TS831 MICROPOWER VOLTAGE SUPERVISOR RESET ACTIVE LOW n ULTRA LOW POWER CONSUMPTION : 12m A maximum n PRECISION RESET THRESHOLD n THRESHOLD VOLTAGE: 4.33V typ. FOR TS831-5 4.50V typ. FOR TS831-4 2.71V typ. FOR TS831-3 n GUARANTEED RESET OPERATION FOR VCC DOWN TO 1V n OPEN DRAIN OUTPUT COMPARATOR n FAST RESPONSE TIME : 20m s FOR A 10mV D Z SO8 TO92 OVERDRIVE n (Plastic Micropackage) (Plastic Package) INTERNAL BUILT-IN HYSTERESIS n 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 P output. TSSOP8 The threshold voltage is set at 4.33V for TS831-5, (Thin Shrink Small Outline Package) 4.5V for TS831-4 and 2.71V for TS831-3 by internal thermally matched resistors. The comparator exhibits a 20m s response (with PIN CONNECTIONS (top view) 10mV overdrive) and has an open drain output active when input voltage is lower than the threshold. An internal hysteresis, 100mV for SO8-TSSOP8 TS831-4 / TS831-5 and 60mV for TS831-3, increases the comparator’s noise margin and prevents false reset operation. APPLICATION n Power-on reset generator for microcontroller n Power failure detector ORDER CODE TO92 Package Part Number Temperature Range D Z P TS831-5I • • • TS831-4I -40, +125°C • • • TS831-3I • • • 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) November 2001 1/11

TS831 ABSOLUTE MAXIMUM RATINGS Symbol Parameter Value Unit VCC Supply Voltage 1) 7 V VOUT Output Voltage -0.3 to Vcc + 0.3 V Output Sink Current TS831-5 and TS831-4 20 I mA OUT TS831-3 5 PD Power Dissipation 2) TO92 625 SO8 700 mW TSSOP8 625 IF Clamp Diode Forward Current, pin 1 to pin 2 3) 100 mA T Storage Temperature -65 to +150 °C STG 1. All voltages values, except differential voltage are with respect to network ground terminal. 2. Tj = 150°C, Tamb = 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 V Supply Voltage 1 to 5.5 V CC TOPER Operating Free Air Temperature Range -40 to +125 °C TS831-5 ELECTRICAL CHARACTERISTICS Tamb = 25°C (unless otherwise specified) Symbol Parameter Min. Typ. Max. Unit Threshold Voltage with V Increasing 4.33 CC V -40°C £ Tamb £ +85°C 4.11 4.46 V THI -40°C £ Tamb £ +125°C 4.11 4.50 Threshold Voltage with V Decreasing 4.21 CC VTHD -40°C £ Tamb £ +85°C 4.10 4.46 V -40°C £ Tamb £ +125°C 4.06 4.46 V Hysteresis Voltage 50 100 200 mV HYS I Current Consumption V = 5V 12 m A CC CC Low Level Output Voltage V = 4V, I = 8mA 450 800 CC OL VOL -40°C £ Tamb £ +85°C 1000 mV -40°C £ Tamb £ +125°C 1300 High Level Output Current V = 5V 2 100 I CC nA OH -40°C £ Tamb £ +125°C 1000 Response Time High to Low TPHL R = 10kW , C = 15pF, V = V -10mV 20 m s L L CC THD Note : Limits are 100% production tested at 25°C. Limits over temperature are guaranteed through correlation and by design. 2/11

TS831 TS831-4 ELECTRICAL CHARACTERISTICS Tamb = 25°C (unless otherwise specified) Symbol Parameter Min. Typ. Max. Unit Threshold Voltage with V Increasing 4.50 CC V -40°C £ Tamb £ +85°C 4.18 4.66 V THI -40°C £ Tamb £ +125°C 4.18 4.70 Threshold Voltage with V Decreasing 4.40 CC V -40°C £ Tamb £ +85°C 4.17 4.66 V THD -40°C £ Tamb £ +125°C 4.13 4.66 V Hysteresis Voltage 50 100 200 mV HYS I Current Consumption V = 5V 12 m A CC CC Low Level Output Voltage V = 4V, I = 8mA 450 800 CC OL V -40°C £ Tamb £ +85°C 1000 mV OL -40°C £ Tamb £ +125°C 1300 High Level Output Current V = 5V 2 100 I CC nA OH -40°C £ Tamb £ +125°C 1000 Response Time High to Low TPHL R = 10kW , C = 15pF, V = V -10mV 20 m s L L CC THD 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 Parameter Min. Typ. Max. Unit Threshold Voltage with V Increasing 2.71 V CC V THI -40°C £ Tamb £ +125°C 2.55 2.8 Threshold Voltage with V Decreasing 2.65 V CC V THD -40°C £ Tamb £ +125°C 2.55 2.8 V Hysteresis Voltage 30 60 100 mV HYS I Current Consumption V = 3V 12 m A CC CC Low Level Output Voltage V = 2.4V, I = 1mA 140 400 V CC OL mV OL -40°C £ Tamb £ +125°C 500 High Level Output Current V = 3V 2 100 I CC nA OH -40°C £ Tamb £ +125°C 1000 Response Time High to Low TPHL R = 10kW , C = 15pF, V = V -10mV 20 m s L L CC THD 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

TS831 Output voltageversus Vcc Reset output voltage versus Vcc 5 5 TS831- 3 TS831- 3 e (V) 4 RT=L2 =5 °1C0 kW e (V) 4 RT=L2 =5 °1C0 kW g g olta 3 olta 3 V V ut ut utp 2 utp 2 O O 1 1 0 0 0 1 2 3 4 5 2.600 2.625 2.650 2.675 2.700 2.725 2.750 Vcc (V) Vcc (V) Output voltageversus Vcc Reset output voltage versus Vcc 5 5 TS831- 4 4 RL = 10 kW 4 V) T=25°C V) e ( e ( g g TS831- 4 olta 3 olta 3 RL = 10 kW ut V ut V T=25°C utp 2 utp 2 O O 1 1 0 0 0 1 2 3 4 5 4.40 4.45 4.50 4.55 4.60 Vcc (V) Vcc (V) Output voltageversus Vcc Reset output voltage versus Vcc 5 5 TS831- 5 V) 4 RL = 10 kW V) 4 e ( T=25°C e ( g g TS831- 5 olta 3 olta 3 RL = 10 kW V V T=25°C ut ut utp 2 utp 2 O O 1 1 0 0 0 1 2 3 4 5 4.20 4.25 4.30 4.35 4.40 Vcc (V) Vcc (V) 5/11

TS831 V versus temperature V versus temperature THI THD 4.60 4.44 TS831- 4 VTHD max TS831-4 4.42 4.55 V (V)THI 4.50 VTH Imax V (V)THD 44..3480 4.45 VTH Imin 4.36 VTHD min 4.34 4.40 4.32 -40 -20 0 20 40 60 80 100 120 -40 -20 0 20 40 60 80 100 120 Temperature (°C) Temperature (°C) Hysteresis voltage versus temperature Supply current versus temperature 160 10.0 140 TS831- 4 A) 9.5 Icc max mV) No load nt (µ sis ( 120 urre Icc min ere y c 9.0 yst 100 ppl H u S TS831- 4 8.5 Vcc=5V 80 No load 60 8.0 -40 -20 0 20 40 60 80 100 120 -40 -20 0 20 40 60 80 100 120 Temperature (°C) Temperature (°C) Supply current vs Vcc & temperature Voltage output low vs Isink & temperature 12 TS831- 3 10 TS831- 3 2.0 Input voltage=2.4 V A) No load µ nt ( 8 1.5 +125°C e ply curr 6 +125°C V (V)OL 1.0 +25°C+85°C p -40°C Su 4 - 40°C +25°C 0.5 2 0 0.0 0 1 2 3 4 5 0 1 2 3 4 5 Vcc (V) I (mA) SINK 6/11

TS831 Supply current vs Vcc & temperature Voltage output low vs Isink & temperature 10 4 TS831- 4 TS831- 4 No load Vcc= 4 V µA) 8 +125°C+85°C 3 nt ( +125°C Supply curre 46 - 40°C +25°C V (V)OL 2 - 40°C +25°+C85°C 1 2 0 0 0 1 2 3 4 5 0 5 10 15 20 Vcc (V) I (mA) SINK Supply current vs Vcc & temperature Voltage output low vs Isink & temperature 10 4 TS831- 5 TS831- 5 No load +125°C Vcc=4 V +125°C A) 8 +85°C 3 µ pply current ( 46 V (V)OL 2 - 40°C +25°C+85°C u S - 40°C +25°C 1 2 0 0 0 1 2 3 4 5 0 5 10 15 20 Vcc (V) I (mA) SINK Clamp diode forward current versus voltage Response time 100 5 V 4 V Vcc=0 V A) 80 T=25°C m nt ( 5 V Reset output Vcc e urr 60 4 V c d ar TS831- 4 Forw 40 Response time RT=L2 =5 °1C0 kW 20 0 V 0 0.0 0.5 1.0 1.5 0 20 40 60 80 Forward voltage (V) Time (µs) 7/11

TS831 Basic configuration in Pull up resistor Microprocessor Power TS831 Reset circuit Supply d n G Special remarks * Some microprocessor may integrate the pull up resistor. * For the pull up resistor choice, please use the graphs nammed "Voltage output low vs Isink & temperature" depending on TS831 versions. 8/11

TS831 PACKAGE MECHANICAL DATA 8 PINS - PLASTIC MICROPACKAGE (SO) Millimeters Inches Dim. Min. Typ. Max. Min. Typ. Max. A 1.75 0.069 a1 0.1 0.25 0.004 0.010 a2 1.65 0.065 a3 0.65 0.85 0.026 0.033 b 0.35 0.48 0.014 0.019 b1 0.19 0.25 0.007 0.010 C 0.25 0.5 0.010 0.020 c1 45° (typ.) D 4.8 5.0 0.189 0.197 E 5.8 6.2 0.228 0.244 e 1.27 0.050 e3 3.81 0.150 F 3.8 4.0 0.150 0.157 L 0.4 1.27 0.016 0.050 M 0.6 0.024 S 8° (max.) 9/11

TS831 PACKAGE MECHANICAL DATA 3 PINS - PLASTIC PACKAGE TO92 Millimeters Inches Dim. Min Typ. Max. Min. Typ. Max. L 1.27 0.05 B 3.2 3.7 4.2 0.126 0.1457 0.1654 O1 4.45 5.00 5.2 0.1752 0.1969 0.2047 C 4.58 5.03 5.33 0.1803 0.198 0.2098 K 12.7 0.5 O2 0.407 0.5 0.508 0.016 0.0197 0.02 a 0.35 0.0138 10/11

TS831 PACKAGE MECHANICAL DATA 8 PINS - THIN SHRINK SMALL OUTLINE PACKAGE k c 0,25mm .010inch GAGEPLANE L L1 E1 SEATINGPLANE C A E A2 A1 5 4 D b C e aaa 8 1 PIN1IDENTIFICATION Millimeters Inches Dim. Min. Typ. Max. Min. Typ. Max. A 1.20 0.05 A1 0.05 0.15 0.01 0.006 A2 0.80 1.00 1.05 0.031 0.039 0.041 b 0.19 0.30 0.007 0.15 c 0.09 0.20 0.003 0.012 D 2.90 3.00 3.10 0.114 0.118 0.122 E 6.40 0.252 E1 4.30 4.40 4.50 0.169 0.173 0.177 e 0.65 0.025 k 0° 8° 0° 8° l 0.50 0.60 0.75 0.09 0.0236 0.030 Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. © The ST logo is a registered trademark of STMicroelectronics © 2001 STMicroelectronics - Printed in Italy - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - China - Finland - France - Germany - Hong Kong - India - Italy - Japan - Malaysia - Malta - Morocco Singapore - Spain - Sweden - Switzerland - United Kingdom © http://www.st.com 11/11