STM1001T

STM1001 Reset Circuit FEATURES SUMMARY ■ ■ ■ ■ ■ ■ ■ PRECISION MONITORING OF 3V, 3.3V, and 5V SUPPLY VOLTAGES OPEN DRAIN RST OUTPUT 140ms RESET PULSE WIDTH (MIN) LOW SUPPLY CURRENT - 6µA (TYP) GUARANTEED RST ASSERTION DOWN TO VCC = 1.0V OPERATING TEMPERATURE: –40°C to 85°C (Industrial Grade) LEAD-FREE, SMALL SOT23 PACKAGE Figure 2. Package SOT23-3 (WX) Figure 1. Logic Diagram VCC Table 1. Signal Names VSS RST VCC Ground Active-Low RESET Output (Open Drain) Supply Voltage STM1001 RST Figure 3. SOT23-3 Connections RST VCC 1 2 3 VSS AI09117 VSS AI09116 November 2004 1/13 STM1001 TABLE OF CONTENTS FEATURES SUMMARY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Figure 1. Figure 2. Table 1. Figure 3. Logic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Package. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Signal Names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 SOT23-3 Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 SUMMARY DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Figure 4. Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Figure 5. Hardware Hookup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Reset Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Negative-Going VCC Transients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Valid /RST Output Down to VCC = 0V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 TYPICAL OPERATING CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Figure 6. Supply Current vs. Temperature, L/M/R/S/T (no load) . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Figure 7. Power-down Reset Delay vs. Temperature - VOD = VTH – VCC (L/M). . . . . . . . . . . . . . . . 5 Figure 8. Power-down Reset Delay vs. Temperature - VOD = VTH – VCC (R/S/T) . . . . . . . . . . . . . . 6 Figure 9. Power-up trec vs. Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Figure 10.Normalized Reset Threshold vs. Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Figure 11.Max Transient Duration NOT Causing Reset Pulse vs. Reset Comparator Overdrive . . . 7 MAXIMUM RATING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Table 2. Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 DC and AC PARAMETERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Table 3. Operating and AC Measurement Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Figure 12.AC Testing Input/Output Waveforms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Table 4. DC and AC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 PACKAGE MECHANICAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Figure 13.SOT23-3 – 3-lead Small Outline Transistor Package Outline . . . . . . . . . . . . . . . . . . . . . 10 Table 5. SOT23-3 – 3-lead Small Outline Transistor Package Mechanical Data . . . . . . . . . . . . . 10 PART NUMBERING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Table 6. Ordering Information Scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Table 7. Marking Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 REVISION HISTORY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Table 8. Document Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 2/13 STM1001 SUMMARY DESCRIPTION The STM1001 MICROPROCESSOR RESET Circuit is a low-power supervisory device used to monitor power supplies. It performs a single function: asserting a reset signal whenever the VCC Figure 4. Block Diagram VCC VRST COMPARE trec Generator AI09118 supply voltage drops below a preset value and keeping it asserted until VCC has risen above the preset threshold for a minimum period of time (trec). RST(1) Note: 1. Open Drain Figure 5. Hardware Hookup VCC VCC STM1001 RST VSS (1) (1) VCC MCU RESET Input VSS AI09119 Note: 1. RST output requires pull-up resistor. 3/13 STM1001 OPERATION Reset Output The STM1001 MICROPROCESSOR RESET CIRCUIT asserts a reset signal to the MCU whenever VCC goes below the reset threshold (VRST). RST is guaranteed valid down to VCC = 1V (0° to 70°C). During power-up, once VCC exceeds the reset threshold an internal timer keeps RST low for the reset time-out period, trec. After this interval, RST returns high. If VCC drops below the reset threshold, RST goes low. Each time RST is asserted, it stays low for at least the reset time-out period. Any time VCC goes below the reset threshold, the internal timer clears. The reset timer starts when VCC returns above the reset threshold. The active-low reset (RST) is an open drain output. Negative-Going VCC Transients The STM1001 is relatively immune to negative-going VCC transients (glitches). Figure 11., page 7 shows typical transient duration versus reset comparator overdrive (for which the STM1001 will NOT generate a reset pulse). The graph was generated using a negative pulse applied to VCC, starting at 0.5V above the actual reset threshold and ending below it by the magnitude indicated (comparator overdrive). The graph indicates the maximum pulse width a negative VCC transient can have without causing a reset pulse. As the magnitude of the transient increases (further below the threshold), the maximum allowable pulse width decreases. Any combination of duration and overdrive which lies under the curve will NOT generate a reset signal. Typically, a VCC transient that goes 100mV below the reset threshold and lasts 20µs 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. Valid /RST Output Down to VCC = 0V When VCC falls below 1V, the RST output no longer sinks current, but becomes an open circuit. In most systems this is not a problem, as most MCUs do not operate below 1V. However, in applications where RST output must be valid down to 0V, a pull-down resistor may be added to hold the RST output low. This resistor must be large enough to not load the RST output, and still be small enough to pull the output to ground. A 100KΩ resistor is recommended. 4/13 STM1001 TYPICAL OPERATING CHARACTERISTICS Note: Typical values are at TA = 25°C, VCC = 5V for L/M versions, VCC = 3.3V for T/S versions, and VCC = 3.0V for R versions. Figure 6. Supply Current vs. Temperature, L/M/R/S/T (no load) 8.0 6.0 Supply Current (µA) 4.0 1V 3V 3.6V 5.5V 2.0 0.0 –40 –20 0 20 Temperature (˚C) 40 60 80 AI07879 Figure 7. Power-down Reset Delay vs. Temperature - VOD = VTH – VCC (L/M) 140.00 120.00 100.00 80.00 60.00 40.00 20.00 0.00 –40 VOD = 20mV VOD = 125mV VOD = 200mV Power-Down Reset Delay (µs) –20 0 20 Temperature (˚C) 40 60 80 AI07880 5/13 STM1001 Figure 8. Power-down Reset Delay vs. Temperature - VOD = VTH – VCC (R/S/T) 100.00 Power-Down Reset Delay (µs) 80.00 60.00 VOD = 20mV VOD = 125mV VOD = 200mV 40.00 20.00 0.00 –40 –20 0 20 Temperature (˚C) 40 60 80 AI07878 Figure 9. Power-up trec vs. Temperature 250.00 240.00 Power-up trec (ms) 230.00 L/M R/S/T 220.00 210.00 200.00 –40 –20 0 20 Temperature (˚C) 40 60 80 AI07881 6/13 STM1001 Figure 10. Normalized Reset Threshold vs. Temperature 1.003 1.002 1.001 1.000 Normalized Treshold 0.999 0.998 0.997 0.996 0.995 0.994 0.993 –40 –20 0 20 Temperature (˚C) AI07882 L/M R/S/T 40 60 80 Figure 11. Max Transient Duration NOT Causing Reset Pulse vs. Reset Comparator Overdrive 700.00 600.00 Maximum Transient Duration (µs) 500.00 400.00 R/S/T L/M 300.00 200.00 100.00 0.00 1 10 100 1000 AI07883 Reset Comparator Overdrive, VRST – VCC (mV) 7/13 STM1001 MAXIMUM RATING Stressing the device above the rating listed in the Absolute Maximum Ratings” table may cause permanent damage to the device. These are stress ratings only and operation of the device at these or any other conditions above those indicated in the Operating sections of this specification is not imTable 2. Absolute Maximum Ratings Symbol TSTG TSLD(1) VIO VCC IO PD Parameter Storage Temperature (VCC Off) Lead Solder Temperature for 10 seconds Input or Output Voltage Supply Voltage Output Current Power Dissipation Value –55 to 150 260 –0.3 to VCC +0.3 –0.3 to 7.0 20 320 Unit °C °C V V mA mW plied. Exposure to Absolute Maximum Rating conditions for extended periods may affect device reliability. Refer also to the STMicroelectronics SURE Program and other relevant quality documents. Note: 1. Reflow at peak temperature of 255°C to 260°C for < 30 seconds (total thermal budget not to exceed 180°C for between 90 to 150 seconds). DC AND AC PARAMETERS This section summarizes the operating measurement conditions, and the DC and AC characteristics of the device. The parameters in the DC and AC characteristics Tables that follow, are derived from tests performed under the Measurement Conditions summarized in Table 3, Operating and AC Measurement Conditions. Designers should check that the operating conditions in their circuit match the operating conditions when relying on the quoted parameters. Table 3. Operating and AC Measurement Conditions Parameter VCC Supply Voltage Ambient Operating Temperature (TA) Input Rise and Fall Times Input Pulse Voltages Input and Output Timing Ref. Voltages STM1001 1.0 to 5.5 –40 to 85 ≤5 0.2 to 0.8VCC 0.3 to 0.7VCC Unit V °C ns V V Figure 12. AC Testing Input/Output Waveforms 0.8VCC 0.7VCC 0.3VCC AI02568 0.2VCC 8/13 STM1001 Table 4. DC and AC Characteristics Sym Alternative Description Test Condition(1) TA = –40 to +85°C Operating Voltage TA = 0 to +70°C VCC Supply Current Open Drain Reset Output Leakage Current VCC < 3.6V VCC < 5.5V ILO VCC > VRST, Reset not asserted STM1001R/S/T only, IOL = 1.2mA VCC = VRST (min) RST Output Low Voltage STM1001L/M only, IOL = 3.2mA VCC = VRST (min) RST Output Low Voltage IOL = 50µA; VCC > 1.0V 0.4 0.3 V V –1 1.0 5.5 7 5.5 10 15 +1 0.3 V µA µA µA V Min 1.2 Typ Max 5.5 Unit V VCC ICC VOL VOL RESET Thresholds 25°C STM1001L –40 to 85°C 25°C STM1001M –40 to 85°C 25°C VRST Reset Threshold STM1001T –40 to 85°C 25°C STM1001S –40 to 85°C 25°C STM1001R –40 to 85°C VRST Temperature Coefficient VCC to RST Delay trec RST Pulse Width VCC = 3.3V VCC = VRST to (VRST – 100mV) STM1001L/M STM1001R/S/T 140 2.55 45 40 20 210 280 2.70 V ppm/ C µs µs ms 2.85 2.59 2.63 3.00 2.66 V V 3.00 2.89 2.93 3.15 2.96 V V 4.25 3.04 3.08 4.50 3.11 V V 4.50 4.31 4.38 4.75 4.45 V V 4.56 4.63 4.70 V Note: 1. Valid for Ambient Operating Temperature: TA = –40 to 85°C; VCC = 1.2V to 5.5V (except where noted). 2. “Glitches” of 100ns or less typically will not generate a RESET pulse. 9/13 STM1001 PACKAGE MECHANICAL Figure 13. SOT23-3 – 3-lead Small Outline Transistor Package Outline E E1 B 0.15 M CAB A1 1 e e1 D 0.20 M CAB A 3X 0.10 C C A2 A 3X b C θ L1 L SOT23-3 C Note: Drawing is not to scale. Table 5. SOT23-3 – 3-lead Small Outline Transistor Package Mechanical Data mm Symbol Typ A A1 A2 b C D E E1 e e1 L L1 Θ N 0.54 0.40 0° 3 0.60 8° Min 0.89 0.01 0.88 0.30 0.08 2.80 2.10 1.20 0.89 1.78 Max 1.12 0.10 1.02 0.50 0.20 3.04 2.64 1.40 1.03 2.05 0.021 0.016 0° 3 0.024 8° Typ Min 0.035 0.001 0.035 0.012 0.003 0.110 0.083 0.047 0.035 0.070 Max 0.044 0.004 0.042 0.020 0.008 0.120 0.104 0.055 0.041 0.081 inches 10/13 STM1001 PART NUMBERING Table 6. Ordering Information Scheme Example: STM1001 L WX 6 F Device Type STM1001 Reset Threshold Voltage L = VRST = 4.50V to 4.75V M = VRST = 4.25V to 4.50V T = VRST = 3.00V to 3.15V S = VRST = 2.85V to 3.00V R = VRST = 2.55V to 2.70V Package WX = SOT23-3 Temperature Range 6 = –40 to 85°C Shipping Method F = Pb-Free Package (ECO PACK®), Tape & Reel For other options, or for more information on any aspect of this device, please contact the ST Sales Office nearest you. Table 7. Marking Description Part Number STM1001L STM1001M STM1001T STM1001S STM1001R Note: 1. Lowercase “x” indicates date code. Reset Threshold 4.63V 4.38V 3.08V 2.93V 2.63V Output Open Drain RST Open Drain RST Open Drain RST Open Drain RST Open Drain RST Topside Marking(1) 8BAx 8BBx 8BCx 8BDx 8BEx 11/13 STM1001 REVISION HISTORY Table 8. Document Revision History Date 09-Dec-03 19-Feb-04 22-Mar-04 09-Apr-04 19-Nov-04 Version 1.0 2.0 2.1 3.0 4.0 First Edition Part number changed from STM6301 Update DC Characteristics (Table 4) Device promoted; reformatted; marking updated (Table 7) Update dimensions (Table 5) Revision Details 12/13 STM1001 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. All other names are the property of their respective owners © 2004 STMicroelectronics - All rights reserved STMicroelectronics group of companies Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America www.st.com 13/13