A)
Supply Current vs. Input Voltage
0
1
2
3
4
5
0
1
2
3
4
5
6
Input Voltage V
IN
(V)
-30 C
25 C
80 C
RT9809-50CV
Supp
ly Curre
nt I
SS
(
A)
Preliminary
RT9809
DS9809-02 July 2002
www.richtek.com
5
Power-Down Reset Delay vs. Temp.
0.0
1.0
2.0
3.0
4.0
-40
-15
10
35
60
85
Temperature ( C)
V
drop
= 150mV
RT9809-20CV
V
drop
= 200mV
V
drop
= 250mV
Power-D
ow
n Reset D
e
lay (
s)
Power-Down Reset Delay vs. Temp.
0.0
0.3
0.6
0.9
1.2
1.5
-40
-15
10
35
60
85
Temperature ( C)
V
drop
= 150mV
RT9809-30CV
V
drop
= 200mV
V
drop
= 250mV
Power-D
ow
n Reset D
e
lay (
s)
Power-Down Reset Delay vs. Temp.
0.0
0.5
1.0
1.5
2.0
2.5
3.0
-40
-15
10
35
60
85
Temperature ( C)
V
drop
= 150mV
RT9809-24CV
V
drop
= 200mV
V
drop
= 250mV
Power-D
ow
n Reset D
e
lay (
s)
Power-Down Reset Delay vs. Temp.
0.0
0.3
0.6
0.9
1.2
1.5
-40
-15
10
35
60
85
Temperature ( C)
V
drop
= 150mV
RT9809-45CV
V
drop
= 200mV
V
drop
= 250mV
Power-D
ow
n Reset D
e
lay (
s)
Power-Down Reset Delay vs. Temp.
0.0
0.3
0.6
0.9
1.2
1.5
-40
-15
10
35
60
85
Temperature ( C)
V
drop
= 150mV
RT9809-50CV
V
drop
= 200mV
V
drop
= 250mV
Power-D
ow
n Reset D
e
lay (
s)
Power-Up reset Timeout vs. Temp.
50
100
150
200
250
300
350
-40
-15
10
35
60
85
Temperature ( C)
3V
4.5V
5V
2.4V
2V
Power-Up Reset Timeout (ms)
RT9809
Preliminary
www.richtek.com
DS9809-02 July 2002
6
Output Voltage vs. Input Voltage
0
1
2
3
4
5
6
7
0.0
1.0
2.0
3.0
4.0
5.0
6.0
Input Voltage V
IN
(V)
O
u
t
put
V
o
l
t
a
g
e
V
OU
T
(V
)
2.0V
2.4V
4.5V
3.0V
5.0V
T
A
= 25
C
Output Delay Time vs. Load Capacitance
1
10
100
1000
0.0001
0.001
0.01
0.1
Load Capacitance C
OUT
(uF)
O
u
t
put
D
e
l
a
y
T
i
m
e
t
P
(m
s
)
5V
4.5V
3V
2V
2.4V
T
A
= 25
C
Nch Driver Output Current vs. V
DS
0
1
2
3
4
5
6
7
0
0.5
1
1.5
2
2.5
3
V
DS
(V)
O
u
t
put
C
u
r
r
e
nt
I
OU
T
(m
A
)
1.7V
1.5V
T
A
= 25
C
RT9809-20CV
Nch Driver Output Current vs. V
DS
0
2
4
6
8
10
12
0
0.5
1
1.5
2
2.5
3
V
DS
(V)
O
u
t
put
C
u
r
r
e
nt
I
OU
T
(m
A
)
2.2V
2.0V
1.5V
T
A
= 25
C
RT9809-24CV
Nch Driver Output Current vs. V
DS
0
3
6
9
12
15
18
0
0.5
1
1.5
2
2.5
3
V
DS
(V)
O
u
t
put
C
u
r
r
e
nt
I
OUT
(m
A
)
1.5V
2.0V
2.8V
T
A
= 25
C
RT9809-30CV
Pch Driver Output Current vs. Input Voltage
0
5
10
15
20
25
0
1
2
3
4
5
6
Input Voltage (V)
O
u
t
put
C
u
r
r
e
nt
(
m
A
)
V
DS
= 2.1V
1.5V
1.0V
0.5V
RT9809-29CV
T
A
= 25
C
Preliminary
RT9809
DS9809-02 July 2002
www.richtek.com
7
Nch Driver Output Current vs. V
DS
0
6
12
18
24
30
36
0
1
2
3
4
V
DS
(V)
O
u
t
put
C
u
r
r
e
nt
I
OUT
(m
A
)
2.0V
2.5V
4.0V
3.5V
3.0V
1.5V
T
A
= 25
C
RT9809-45CV
Nch Driver Output Current vs. V
DS
0
8
16
24
32
40
0
1
2
3
4
5
V
DS
(V)
Output Current I
OU
T
(mA)
2.0V
2.5V
4.0V
3.5V
3.0V
1.5V
4.5V
T
A
= 25
C
RT9809-50CV
Nch Driver Output Current vs. Input Voltage
0
2
4
6
8
10
0
0.5
1
1.5
2
2.5
3
Input Voltage V
IN
(V)
Output Current I
OU
T
(mA)
-30 C
25 C
80 C
RT9809-20CV
V
DS
= 0.5V
Nch Driver Output Current vs. Input Voltage
0
2
4
6
8
10
0
0.5
1
1.5
2
2.5
3
Input Voltage V
IN
(V)
Output Current I
OU
T
(mA)
-30 C
25 C
80 C
RT9809-24CV
V
DS
= 0.5V
Nch Driver Output Current vs. Input Voltage
0
2
4
6
8
10
12
0
0.5
1
1.5
2
2.5
3
3.5
Input Voltage V
IN
(V)
Output Current I
OU
T
(mA)
-30 C
25 C
80 C
RT9809-30CV
V
DS
= 0.5V
Nch Driver Output Current vs. Input Voltage
0
2
4
6
8
10
12
14
16
0
1
2
3
4
5
Input Voltage V
IN
(V)
Output Current I
OU
T
(mA)
-30 C
25 C
80 C
RT9809-45CV
V
DS
= 0.5V
RT9809
Preliminary
www.richtek.com
DS9809-02 July 2002
8
Nch Driver Output Current vs. Input Voltage
0
3
6
9
12
15
18
0
1
2
3
4
5
6
Input Voltage V
IN
(V)
Output Current I
OU
T
(mA)
-30 C
25 C
80 C
RT9809-50CV
V
DS
= 0.5V
Preliminary
RT9809
DS9809-02 July 2002
www.richtek.com
9
Package Information
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min
Max
Min
Max
A
0.889
1.295
0.035
0.051
A1
--
0.152
--
0.006
B
1.397
1.803
0.055
0.071
b
0.356
0.508
0.014
0.020
C
2.591
2.997
0.102
0.118
D
2.692
3.099
0.106
0.122
e
1.803
2.007
0.071
0.079
H
0.102
0.254
0.004
0.010
L
0.356
0.610
0.014
0.024
SOT-23 Plastic Surface Mount
L
H
b
A
A1
D
e
B
C
RT9809
Preliminary
www.richtek.com
DS9809-02 July 2002
10
RICHTEK TECHNOLOGY CORP.
Headquarter
5F, No. 20, Taiyuen Street, Chupei City
Hsinchu, Taiwan, R.O.C.
Tel: (8863)5526789 Fax: (8863)5526611
RICHTEK TECHNOLOGY CORP.
Taipei Office (Marketing)
8F-1, No. 137, Lane 235, Paochiao Road, Hsintien City
Taipei County, Taiwan, R.O.C.
Tel: (8862)89191466 Fax: (8862)89191465
Email: marketing@richtek.com
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