STM6315

STM6315 Open drain microprocessor reset Features ■ ■ ■ ■ ■ ■ ■ Low supply current of 1.5µA (typ) ±1.8% reset threshold accuracy (25°C) Guaranteed RST assertion down to VCC = 1.0V Open drain RST output can exceed VCC Power supply transient immunity Operating temperature: –40 to +125°C Available in SOT143-4 package. SOT143-4 (W1) March 2007 Rev 5 1/21 www.st.com 1 Contents STM6315 Contents 1 2 Summary description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.1 2.2 2.3 2.4 Reset output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Manual reset input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Negative-going VCC transients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Valid RST output down to VCC = 0V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 3 4 5 6 7 8 Typical operating characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 DC and AC parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 2/21 STM6315 List of tables List of tables Table 1. Table 2. Table 3. Table 4. Table 5. Table 6. Table 7. Table 8. Signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Operating and AC measurement conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 DC and AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 SOT143-4 – 4-lead small outline transistor package mechanical data. . . . . . . . . . . . . . . . 17 Ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Marking description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 3/21 List of figures STM6315 List of figures Figure 1. Figure 2. Figure 3. Figure 4. Figure 5. Figure 6. Figure 7. Figure 8. Figure 9. Figure 10. Figure 11. Figure 12. Figure 13. Figure 14. Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 SOT143-4 connections (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Hardware hookup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Reset timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Manual reset timing diagram, switch bounce/debounce . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Supply current vs. supply voltage, VRST = 2.63V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Supply current vs. temperature (no load), VRST = 2.63V . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 RST output voltage vs. output current, VCC = 4.25V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Normalized reset time-out period vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Normalized reset threshold vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Max. transient duration not causing reset pulse vs. reset threshold Overdrive . . . . . . . . . 11 AC testing input/output waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 SOT143-4 – 4-lead small outline transistor package outline . . . . . . . . . . . . . . . . . . . . . . . 17 4/21 STM6315 Summary description 1 Summary description The STM6315 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 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). It also provides a manual reset input (MR). The open drain RST output can be pulled up to a voltage higher than VCC, but less than 6V. The STM6315 comes with standard factory-trimmed reset thresholds of 2.63V, 2.93V, 3.08V, 4.38V, and 4.63V. The STM6315 is available in the SOT143-4 package. Figure 1. Logic diagram VCC MR STM6315 RST VSS AI11162 Table 1. Signal names Description Supply voltage Manual reset input Active-low open drain reset output Ground Symbol VCC MR RST VSS Figure 2. SOT143-4 connections (top view) VSS RST 1 2 4 3 VCC MR AI11163 5/21 Summary description Figure 3. Block diagram VCC VRST COMPARE trec Generator DEBOUNCE STM6315 RST MR AI11164 Figure 4. Hardware hookup VCC VCC VCC 10k STM6315 MCU MR Manual Reset RST(1) RESET Input VSS VSS AI11165 1. Open drain RST output requires external pull-up resistor. 6/21 STM6315 Operation 2 2.1 Operation Reset output The STM6315 Microprocessor Reset Circuit has an active-low, open drain reset output. This output structure will sink current when RST is asserted. Connect a pull-up resistor from RST to any supply voltage up to 6V (see Figure 4 on page 6). Select a resistor value large enough to register a logic low, and small enough to register a logic high while supplying all input current and leakage paths connected to the reset output line. A 10k pull-up is sufficient in most applications. The STM6315 asserts a reset signal to the MCU whenever VCC goes below the reset threshold (VRST), or when the manual reset input (MR) is taken low (see Figure 5 and Figure 6 on page 8). RST is guaranteed valid down to VCC = 1.0V. 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. 2.2 Manual reset input 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 pull-up resistor 63kΩ (typ), 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 standard open push-button switch from MR to VSS to create a manual reset function (see Figure 4 on page 6); external debounce circuitry is not required. If the device is used in a noisy environment, connect a 0.1µF capacitor from MR to VSS to provide additional noise immunity. 2.3 Negative-going VCC transients The STM6315 is relatively immune to negative-going VCC transients (glitches). Figure 12 on page 11 shows typical transient duration versus reset comparator overdrive (for which the STM6315 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 (Reset Threshold 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 (see Figure 12). A 0.1µF bypass capacitor mounted as close as possible to the VCC pin provides additional transient immunity. 7/21 Operation STM6315 2.4 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. Figure 5. Reset timing diagram VCC VRST RST VCC (min) trec AI11166 Figure 6. Manual reset timing diagram, switch bounce/debounce MR Glitch Rejection MR MR Input Pulse Width RST trec MR-to-RST Delay AI11167b 8/21 STM6315 Typical operating characteristics 3 Note: Figure 7. Typical operating characteristics Typical values are at TA = 25°C. Supply current vs. supply voltage, VRST = 2.63V 3.00 2.75 2.50 Supply Current, ICC (µA) 2.25 2.00 1.75 1.50 1.25 1.00 0.75 0.50 0.25 0.00 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 Supply Voltage, VCC (V) 4.0 4.5 5.0 5.5 AI11871c Figure 8. Supply current vs. temperature (no load), VRST = 2.63V 2.25 2.00 Supply Current, ICC (µA) 1.75 1.50 1.25 1.00 0.75 0.50 0.25 0.00 –40 –20 0 20 40 60 Temperature, TA (°C) 80 100 120 AI11872c VCC = 2V VCC = 3V VCC = 4V VCC = 5V 9/21 Typical operating characteristics Figure 9. RST output voltage vs. output current, VCC = 4.25V STM6315 0.20 0.16 Output Voltage (V) 0.12 0.08 0.04 0 0 3 6 Output Current (mA) 9 12 AI11873c Figure 10. Normalized reset time-out period vs. temperature 1.14 Normalized Reset Time-out Period, trec/trec (typ) (–) 1.12 1.10 1.08 1.06 1.04 1.02 1.00 0.98 –40 –20 0 20 40 60 Temperature, TA (°C) 80 100 120 AI11875b 10/21 STM6315 Figure 11. Normalized reset threshold vs. temperature Normalized Reset Threshold, VRST/VRST-typ (–) Typical operating characteristics 1.01 1.005 1 0.995 0.99 –40 –20 0 20 40 60 Temperature, TA (°C) 80 100 120 AI11876c Figure 12. Max. transient duration not causing reset pulse vs. reset threshold Overdrive 100 90 Transient Duration (µs) 80 70 60 50 40 30 20 10 0 1 10 100 Reset Threshold Overdrive (mV) 1000 AI11877 Note: Reset occurs above the curve. 11/21 Maximum rating STM6315 4 Maximum rating Stressing the device above the rating listed in the Table 2: Absolute maximum ratings 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 implied. 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. Table 2. Symbol TSTG TSLD (1) Absolute maximum ratings 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 VIO VCC IO PD 1. Reflow at peak temperature of 260°C (total thermal budget not to exceed 245°C for greater than 30 seconds). 12/21 STM6315 DC and AC parameters 5 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 Reference Voltages STM6315 1.0 to 5.5 –40 to +125 ~5 0.2 to 0.8VCC 0.3 to 0.7VCC Unit V °C ns V V Figure 13. AC testing input/output waveforms 0.8VCC 0.7VCC 0.3VCC AI02568 0.2VCC 13/21 DC and AC parameters Table 4. Sym VCC STM6315 DC and AC characteristics Description Test Condition (1) Min 1.0 VCC = 5.5V, no load TA = –40 to +85°C VCC = 5.5V, no load TA = –40 to +125°C VCC = 3.6V, no load TA = –40 to +85°C VCC = 3.6V, no load TA = –40 to +125°C VCC > 4.25V, ISINK = 3.2mA 1.5 2.0 Typ Max 5.5 12 15 10 12 0.4 0.3 0.3 1 Unit V µA µA µA µA V V V µA Operating voltage ICC VCC supply current VOL RST output voltage VCC > 2.5V, ISINK = 1.2mA VCC > 1.0V, ISINK = 80µA RST output open drain Leakage Current Reset Thresholds Reset threshold (2) VRST (see Table 6 on page 18 for detailed listing) VCC > VRST, RST not asserted VCC falling; TA = 25°C VCC falling; TA = –40 to 85°C VRST – 1.8% VRST + 1.8% V V V µs VRST – 2.5% VRST VRST + 2.5% VRST + 3.5% 35 1 1.5 0.8 20 30 16 140 210 112 1120 1680 896 60 2688 336 2240 48 280 2.4 40 2 VCC falling; TA = –40 to 125°C VRST – 3.5% VCC falling from (VRST + 100mV) to (VRST – 200mV) at 1mV/µs TA = –40 to +85°C TA = –40 to +125°C tRD VCC-to-RST delay ms ms ms ms ms ms ms ms ppm/°C STM6315xAxxxx STM6315xBxxxx trec RST pulse width (2) STM6315xDxxxx TA = –40 to +85°C TA = –40 to +125°C TA = –40 to +85°C TA = –40 to +125°C STM6315xGxxxx Reset threshold temperature coefficient TA = –40 to +85°C TA = –40 to +125°C 14/21 STM6315 Table 4. Sym DC and AC parameters DC and AC characteristics (continued) Description Test Condition (1) Min Typ Max Unit Manual Reset Input VIL MR low input threshold VRST > 4.0V VRST < 4.0V MR low input threshold MR input pulse width MR glitch rejection MR-to-RST delay MR pull-up resistance 32 VRST > 4.0V VRST < 4.0V 1 100 500 63 100 0.8 0.3VCC 2.4 0.7VCC V V V V µs ns ns kΩ VIH 1. Valid for ambient operating temperature: TA = –40 to 125°C; VCC = 2.5 to 5.5V (except where noted). 2. Other VRST thresholds and trec timings are offered. Minimum order quantities may apply. Contact local sales office for availability. 15/21 Package mechanical data STM6315 6 Package mechanical data In order to meet environmental requirements, ST offers these devices in ECOPACK® packages. These packages have a Lead-free second level interconnect. The category of second Level Interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com. 16/21 STM6315 Package mechanical data Figure 14. 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 C SOT143-4 Note: Drawing is not to scale. Table 5. Symbol Typ A A1 A2 b b2 C D E E1 e e1 L L1 Θ N – – – – – – – – – 1.92 0.20 0.55 – Min 0.89 0.01 0.88 0.37 0.76 0.09 2.80 2.10 1.20 – – – 0.40 0° 4 Max 1.12 0.10 1.02 0.51 0.94 0.18 3.04 2.64 1.40 – – – 0.60 10° Typ – – – – – – – – – 0.076 0.008 0.022 – Min 0.035 0.001 0.035 0.015 0.030 0.004 0.110 0.083 0.047 – – – 0.016 0° 4 Max 0.044 0.004 0.042 0.020 0.037 0.007 0.120 0.104 0.055 – – – 0.024 10° SOT143-4 – 4-lead small outline transistor package mechanical data mm inches 17/21 Part numbering STM6315 7 Part numbering Table 6. Example: Ordering information scheme STM6315 R D W1 3 F Device Type STM6315 Reset Threshold Voltage (1) L = VRST = 4.63V M = VRST = 4.38V S = VRST = 2.93V R = VRST = 2.63V RST Pulse Width (1) A = trec = 1.5ms B = trec = 30ms D = trec = 210ms G = trec = 1680ms Package W1 = SOT143-4 Temperature Range 3 = –40 to 125°C Shipping Method F = ECOPACK Package, Tape & Reel 1. Other VRST thresholds and trec timings are offered. Minimum order quantities may apply. Contact local sales office for availability. Note: For other options, or for more information on any aspect of this device, please contact the ST Sales Office nearest you. 18/21 STM6315 Table 7. Marking description Reset Threshold (1) (V) 4.63 4.38 2.93 2.63 2.63 2.63 2.63 RST Pulse Width (1) (ms) 30 210 210 1.5 30 210 1680 Output Open drain RST Open drain RST Open drain RST Open drain RST Open drain RST Open drain RST Open drain RST Part numbering Part Number STM6315LB STM6315MD STM6315SD STM6315RA STM6315RB STM6315RD STM6315RG Topside Marking (2) 9LBx 9MDx 9SDx 9RAx 9RBx 9RDx 9RGx 1. Other VRST thresholds and trec timings are offered. Minimum order quantities may apply. Contact local sales office for availability. 2. Where "x" = Assembly Work Week (A to Z), such that "A" = WW01-02, "B" = WW03-04, and so forth. 19/21 Revision history STM6315 8 Revision history Table 8. Date 14-Nov-2005 08-Feb-2006 12-Apr-2006 27-Jul-2006 21-Mar-2007 Document revision history Revision 1.0 2.0 3 4 5 First edition. Update template, characteristics, marking (Figure 7, 8, 9, 10, and 11; Table 4, 6, and 7). Updated characteristics (Figure 7, 8, and 11; Table 4, 6, and 7). Updated Table 3, 5 and 6. Updated Table 2, 6, and 7. Changes 20/21 STM6315 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. If any part of this document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of such third party products or services or any intellectual property contained therein. UNLESS OTHERWISE SET FORTH IN ST’S TERMS AND CONDITIONS OF SALE ST DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY WITH RESPECT TO THE USE AND/OR SALE OF ST PRODUCTS INCLUDING WITHOUT LIMITATION IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION), OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. UNLESS EXPRESSLY APPROVED IN WRITING BY AN AUTHORIZED ST REPRESENTATIVE, ST PRODUCTS ARE NOT RECOMMENDED, AUTHORIZED OR WARRANTED FOR USE IN MILITARY, AIR CRAFT, SPACE, LIFE SAVING, OR LIFE SUSTAINING APPLICATIONS, NOR IN PRODUCTS OR SYSTEMS WHERE FAILURE OR MALFUNCTION MAY RESULT IN PERSONAL INJURY, DEATH, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE. ST PRODUCTS WHICH ARE NOT SPECIFIED AS "AUTOMOTIVE GRADE" MAY ONLY BE USED IN AUTOMOTIVE APPLICATIONS AT USER’S OWN RISK. Resale of ST products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever, any liability of ST. ST and the ST logo are trademarks or registered trademarks of ST in various countries. Information in this document supersedes and replaces all information previously supplied. The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners. © 2007 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 21/21