CAT705, CAT706, CAT813 µP Supervisory Circuits FEATURES DESCRIPTION Accurate under voltage system monitoring 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. ¯¯¯¯¯¯ guaranteed valid for VCC = 1.0V RESET 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 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. Pin and function compatible with the MAX705/706/813L products Operating Range from -40°C to +85°C ¯¯¯¯¯¯ 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. Available in SOIC 8-lead and MSOP 8-lead packages APPLICATIONS Microprocessor and microcontroller based systems There is a secondary supply monitor included for power-fail warning (pin PFI). Intelligent instruments The CAT706 has a threshold voltage 4.40V. The CAT705/ CAT813 have a threshold voltage of 4.65V. Control systems Critical µP monitors Portable equipment For Ordering Information details, see page 13. PIN CONFIGURATION PIN FUNCTIONS SOIC 8-Lead Pin Name Function MR 1 8 WDO ¯¯¯ MR Manual Reset input VCC 2 7 RESET VCC Power Supply GND 3 6 WDI PFI 4 5 PFO (RESET for CAT813) GND PFI MSOP 8-Lead 1 8 WDI WDO 2 7 PFO MR 3 6 PFI VCC 4 5 GND RESET (RESET for CAT813) © Catalyst Semiconductor, Inc. Characteristics subject to change without notice 1 Ground Power Fail voltage monitor Input. ¯¯¯¯ PFO Power Fail Output WDI Watchdog Timer Input ¯¯¯¯¯¯ RESET CMOS Push-Pull Active Low Reset Output (CAT705 & CAT706) RESET CMOS Push-Pull Active High Reset Output (CAT813) ¯¯¯¯¯ WDO Watchdog Timer Output Doc. No. MD-3030, Rev. A CAT705, CAT706, CAT813 BLOCK DIAGRAM VCC 250µA MR RESET CONTROLLER RESET (RESET for CAT813) VCC 4.65/4.40V WDI TIMER 52kΩ WATCHDOG TRANSITION DETECTION WATCHDOG TIMER WDO PFI PFO 1.25V Device ¯¯¯¯¯¯ RESET ¯¯¯ MR WDI ¯¯¯¯¯ WDO PFI CAT705 @ 4.65 V x x x @ 1.25 V CAT706 @ 4.40 V x x x @ 1.25 V x x x @ 1.25 V CAT813 Doc. No. MD-3030, Rev. A RESET @ 4.65 V 2 © Catalyst Semiconductor, Inc. Characteristics subject to change without notice CAT705, CAT706, CAT813 ABSOLUTE MAXIMUM RATINGS (1) Parameters Ratings Units 6.5 V -0.3 to (VCC + 0.3) V 20 mA SOIC 8-lead (derate 5.9mW/ºC above +70ºC) 471 mW MSOP 8-lead (derate 4.1mW/ºC above +70ºC) 330 Supply Voltage All other pins ¯¯¯¯ Output Current RST, ¯¯¯¯ RST ,WDO Continuous Power Dissipations (TA = +70ºC) Storage Temperature -65 to 150 ºC Lead Soldering (10 seconds max) +300 ºC ESD Rating: Human Body Model 2000 V ESD Rating: Machine Model 200 V Range Units 1.2 to 5.5 V -0.1 to (VCC + 0.1) V -40 to +85 ºC RECOMMENDED OPERATING CONDITIONS Parameter VCC (TA = -40ºC to +85ºC) All Other Pins Ambient Temperature 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 VRST Supply Current Reset Threshold Conditions CAT705 CAT706 CAT813 CAT706 (R/S/T Versions) CAT705 & CAT813 at -40ºC ≤ TA ≤ +85ºC CAT706 at -40ºC ≤ TA ≤ +85ºC Min Typ Max Units 6 17 µA 4 12 µA 4.50 4.65 4.75 V 4.25 4.40 4.50 V CAT706T at -40ºC ≤ TA ≤ +85ºC 3.00 3.08 3.15 V CAT706S at -40ºC ≤ TA ≤ +85ºC 2.85 2.93 3.00 V CAT706R at -40ºC ≤ TA ≤ +85ºC 2.55 2.63 2.70 V Reset Threshold Tempco Reset Threshold Hysteresis (2) tRD VCC to Reset Delay tRP Reset Active Timeout Period VOH ¯¯¯¯¯¯ Output High RESET Voltage VOL VOH VOL ¯¯¯¯¯¯ Output Low RESET Voltage RESET Output High Voltage RESET Output Low Voltage 40 ppm/ºC CAT705 & CAT813 10 mV CAT706 5 mV VCC = VTH to (VTH - 100mV) 20 µs 140 200 CAT705 & CAT706, VCC = VRST max, ISOURCE = -120µA VCC - 1.5V CAT705 & CAT706, VCC = VRST max, ISOURCE = -30µA 0.8 x VCC 400 ms V CAT705 & CAT706, VCC = VRST min, ISINK = 3.2mA 0.4 CAT705 &CAT706, VCC = 1.2V ISINK = 100µA 0.3 CAT813, VCC = VRST max, ISOURCE = -120µA VCC - 1.5V CAT813, VCC = VRST max, ISOURCE = -30µA 0.8 x VCC V CAT813, VCC = VRST min, ISINK = 3.2mA 0.4 CAT813, VCC = 1.2V ISINK = 100µA 0.3 V 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. Doc. No. MD-3030 Rev. A 4 © Catalyst Semiconductor, Inc. Characteristics subject to change without notice 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 Parameter Conditions Min Typ Max Units 1.00 1.60 2.25 s WATCHDOG INPUT (CAT705, CAT706 & CAT813) tWD Watchdog Timeout Period tWDI WDI Pulse Width VIL VIH VIL = 0.4V, VIH = 0.8 x VCC WDO Output Voltage ns 0.3 x VCC WDI Input Voltage (3) WDI Input Current (4) 50 0.7 x VCC WDI = VCC, Time Average WDI = 0V, Time Average ISOURCE = -800µA 50 -150 -50 VCC – 1.5 VCC – 0.25 ISINK = 1.2mA 0.1 150 0.4 V µA V MANUAL RESET INPUT(CAT705, CAT706 & CAT813) VIL VIH tPB tPDLY 0.3 x VCC ¯¯¯ MR Input Voltage ¯¯¯ MR Pull-up Current ¯¯¯ MR Pulse Width 0.7 x VCC ¯¯¯ MR = 0V 40 70 VCC = 5V PFI Input Current ¯¯¯¯ PFO Output Voltage 140 µA 5 µs 1 µs ¯¯¯ MR low to Reset Delay (5) PFI Input Threshold ISOURCE = -800µA ISINK = 3.2mA V 1.2 1.25 1.3 V -25 0.01 25 nA VCC - 1.5V V 0.4 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. ¯¯¯¯¯¯ for CAT705 & CAT706 & RESET for CAT813. (5) RESET © Catalyst Semiconductor, Inc. Characteristics subject to change without notice 5 Doc. No. MD-3030, Rev. A CAT705, CAT706, CAT813 TYPICAL ELECTRICAL OPERATING CHARACTERISTICS TABLES Normalized Reset Threshold Voltage vs. Temperature VCC Supply Current vs. Temperature NORMALIZED RESET THRESHOLD (V) 9 SUPPLY CURRENT (µA 8 7 6 5 4 3 2 1 -40 -20 0 20 40 60 1.04 1.02 1.00 0.98 0.96 0.94 -40 80 100 120 -20 0 20 40 60 80 100 TEM PERATURE (ºC) TEMPERATURE (°C) TEMPERATURE (ºC) Doc. No. MD-3030 Rev. A 1.06 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, ¯¯¯¯¯¯ (or RESET for the CAT813) are kept active for RESET 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 ¯¯¯¯¯¯ (or RESET) are pulled active. RESET ¯¯¯¯¯¯ (or RESET 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 ¯¯¯) input to allow for alternative control of the Reset (MR reset outputs. The ¯¯¯ MR input is designed for direct 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 ¯¯¯¯¯¯ (or RESET) signals of at least 140ms RESET 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 WDO CAT705 CAT706 CAT813 RESET/RESET WDI PFO PFI Figure 1. Pushbutton RESET tPB MR tPDLY VIH VIL tRP RESET VOH VOL 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 ¯¯¯¯¯¯ (and RESET in the CAT813) signals forces RESET active when the WDI input does not have a transition from low-to-high or high-to-low within 1.12 seconds. ¯¯¯¯¯¯ (RESET Timeout of the watchdog starts when 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. 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. 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 WDO MR VCC GND CAT705 CAT706 CAT813 PIC µC MCLR ADDRESS DECODER RESET/RESET WDI PFO PFI Figure 3. Watchdog Timer Tristate VCC MR VCC GND PFI WDO CAT705 CAT706 CAT813 RESET/RESET 150kΩ WDI PFO 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 VALID STROBE INDETERMINATE STROBE WDI MIN. tWD MAX. RESET Figure 5. Timing Diagram – Strobe Input VCC VRST (MAX) VRST VRST (MIN) tRD RESET (CAT705 & CAT706) VOH RESET Slews with VCC VOL RESET (CAT813) 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 © Catalyst Semiconductor, Inc. Characteristics subject to change without notice 9 Doc. No. MD-3030, Rev. A CAT705, CAT706, CAT813 APPLICATION NOTES OUTPUT VALID CONDITIONS µP’s with Bidirectional Reset Pins ¯¯¯¯¯¯ output can be pulled low by processors The RESET 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. ¯¯¯¯¯¯ output uses a push-pull output which can The RESET maintain a valid output down to a VCC of 1.0 volts. To sink current below 0.8V a resistor can be connected ¯¯¯¯¯¯ to Ground (see Figure 8.) from RESET This ¯¯¯¯¯¯ arrangement will maintain a valid value on the RESET output during both power up and down but will draw ¯¯¯¯¯¯ output is in the high state. A current when the RESET 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. 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. µC WDO MR VCC GND CAT705 CAT706 CAT813 RESET/RESET RESET/RESET WDI 100kΩ PFO PFI ¯¯¯¯¯¯ Valid for VCC < 1.0V Figure 8. RESET 5V UNREGULATED DC µC VCC Push Switch MR WDO VCC RESET/RESET GND CAT705 CAT706 CAT813 PFI WDI PFO NMI RESET/RESET I/O LINE INTERRUPT 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 A1 0.05 0.10 0.15 A2 0.75 0.85 0.95 b 0.22 0.38 c 0.13 0.23 D 2.90 3.00 3.10 E 4.80 4.90 5.00 E1 2.90 3.00 3.10 A E E1 1.10 e L 0.65 BSC 0.40 0.60 0.80 L1 0.95 REF L2 0.25 BSC θ 0º 6º TOP VIEW D A A2 A1 DETAIL A e b c SIDE VIEW 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 E1 E MIN MAX A 1.35 1.75 A1 0.10 0.25 b 0.33 0.51 c 0.19 0.25 D 4.80 5.00 E 5.80 6.20 E1 3.80 e PIN # 1 IDENTIFICATION NOM 4.00 1.27 BSC h 0.25 0.50 L 0.40 1.27 θ 0º 8º TOP VIEW D h A1 θ A 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 Device # CAT 706 Optional Company ID Product Number Suffix R 705 706 813 V I 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 - G Lead Finish G:NiPdAu T3 Tape & Reel T: Tape & Reel 3: 3000/Reel Temperature Range I = Industrial (-40ºC to 85ºC) TOP MARKING INFORMATION (FOR ALL THRESHOLDS) NiPdAu Finish (-G) Device # Package Top Marking CAT705 MSOP ABRT CAT706 MSOP ABRT CAT813 MSOP ABRS ORDERING PART NUMBER Order Part Number Threshold Voltage CAT705VI-G CAT705ZI-G CAT706VI-G CAT706ZI-G CAT706RVI-G CAT706RZI-G CAT706SVI-G CAT706SZI-G CAT706TVI-G CAT706TZI-G CAT813VI-G CAT813ZI-G 4.65V 4.40V 2.63 2.93 3.08 4.65V Notes: (1) All packages are RoHS-compliant (Lead-free, Halogen-free). (2) The standard lead finish is NiPdAu. (3) This device used in the above example is a CAT706RVI -GT3 (2.63V, SOIC 8-Lead, Industrial Temperature, NiPdAu, Tape & Reel, 3,000/reel) (4) 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. CATALYST SEMICONDUCTOR MAKES NO WARRANTY, REPRESENTATION OR GUARANTEE, EXPRESS OR IMPLIED, REGARDING THE SUITABILITY OF ITS PRODUCTS FOR ANY PARTICULAR PURPOSE, NOR THAT THE USE OF ITS PRODUCTS WILL NOT INFRINGE ITS INTELLECTUAL PROPERTY RIGHTS OR THE RIGHTS OF THIRD PARTIES WITH RESPECT TO ANY PARTICULAR USE OR APPLICATION AND SPECIFICALLY DISCLAIMS ANY AND ALL LIABILITY ARISING OUT OF ANY SUCH USE OR APPLICATION, INCLUDING BUT NOT LIMITED TO, CONSEQUENTIAL OR INCIDENTAL DAMAGES. Catalyst Semiconductor products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Catalyst Semiconductor product could create a situation where personal injury or death may occur. Catalyst Semiconductor reserves the right to make changes to or discontinue any product or service described herein without notice. 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