CAT706

CAT705, CAT706, CAT813 µP Supervisory Circuits FEATURES Accurate under voltage system monitoring ¯¯¯¯¯¯ RESET guaranteed valid for VCC = 1.0V 6µA supply current 200ms RESET pulse width Watchdog timer function 1.6 sec timeout Brownout detection system reset for use with 3.0, 3.6, and 5.0 volt systems Pin and function compatible with the MAX705/706/813L products Operating Range from -40°C to +85°C Available in SOIC 8-lead and MSOP 8-lead packages DESCRIPTION The CAT705, CAT706, and CAT813 provide reset and monitoring functions for the electronic systems. Each device monitors the system voltage and maintains a reset output until that voltage reaches the device’s specified trip value and then maintains the reset output active condition until the device’s internal timer allows the system power supply to stabilize. The CAT705, CAT706, and CAT813 have a watchdog input which can be used to monitor a system signal and cause a reset to be issued if the signal fails to change state prior to a timeout condition. ¯¯¯¯¯¯ The CAT705 and CAT706 provide a manual RESET input which initiate reset if pulled low. The CAT705, CAT706 and CAT813 provide a RESET output which is low for the CAT705 and CAT706, but high for the CAT813. There is a secondary supply monitor included for power-fail warning (pin PFI). The CAT706 has a threshold voltage 4.40V. The CAT705/ CAT813 have a threshold voltage of 4.65V. For Ordering Information details, see page 13. APPLICATIONS Microprocessor and microcontroller based systems Intelligent instruments Control systems Critical µP monitors Portable equipment PIN CONFIGURATION SOIC 8-Lead MR VCC GND PFI 1 2 3 4 8 7 6 5 WDO RESET (RESET for CAT813) PIN FUNCTIONS Pin Name ¯¯¯ MR VCC GND PFI ¯¯¯¯ PFO WDI WDI PFO PFI Function Manual Reset input Power Supply Ground Power Fail voltage monitor Input. Power Fail Output Watchdog Timer Input CMOS Push-Pull Active Low Reset Output (CAT705 & CAT706) CMOS Push-Pull Active High Reset Output (CAT813) Watchdog Timer Output WDI PFO MSOP 8-Lead RESET (RESET for CAT813) 1 2 3 4 8 7 6 5 ¯¯¯¯¯¯ RESET RESET ¯¯¯¯¯ WDO WDO MR VCC GND © Catalyst Semiconductor, Inc. Characteristics subject to change without notice 1 Doc. No. MD-3030, Rev. A CAT705, CAT706, CAT813 BLOCK DIAGRAM VCC 250µA MR VCC RESET CONTROLLER RESET (RESET for CAT813) 4.65/4.40V TIMER WDI 52kΩ WATCHDOG TRANSITION DETECTION WATCHDOG TIMER WDO PFI PFO 1.25V Device CAT705 CAT706 CAT813 ¯¯¯¯¯¯ RESET @ 4.65 V @ 4.40 V RESET ¯¯¯ MR x x WDI x x x ¯¯¯¯¯ WDO x x x PFI @ 1.25 V @ 1.25 V @ 1.25 V @ 4.65 V x Doc. No. MD-3030, Rev. A 2 © Catalyst Semiconductor, Inc. Characteristics subject to change without notice CAT705, CAT706, CAT813 ABSOLUTE MAXIMUM RATINGS (1) Parameters Supply Voltage All other pins Output Current RST, ¯¯¯¯,WDO RST ¯¯¯¯ Continuous Power Dissipations (TA = +70ºC) SOIC 8-lead (derate 5.9mW/ºC above +70ºC) MSOP 8-lead (derate 4.1mW/ºC above +70ºC) Storage Temperature Lead Soldering (10 seconds max) ESD Rating: Human Body Model ESD Rating: Machine Model RECOMMENDED OPERATING CONDITIONS Parameter VCC (TA = -40ºC to +85ºC) All Other Pins Ambient Temperature Range 1.2 to 5.5 -0.1 to (VCC + 0.1) -40 to +85 Units V V ºC 471 330 -65 to 150 +300 2000 200 ºC ºC V V mW Ratings 6.5 -0.3 to (VCC + 0.3) 20 Units V V mA Notes: (1) Stresses above 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 outside of those listed in the operational sections of this specification is not implied. Exposure to any absolute maximum rating for extended periods may affect device performance and reliability. © Catalyst Semiconductor, Inc. Characteristics subject to change without notice 3 Doc. No. MD-3030, Rev. A CAT705, CAT706, CAT813 ELECTRICAL OPERATING CHARACTERISTICS VCC = 4.5V to 5.5V for CAT705, CAT706, CAT813 versions; VCC = 3.0V to 3.6V for the CAT706 R/S/T versions, -40ºC ≤ TA ≤ +85ºC unless otherwise noted. Typical values at TA = 25ºC and VCC = 5V for CAT705, CAT706 versions; VCC = 3.3V for the CAT706 T/S versions; VCC = 3.0V for the CAT706 R version. (1) Symbol Parameter ICC Supply Current Conditions CAT705 CAT706 CAT813 CAT706 (R/S/T Versions) CAT705 & CAT813 at -40ºC ≤ TA ≤ +85ºC CAT706 at -40ºC ≤ TA ≤ +85ºC CAT706T at -40ºC ≤ TA ≤ +85ºC CAT706S at -40ºC ≤ TA ≤ +85ºC CAT706R at -40ºC ≤ TA ≤ +85ºC Reset Threshold Tempco Reset Threshold Hysteresis tRD tRP VCC to Reset Delay Reset Active Timeout Period ¯¯¯¯¯¯ RESET Output High Voltage CAT705 & CAT706, VCC = VRST max, ISOURCE = -120µA CAT705 & CAT706, VCC = VRST max, ISOURCE = -30µA CAT705 & CAT706, VCC = VRST min, ISINK = 3.2mA CAT705 &CAT706, VCC = 1.2V ISINK = 100µA CAT813, VCC = VRST max, ISOURCE = -120µA CAT813, VCC = VRST max, ISOURCE = -30µA CAT813, VCC = VRST min, ISINK = 3.2mA CAT813, VCC = 1.2V ISINK = 100µA VCC - 1.5V V 0.8 x VCC 0.4 V 0.3 (2) Min Typ 6 4 Max 17 12 4.75 4.50 3.15 3.00 2.70 Units µA µA V V V V V ppm/ºC mV mV µs 4.50 4.25 3.00 2.85 2.55 4.65 4.40 3.08 2.93 2.63 40 VRST Reset Threshold CAT705 & CAT813 CAT706 VCC = VTH to (VTH - 100mV) 140 VCC - 1.5V 0.8 x VCC 10 5 20 200 400 ms VOH V 0.4 0.3 VOL ¯¯¯¯¯¯ RESET Output Low Voltage VOH RESET Output High Voltage VOL RESET Output Low Voltage Notes: (1) Over-temperature limits are guaranteed by design and not production tested. (2) The RESET short-circuit current is the maximum pull-up current when reset is driven low by a bidirectional output. 4 © Catalyst Semiconductor, Inc. Characteristics subject to change without notice Doc. No. MD-3030 Rev. A CAT705, CAT706, CAT813 ELECTRICAL OPERATING CHARACTERISTICS (continued) VCC = 4.50V to 5.5V for CAT705, CAT706 & CAT813 versions; VCC = 3.0V to 3.6V for the CAT706 R/S/T version, -40°C ≤ TA ≤ +85°C unless otherwise noted. Typical values at TA = 25°C and VCC = 5V for CAT705, CAT706, & CAT813 versions; VCC = 3.3V for the CAT706 T/S versions; VCC = 3.0V for the CAT706 R version. Symbol tWD tWDI VIL VIH Parameter Watchdog Timeout Period WDI Pulse Width WDI Input Voltage (3) WDI Input Current (4) WDO Output Voltage WDI = VCC, Time Average WDI = 0V, Time Average ISOURCE = -800µA ISINK = 1.2mA -150 VCC – 1.5 VIL = 0.4V, VIH = 0.8 x VCC Conditions Min 1.00 50 0.3 x VCC 0.7 x VCC 50 -50 VCC – 0.25 0.1 0.4 0.3 x VCC 0.7 x VCC ¯¯¯ = 0V MR 40 1 5 VCC = 5V ISOURCE = -800µA ISINK = 3.2mA 1.2 -25 VCC - 1.5V 0.4 1.25 0.01 1.3 25 70 140 150 Typ 1.60 Max 2.25 Units s ns V µA V WATCHDOG INPUT (CAT705, CAT706 & CAT813) MANUAL RESET INPUT(CAT705, CAT706 & CAT813) VIL VIH tPB tPDLY ¯¯¯ Input Voltage MR ¯¯¯ Pull-up Current MR ¯¯¯ Pulse Width MR ¯¯¯ low to Reset Delay (5) MR PFI Input Threshold PFI Input Current ¯¯¯¯ Output Voltage PFO V µA µs µs V nA V V Notes: (3) WDI is internally serviced within the watchdog period if WDI is left open. (4) The WDI input current is specified as an average input current when the WDI input is driven high or low. The WDI input if connected to a three-stated output device can be disabled in the tristate mode as long as the leakage current is less than 10µA and a maximum capacitance of less than 200pF. To clock the WDI input in the active mode the drive device must be able to source or sink at least 200µA when active. ¯¯¯¯¯¯ (5) RESET for CAT705 & CAT706 & RESET for CAT813. © Catalyst Semiconductor, Inc. Characteristics subject to change without notice 5 Doc. No. MD-3030, Rev. A CAT705, CAT706, CAT813 TYPICAL ELECTRICAL OPERATING CHARACTERISTICS TABLES VCC Supply Current vs. Temperature NORMALIZED RESET THRESHOLD (V) Normalized Reset Threshold Voltage vs. Temperature 1.06 1.04 1.02 1.00 0.98 0.96 0.94 -40 -20 0 20 40 60 80 100 TEM PERATURE (°C) TEMPERATURE (ºC) 9 8 SUPPLY CURRENT (µA 7 6 5 4 3 2 1 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (ºC) Doc. No. MD-3030 Rev. A 6 © Catalyst Semiconductor, Inc. Characteristics subject to change without notice CAT705, CAT706, CAT813 FUNCTIONAL DESCRIPTION PROCESSOR RESET The CAT705, CAT706 & CAT813 detect supply voltage (VCC) conditions that are below the specified voltage trip value (VRST) and provide a reset output to maintain correct system operation. On power-up, ¯¯¯¯¯¯ RESET (or RESET for the CAT813) are kept active for a minimum delay tRP of 140ms after the supply voltage (VCC) rises above VRST to allow the power supply and processor to stabilize. When VCC drops below the voltage trip value (VRST), the reset output signals ¯¯¯¯¯¯ ¯¯¯¯¯¯ RESET (or RESET) are pulled active. RESET (or RESET) is specifically designed to provide the reset input signals for processors. This provides reliable and consistent operation as power is turned on, off or during brownout conditions by maintaining the processor operation in known conditions. MANUAL RESET The CAT705, CAT706 & CAT813 each have a Manual ¯¯¯ Reset (MR ) input to allow for alternative control of the reset outputs. The ¯¯¯ input is designed for direct MR connection to a pushbutton (see Figure 1). The ¯¯¯ MR input is internally pulled up by 52kΩ resistor and must be pulled low to cause the reset outputs to go active. Internally, this input is debounced and timed such that ¯¯¯¯¯¯ RESET (or RESET) signals of at least 140ms minimum will be generated. The min 140ms tRP delay commences as the Manual Reset input is released from the low level. (see Figure 2) MR VCC GND PFI WDO RESET/RESET WDI PFO CAT705 CAT706 CAT813 Figure 1. Pushbutton RESET MR tPDLY VIL tRP RESET VOH VOL tPB VIH RESET Figure 2. Timing Diagram – Pushbutton RESET © Catalyst Semiconductor, Inc. Characteristics subject to change without notice 7 Doc. No. MD-3030, Rev. A CAT705, CAT706, CAT813 WATCHDOG TIMER The CAT705, CAT706, & CAT813 provide a Watchdog input (WDI). The watchdog timer function ¯¯¯¯¯¯ forces RESET (and RESET in the CAT813) signals active when the WDI input does not have a transition from low-to-high or high-to-low within 1.12 seconds. ¯¯¯¯¯¯ Timeout of the watchdog starts when RESET (RESET on the CAT813) becomes inactive. If a transition occurs on the WDI input pin prior to the watchdog time-out, the watchdog timer is reset and begins to time-out again. If the watchdog timer is allowed to time-out, then the reset output(s) will go active for tRP and once released will repeat the watchdog timeout process. Figure 3 below shows a typical implementation of a watchdog function. Any processor signal that repeats dependant on the normal operation of the processor or directed by the software operating on the processor can be used to strobe the watchdog input. The most reliable is a dedicated I/O output transitioned by a specific software instruction. The watchdog can be disabled by floating (or tristating) the WDI input (see Figure 4). If the watchdog is disabled the WDI pin will be pulled low for the first th 7/8 ’s of the watchdog period (tWD) and pulled high for the last 1/8th of the watchdog period. This pulling low of the WDI input and then high is used to detect an open or tri-state condition and will continue to repeat until the WDI input is driven high or low. For most efficient operation of devices with the watchdog function the WDI input should be held low the majority of the time and only strobed high as required to reset the watchdog timer. MR VCC GND PFI WDO RESET/RESET WDI PFO PIC µC MCLR ADDRESS DECODER CAT705 CAT706 CAT813 Figure 3. Watchdog Timer VCC MR VCC GND PFI WDO RESET/RESET WDI PFO Tristate CAT705 CAT706 CAT813 150kΩ µC OUTPUT 110kΩ Figure 4. Watchdog Disable Circuit Doc. No. MD-3030 Rev. A 8 © Catalyst Semiconductor, Inc. Characteristics subject to change without notice CAT705, CAT706, CAT813 INVALID STROBE WDI tWD MIN. MAX. VALID STROBE INDETERMINATE STROBE RESET Figure 5. Timing Diagram – Strobe Input VCC VRST (MAX) VRST VRST (MIN) tRD RESET (CAT705 & CAT706) VOH RESET Slews with VCC RESET (CAT813) VOL Figure 6. Timing Diagram – Power Down VRST (MAX) VRST VRST (MIN) VCC tRP RESET (CAT705 & CAT706) VOH VOL RESET (CAT813) Figure 7. Timing Diagram – Power Up 9 © Catalyst Semiconductor, Inc. Characteristics subject to change without notice Doc. No. MD-3030, Rev. A CAT705, CAT706, CAT813 APPLICATION NOTES µP’s with Bidirectional Reset Pins ¯¯¯¯¯¯ The RESET output can be pulled low by processors like the 68HC11 allowing for a system reset issued by the processor. The maximum pullup current that can be sourced by the CAT705 & CAT706 1.5mA (and by the CAT706 T/R/S is 800µA) allowing the processor to pull the output low even when the CAT70x is pulling it high. Power Transients Generally short duration negative-going transients of less than 2µs on the power supply at VRST minimum will not cause a reset condition. However the lower the voltage of the transient the shorter the required time to cause a reset output. These issues can usually be remedied by the proper location of bypass capacitance on the circuit board. OUTPUT VALID CONDITIONS ¯¯¯¯¯¯ The RESET output uses a push-pull output which can maintain a valid output down to a VCC of 1.0 volts. To sink current below 0.8V a resistor can be connected ¯¯¯¯¯¯ from RESET to Ground (see Figure 8.) This ¯¯¯¯¯¯ arrangement will maintain a valid value on the RESET output during both power up and down but will draw ¯¯¯¯¯¯ current when the RESET output is in the high state. A resistor value of about 100kΩ should be adequate in most situations to maintain a low condition valid output down to VCC equal to 1.0V. µC MR VCC GND PFI WDO RESET/RESET WDI CAT705 CAT706 CAT813 RESET/RESET 100kΩ PFO ¯¯¯¯¯¯ Figure 8. RESET Valid for VCC < 1.0V 5V Push Switch MR UNREGULATED DC VCC GND PFI WDO RESET/RESET WDI PFO VCC NMI RESET/RESET I/O LINE INTERRUPT µC CAT705 CAT706 CAT813 Figure 9. Typical Operating Circuit Doc. No. MD-3030 Rev. A 10 © Catalyst Semiconductor, Inc. Characteristics subject to change without notice CAT705, CAT706, CAT813 PACKAGE OUTLINE DRAWING MSOP 8-Lead 3.0 x 3.0mm (Z) (1) (2) SYMBOL MIN NOM MAX A A1 A2 b c D E E1 1.10 0.05 0.75 0.22 0.13 2.90 4.80 2.90 0.40 3.00 4.90 3.00 0.65 BSC 0.60 0.95 REF 0.25 BSC 0º 6º 0.80 0.10 0.85 0.15 0.95 0.38 0.23 3.10 5.00 3.10 E E1 e L L1 L2 θ TOP VIEW D A A2 DETAIL A A1 e SIDE VIEW b c END VIEW θ L2 L L1 DETAIL A For current Tape and Reel information, download the PDF file from: http://www.catsemi.com/documents/tapeandreel.pdf. Notes: (1) All dimensions are in millimeters. Angles in degrees. (2) Complies with JEDEC MO-187 © Catalyst Semiconductor, Inc. Characteristics subject to change without notice 11 Doc. No. MD-3030, Rev. A CAT705, CAT706, CAT813 SOIC 8-Lead 150 mils (V) (1) (2) SYMBOL MIN NOM MAX A A1 b c E1 E 1.35 0.10 0.33 0.19 4.80 5.80 3.80 1.27 BSC 0.25 0.40 0º 1.75 0.25 0.51 0.25 5.00 6.20 4.00 0.50 1.27 8º D E E1 e h L θ PIN # 1 IDENTIFICATION TOP VIEW D h A1 A θ c e b L SIDE VIEW END VIEW For current Tape and Reel information, download the PDF file from: http://www.catsemi.com/documents/tapeandreel.pdf. Notes: (1) All dimensions are in millimeters. Angles in degrees. (2) Complies with JEDEC MS-012. Doc. No. MD-3030 Rev. A 12 © Catalyst Semiconductor, Inc. Characteristics subject to change without notice CAT705, CAT706, CAT813 EXAMPLE OF ORDERING INFORMATION (1) Prefix CAT Optional Company ID Device # 706 Product Number Suffix R V Package V: SOIC 8-Lead Z: MSOP 8-Lead Reset Threshold Voltage Blank: See Ordering Part Number table T: 3.08V S: 2.93V R: 2.63V I -G Lead Finish G:NiPdAu T3 Tape & Reel T: Tape & Reel 3: 3000/Reel 705 706 813 Temperature Range I = Industrial (-40ºC to 85ºC) TOP MARKING INFORMATION (FOR ALL THRESHOLDS) NiPdAu Finish (-G) Device # CAT705 CAT706 CAT813 Package MSOP MSOP MSOP Top Marking ABRT ABRT ABRS ORDERING PART NUMBER Order Part Number CAT705VI-G CAT705ZI-G CAT706VI-G CAT706ZI-G CAT706RVI-G CAT706RZI-G CAT706SVI-G CAT706SZI-G CAT706TVI-G CAT706TZI-G CAT813VI-G CAT813ZI-G Threshold Voltage 4.65V 4.40V 2.63 2.93 3.08 4.65V Notes: (1) All packages are RoHS-compliant (Lead-free, Halogen-free). (2) (3) (4) The standard lead finish is NiPdAu. This device used in the above example is a CAT706RVI -GT3 (2.63V, SOIC 8-Lead, Industrial Temperature, NiPdAu, Tape & Reel, 3,000/reel) Contact factory for package availability. © Catalyst Semiconductor, Inc. Characteristics subject to change without notice 13 Doc. No. MD-3030, Rev. A REVISION HISTORY Date 01/21/08 Rev. A Reason Initial Issue Copyrights, Trademarks and Patents © Catalyst Semiconductor, Inc. Trademarks and registered trademarks of Catalyst Semiconductor include each of the following: Adaptive Analog™, Beyond Memory™, DPP™, EZDim™, LDD™, MiniPot™, Quad-Mode™ and Quantum Charge Programmable™ Catalyst Semiconductor has been issued U.S. and foreign patents and has patent applications pending that protect its products. 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Products with data sheets labeled "Advance Information" or "Preliminary" and other products described herein may not be in production or offered for sale. Catalyst Semiconductor advises customers to obtain the current version of the relevant product information before placing orders. Circuit diagrams illustrate typical semiconductor applications and may not be complete. Catalyst Semiconductor, Inc. Corporate Headquarters 2975 Stender Way Santa Clara, CA 95054 Phone: 408.542.1000 Fax: 408.542.1200 www.catsemi.com Document No: MD-3030 Revision: A Issue date: 01/21/08