TPS3813J25-EP,, TPS3813L30-EP TPS3813K33-EP, TPS3813I50-EP www.ti.com SGLS343A – MAY 2006 – REVISED MAY 2006 PROCESSOR SUPERVISORY CIRCUITS WITH WINDOW-WATCHDOG FEATURES APPLICATIONS • • • • • • • • • • • • (1) Controlled Baseline – One Assembly/Test Site, One Fabrication Site Extended Temperature Performance of -55°C to 125°C Enhanced Diminishing Manufacturing Sources (DMS) Support Enhanced Product-Change Notification Qualification Pedigree (1) Window-Watchdog With Programmable Delay and Window Ratio 6-Pin SOT-23 Package Supply Current of 9 µA (Typ) Power On Reset Generator With a Fixed Delay Time of 25 ms Precision Supply Voltage Monitor 2.5 V, 3 V, 3.3 V, 5 V Open-Drain Reset Output • • • Applications Using DSPs, Microcontrollers, or Microprocessors Safety Critical Systems Automotive Systems Healing Systems TPS3813 DBV PACKAGE (TOP VIEW) WDI 1 6 RESET GND 2 5 WDR WDT 3 4 VDD ACTUAL SIZE 3,00 mm x 3,00 mm Component qualification in accordance with JEDEC and industry standards to ensure reliable operation over an extended temperature range. This includes, but is not limited to, Highly Accelerated Stress Test (HAST) or biased 85/85, temperature cycle, autoclave or unbiased HAST, electromigration, bond intermetallic life, and mold compound life. Such qualification testing should not be viewed as justifying use of this component beyond specified performance and environmental limits. DESCRIPTION The TPS3813 family of supervisory circuits provides circuit initialization and timing supervision, primarily for DSPs and processor-based systems. During power on, RESET is asserted when supply voltage (VDD) becomes higher than 1.1 V. Thereafter, the supervisory circuit monitors VDD and keeps RESET active as long as VDD remains below the threshold voltage (VIT). An internal timer delays the return of the output to the inactive state (high) to ensure proper system reset. The delay time, td = 25 ms typical, starts after VDD has risen above the threshold voltage (VIT). When the supply voltage drops below the threshold voltage (VIT), the output becomes active (low) again. No external components are required. All the devices of this family have a fixed-sense threshold voltage (VIT) set by an internal voltage divider. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright © 2006, Texas Instruments Incorporated TPS3813J25-EP,, TPS3813L30-EP TPS3813K33-EP, TPS3813I50-EP www.ti.com SGLS343A – MAY 2006 – REVISED MAY 2006 TYPICAL OPERATING CIRCUIT VDD 0.1 µF 0.1 µF R VDD WDR VDD RESET RESET TPS3813 WDT uC WDI I/O GND CWP GND These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. DESCRIPTION (CONTINUED) For safety critical applications the TPS3813 family incorporates a so-called window-watchdog with programmable delay and window ratio. The upper limit of the watchdog time-out can be set by either connecting WDT to GND, VDD, or using an external capacitor. The lower limit and thus the window ratio is set by connecting WDR to GND or VDD. The supervised processor now needs to trigger the TPS3813 within this window not to assert a RESET. The product spectrum is designed for supply voltages of 2.5 V, 3 V, 3.3 V, and 5 V. The circuits are available in a 6-pin SOT-23 package. The TPS3813 devices are characterized for operation over a temperature range of –55°C to 125°C. PACKAGE INFORMATION TA –55°C to 125°C DEVICE NAME THRESHOLD VOLTAGE MARKING TPS3813J25MDBVREP 2.25 V PLEM TPS3813L30MDBVREP 2.64 V PLFM TPS3813K33MDBVREP 2.93 V PLGM TPS3813I50MDBVREP 4.55 V PLHM ORDERING INFORMATION TPS381 3 J 25 DBV R Reel Package Nominal Supply Voltage Nominal Threshold Voltage Functionality Family TPS3813 FUNCTION/TRUTH TABLE VDD > VIT 2 RESET 0 L 1 H Submit Documentation Feedback TPS3813J25-EP,, TPS3813L30-EP TPS3813K33-EP, TPS3813I50-EP www.ti.com SGLS343A – MAY 2006 – REVISED MAY 2006 RESET Oscillator WDT Reset Logic and Timer Detection Circuit VDD GND Power to circuitry Watchdog Ratio Detection R1 + _ WDR R2 Bandgap Voltage Reference GND GND Rising Edge Detection WDI GND VDD VIT 0.6 V t td td td RESET Output Condition Undefined Output Condition Undefined t WDI 1st Window Without Lower Boundary t 2nd Window With Lower Boundary 3rd Window With Lower Boundary Trigger Pulse 1st Window Lower Window Without Lower 2nd Window 1st Window Boundary Boundary With Lower Without Lower Boundary Boundary 3rd Window With Lower Boundary Figure 1. Timing Diagram The lower boundary of the watchdog window starts with the rising edge of the WDI trigger pulse. At the same time, all internal timers will be reset. If an external capacitor is used, the lower boundary is impacted due to the different oscillator frequency. This is described in more detail in the following section. The timing diagram and especially the shaded boundary is prepared in a nonreal ratio scale to better visualize the description. Submit Documentation Feedback 3 TPS3813J25-EP,, TPS3813L30-EP TPS3813K33-EP, TPS3813I50-EP www.ti.com SGLS343A – MAY 2006 – REVISED MAY 2006 Terminal Functions TERMINAL NAME NO. I/O DESCRIPTION GND 2 I Ground RESET 6 O Open-drain reset output VDD 4 I Supply voltage and supervising input WDI 1 I Watchdog timer input WDR 5 I Selectable watchdog window ratio input WDT 3 I Programmable watchdog delay input DETAILED DESCRIPTION IMPLEMENTED WINDOW-WATCHDOG SETTINGS There are two different ways to set up the watchdog window. The first way is to use the implemented timing which is a default setting. Or, the default settings can be activated by wiring the WDT and WDR pin to VDD or GND. There are a total of four different timings available with these settings which are listed in the table below. SELECTED OPERATION MODE WDR = 0 V WDT = 0 V WDR = VDD WDR = 0 V WDT = VDD WDR = VDD WINDOW FRAME LOWER WINDOW FRAME Max = 0.3 s Max = 9.46 ms Typ = 0.25 s Typ = 7.86 ms Min = 0.2 s Min = 6.27 ms Max = 0.3 s Max = 2.43 ms Typ = 0.25 s Typ = 2 ms Min = 0.2 s Min = 1.58 ms Max = 3 s Max = 93.8 ms Typ = 2.5 s Typ = 78.2 ms Min = 2 s Min = 62.5 ms Max = 3 s Max = 23.5 ms Typ = 2.5 s Typ = 19.6 ms Min = 2 s Min = 15.6 ms To visualize the values named in the table, a timing diagram (see Figure 2) was prepared. The timing diagram is used to describe the upper and lower boundary settings. For an application, the important boundaries are the tboundary,max and twindow,min. Within these values, the watchdog timer should be retriggered to avoid a timeout condition or a boundary violation in the event of a trigger pulse in the lower boundary. The values in the table above are typical and worst case conditions. They are valid over the whole temperature range of –55°C to 125°C. ÎÎ ÎÎ ÎÎ ÎÎ ÎÎ ÎÎ ÎÎ ÎÎ ÎÎ ÎÎ ÎÎ ÎÎ In the shaded area of Figure 2, it cannot be predicted if the device will detect a violation or not and release a reset. This is also the case between the boundary tolerance of tboundary,min and tboundary,max as well as between twindow,min and twindow,max. It is important to set up the trigger pulses accordingly to avoid violations in these areas. WDI Detection of Rising Edge tboundary, min tboundary, max Window Frame to Reset the WDI tboundary, typ twindow, typ twindow, min twindow, max Figure 2. Upper and Lower Boundary Visualization 4 Submit Documentation Feedback t TPS3813J25-EP,, TPS3813L30-EP TPS3813K33-EP, TPS3813I50-EP www.ti.com SGLS343A – MAY 2006 – REVISED MAY 2006 TIMING RULES OF WINDOW-WATCHDOG After the reset of the supervisor is released, the lower boundary of the first WDI window is disabled. However, after the first WDI pulse low-to-high transition is detected, the lower boundary function of the window is enabled. All further WDI pulses will need to fit into the configured window frame. PROGRAMMABLE WINDOW-WATCHDOG BY USING AN EXTERNAL CAPACITOR The upper boundary of the watchdog timer can be set by an external capacitor connected between the WDT pin and GND. Common consumer electronic capacitors can be used to implement this feature. They should have low ESR and low tolerances since the tolerances have to be considered if the calculations are performed. The first formula is used to calculate the upper window frame. After calculating the upper window frame, the lower boundary can be calculated. As in the last example, the most important values are the tboundary,max and twindow,min. The trigger pulse has to fit into this window frame. The external capacitor should have a value between a minimum of 47 pF and a maximum of 63 nF. SELECTED OPERATION MODE WDT = external capacitor C(ext) t window,typ + ǒ WDR = 0 V and WDR = VDD Ǔ C WINDOW FRAME (ext) )1 15.55 pF twindow,max = 1.25 x twindow,typ twindow,min = 0.75 x twindow,typ 6.25 ms (1) LOWER BOUNDARY CALCULATION The lower boundary can be calculated based on the values given in the switching characteristics. Additionally, facts have to be taken into account to verify that the lower boundary is where it is expected. Since the internal oscillator of the window watchdog is running free, any rising edge at the WDI pin will be taken into account at the next internal clock cycle. This happens regardless of the external source. Since the shift between internal and external clock is not known, it is best to consider the worst case condition for calculating this value. SELECTED OPERATION MODE LOWER BOUNDARY OF FRAME tboundary,max = twindow,max / 23.5 WDR = 0 V tboundary,typ = twindow,typ / 25.8 tboundary,min = twindow,min / 28.7 WDT = external capacitor C(ext) tboundary,max = twindow,max / 51.6 WDR = VDD tboundary,typ = twindow,typ / 64.5 tboundary,min = twindow,min / 92.7 WATCHDOG SOFTWARE CONSIDERATIONS To benefit from the window watchdog feature and help the watchdog timer monitor the software execution more closely, it is recommended that the watchdog be set and reset at different points in the program rather than pulsing the watchdog input periodically by using the prescaler of a microcontroller or DSP. Furthermore, the watchdog trigger pulses should be set to different timings inside the window frame to release a defined reset, if the program should hang in any subroutine. This allows the window watchdog to detect timeouts of the trigger pulse as well as pulses that distort the lower boundary. APPLICATION EXAMPLE A typical application example (see Figure 3) is used to describe the function of the watchdog in more detail. To configure the window watchdog function, two pins are provided by the TPS3813. These pins set the window timeout and ratio. The window watchdog ratio is a fixed ratio, which determines the lower boundary of the window frame. It can be configured in two different frame sizes. Submit Documentation Feedback 5 TPS3813J25-EP,, TPS3813L30-EP TPS3813K33-EP, TPS3813I50-EP www.ti.com SGLS343A – MAY 2006 – REVISED MAY 2006 If the window watchdog ratio pin (WDR) is set to VDD, Position 1 in Figure 3, then the lower window frame is a value based on a ratio calculation of the overall window timeout size: For the watchdog timeout pin (WDT) connected to GND, it is a ratio of 1:124.9, for WDT connected to VDD, it is a ratio of 1:127.7, and for an external capacitor connected to WDT, it is a ratio of 1:64.5. If the window watchdog ratio pin (WDR) is set to GND, Position 2, the lower window frame will be a value based on a ratio calculation of the overall window timeout size: For the watchdog timeout pin (WDT) connected to GND, it will be a ratio of 1:31.8, for WDT connected to VDD it will be 1:32, and for an external capacitor connected to WDT it will be 1:25.8. The watchdog timeout can be set in two fixed timings of 0.25 seconds and 2.5 seconds for the window or can by programmed by connecting a external capacitor with a low leakage current at WDT. Example: If the watchdog timeout pin (WDT) is connected to VDD, the timeout will be 2.5 seconds. If the window watchdog ratio pin (WDR) is set in this configuration to a ratio of 1:127.7 by connecting the pin to VDD, the lower boundary is 19.6 ms. VDD 0.1 µF 0.1 µF VDD R Position 1 See Note A VDD Position 2 See Note B WDR RESET WDT Position 5 See Note E Position 3 See Note C uC WDI GND VDD A. Watchdog window ratio B. Watchdog timeout set to typical 2.5 sec C. Watchdog timeout programmed by external capacitor D. Watchdog timeout set to typical 0.25 sec Figure 3. Application Example 6 RESET TPS3813 Position 4 See Note D C(ext) VDD Submit Documentation Feedback I/O GND TPS3813J25-EP,, TPS3813L30-EP TPS3813K33-EP, TPS3813I50-EP www.ti.com SGLS343A – MAY 2006 – REVISED MAY 2006 ABSOLUTE MAXIMUM RATINGS over operating free-air temperature range (unless otherwise noted) (1) UNIT Supply voltage (2) VDD 7V RESET –0.3 V to VDD + 0.3 V All other pins (2) –0.3 V to 7 V IOL Maximum low output current 5 mA IOH Maximum high output current –5 mA IIK Input clamp current (VI < 0 or VI > VDD) ±20 mA IOK Output clamp current (VO < 0 or VO > VDD) ±20 mA Continuous total power dissipation See Dissipation Rating Table TA Operating free-air temperature range –55°C to 125°C Tstg Storage temperature range –65°C to 150°C Soldering temperature (2) Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. All voltage values are with respect to GND. For reliable operation, the device should not be operated at 7 V for more than t = 1000h continuously. DISSIPATION RATING TABLE PACKAGE TA < 25°C POWER RATING DERATING FACTOR ABOVE TA = 25°C TA = 70°C POWER RATING TA = 85°C POWER RATING DBV 437 mW 3.5 mW/°C 280 mW 227 mW 100 Estimated Years of Life (1) 260°C 10 1 120 125 130 135 140 145 150 155 160 Continuous TJ − 5C Figure 4. TPS3813K33DBV Wirebond Life Submit Documentation Feedback 7 TPS3813J25-EP,, TPS3813L30-EP TPS3813K33-EP, TPS3813I50-EP www.ti.com SGLS343A – MAY 2006 – REVISED MAY 2006 RECOMMENDED OPERATING CONDITIONS at specified temperature range MIN MAX VDD Supply voltage 2 6 UNIT V VI Input voltage 0 VDD + 0.3 V VIH High-level input voltage VIL Low-level input voltage ∆t/∆V Input transition rise and fall rate tw Pulse width of WDI trigger pulse TA Operating free-air temperature range 0.7 x VDD V 0.3 x VDD V 100 ns/V 125 °C 50 ns –55 ELECTRICAL CHARACTERISTICS over recommended operating free-air temperature range (unless otherwise noted) PARAMETER VOL TEST CONDITIONS Low-level output voltage Power up reset voltage MIN 0.2 VDD = 3.3 V IOL = 2 mA 0.4 VDD = 6 V, IOL = 4 mA 0.4 VDD ≥ 1.1 V, IOL= 50 µA (1) 0.2 TPS3813J25 VIT Negative-going input threshold voltage (2) TPS3813L30 TPS3813K33 TA = 25°C TA = Full Range Hysteresis 2.2 2.25 2.3 2.58 2.64 2.7 2.87 2.93 2.8 TPS3813I50 Vhys 4.45 IIL TPS3813L30 35 TPS3813K33 40 WDI, WDR WDI = VDD = 6 V, WDR = VDD = 6 V WDT WDT = VDD = 6 V, VDD > VIT, RESET = High WDI, WDR WDI = 0 V, WDR = 0 V, VDD = 6 V Low-level input current High-level output current IDD Supply current CI Input capacitance (1) (2) V V V 4.65 mV 60 High-level input current IOH 4.55 30 WDT 3 UNIT 3.1 TPS3813J25 TPS3813I50 IIH TYP MAX VDD = 2 V to 6 V, IOL = 500 µA WDT = 0 V, VDD > VIT, RESET = High TA = 25°C TA = Full Range TA = 25°C TA = Full Range TA = 25°C TA = Full Range TA = 25°C TA = Full Range –100 100 –1000 1000 –100 100 –1000 1000 –100 100 –1000 1000 –100 100 –1000 1000 TA = 25°C VDD = VOH = 6 V 100 TA = Full Range 1000 VDD = 2 V output unconnected 9 13 VDD = 5 V output unconnected 20 25 VI = 0 V to VDD 5 nA nA µA pF The lowest supply voltage at which RESET becomes active. tr, VDD ≥ 15 µs/V. To ensure the best stability of the threshold voltage, a bypass capacitor (ceramic, 0.1 µF) should be placed near the supply terminals. TIMING REQUIREMENTS at RL = 1 MΩ, CL = 50 pF, TA = –40°C to 85°C PARAMETER tw 8 Pulse width at VDD TEST CONDITIONS VDD = VIT– + 0.2 V, VDD = VIT–– 0.2 V Submit Documentation Feedback MIN 3 TYP MAX UNIT µs TPS3813J25-EP,, TPS3813L30-EP TPS3813K33-EP, TPS3813I50-EP www.ti.com SGLS343A – MAY 2006 – REVISED MAY 2006 SWITCHING CHARACTERISTICS at RL = 1 MΩ, CL = 50 pF, TA = -55°C to 125°C PARAMETER TEST CONDITIONS VDD ≥ VIT + 0.2 V, See Figure 1 td Delay time tt(out Watchdog time-out Upper limit ) MIN TA = 25°C 20 TA = Full Range 15 0.25 2.5 (1) See s (2) ms 1:25.8 WDR = VDD, WDT = 0 V 1:124.9 WDR = VDD, WDT = VDD 1:127.7 WDR = VDD, WDT = programmable (1) (2) ms 1:32 WDR = 0 V, WDT = programmable VDD to RESET delay UNIT 1:31.8 WDR = 0 V, WDT = VDD tPHL 30 40 WDT = VDD WDR = 0 V, WDT = 0 V Propagation (delay) time, high-to-low-level output 25 WDT = 0 V WDT = programmable Watchdog window ratio TYP MAX 1:64.5 VIL = VIT - 0.2 V, VIH = VIT + 0.2 V µs 30 155 pF < C(ext) < 63 nF (C(ext) ÷ 15.55 pF + 1) x 6.25 ms TYPICAL CHARACTERISTICS SUPPLY CURRENT vs SUPPLY VOLTAGE LOW-LEVEL OUTPUT VOLTAGE vs LOW-LEVEL OUTPUT CURRENT 2 20 WDI = GND, WDT = GND, WDR = GND 16 85°C 14 12 25°C 10 8 −40°C 6 0°C 4 1.50 25°C 1.25 1 0.75 85°C 0°C 0.50 −40°C 0.25 2 0 VDD = 2 V, WDI = GND, WDT = GND, WDR = GND 1.75 VOL − Low-Level Output Voltage − V I DD − Supply Current − µ A 18 0 1 2 3 4 5 6 0 0 VDD − Supply Voltage − V 1 2 3 4 5 6 7 IOL − Low-Level Output Current − mA Figure 5. Figure 6. Submit Documentation Feedback 9 TPS3813J25-EP,, TPS3813L30-EP TPS3813K33-EP, TPS3813I50-EP www.ti.com SGLS343A – MAY 2006 – REVISED MAY 2006 TYPICAL CHARACTERISTICS (continued) NORMALIZED INPUT THRESHOLD VOLTAGE vs FREE-AIR TEMPERATURE AT VDD VIT − Normalized Input Threshold Voltage − V (25 ° C) INPUT CURRENT vs INPUT VOLTAGE AT WDT 1000 800 I − Input Current − nA 600 25°C 400 85°C 200 0°C 0 −200 −40°C −400 I VDD = 6 V, WDI = GND, WDR = GND −600 −800 −1000 0 1 2 3 4 5 6 1.001 1.000 0.999 0.998 0.997 WDI = Triggered, WDR = GND, WDT = GND 0.996 0.995 −40 −20 0 Figure 7. Figure 8. t W − Minimum Pulse Duration at V DD − µ s 20 MINIMUM PULSE DURATION AT VDD vs VDD THRESHOLD OVERDRIVE VOLTAGE 18 16 14 12 10 8 6 4 2 0 0 40 60 TA − Free-Air Temperature At VDD − °C VI − Input Voltage at WDT − V 0.2 0.4 0.6 0.8 1 1.2 VDD − Threshold Overdrive Voltage − V Figure 9. 10 20 Submit Documentation Feedback 1.4 80 PACKAGE OPTION ADDENDUM www.ti.com 22-Sep-2008 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Drawing Pins Package Eco Plan (2) Qty 2T13K33MDBVREPG4 ACTIVE SOT-23 DBV 6 3000 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM TPS3813K33MDBVREP ACTIVE SOT-23 DBV 6 3000 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM V62/06627-01XE ACTIVE SOT-23 DBV 6 3000 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Lead/Ball Finish MSL Peak Temp (3) (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined. Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above. Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material) (3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. 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OTHER QUALIFIED VERSIONS OF TPS3813K33-EP : • Catalog: TPS3813K33 NOTE: Qualified Version Definitions: • Catalog - TI's standard catalog product Addendum-Page 1 PACKAGE MATERIALS INFORMATION www.ti.com 6-Aug-2008 TAPE AND REEL INFORMATION *All dimensions are nominal Device TPS3813K33MDBVREP Package Package Pins Type Drawing SPQ SOT-23 3000 DBV 6 Reel Reel Diameter Width (mm) W1 (mm) 180.0 9.0 Pack Materials-Page 1 A0 (mm) B0 (mm) K0 (mm) P1 (mm) 3.15 3.2 1.4 4.0 W Pin1 (mm) Quadrant 8.0 Q3 PACKAGE MATERIALS INFORMATION www.ti.com 6-Aug-2008 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) TPS3813K33MDBVREP SOT-23 DBV 6 3000 182.0 182.0 20.0 Pack Materials-Page 2 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. 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