ST TS831 User Manual
TS831
MICROPOWER VOLTAGE SUPERVISOR RESET ACTIVE LOW
■ULTRA LOW POWER CONSUMPTION : 12μA maximum
■PRECISION RESET THRESHOLD
■THRESHOLD VOLTAGE: 4.33V typ. FOR TS831-5 4.50V typ. FOR TS831-4 2.71V typ. FOR TS831-3
■GUARANTEED RESET OPERATION FOR VCC DOWN TO 1V
■OPEN DRAIN OUTPUT COMPARATOR
■FAST RESPONSE TIME : 20μs FOR A 10mV OVERDRIVE
■INTERNAL BUILT-IN HYSTERESIS
■PIN TO PIN COMPATIBLE WITH MC33064 AND MC33164
DESCRIPTION
The TS831 is an ultra low power integrated circuit incorporating a high stability band-gap voltage reference and a comparator with an open drain output.
The threshold voltage is set at 4.33V for TS831-5, 4.5V for TS831-4 and 2.71V for TS831-3 by internal thermally matched resistors.
The comparator exhibits a 20μs response (with 10mV overdrive) and has an open drain output active when input voltage is lower than the threshold. An internal hysteresis, 100mV for TS831-4 / TS831-5 and 60mV for TS831-3, increases the comparator’s noise margin and prevents false reset operation.
APPLICATION
■Power-on reset generator for microcontroller
■Power failure detector
ORDER CODE
Part Number |
Temperature Range |
Package |
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D |
Z |
P |
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TS831-5I |
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∙ |
∙ |
∙ |
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TS831-4I |
-40, +125°C |
∙ |
∙ |
∙ |
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TS831-3I |
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∙ |
∙ |
∙ |
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Z= TO92 Plastic package
D = Small Outline Package (SO) - also available in Tape & Reel (DT) P = Thin Shrink Small Outline Package (TSSOP) - only available
in Tape & Reel (PT)
D |
Z |
SO8 |
TO92 |
(Plastic Micropackage) |
(Plastic Package) |
P
TSSOP8
(Thin Shrink Small Outline Package)
PIN CONNECTIONS (top view)
SO8-TSSOP8
TO92
November 2001 |
1/11 |
TS831
ABSOLUTE MAXIMUM RATINGS
Symbol |
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Parameter |
Value |
Unit |
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VCC |
Supply Voltage 1) |
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7 |
V |
VOUT |
Output Voltage |
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-0.3 to Vcc + 0.3 |
V |
IOUT |
Output Sink Current |
TS831-5 and TS831-4 |
20 |
mA |
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TS831-3 |
5 |
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PD |
Power Dissipation 2) |
TO92 |
625 |
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SO8 |
700 |
mW |
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TSSOP8 |
625 |
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IF |
Clamp Diode Forward Current, pin 1 to pin 2 3) |
100 |
mA |
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TSTG |
Storage Temperature |
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-65 to +150 |
°C |
1.All voltages values, except differential voltage are with respect to network ground terminal.
2.Tj = 150°C, T amb = 25oC with Rthja = 200oC/W for TO-92 package
Rthja = 175oC/W for SO8 package Rthja = 200oC/W for TSSOP8 package
3. Maximum package power dissipation limits must be observed.
OPERATING CONDITIONS
Symbol |
Parameter |
Value |
Unit |
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VCC |
Supply Voltage |
1 to 5.5 |
V |
TOPER |
Operating Free Air Temperature Range |
-40 to +125 |
°C |
TS831-5
ELECTRICAL CHARACTERISTICS Tamb = 25°C (unless otherwise specified)
Symbol |
Parameter |
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Min. |
Typ. |
Max. |
Unit |
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VTHI |
Threshold Voltage with VCC Increasing |
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4.33 |
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-40°C ≤ Tamb ≤ +85°C |
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4.11 |
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4.46 |
V |
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-40°C ≤ Tamb ≤ +125°C |
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4.11 |
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4.50 |
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VTHD |
Threshold Voltage with VCC Decreasing |
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4.21 |
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-40°C ≤ Tamb ≤ +85°C |
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4.10 |
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4.46 |
V |
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-40°C ≤ Tamb ≤ +125°C |
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4.06 |
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4.46 |
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VHYS |
Hysteresis Voltage |
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50 |
100 |
200 |
mV |
ICC |
Current Consumption |
VCC = 5V |
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12 |
μA |
VOL |
Low Level Output Voltage |
VCC = 4V, IOL = 8mA |
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450 |
800 |
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-40°C ≤ Tamb ≤ +85°C |
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1000 |
mV |
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-40°C ≤ Tamb ≤ +125°C |
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1300 |
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IOH |
High Level Output Current |
VCC = 5V |
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2 |
100 |
nA |
-40°C ≤ Tamb ≤ +125°C |
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1000 |
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TPHL |
Response Time High to Low |
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20 |
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μs |
RL = 10kΩ, CL = 15pF, VCC = VTHD |
-10mV |
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Note : Limits are 100% production tested at 25°C. Limits over temperature are guaranteed through correlation and by design.
2/11
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TS831 |
TS831-4 |
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ELECTRICAL CHARACTERISTICS Tamb = 25°C (unless otherwise specified) |
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Symbol |
Parameter |
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Min. |
Typ. |
Max. |
Unit |
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VTHI |
Threshold Voltage with VCC Increasing |
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4.50 |
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-40°C ≤ Tamb ≤ +85°C |
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4.18 |
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4.66 |
V |
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-40°C ≤ Tamb ≤ +125°C |
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4.18 |
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4.70 |
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VTHD |
Threshold Voltage with VCC Decreasing |
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4.40 |
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-40°C ≤ Tamb ≤ +85°C |
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4.17 |
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4.66 |
V |
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-40°C ≤ Tamb ≤ +125°C |
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4.13 |
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4.66 |
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VHYS |
Hysteresis Voltage |
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50 |
100 |
200 |
mV |
ICC |
Current Consumption |
VCC = 5V |
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12 |
μA |
VOL |
Low Level Output Voltage |
VCC = 4V, IOL = 8mA |
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450 |
800 |
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-40°C ≤ Tamb ≤ +85°C |
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1000 |
mV |
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-40°C ≤ Tamb ≤ +125°C |
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1300 |
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IOH |
High Level Output Current |
VCC = 5V |
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2 |
100 |
nA |
-40°C ≤ Tamb ≤ +125°C |
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1000 |
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TPHL |
Response Time High to Low |
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20 |
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μs |
RL = 10kΩ, CL = 15pF, VCC = VTHD |
-10mV |
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Note : Limits are 100% production tested at 25°C. Limits over temperature are guaranteed through correlation and by design.
TS831-3
ELECTRICAL CHARACTERISTICS Tamb = 25°C (unless otherwise specified)
Symbol |
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Parameter |
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Min. |
Typ. |
Max. |
Unit |
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VTHI |
Threshold Voltage with VCC Increasing |
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2.71 |
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V |
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-40°C |
≤ Tamb ≤ +125°C |
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2.55 |
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2.8 |
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VTHD |
Threshold Voltage with VCC Decreasing |
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2.65 |
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V |
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-40°C |
≤ Tamb ≤ +125°C |
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2.55 |
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2.8 |
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VHYS |
Hysteresis Voltage |
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30 |
60 |
100 |
mV |
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ICC |
Current Consumption |
VCC = 3V |
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12 |
μA |
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VOL |
Low Level Output Voltage |
VCC = 2.4V, IOL = 1mA |
|
140 |
400 |
mV |
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-40°C |
≤ Tamb ≤ +125°C |
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500 |
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IOH |
High Level Output Current |
VCC = 3V |
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2 |
100 |
nA |
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-40°C |
≤ Tamb ≤ +125°C |
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1000 |
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TPHL |
Response Time High to Low |
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20 |
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μs |
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RL = 10kΩ, CL = 15pF, VCC = VTHD |
-10mV |
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Note : Limits are 100% production tested at 25°C. Limits over temperature are guaranteed through correlation and by design.
3/11
TS831
EQUIVALENT SCHEMATIC DIAGRAM
INPUT (Vcc)
OUTPUT
1.2V Vref
GND
TIMING DIAGRAM
4/11
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