SS8037/8(G)
Microprocessor Reset IC
FEATURES
Precision monitoring of +3V, +3.3V, and +5V
power-supply voltages
DESCRIPTION
The SS8037/8 are microprocessor (µP) supervisory
circuits used to monitor the power supplies in µP and
digital systems. They provide excellent circuit reliability
and low cost by eliminating external components and
adjustments when used with +5V, +3.3V, +3.0V- pow-
ered circuits.
These circuits perform a single function: they assert a
reset signal whenever the V
CC
supply voltage declines
below a preset threshold, keeping it asserted for at least
140ms after V
CC
has risen above the reset threshold.
Reset thresholds suitable for operation with a variety of
supply voltages are available.
The SS8038L has an open-drain output stage, while the
SS8037H/L have push-pull outputs. The SS8038L’s
open-drain
RESET
output requires a pull-up resistor
that can be connected to a voltage higher than V
CC
. The
SS8037L has an active-low
RESET
output, while the
SS8037H has an active-high RESET output. The reset
comparator is designed to ignore fast transients on V
CC
,
and the outputs are guaranteed to be in the correct logic
state for V
CC
down to 1V.
Low supply current makes the SS8037/8 ideal for use
in portable equipment. They are available in a 3-pin
SOT23-3 package.
Fully specified over temperature
Available in three output configurations
Push-pull
RESET
output (SS8037L)
Push-pull RESET output (SS8037H)
Open-drain
RESET
output (SS8038L)
Power-on reset pulse width of 140ms min
Supply current of 10µA
Guaranteed reset valid to V
CC
= +1V
Power supply transient immunity
No external components
SOT23-3 package
APPLICATIONS
Computers
Controllers
Intelligent instruments
Critical µP and µC power monitoring
Portable / battery-powered equipment
Automotive
This device is available with Pb-free lead finish (second-level interconnect) as SS8037G/8038G.
PIN CONFIGURATION
3
V
CC
TYPICAL APPLICATION
V
CC
V
CC
*
R
PULL-UP
SS8037/8
1
2
RESET
(RESET)
GND
µP
RESET
INPUT
GND
SOT23-3
*SS8038 ONLY
9/26/2004 Rev.2.10
www.SiliconStandard.com
1 of 10
SS8037/8(G)
ORDERING INFORMATION
SS803X(G)X XXXT7X
Pin Option
Threshold Voltage Option
Optional Pb-free lead finish
PART NUMBER
SS8037(G)L : Push-Pull Active Low Output
SS8037(G)H : Push-Pull Active High Output
SS8038(G)L : Open-Drain Output
THRESHOLD VOLTAGE OPTION
* xxx specifies the threshold voltage.
e.g. 263 denotes the 2.63V threshold voltage.
PIN OPTION
1
1:
2:
3:
4:
5:
6:
RESET
RESET
2
GND
V
CC
RESET
3
V
CC
GND
V
CC
RESET
RESET
GND
GND
V
CC
V
CC
V
CC
GND
RESET
GND
*RESET for SS8037(G)H
SELECTION GUIDE AND MARKING INFORMATION
PART/SUFFIX
SS8038L463T71
SS8038L438T71
SS8038L400T71
SS8038L308T71
SS8038L293T71
SS8038L263T71
SS8037H463T71
SS8037H438T71
SS8037H400T71
SS8037H308T71
SS8037H293T71
SS8037H263T71
SS8037L463T71
SS8037L438T71
SS8037L400T71
SS8037L308T71
SS8037L293T71
SS8037L263T71
RESET THRESHOLD (V)
4.63
4.38
4.00
3.08
2.93
2.63
4.63
4.38
4.00
3.08
2.93
2.63
4.63
4.38
4.00
3.08
2.93
2.63
OUTPUT TYPE
Open-Drain
Open-Drain
Open-Drain
Open-Drain
Open-Drain
Open-Drain
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
TOP MARK
689Fx
689Ex
689Dx
689Cx
689Bx
689Ax
688Lx
688Kx
688Jx
688Ix
688Hx
688Gx
688Fx
688Ex
688Dx
688Cx
688Bx
688Ax
Note: T71: SOT23
pin-out option 1
Not all product options are released for mass production, please contact
Silicon Standard for availability.
9/26/2004 Rev.2.10
www.SiliconStandard.com
2 of 10
SS8037/8(G)
SELECTION GUIDE AND MARKING INFORMATION (cont.)
PART/SUFFIX
SS8038L463T72
SS8038L438T72
SS8038L400T72
SS8038L308T72
SS8038L293T72
SS8038L263T72
SS8037H463T72
SS8037H438T72
SS8037H400T72
SS8037H308T72
SS8037H293T72
SS8037H263T72
SS8037L463T72
SS8037L438T72
SS8037L400T72
SS8037L308T72
SS8037L293T72
SS8037L263T72
RESET THRESHOLD (V)
4.63
4.38
4.00
3.08
2.93
2.63
4.63
4.38
4.00
3.08
2.93
2.63
4.63
4.38
4.00
3.08
2.93
2.63
OUTPUT TYPE
Open-Drain
Open-Drain
Open-Drain
Open-Drain
Open-Drain
Open-Drain
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
TOP MARK
687Fx
687Ex
687Dx
687Cx
687Bx
687Ax
686Lx
688Kx
6
686Jx
686Ix
686Hx
686Gx
686Fx
686Ex
686Dx
686Cx
686Bx
686Ax
Note: T72: SOT23
pin-out option 2
Not all product options are released for mass production, please contact
Silicon Standard for availability.
PART/SUFFIX
SS8038L463T73
SS8038L438T73
SS8038L400T73
SS8038L308T73
SS8038L293T73
SS8038L263T73
SS8037H463T73
SS8037H438T73
SS8037H400T73
SS8037H308T73
SS8037H293T73
SS8037H263T73
SS8037L463T73
SS8037L438T73
SS8037L400T73
SS8037L308T73
SS8037L293T73
SS8037L263T73
RESET THRESHOLD (V)
4.63
4.38
4.00
3.08
2.93
2.63
4.63
4.38
4.00
3.08
2.93
2.63
4.63
4.38
4.00
3.08
2.93
2.63
OUTPUT TYPE
Open-Drain
Open-Drain
Open-Drain
Open-Drain
Open-Drain
Open-Drain
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
691Fx
691Ex
691Dx
691Cx
691Bx
691Ax
690Lx
690Kx
690Jx3
690Ix
690Hx
690Gx
690Fx
690Ex
690Dx
690Cx
690Bx
690Ax
Note: T73: SOT23
pin-out option 3
Not all product options are released for mass production, please contact
Silicon Standard for availability.
9/26/2004 Rev.2.10
www.SiliconStandard.com
3 of 10
SS8037/8(G)
ABSOLUTE MAXIMUM RATINGS
All terminal voltages with respect to GND
V
CC
.……………………………..…….…….-0.3V to +6.0V
RESET,
RESET
(push-pull)....…....-0.3V to (V
CC
+ 0.3V)
RESET
(open drain)...….......................-0.3V to +6.0V
Input Current, V
CC
............................….................20mA
Output Current, RESET,
RESET
........................20mA
Continuous Power Dissipation (T
A
= +70°C)
3-Pin SOT23 (derate 4mW/°C above +70°C)….320mW
Operating Temperature Range …........-40°C to +105°C
Storage Temperature Range..….….….-65°C to +150°C
Lead Temperature (soldering, 10s) ..…....…......+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not
implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V
CC
= full range, T
A
= -40°C to +105°C, unless otherwise noted. Typical values are at T
A
= +25°C, V
CC
= 5V for
463/438/400 versions, V
CC
= 3.3V for 308/293 versions, and V
CC
= 3V for 263 version.) (Note 1)
PARAMETER
V
CC
Range
Supply Current (SOT-23)
I
CC
SYMBOL
T
A
= 0°C +70°C
T
A
= -40°C +105°C
CONDITION
MIN
1.0
1.2
TYP MAX UNITS
5.5
5.5
22
10
30
23
4.70
4.75
4.86
4.38
4.45
4.50
4.56
4.00
4.06
4.10
4.20
3.08
3.11
3.15
3.23
2.93
2.96
3.00
3.08
2.63
2.66
2.70
2.76
V
V
µA
T
A
= -40°C +105°C
V
CC
<5.5V, 803xx463/438/400x
V
CC
<3.6V, 803xx308/293/263x
T
A
= +25°C
4.56
4.50
4.40
4.31
4.25
4.16
3.93
3.89
3.80
3.04
3.00
2.92
2.89
2.85
2.78
2.59
2.55
2.50
T
A
= -40°C to +85°C
T
A
= +85°C to +105°C
T
A
= +25°C
4.63
SS803xx463x
SS803xx438x
T
A
= -40°C to +85°C
T
A
= +85°C to +105°C
T
A
= +25°C
SS803xx400x
Reset Threshold
V
TH
SS803xx308x
T
A
= -40°C to +85°C
T
A
= +85°C to +105°C
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= +85°C to +105°C
T
A
= +25°C
SS803xx293x
T
A
= -40°C to +85°C
T
A
= +85°C to +105°C
T
A
= +25°C
SS803xx263x
T
A
= -40°C to +85°C
T
A
= +85°C to +105°C
9/26/2004 Rev.2.10
www.SiliconStandard.com
4 of 10
SS8037/8(G)
ELECTRICAL CHARACTERISTICS
(Cont.)
(V
CC
= full range, T
A
= -40°C to +105°C, unless otherwise noted. Typical values are at T
A
= +25°C, V
CC
= 5V for
463/438/400 versions, V
CC
= 3.3V for 308/293 versions, and V
CC
= 3V for 263 version.) (Note 1)
PARAMETER
Reset Threshold Tempco
V
CC
to Reset Delay (Note 2)
SYMBOL
CONDITION
V
CC
= V
TH
to (V
TH
– 100mV)
V
CC
= V
TH
max,
SS803xx463/438/400
V
CC
= V
TH
max,
SS803xx308/293/263
MIN
TYP MAX UNITS
40
7
ppm/°C
µs
640
ms
550
280
140
Reset Active Timeout Period
RESET
Output Current Low (push-pull active low,
and open-drain active-low, SS8037L and
SS8038L)
I
OL
V
CC
= 2.5V, V
RESET
= 0.5V
V
CC
= 5V, V
RESET
= 4.5V,
SS8037L463/438/400
V
CC
= 3.3V, V
RESET
= 2.8V,
SS8037L308/293
V
CC
= 3V, V
RESET
= 2.5V,
SS8037L263
V
CC
= 5V, V
RESET
= 0.5V,
SS8037H463/438/400
V
CC
= 3.3V, V
RESET
= 0.5V,
SS8037H308/293
V
CC
= 3V, V
RESET
= 0.5V,
SS8037H263
V
CC
= 2.5V, V
RESET
= 2V
V
CC
> V
TH
,
RESET
de-asserted
8
mA
4.5
3
2
16
12
10
2
1
mA
µA
mA
mA
RESET
Output Current High (push-pull active
low, SS8037L)
I
OH
RESET Output Current Low (push-pull active high,
SS8037H)
I
OL
RESET Output Current High (push-pull active high,
SS8037H)
I
OH
RESET
Open-Drain Output Leakage Current
(SS8038L)
Note 1: Production testing done at T
A
= +25°C; limits over temperature guaranteed by design.
Note 2:
RESET
output is for SS8037L/38L; RESET output is for SS8037H.
9/26/2004 Rev.2.10
www.SiliconStandard.com
5 of 10
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