STM812RWX6F

STM809, STM810 STM811, STM812 Reset Circuit FEATURES SUMMARY ■ ■ ■ ■ ■ ■ ■ PRECISION MONITORING OF 3V, 3.3V, and 5V SUPPLY VOLTAGES TWO OUTPUT CONFIGURATIONS – Push-pull RST Output (STM809/811) – Push-pull RST Output (STM810/812) 140ms RESET PULSE WIDTH (MIN) LOW SUPPLY CURRENT - 6µA (TYP) GUARANTEED RST/RST ASSERTION DOWN TO VCC = 1.0V OPERATING TEMPERATURE: –40°C to 85°C (Industrial Grade) LEAD-FREE, SMALL SOT23 and SOT143 PACKAGE Figure 1. Packages SOT23-3 (WX) Table 1. Device Options ActiveLow RESET STM809 STM810 STM811 STM812 ✔ ✔ ✔ ✔ ✔ ✔ ActiveHigh RESET Manual RESET Input Package SOT23-3 SOT23-3 SOT143-4 SOT143-4 SOT143-4 (W1) November 2004 1/18 STM809/810/811/812 TABLE OF CONTENTS FEATURES SUMMARY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Table 1. Device Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Figure 1. Packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 SUMMARY DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Figure 2. Figure 3. Table 2. Figure 4. Figure 5. Figure 6. Figure 7. Logic Diagram (STM809/810) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Logic Diagram (STM811/812) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Signal Names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 SOT23-3 Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 SOT143-4 Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Hardware Hookup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Reset Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Push-Button Reset Input (STM811/812) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Negative-Going VCC Transients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Valid /RST Output Down to VCC = 0V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 TYPICAL OPERATING CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Figure 8. Supply Current vs. Temperature, L/M/R/S/T (no load) . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Figure 9. Power-down Reset Delay vs. Temperature - VOD = VTH – VCC (L/M). . . . . . . . . . . . . . . . 7 Figure 10.Power-down Reset Delay vs. Temperature - VOD = VTH – VCC (R/S/T) . . . . . . . . . . . . . . 8 Figure 11.Power-up trec vs. Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Figure 12.Normalized Reset Threshold vs. Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Figure 13.Max Transient Duration NOT Causing Reset Pulse vs. Reset Comparator Overdrive . . . 9 MAXIMUM RATING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Table 3. Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 DC and AC PARAMETERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Table 4. Operating and AC Measurement Conditions . . . . . Figure 14.AC Testing Input/Output Waveforms. . . . . . . . . . . Figure 15.MR Timing Waveform . . . . . . . . . . . . . . . . . . . . . . Table 5. DC and AC Characteristics . . . . . . . . . . . . . . . . . . ...... ...... ...... ...... ....... ....... ....... ....... ...... ...... ...... ...... ...... ...... ...... ...... . . . . 11 . . . . 11 . . . . 11 . . . . 12 PACKAGE MECHANICAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Figure 16.SOT23-3 – 3-lead Small Outline Transistor Package Outline . . . . . . . . . . . . . . . . . . . . . 13 Table 6. SOT23-3 – 3-lead Small Outline Transistor Package Mechanical Data . . . . . . . . . . . . . 13 Figure 17.SOT143-4 – 4-lead Small Outline Transistor Package Outline . . . . . . . . . . . . . . . . . . . . 14 Table 7. SOT143-4 – 4-lead Small Outline Transistor Package Mechanical Data . . . . . . . . . . . . 14 PART NUMBERING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 2/18 STM809/810/811/812 Table 8. Ordering Information Scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Table 9. Marking Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 REVISION HISTORY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Table 10. Document Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 3/18 STM809/810/811/812 SUMMARY DESCRIPTION The STM809/810/811/812 MICROPROCESSOR RESET Circuits are low-power supervisory devices used to monitor power supplies. They perform a single function: asserting a reset signal whenever the VCC 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). The STM811/812 also provide a push-button reset input (MR). Figure 2. Logic Diagram (STM809/810) VCC Table 2. Signal Names VSS RST RST(1) Ground Active-Low RESET Output Active-High RESET Output Supply Voltage Manual Reset Input STM809/810 RST (RST)(1) VCC MR(2) Note: 1. STM810/812 only 2. STM811/812 only VSS Note: 1. For STM810 AI07832 Figure 4. SOT23-3 Connections VSS RST (RST) 1 2 3 VCC Figure 3. Logic Diagram (STM811/812) VCC (For STM810) AI07833 Figure 5. SOT143-4 Connections MR STM811/812 RST (RST) (1) VSS RST (RST) 1 2 4 3 VCC MR (For STM812) VSS Note: 1. For STM812 AI07834 AI07831 Figure 6. Block Diagram VCC VRST COMPARE trec Generator MR(1) DEBOUNCE AI07835 RST(2) Note: 1. STM811/812 only 2. RST for STM810/812 4/18 STM809/810/811/812 Figure 7. Hardware Hookup VCC VCC STM809/810/ 811/812 MR(2) Push-button RESET VSS RST(1) VCC MCU RESET Input VSS AI07836 Note: 1. STM809/811 only (RST for STM810/812) 2. STM811/812 only 5/18 STM809/810/811/812 OPERATION Reset Output The STM809/810/811/812 MICROPROCESSOR RESET CIRCUIT asserts a reset signal to the MCU whenever VCC goes below the reset threshold (VRST), or when the push-button reset input (MR) is taken low (see Figure 15., page 11). RST (active high for STM810/812) 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) and active-high reset (RST) both source and sink current. Push-Button Reset Input (STM811/812) A logic low on MR asserts RST. RST remains asserted while MR is low, and for trec after it returns high. The MR input has an internal 20kΩ pull-up resistor, allowing it to be left open if not used. This input can be driven with TTL/CMOS-logic levels or with open-drain/collector outputs. Connect a normally open push-button switch from MR to GND to create a manual reset function; external debounce circuitry is not required. If the device is used in a noisy environment, connect a 0.1µF capacitor from MR to GND to provide additional noise immunity. Negative-Going VCC Transients The STM809/810/811/812 are relatively immune to negative-going VCC transients (glitches). Figure 13., page 9 shows typical transient duration versus reset comparator overdrive (for which the STM809/810/811/812 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 (STM809/811) 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. Note: The same situation applies for the activehigh RST of the STM810/812. A 100KΩ pull-up resistor to VCC should be used if RST must remain valid for VCC < 1.0V. 6/18 STM809/810/811/812 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 8. 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 9. 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 7/18 STM809/810/811/812 Figure 10. 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 11. 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 8/18 STM809/810/811/812 Figure 12. 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 13. 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) 9/18 STM809/810/811/812 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 3. 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). 10/18 STM809/810/811/812 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 4., 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 4. 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 STM809/810/811/812 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 14. AC Testing Input/Output Waveforms 0.8VCC 0.7VCC 0.3VCC AI02568 0.2VCC Figure 15. MR Timing Waveform MR tMLRL RST (1) tMLMH trec AI07837a Note: 1. RST for STM810/812 11/18 STM809/810/811/812 Table 5. DC and AC Characteristics Sym VCC ICC VIH VIL Alternative Description Operating Voltage Test Condition(1) TA = –40 to +85°C TA = 0 to +70°C VCC < 3.6V VCC < 5.5V VCC > VRST (max), STM8XXL/M VCC > VRST (max), STM8XXR/S/T VCC > VRST (max), STM8XXL/M VCC > VRST (max), STM8XXR/S/T STM8XXR/S/T only, IOL = 1.2mA VCC = VRST (min) STM8XXL/M only, IOL = 3.2mA VCC = VRST (min) IOL = 50µA; VCC > 1.0V STM8XXR/S/T only, IOH = 500µA STM8XXL/M only, IOH = 800µA IOH = 150µA, 1.8V < VCC < VRST (min) 25°C –40 to 85°C 25°C –40 to 85°C 25°C –40 to 85°C 25°C –40 to 85°C 25°C –40 to 85°C 0.8VCC 0.8VCC 0.8VCC 2.2 0.7VCC 0.8 0.25VCC 0.3 0.4 0.3 Min 1.2 1.0 5.5 7 Typ Max 5.5 5.5 10 15 Unit V V µA µA V V V V V V V V V V VCC Supply Current MR Input High Voltage MR Input Low Voltage VOL RST Output Low Voltage (Active High(2) or Low) RST Output Low Voltage RST Output High Voltage VOL VOH RST Output High Voltage RESET Thresholds STM8XXL STM8XXM VRST Reset Threshold STM8XXT STM8XXS STM8XXR VRST Temperature Coefficient VCC to RST Delay Push-Button RESET Input tMLMH tMLRL tMR tMRD MR Pulse Width MR to RST Output Delay(3) MR Glitch Immunity(4) MR Pull-up Resistance trec Note: 1. 2. 3. 4. 4.56 4.50 4.31 4.25 3.04 3.00 2.89 2.85 2.59 2.55 4.63 4.38 3.08 2.93 2.63 4.70 4.75 4.45 4.50 3.11 3.15 2.96 3.00 2.66 2.70 V V V V V V V V V V ppm/ C µs µs VCC = 3.3V VCC = VRST to (VRST – 100mV) STM8XXL/M STM8XXR/S/T 45 40 20 10 0.5 100 10 140 20 210 30 280 µs µs ns kΩ ms RST Pulse Width Valid for Ambient Operating Temperature: TA = –40 to 85°C; VCC = 1.2V to 5.5V (except where noted). For Active High (RST); VCC = VRST (max) RST output for STM810/812 “Glitches” of 100ns or less typically will not generate a RESET pulse. 12/18 STM809/810/811/812 PACKAGE MECHANICAL Figure 16. 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 6. 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 13/18 STM809/810/811/812 Figure 17. SOT143-4 – 4-lead Small Outline Transistor Package Outline E E1 B 0.15 M CAB A1 1 e1 e/2 e D 0.15 M CAB b2 0.20 M CAB A 4X C 0.10 C A2 A 3X b C θ L1 L SOT143-4 C Note: Drawing is not to scale. Table 7. SOT143-4 – 4-lead Small Outline Transistor Package Mechanical Data mm Symbol Typ A A1 A2 b b2 C D E E1 e e1 L L1 Θ N 1.92 0.20 0.55 0.40 0° 4 0.60 10° Min 0.89 0.01 0.88 0.37 0.76 0.09 2.80 2.10 1.20 Max 1.12 0.10 1.02 0.51 0.94 0.18 3.04 2.64 1.40 0.076 0.008 0.022 0.016 0° 4 0.024 10° Typ Min 0.035 0.001 0.035 0.015 0.030 0.004 0.110 0.083 0.047 Max 0.044 0.004 0.042 0.020 0.037 0.007 0.120 0.104 0.055 inches 14/18 STM809/810/811/812 PART NUMBERING Table 8. Ordering Information Scheme Example: STM8XX L WX 6 F Device Type STM8XX 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 (STM809, STM810) W1 = SOT143-4 (STM811, STM812) Temperature Range 6 = –40 to 85°C Shipping Method F = Pb-Free Package (ECO PACK®), Tape & Reel For a list of available options (e.g., Speed, Package) or for further information on any aspect of this device, please contact the ST Sales Office nearest to you. 15/18 STM809/810/811/812 Table 9. Marking Description Part Number STM809L STM809M STM809T STM809S STM809R STM810L STM810M STM810T STM810S STM810R STM811L STM811M STM811T STM811S STM811R STM812L STM812M STM812T STM812S STM812R Reset Threshold 4.63V 4.38V 3.08V 2.93V 2.63V 4.63V 4.38V 3.08V 2.93V 2.63V 4.63V 4.38V 3.08V 2.93V 2.63V 4.63V 4.38V 3.08V 2.93V 2.63V Output Push-Pull RST Push-Pull RST Push-Pull RST Push-Pull RST Push-Pull RST Push-Pull RST Push-Pull RST Push-Pull RST Push-Pull RST Push-Pull RST Push-Pull RST Push-Pull RST Push-Pull RST Push-Pull RST Push-Pull RST Push-Pull RST Push-Pull RST Push-Pull RST Push-Pull RST Push-Pull RST Topside Marking 8AAx 8ABx 8ACx 8ADx 8AEx 8AFx 8AGx 8AHx 8AJx 8AKx 8ALx 8AMx 8ANx 8APx 8AQx 8ARx 8ASx 8ATx 8AUx 8AVx 16/18 STM809/810/811/812 REVISION HISTORY Table 10. Document Revision History Date 02-Sep-03 03-Oct-03 16-Oct-03 17-Nov-03 04-Dec-03 09-Dec-03 10-Feb-04 19-Nov-04 Version 1.0 1.1 1.2 1.3 2.0 2.1 3.0 4.0 First Issue Update Operating Characteristics (Figure 8, 9, 10, 11, 12, 13) Update characteristics (Table 5); modify illustration (Figure 13) Modified with JEDEC timing symbols (Figure 15; Table 5) Reformatted; promoted; updated (Figure 15; Table 5, 6) Correct timing label, combine characteristics (Figure 11; Table 5) Clarify package; update DC Characteristics (Table 5, 8) Update dimensions (Table 6) Revision Details 17/18 STM809/810/811/812 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 18/18