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SS8037/8(G)
Microprocessor Reset IC
FEATURES
Precision monitoring of +3V, +3.3V, and +5V power-supply voltages
DESCRIPTION
The SS8037/8 are microprocessor (P) supervisory circuits used to monitor the power supplies in P 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. 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. 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 10A Guaranteed reset valid to VCC = +1V Power supply transient immunity No external components SOT23-3 package
APPLICATIONS
Computers Controllers Intelligent instruments Critical P and C power monitoring Portable / battery-powered equipment Automotive
This device is supplied with Pb-free lead finish (second-level interconnect).
PIN CONFIGURATION
3 VCC
TYPICAL APPLICATION
V CC
V CC
* R PULL-UP
SS8037/8
1 2 RESET (RESET) GND
P
RESET INPUT GND
SOT23-3
*SS8038 ONLY
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SS8037/8(G)
ORDERING INFORMATION
SS803xxxxxGT7x
Pin Option
GT7: Pb-free SOT-23-3
Threshold Voltage Option
PART NUMBER
SS8037L : Push-Pull Active Low Output SS8037H : Push-Pull Active High Output SS8038L : 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 VCC
RESET
3 VCC GND VCC
RESET RESET
GND GND VCC VCC
VCC GND
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
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
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.
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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 = +70C) 3-Pin SOT23 (derate 4mW/C above +70C)....320mW
Operating Temperature Range ...........-40C to +105C Storage Temperature Range..............-65C to +150C Lead Temperature (soldering, 10s) ..................+300C
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 = -40C to +105C, unless otherwise noted. Typical values are at TA = +25C, VCC = 5V for 463/438/400 versions, VCC= 3.3V for 308/293 versions, and VCC = 3V for 263 version.) (Note 1) PARAMETER
VCC Range Supply Current (SOT-23) ICC
SYMBOL
TA = 0C +70C TA = -40C +105C
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 A
TA = -40C +105C
VCC<5.5V, 803xx463/438/400x VCC<3.6V, 803xx308/293/263x TA = +25C 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 TA = -40C to +85C TA = +85C to +105C TA = +25C
4.63
SS803xx463x
SS803xx438x
TA = -40C to +85C TA = +85C to +105C TA = +25C
SS803xx400x Reset Threshold VTH SS803xx308x
TA = -40C to +85C TA = +85C to +105C TA = +25C TA = -40C to +85C TA = +85C to +105C TA = +25C
SS803xx293x
TA = -40C to +85C TA = +85C to +105C TA = +25C
SS803xx263x
TA = -40C to +85C TA = +85C to +105C
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SS8037/8(G)
ELECTRICAL CHARACTERISTICS (Cont.)
(VCC = full range, TA = -40C to +105C, unless otherwise noted. Typical values are at TA = +25C, VCC = 5V for 463/438/400 versions, VCC= 3.3V for 308/293 versions, and VCC = 3V for 263 version.) (Note 1) PARAMETER
Reset Threshold Tempco VCC to Reset Delay (Note 2)
SYMBOL
CONDITION
VCC = VTH to (VTH - 100mV) VCC = VTH max, SS803xx463/438/400 VCC = VTH max, SS803xx308/293/263
MIN
TYP MAX UNITS
40 7 ppm/C s 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)
IOL
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 VCC > VTH, RESET de-asserted
8
mA
4.5 3 2 16 12 10 2 1 mA A mA mA
RESET Output Current High (push-pull active low, SS8037L)
IOH
RESET Output Current Low (push-pull active high, SS8037H)
IOL
RESET Output Current High (push-pull active high, SS8037H)
IOH
RESET Open-Drain Output Leakage Current (SS8038L)
Note 1: Production testing done at TA = +25C; 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 = -40C to +105C, unless otherwise noted. Typical values are at TA = +25C, 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)
20
Power-up Reset Timeout vs. Temperature
600 Power-up Reset Timeout (ms) 500 400 300
803xx308/293/263 803xx463/438/400
Supply Current (A)
15
803xx463/438/400, Vcc=5V
10
803xx308/293/263, Vcc=3.3V
200 100 0
5
803xxx463/438/400/308/293/263, Vcc=1V
0
-40 -20 0 20 40 60 80
-40
-20
0
20
40
60
80
Temperature (C)
Temperature (C)
Power-down Reset Delay vs. Temperature (803xx308/293/263)
70 Power-down Reset Delay (us)
Power-Down Reset Delay (u s) VOD = VTH - VCC
Power-down Reset Delay vs. Temperature (803xx463/438/400)
140
VOD = VTH - VCC
60 50
VOD = 10mV
120 100 80
VOD = 20mV VOD = 10mV
40
VOD = 20mV
30 20
VOD = 100mV
60 40 20 0
VOD = 100mV
10 0
-40 -20 0
VOD = 200mV
20 40 60 80
-40
-20
0
20
40
60
80
Temperature (C)
Temperature (C)
Normalized Reset Threshold vs. Temperature
1.002 1
Normalized Threshold
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
1 2
NAME
GND (SS8037L/38L) RESET (SS8037H) VCC Ground
FUNCTION
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.
Supply Voltage (+5V, +3.3V, +3.0V)
3
APPLICATIONS INFORMATION
A microprocessor's (P's) reset input starts the P 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. Negative-Going VCC Transients In addition to issuing a reset to the P during power-up, power-down, and brownout conditions, the SS8037L/H/8038L are relatively immune to shortduration negative-going VCC transients (glitches). 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 7s or less will not cause a reset pulse. A 0.1F 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 P 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; 100k is large enough not to load RESET and small enough to pull RESET to ground. A 100k pull-up resistor to VCC is also recommended for the SS8038L if RESET is required to remain valid for VCC < 1V.
R1 100k
600
500
Maximum Transient Duration(us)
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
VCC
SS8037
RESET
GND
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SS8037/8(G)
VCC
VCC RPULL-UP
VCC
8038
RESET
P
RESET MOTOROLA INPUT 68HCXX
Interfacing to Ps with Bidirectional Reset Pins Since the RESET output on the SS8038L is open drain, this device interfaces easily with Ps that have bidirectional reset pins, such as the Motorola 68HC11. Connecting the P supervisor's RESET output directly to the microcontroller's (C'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. Benefits of Highly Accurate Reset Threshold Most P 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.
GND
GND
Figure 3. Interfacing to Ps with bidirectional reset I/O
+5.0V +3.3V
VCC RPULL-UP
VCC
8038
RESET
5V SYSTEM
RESET INPUT
GND
GND
Figure 4. SS8038L open-drain RESET output allows use with multiple supplies
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SS8037/8(G)
PHYSICAL DIMENSIONS
C
D
L
E
H
e
1
A A2 A1 b
Feed Direction SOT23 Package Orientation
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 SYMBOLS
A A1 A2 b C D E e H L
MIN
1.00 0.00 0.70 0.35 0.10 2.70 1.40 ----2.60 0.37 1
DIMENSIONS IN MILLIMETERS NOM
1.10 ----0.80 0.40 0.15 2.90 1.60 1.90(TYP) 2.80 -----5
MAX
1.30 0.10 0.90 0.50 0.25 3.10 1.80 ----3.00 ----9
1
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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