SS809/810G
3-Pin Microprocessor Reset Circuits
FEATURES
Ultra-low supply current 1µA (typ.)
Guaranteed reset valid to Vcc=0.9V
Available in three output types:
Open-drain active low (SS809N-xxGx)
Push-pull active low
(SS809-xxGx)
Push-pull active high (SS810-xxGx)
Power-on reset pulse width min. 140ms
Internally fixed threshold 2.3V, 2.6V, 2.9V, 3.1V,
4.0V, 4.4V, 4.6V
Tight voltage threshold tolerance: 1.5%
Packaged in RoHS-compliant SOT-23-3
These devices provide valid signals in applications
with Vcc ranging from 6.0V down to 0.9V. The reset
signal lasts for a minimum period of 140ms whenever the
V
CC
supply voltage falls below a preset threshold. Both
the SS809G and SS810G were designed with a reset
comparator to help identify invalid signals lasting less
than 140ms. The only difference between the two
devices is that one has an active -low RESET output
and the other an active -high RESET output .
DESCRIPTION
The SS809G and SS810G are low-power microprocessor
(µP) supervisory circuits used to monitor power supplies
in µP and digital systems. They improve circuit reliability
and reduce cost by eliminating external components.
APPLICATIONS
l
l
l
l
Notebook Computers
Digital Still Cameras
PDAs
Critical Microprocessor Monitoring
Low supply current (1µA) makes the SS809G and SS810G
ideal for portable equipment. The devices are available in
a SOT-23-3 package.
TYPICAL APPLICATION CIRCUIT
V
CC
VCC
SS809G
( SS810G)
RESET
(RESET)
GND
VCC
µP
RESET
INPUT
GND
Push -Pull Output
9/20/2006 Rev.3.01
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SS809/810G
ABSOLUTE MAXIMUM RATINGS
V
CC
RESET,
RESET
Input Current (V
CC
)
Output Current (RESET or
RESET
)
Continuous Power Dissipation (T
A
= +70°C)
Operating Junction Temperature Range
Storage Temperature Range
Lead Temperature (Soldering) 10 sec
-0.3V ~6.5V
-0.3V ~ (VCC+0.3V)
20mA
20mA
320mW
-40°C ~ 85°C
- 65°C ~ 125°C
260°C
Note1: Any stress beyond the Absolute Maximum Ratings above may cause permanent damage to the device.
TEST CIRCUIT
3
2
Vin
VCC
GND
RESET
Iin
SS809G
1
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SS809/810G
ELECTRICAL CHARACTERISTICS
(Typical values are at T
A
=25°C, unless otherwise specified.)
PARAMETER
Operating Voltage Range
Supply Current
TEST CONDITIONS
V
CC
= V
TH
+0.1V
SS809-23
SS809-26
SS809-29
Reset Threshold
V
TH
SS809-31
SS809-40
SS809-44
SS809-46
V
CC
to Reset Delay
Reset Active Timeout Period
T
RD
T
RP
V
OH
V
OL
V
OH
V
OL
T
A
=+25°C
T
A
= -40°C to +85°C
T
A
=+25°C
T
A
= -40°C to +85°C
T
A
=+25°C
T
A
= -40°C to +85°C
T
A
=+25°C
T
A
= -40°C to +85°C
T
A
=+25°C
T
A
= -40°C to +85°C
T
A
=+25°C
T
A
= -40°C to +85°C
T
A
=+25°C
T
A
=-40°C to +85°C
T
A
=+25°C
T
A
= -40°C to +85°C
2.265
2.254
2.561
2.548
2.857
2.842
3.054
3.038
3.940
3.920
4.334
4.312
4.531
4.508
20
140
100
0.8V
CC
0.2Vcc
0.8V
CC
0.2Vcc
230
560
1030
4.6
4.4
4.0
3.1
2.9
2.6
MIN.
0.9
1
2.3
TYP.
MAX.
6
3
2.335
2.346
2.639
2.652
2.944
2.958
3.147
3.162
4.060
4.080
4.466
4.488
4.669
4.692
µS
mS
V
V
UNIT
V
µA
SYMBOL
V
CC
I
CC
V
CC
=V
TH
to (V
TH
-0.1V), V
TH
=3.1V
V
CC
= V
TH ( MAX)
RESET
Output Voltage
V
CC
=V
TH
+0.1V, I
SOURCE
=1mA
V
CC
=V
TH
- 0.1V, I
SINK
=1mA
V
CC
=V
TH
-0.1V, I
SOURCE
=1mA
V
CC
=V
TH
+0.1V, I
SINK
=1mA
RESET Output Voltage
V
Note2:
RESET
output is for the SS809G; RESET output is for the SS810G.
Note3: Specifications for operating temperature ranges from -40°C to 85°C are guaranteed by Statistical Quality
Controls (SQC), with no production testing.
9/20/2006 Rev.3.01
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SS809/810G
TYPICAL PERFORMANCE CHARACTERISTICS
1.5
1.4
120
Power -Down Reset Delay (µs )
110
100
90
80
70
60
50
40
30
20
10
0
-60
-40
-20
0
20
40
V
TH
=2.3V
Supply Current (µA)
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
-40
-
20
0
20
V
TH
=2.3V
V
O D
=V
TH
-V
CC
V
TH
=3.1V
V
TH
=4.6V
V
OD
=50mV
V
OD
=100mV
V
OD
=200mV
40
60
80
100
60
80
100
Temperature (
°
C)
Fig 1 Supply Current vs. Temperature
240
Temperature (
°
C)
Fig 2 Power-Down Reset Delay vs. Temperature
Power -Down Reset Delay (µs )
Power -Down Reset Delay (µs )
220
200
180
160
140
120
100
80
60
40
20
0
-
60
-
40
-20
V
TH
=3.1V
V
O D
=V
TH
-V
CC
400
V
OD
=50mV
V
TH
=4.6V
V
OD
=V
TH
-V
CC
300
V
OD
=50mV
200
V
OD
=100mV
100
V
OD
=100mV
V
OD
=200mV
0
20
40
60
80
100
V
OD
=200mV
0
-60
-
40
-
20
0
20
40
60
80
100
Temperature (
°
C)
Fig 3 Power-Down Reset Delay vs. Temperature
600
Temperature (
°
C)
Fig 4 Power-Down Reset Delay vs. Temperature
Normalized Reset Threshold (V)
1.010
1.005
1.000
0.995
0.990
0.985
-40
-20
0
V
TH
=4.6V
Power -Up Reset Timeout (ms)
1.015
500
400
V
TH
=3.1V
300
200
V
TH
=3.1V
V
TH
=4.6V
V
TH
=2.3V
V
TH
=2.3V
100
0
-60
20
40
60
80
100
-40
-20
0
20
40
60
80
100
Temperature (
°
C)
Fig 5 Normalized Reset Threshold vs. Temperature
Temperature (
°
C)
Fig 6 Power-Up Reset Timeout vs. Temperature
9/20/2006 Rev.3.01
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