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SS8039
Microprocessor Voltage Monitor with Manual Reset
Features
Precision monitoring of +3V, +3.3V, and +5V power-supply voltages
General Description
The SS8039 is a microprocessor (P) supervisory circuit used to monitor the power supplies in P and digital systems. It provides 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.
Fully specified over temperature Available in two output configurations Push-pull RESET output (SS8039L) Push-pull RESET output (SS8039H) Manual reset input Power-on reset pulse width of 140ms min Supply current of 5A Guaranteed reset valid to VCC = +1V Power supply transient immunity No external components 4-Pin SOT-143 package
Applications
Computers Controllers Intelligent instruments Critical P and C power monitoring Portable / battery-powered equipment Automotive
Compatible with the popular "811" series
The SS8039 has a push-pull output stage. The SS8039L has an active-low RESET output, while the SS8039H 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 SS8039 ideal for use in portable equipment, and it is available in a 4-pin SOT-143 package.
Pin Configuration
4
VCC
Typical Application
V CC VCC V CC
GND
1
SS8039
SS8039
MR RESET (RESET) GND
P
RESET INPUT GND
RESET(RESET)
2 SOT143
3
MR
(RESET) for SS8039H (RESET) for SS8039H
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SS8039
Ordering Information
Options are released to production as needed. Please check with Silicon Standard for availability. SS8039X XXX TC XX
Packing - TR: Tape and reel Package type - TC: SOT-143 Threshold voltage - xxx specifies the threshold voltage. Reset active-low (L) or active-high (H)
Example: SS8039H263TCTR
SS8039 with push-pull active-high reset output at 2.63V in SOT-143 package supplied on tape and reel
Absolute Maximum Ratings
Terminal voltages with respect to GND VCC..................................................-0.3V to +6.0V RESET, RESET (push-pull)...........-0.3V to (VCC + 0.3V)
Input Current,VCC...........................................20mA Output Current, RESET, RESET ......................20mA
Continuous Power Dissipation (TA = +70C) SOT-143 (derate 4mW/C above +70C)...........320mW Operating Temperature Range ............-40C to +105C Storage Temperature Range......... .... ...-65C to +150C Lead Temperature (soldering, 10s) ................+300C
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
V CC Range Supply Current ICC
SYMBOL
TA = 0C +70C TA = -40C +105C TA = -40C +105C SS8039x463 SS8039x438 SS8039x400 SS8039x308 SS8039x293 SS8039x263
CONDITION
MIN
1.0 1.2
TYP MAX UNITS
5.5 5.5 5.5 5 9 8 4.722 4.467 4.08 3.141 2.988 2.682 V V A
V CC<5.5V, SS8039x463/438/400 V CC<3.6V, SS8039x308/293/263 T = +25C A T = +25C A T = +25C A T = +25C A T = +25C A T = +25C A 4.537 4.292 3.92 3.018 2.871 2.577
4.63 4.38 4.00 3.08 2.93 2.63
Reset Threshold
VTH
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Electrical Characteristics (Continued)
(VCC = full range, TA = -40C to +105C, unless otherwise noted. Typical values are at TA = +25C, VCC = 5V for 463/438/400 versions, V CC= 3.3V for 308/293 versions, and VCC = 3V for 263 version.) (Note 1) PARAMETER
Reset Threshold Tempco V CC to Reset Delay (Note 2) Reset Active Timeout Period
SYMBOL
CONDITION
V CC = V T H to (VT H - 100mV) V CC = V T H max, SS8039x463/438/400 V CC = V T H max, SS8039x308/293/263
MIN
TYP MAX
70 15
UNITS
ppm/C
250 140
510 310 10 100
720 520
ms s ns s V K mA
MR Minimum Pulse Width MR Glitch Immunity (Note 3) MR to Reset Propagation Delay
(Note 2)
tMR
tMD V IH V IL V CC > V TH(max) 0.6 x VCC
0.5
MR Input Threshold MR Pull-up Resistance
RESET Output Current Low (push-pull active low ,SS8039L
0.25 x VCC 10 20 30
IOL
V CC = 2.5V, V RESET = 0.5V V CC = 5V, V RESET = 4.5V, SS8039L463/438/400
8 4.5 3 2 16 12 10 2
RESET Output Current High (push-pull active low , SS8039L)
RESET Output Current Low (push-pull active high, SS8039H) RESET Output Current High (push-pull active high, SS8039H)
IOH
V CC = 3.3V, V RESET = 2.8V, SS8039L308/293 V CC = 3V, V RESET = 2.5V, SS8039L263 V CC = 5V, V RESET = 0.5V, SS8039H463/438/400 V CC = 3.3V, V RESET = 0.5V, SS8039H308/293 V CC = 3V, V RESET = 0.5V, SS8039H263 V CC = 2.5V, V RESET = 2V
mA
IOL
mA
IOH
mA
Note 1: Production testing done at TA = +25C; limits over temperature guaranteed by design. Note 2: RESET output is for SS8039L; RESET output is for SS8039H. Note 3: "Glitches" of 100ns or less typically will not generate a reset pulse.
Selection Guide and Part Marking
PART/SUFFIX
SS8039H463TC SS8039H438TC SS8039H400TC SS8039H308TC SS8039H293TC SS8039H263TC SS8039L463TC SS8039L438TC SS8039L400TC SS8039L308TC SS8039L293TC SS8039L263TC
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
OUTPUT TYPE
Push-Pull Push-Pull Push-Pull Push-Pull Push-Pull Push-Pull RESET RESET RESET RESET RESET RESET
TOP MARK
692Lx 692Kx 692Jx 692Ix 692Hx 692Gx 692Fx 692Ex 692Dx 692Cx 692Bx 692A x
Push-Pull RESET Push-Pull RESET Push-Pull RESET Push-Pull RESET Push-Pull RESET Push-Pull RESET
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SS8039
Typical Operating 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 80 70
Supply Current (A) Power-down Reset Delay (s)
Power-down Reset Delay vs. Temperature (SS8039x308/293/263)
15
SS8039x463/438/400, VCC =5V
VOD=20mV
60 50 40 30 20 10 VOD=125mV VOD=200mV 0 VO D=VT H-V CC
10
SS8039x308/293/263, VCC =3.3V SS8039x463/438/400/308/293/263, VCC=1V
5
0 -40 -20 0 20 40 Temperature (C) 60 80
-40
-20
0
20 40 60 Temperature(C)
80
Power-up Reset Timeout vs. Temperature
330
Power-up Reset Timeout (ms)
Normalized Reset Threshold vs. Temperature
1.006 1.004
Normalized Threshold
325 320 315 310 305 -40 -20 0 20 40 60 80 Temperature (C) SS8039x308/293/263
1.002 1 0.998 0.996 0.994 0.992 0.99 0.988 0.986
-40 -20 0 20 40 60 80 Temperature(C)
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SS8039
Pin Description
PIN
1
NAME
GND
RESET (SS8039L) RESET (SS8039H)
FUNCTION
Ground
RESET Output remains low while V CC is below the reset threshold, and for at least 140ms after VCC rises above the reset threshold. RESET Output remains high while V CC is below the reset threshold, and for at least 140ms after VCC rises above the reset threshold.
2
Manual Reset Input. A logic low on MR asserts reset. Reset remains asserted as long as MR is 3
MR
4
V CC
low and for at least 140ms after MR returns high, This active-low input has an internal 20k pull- up resistor. It can be driven from a TTL or CMOS-logic line, or shorted to ground with a switch. Leave open if unused. Supply Voltage (+5V, +3.3V, +3.0V)
600
Detailed Description
A microprocessor's (P's) reset input starts the P in a known state. The SS8039L and SS8039H 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 SS8039L/ SS8039H have a push-pull output stage. The manual reset input (MR) can also initiate a reset. See the Manual Reset Input Section.
500
Maximun Transient Duration (u s )
400
300
200
100
0
1 10 100 1000
Reset Comparator Overdrive, V TH-V CC (mV)
Manual Reset Input Many P-based products require manual reset capability allowing the operator, a test technician, or external logic circuitry to initiate a reset. A logic low on MR asserts reset. Reset remains asserted while MR is low, and for the Reset Active Timeout Period (t RP) after MR returns high. This input has an internal 20k pull-up resistor, so it can be left open if it is not used. MR can be driven with TTL or CMOS-logic levels, or with open-drain / collector outputs. Connect a normally open momentary switch from MR to GND to create a manual-reset function; external debounce circuitry is not required. If MR is driven from long cables or if the device is used in a noisy environment, connecting a 0.1F capacitor from
MR to ground provides additional noise immunity.
Fig.1 Maximum Transient Duration Without Causing a Reset Pulse vs. Reset Comparator Overdrive
VCC
SS8039
RESET
GND
R1 100k
Figure2. RESET Valid to VCC = Ground Circuit
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SS8039
Applications Information
Negative-Going VCC Transients In addition to issuing a reset to the P during power-up, power-down, and brownout conditions, the SS8039H and SS8039L are relatively immune to short-duration negative-going VCC transients (glitches). Figure1 shows typical transient durations, vs. the reset comparator overdrive, for which both the SS8039H and SS8039L 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. For the SS8039x463 and SS8039x438, a VCC transient that goes 100mV below the reset threshold and lasts 15s or less will not typically 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 SS8039 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. 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 SS8039x uses 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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SS8039
Physical Dimensions
D e1 L C
E E1
e2
bx3
Package Orientation
A2
A
A1 b1
Feed Direction
SOT 143 Package
SYMBOL
A A1 A2 b b1 C D E E1 e1 e2 L
DIMENSION IN MILIMETERS MIN. MAX.
0.95 0.05 0.90 0.37 0.76 0.10 2.80 1.20 2.30 1.92 BSC. 0.20 BSC. 0.69 REF. 1.20 0.10 1.10 0.46 0.89 0.18 3.04 1.40 2.50
MIN.
0.037 0.002 0.035 0.145 0.030 0.004 0.110 0.047 0.091
DIMENSION IN INCHS MAX.
0.047 0.004 0.043 0.018 0.035 0.007 0.120 0.055 0.098 0.75 BSC. 0.078 BSC. 0.27 REF.
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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