SSC SS8038L400GT72

SS8037/8(G)
Microprocessor Reset IC
FEATURES
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- powered circuits.
Precision monitoring of +3V, +3.3V, and +5V
power-supply voltages
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 VCC = +1V
Power supply transient immunity
No external components
SOT23-3 package
These circuits perform a single function: they assert a
reset signal whenever the VCC supply voltage declines
below a preset threshold, keeping it asserted for at least
140ms after VCC 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 VCC. 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 VCC,
and the outputs are guaranteed to be in the correct logic
state for VCC down to 1V.
APPLICATIONS
Computers
Controllers
Intelligent instruments
Critical µP and µC power monitoring
Portable / battery-powered equipment
Automotive
Low supply current makes the SS8037/8 ideal for use
in portable equipment. They are available in a 3-pin
SOT23-3 package.
This device is supplied with Pb-free lead finish (second-level interconnect).
PIN CONFIGURATION
TYPICAL APPLICATION
3
VCC
V CC
V CC
R PULL-UP*
SS8037/8
1
2
SOT23-3
RESET
(RESET)
GND
µP
RESET
INPUT
GND
*SS8038 ONLY
10/6/2004 Rev.2.20
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SS8037/8(G)
ORDERING INFORMATION
SS803xxxxxGT7x
Pin Option
GT7: Pb-free SOT-23-3
Threshold Voltage Option
PART NUMBER
THRESHOLD VOLTAGE OPTION
SS8037L : Push-Pull Active Low Output
SS8037H : Push-Pull Active High Output
SS8038L : Open-Drain Output
* xxx specifies the threshold voltage.
e.g. 263 denotes the 2.63V threshold voltage.
PIN OPTION
1:
1
2
RESET
GND
3
VCC
2:
RESET
VCC
GND
3:
GND
RESET
VCC
4:
GND
VCC
RESET
5:
VCC
GND
RESET
6:
VCC
RESET
GND
*RESET for SS8037H
SELECTION GUIDE AND MARKING INFORMATION
PART/SUFFIX
SS8038L463GT71
SS8038L438GT71
SS8038L400GT71
SS8038L308GT71
SS8038L293GT71
SS8038L263GT71
SS8037H463GT71
SS8037H438GT71
SS8037H400GT71
SS8037H308GT71
SS8037H293GT71
SS8037H263GT71
SS8037L463GT71
SS8037L438GT71
SS8037L400GT71
SS8037L308GT71
SS8037L293GT71
SS8037L263GT71
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.
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SS8037/8(G)
SELECTION GUIDE AND MARKING INFORMATION (cont.)
PART/SUFFIX
SS8038L463GT72
SS8038L438GT72
SS8038L400GT72
SS8038L308GT72
SS8038L293GT72
SS8038L263GT72
SS8037H463GT72
SS8037H438GT72
SS8037H400GT72
SS8037H308GT72
SS8037H293GT72
SS8037H263GT72
SS8037L463GT72
SS8037L438GT72
SS8037L400GT72
SS8037L308GT72
SS8037L293GT72
SS8037L263GT72
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
TOP MARK
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
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
SS8038L463GT73
SS8038L438GT73
SS8038L400GT73
SS8038L308GT73
SS8038L293GT73
SS8038L263GT73
SS8037H463GT73
SS8037H438GT73
SS8037H400GT73
SS8037H308GT73
SS8037H293GT73
SS8037H263GT73
SS8037L463GT73
SS8037L438GT73
SS8037L400GT73
SS8037L308GT73
SS8037L293GT73
SS8037L263GT73
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
690Jx
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.
10/6/2004 Rev.2.20
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SS8037/8(G)
ABSOLUTE MAXIMUM RATINGS
All terminal voltages with respect to GND
VCC.……………………………..…….…….-0.3V to +6.0V
RESET, RESET (push-pull)....…....-0.3V to (VCC + 0.3V)
RESET (open drain)...….......................-0.3V to +6.0V
Input Current, VCC ............................….................20mA
Output Current, RESET, RESET ........................20mA
Continuous Power Dissipation (TA = +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
(VCC = full range, TA = -40°C to +105°C, unless otherwise noted. Typical values are at TA = +25°C, VCC = 5V for
463/438/400 versions, VCC= 3.3V for 308/293 versions, and VCC = 3V for 263 version.) (Note 1)
PARAMETER
SYMBOL
VCC Range
Supply Current (SOT-23)
ICC
CONDITION
5.5
TA = -40°C +105°C
1.2
5.5
TA = -40°C +105°C
SS803xx438x
SS803xx400x
VTH
SS803xx308x
SS803xx293x
SS803xx263x
10/6/2004 Rev.2.20
TYP MAX UNITS
1.0
SS803xx463x
Reset Threshold
MIN
TA = 0°C +70°C
VCC<5.5V, 803xx463/438/400x
22
30
VCC<3.6V, 803xx308/293/263x
10
23
TA = +25°C
4.56
TA = -40°C to +85°C
4.50
4.63
TA = +85°C to +105°C
4.40
TA = +25°C
4.31
TA = -40°C to +85°C
4.25
TA = +85°C to +105°C
4.16
TA = +25°C
3.93
TA = -40°C to +85°C
3.89
4.10
TA = +85°C to +105°C
3.80
4.20
TA = +25°C
3.04
TA = -40°C to +85°C
3.00
TA = +85°C to +105°C
2.92
TA = +25°C
2.89
TA = -40°C to +85°C
2.85
3.00
TA = +85°C to +105°C
2.78
3.08
µA
4.70
4.75
4.86
4.38
4.45
4.50
4.56
4.00
3.08
4.06
3.11
V
3.15
3.23
2.93
2.63
2.96
TA = +25°C
2.59
TA = -40°C to +85°C
2.55
2.70
TA = +85°C to +105°C
2.50
2.76
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V
2.66
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SS8037/8(G)
ELECTRICAL CHARACTERISTICS (Cont.)
(VCC = full range, TA = -40°C to +105°C, unless otherwise noted. Typical values are at TA = +25°C, VCC = 5V for
463/438/400 versions, VCC= 3.3V for 308/293 versions, and VCC = 3V for 263 version.) (Note 1)
PARAMETER
SYMBOL
Reset Threshold Tempco
VCC to Reset Delay (Note 2)
CONDITION
MIN
40
7
VCC = VTH to (VTH – 100mV)
Reset Active Timeout Period
RESET Output Current Low (push-pull active low,
and open-drain active-low, SS8037L and
SS8038L)
RESET Output Current High (push-pull active
low, SS8037L)
RESET Output Current Low (push-pull active high,
SS8037H)
RESET Output Current High (push-pull active high,
SS8037H)
RESET Open-Drain Output Leakage Current
(SS8038L)
IOL
IOH
IOL
IOH
VCC = VTH max,
SS803xx463/438/400
280
VCC = VTH max,
SS803xx308/293/263
140
VCC = 2.5V, V RESET = 0.5V
VCC = 5V, V RESET = 4.5V,
SS8037L463/438/400
VCC = 3.3V, V RESET = 2.8V,
SS8037L308/293
VCC = 3V, V RESET = 2.5V,
SS8037L263
VCC = 5V, VRESET = 0.5V,
SS8037H463/438/400
VCC = 3.3V, VRESET = 0.5V,
SS8037H308/293
VCC = 3V, VRESET = 0.5V,
SS8037H263
VCC = 2.5V, VRESET = 2V
TYP MAX UNITS
ppm/°C
µs
640
ms
550
8
mA
4.5
mA
3
2
16
mA
12
10
2
VCC > VTH, RESET de-asserted
mA
1
µA
Note 1: Production testing done at TA = +25°C; limits over temperature guaranteed by design.
Note 2: RESET output is for SS8037L/38L; RESET output is for SS8037H.
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SS8037/8(G)
TYPICAL PERFORMANCE CHARACTERISTICS
(VCC = full range, TA = -40°C to +105°C, unless otherwise noted. Typical values are at TA = +25°C, VCC = 5V for
463/438/400 versions, VCC= 3.3V for 308/293 versions, and VCC = 3V for 263 version.)
Supply Current vs.Temperature
(No Load)
Power-up Reset Timeout
vs. Temperature
600
803xx463/438/400, Vcc=5V
15
10
803xx308/293/263, Vcc=3.3V
5
803xxx463/438/400/308/293/263, Vcc=1V
Power-up Reset Timeout (ms)
Supply Current (µA)
20
803xx463/438/400
500
400
300
803xx308/293/263
200
100
0
0
-40
-20
0
20
40
60
-40
80
-20
Temperature (°C)
20
40
60
80
Temperature (°C)
Power-down Reset Delay vs.
Temperature (803xx308/293/263)
Power-down Reset Delay vs.
Temperature (803xx463/438/400)
140
VOD = VTH - VCC
60
50
VOD = 10mV
40
VOD = 20mV
30
20
VOD = 100mV
10
VOD = 200mV
0
-40
-20
0
20
40
Power-Down Reset Delay (u s)
70
Power-down Reset Delay (us)
0
VOD = VTH - VCC
120
100
VOD = 10mV
80
VOD = 20mV
60
40
VOD = 100mV
20
0
60
80
-40
-20
Temperature (°C)
0
20
40
60
80
Temperature (°C)
Normalized Reset Threshold
vs. Temperature
1.002
Normalized Threshold
1
0.998
0.996
0.994
0.992
0.99
0.988
-40
-20
0
20
40
60
80
Temperature (°C)
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SS8037/8(G)
PIN DESCRIPTION
PIN
NAME
1
GND
FUNCTION
Ground
RESET Output remains low while VCC is below the reset threshold, and for at least 140ms after VCC
rises above the reset threshold.
RESET Output remains high while VCC is below the reset threshold, and for at least 140ms after VCC
rises above the reset threshold.
(SS8037L/38L)
2
RESET
(SS8037H)
VCC
3
Supply Voltage (+5V, +3.3V, +3.0V)
APPLICATIONS INFORMATION
A microprocessor’s (µP’s) reset input starts the µP in a
known state. The SS8037L/H and 8038L assert reset
to prevent code-execution errors during power-up,
power-down, or brownout conditions. They assert a reset
signal whenever the VCC supply voltage declines below a
preset threshold, keeping it asserted for at least 140ms
after VCC has risen above the reset threshold. The
SS8038L uses an open-drain output, and the
SS8037L/37H have push-pull output stages. Connect a
pull-up resistor on the SS8308L’s RESET output to any
supply between 0 and 5.5V.
600
Maximum Transient Duration(us)
500
400
300
200
803xx 463/438/400
100
803xx308/293/263
0
1
10
100
1000
Reset Comparator Overdrive, VTH - V CC (mV)
Figure 1. Maximum Transient Duration Without
Causing a Reset Pulse vs. Reset Comparator Overdrive
Fig 2. RESET Valid to V CC = Ground Circuit
Figure 1 shows typical transient duration vs. reset comparator overdrive, for which the SS8037L/H/8038L
do not generate a reset pulse. The graph was generated
using a negative-going pulse applied to VCC, starting 0.5V
above the actual reset threshold and ending below it by
the magnitude indicated (reset comparator overdrive).
The graph indicates the maximum pulse width a negative-going VCC transient can have without causing a reset
pulse. As the magnitude of the transient increases (goes
farther below the reset threshold), the maximum allowable pulse width decreases. Typically, for the SS803xx
463 and SS803xx438, a V CC transient that goes
100mV below the reset threshold and lasts 7µs or less
will not cause a reset pulse. A 0.1µF bypass capacitor
mounted as close as possible to the VCC pin provides
additional transient immunity.
Ensuring a Valid Reset Output Down to VCC = 0
When VCC falls below 1V, the SS8037 RESET output
no longer sinks current—it becomes an open circuit.
Therefore, high-impedance CMOS logic inputs connected to RESET can drift to undetermined voltages.
This presents no problem in most applications since most
µP and other circuitry is inoperative with VCC below 1V.
However, in applications where RESET must be valid
down to 0V, adding a pull-down resistor to RESET
causes any stray leakage currents to flow to ground,
holding RESET low (Figure 2). R1’s value is not critical;
100kΩ is large enough not to load RESET and small
enough to pull RESET to ground.
VCC
A 100kΩ pull-up resistor to VCC is also recommended for
the SS8038L if RESET is required to remain valid for
VCC < 1V.
SS8037
RESET
GND
10/6/2004 Rev.2.20
Negative-Going VCC Transients
In addition to issuing a reset to the µP during power-up,
power-down,
and
brownout
conditions,
the
SS8037L/H/8038L are relatively immune to shortduration negative-going VCC transients (glitches).
R1
100k
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SS8037/8(G)
VCC
VCC
VCC
RPULL-UP
µP
8038
RESET MOTOROLA
INPUT
68HCXX
RESET
GND
GND
Figure 3. Interfacing to µPs with bidirectional
reset I/O
+5.0V
+3.3V
VCC
VCC
RPULL-UP
8038
RESET
GND
Interfacing to µPs with Bidirectional Reset Pins
Since the RESET output on the SS8038L is open drain,
this device interfaces easily with µPs that have bidirectional reset pins, such as the Motorola 68HC11. Connecting the µP supervisor’s RESET output directly to
the microcontroller’s (µC’s) RESET pin with a single
pull-up resistor allows either device to assert reset (Figure 3).
8038L Open-Drain RESET Output Allows Use with
Multiple Supplies
Generally, the pull-up connected to the SS8038L will
connect to the supply voltage that is being monitored at
the IC’s VCC pin. However, some systems may use the
open-drain output to level-shift from the monitored supply
to reset circuitry powered by some other supply (Figure
4). Note that as the SS8038L’s V CC decreases below 1V,
so does the IC’s ability to sink current at RESET . Also,
with any pull-up, RESET will be pulled high as VCC decays toward 0. The voltage where this occurs depends
on the pull-up resistor value and the voltage to which it is
connected.
5V SYSTEM
RESET
INPUT
GND
Figure 4. SS8038L open-drain RESET output
allows use with multiple supplies
Benefits of Highly Accurate Reset Threshold
Most µP supervisor ICs have reset threshold voltages
between 5% and 10% below the value of nominal supply
voltages. This ensures a reset will not occur within 5% of
the nominal supply, but will occur when the supply is 10%
below nominal.
When using ICs rated at only the nominal supply ±5%,
this leaves a zone of uncertainty where the supply is between 5% and 10% low, and where the reset may or
may not be asserted.
The SS803xx463/803xx308 use highly accurate circuitry
to ensure that reset is asserted close to the 5% limit, and
long before the supply has declined to 10% below nominal.
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SS8037/8(G)
PHYSICAL DIMENSIONS
C
D
L
E
H
e
θ1
A
A2
A1
Feed Direction
SOT23 Package Orientation
b
SOT 23 (T7) Package
Note:
1.Package body sizes exclude mold flash protrusions or gate burrs
2.Tolerance ±0.1000 mm (4mil) unless otherwise specified
3.Coplanarity: 0.1000mm
4.Dimension L is measured in gage plane
MIN
DIMENSIONS IN MILLIMETERS
NOM
MAX
A
1.00
1.10
1.30
A1
0.00
-----
0.10
A2
0.70
0.80
0.90
b
0.35
0.40
0.50
C
0.10
0.15
0.25
D
2.70
2.90
3.10
E
1.40
1.60
1.80
SYMBOLS
e
-----
1.90(TYP)
-----
H
2.60
2.80
3.00
L
0.37
------
-----
1º
5º
9º
Θ1
Information furnished by Silicon Standard Corporation is believed to be accurate and reliable. However, Silicon Standard Corporation makes no
guarantee or warranty, express or implied, as to the reliability, accuracy, timeliness or completeness of such information and assumes no
responsibility for its use, or for infringement of any patent or other intellectual property rights of third parties that may result from its
use. Silicon Standard reserves the right to make changes as it deems necessary to any products described herein for any reason, including
without limitation enhancement in reliability, functionality or design. No license is granted, whether expressly or by implication, in relation to
the use of any products described herein or to the use of any information provided herein, under any patent or other intellectual property rights of
Silicon Standard Corporation or any third parties.
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