CAT705, CAT706, CAT813 µP Supervisory Circuits FEATURES DESCRIPTION n Reset guaranteed valid for 1.0 V VCC 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. n 6µA supply current n 200ms Reset pulse width n Watchdog timer function 1.6s timeout n Accurate brownout detection reset in 3.0, 3.6, and 5.0 volt systems The devices have a watchdog input which can be ¯¯¯¯ to used to monitor a system signal and causes WDO go low if the signal fails to change state prior to a timeout condition. n Secondary low supply monitoring on PFI input n Pin and function compatible with the MAX705/MAX706/MAX813L products n Operating Range from -40°C to +85°C The supervisory circuits provide a ¯¯¯ MR input which initiates a reset if pulled low. The CAT705 and ¯¯¯¯¯¯ output. The CAT706 provide an active low RESET CAT813 provides an active high RESET output. n RoHS Compliant SOIC 8-lead and MSOP 8-lead packages APPLICATIONS There is a secondary supply monitor (PFI) included for power-fail warning. n Microprocessor and microcontroller based systems n Instrument and control systems n Portable equipment For Ordering Information details, see page 13. PIN FUNCTIONS PIN CONFIGURATION Pin Name SOIC 8-Lead MR 1 8 WDO Function ¯¯¯ MR Manual Reset Input VCC Power Supply VCC 2 7 GND 3 6 WDI PFI PFI 4 5 PFO ¯¯¯¯ PFO Power Fail Output WDI Watchdog Timer Input RESET GND (RESET for CAT813) MSOP 8-Lead CMOS Push-Pull Active Low Reset Output (CAT705 & CAT706) PFO RESET CMOS Push-Pull Active High Reset Output (CAT813) 6 PFI ¯¯¯¯¯ WDO Watchdog Timer Output 5 GND 8 WDI WDO 2 7 MR 3 VCC 4 (RESET for CAT813) © 2010 SCILLC. All rights reserved. Characteristics subject to change without notice Power Fail voltage monitor Input. ¯¯¯¯¯¯ RESET 1 RESET Ground 1 Doc. No. MD-3030, Rev. D CAT705, CAT706, CAT813 BLOCK DIAGRAM VCC 70µA MR RESET CONTROLLER RESET (RESET for CAT813) VCC VRST 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 x x x x @ 1.25 V x x x @ 1.25 V CAT813 Doc. No. MD-3030, Rev. D RESET @ 4.65 V 2 © 2010 SCILLC. All rights reserved. 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 ¯¯¯¯¯¯,WDO ¯¯¯¯ Output Current RESET, RESET 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 1.0 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. © 2010 SCILLC. All rights reserved. Characteristics subject to change without notice 3 Doc. No. MD-3030, Rev. D CAT705, CAT706, CAT813 ELECTRICAL OPERATING CHARACTERISTICS Typical values at TA = 25ºC and VCC = 5V for CAT705, CAT706 and CAT813 versions. (1) VCC = 3.3V for the CAT706 T/S versions; VCC = 3.0V for the CAT706 R version. Symbol Parameter ICC VRST Conditions CAT705 CAT706 CAT813 CAT706 (R/S/T Versions) CAT705 & CAT813 at -40ºC ≤ TA ≤ +85ºC CAT706 at -40ºC ≤ TA ≤ +85ºC Supply Current Reset Threshold 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 (1) Tempco Reset Threshold (1) Hysteresis tRD VCC to Reset Delay tRP Reset Active Timeout Period VOH VOL VOH VOL (2) ¯¯¯¯¯¯ Output High RESET Voltage ¯¯¯¯¯¯ 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) 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. D 4 © 2010 SCILLC. All rights reserved. Characteristics subject to change without notice CAT705, CAT706, CAT813 ELECTRICAL OPERATING CHARACTERISTICS (continued) Typical values at TA = 25°C and VCC = 5V for CAT705, CAT706, and 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 1.6 2.25 s WATCHDOG INPUT tWD Watchdog Timeout Period tWP WDI Pulse Width VIL VIH VIL = 0.4 V, VIH = 0.8 x VCC WDI Input Voltage WDI Input Current 50 ns 0.3 x VCC (3) 0.7 x VCC WDI = VCC, Time Average (4) WDI = 0V, Time Average VW_OH WDO Output Voltage 50 -150 VRST (max) < VCC < 3.6 V ISOURCE = -500 µA 0.8 x VCC 4.5 V < VCC < 5.5 V, ISOURCE = -800 µA VCC – 1.5 -50 µA VCC – 0.25 V VRST (max) < VCC < 3.6 V, ISINK = +500 µA VW_OL 150 V 0.3 4.5 V < VCC < 5.5 V, ISINK = 1.2 mA 0.1 0.4 MANUAL RESET INPUT VIL VIH tPB tPDLY 0.3 x VCC ¯¯¯ MR Input Voltage 0.7 x VCC ¯¯¯ MR Pull-up Current ¯¯¯ MR Pulse Width ¯¯¯ MR low to Reset Delay ¯¯¯ MR = 0 V 40 70 140 1 V µA µs (5) 5 µs POWER-FAIL INPUT PFI Input Threshold VCC = 5 V PFI Input Current VP_OH ¯¯¯¯ PFO Output Voltage VP_OL 1.2 1.25 1.3 V -25 0.01 25 nA VRST (max) < VCC < 3.6 V, ISOURCE = -500 µA 0.8 x VCC 4.5 V < VCC < 5.5 V, ISOURCE = -800 µA VCC - 1.5V 0.4 V VRST (max) < VCC < 3.6 V, ISINK = +1.2 mA 0.3 4.5 V < VCC < 5.5 V, ISINK = 3.2 mA 0.4 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. © 2010 SCILLC. All rights reserved. Characteristics subject to change without notice 5 Doc. No. MD-3030, Rev. D CAT705, CAT706, CAT813 TYPICAL ELECTRICAL OPERATING CHARACTERISTICS TABLES Normalized Reset Threshold Voltage vs. Temperature VCC Supply Current vs. Temperature NORMALIZED RESET THRESHOLD (V) SUPPLY CURRENT (µA) 9 8 7 6 5 4 3 2 1 -40 -20 0 20 40 60 80 100 120 1.04 1.02 1.00 0.98 0.96 0.94 -40 -20 0 20 40 60 80 100 TEMPERATURE (ºC) TEMPERATURE (°C) TEMPERATURE (ºC) Doc. No. MD-3030 Rev. D 1.06 6 © 2010 SCILLC. All rights reserved. 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 output 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 © 2010 SCILLC. All rights reserved. Characteristics subject to change without notice 7 Doc. No. MD-3030, Rev. D CAT705, CAT706, CAT813 WATCHDOG TIMER The CAT705, CAT706, & CAT813 provide a Watchdog input (WDI). The watchdog timer function ¯¯¯¯ ) signal and forces controls the watchdog output (WDO ¯¯¯¯ to be low (active) when the WDI input does the WDO not have a transition from low-to-high or high-to-low within 1.6s typical. If a transition occurs on the WDI input pin prior to the watchdog time-out, the watchdog timer is restarted. The timing diagram is shown in Figure 3. The watchdog timer starts as soon as reset condition becomes inactive. 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 5). 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 th the last 1/8 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. When the VCC supply drops below the reset threshold, ¯¯¯¯ output becomes active and goes low the WDO independently of the watchdog timing stage. 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 4 below shows a typical implementation of a watchdog function. Any processor signal that repeats dependant on the normal operation of the processor tWP tWD tWD tWD +5 V WDI 0V +5 V WDO 0V +5 V RESET 0V RESET EXTERNALLY TRIGGERED BY MR tRS +5 V (RESET) 0V (() Are for CAT813 Only) Figure 3. Watchdog Timing Diagram WDO MR VCC GND PFI CAT705 CAT706 CAT813 PIC µC MCLR ADDRESS DECODER RESET/RESET WDI PFO Figure 4. Watchdog Timer Circuit Doc. No. MD-3030 Rev. D 8 © 2010 SCILLC. All rights reserved. Characteristics subject to change without notice CAT705, CAT706, CAT813 Tristate VCC WDO MR VCC GND CAT705 CAT706 CAT813 RESET/RESET µC WDI OUTPUT PFO PFI 150kΩ 110kΩ Figure 5. Watchdog Disable Circuit 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 © 2010 SCILLC. All rights reserved. Characteristics subject to change without notice 9 Doc. No. MD-3030, Rev. D 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 MR VCC GND WDO CAT705 CAT706 CAT813 PFI RESET/RESET RESET/RESET WDI 100kΩ PFO ¯¯¯¯¯¯ 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 NMI RESET/RESET WDI PFO I/O LINE INTERRUPT Figure 9. Typical Operating Circuit Doc. No. MD-3030 Rev. D 10 © 2010 SCILLC. All rights reserved. Characteristics subject to change without notice CAT705, CAT706, CAT813 PACKAGE OUTLINE DRAWINGS 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 Notes: (1) All dimensions are in millimeters. Angles in degrees. (2) Complies with JEDEC MO-187 © 2010 SCILLC. All rights reserved. Characteristics subject to change without notice 11 Doc. No. MD-3030, Rev. D CAT705, CAT706, CAT813 SOIC 8-Lead 150 mils (V) (1) (2) E1 E SYMBOL 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 Notes: (1) All dimensions are in millimeters. Angles in degrees. (2) Complies with JEDEC MS-012. Doc. No. MD-3030 Rev. D 12 © 2010 SCILLC. All rights reserved. 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 T3 Lead Finish G:NiPdAu 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 Device # Package Top Marking CAT705 MSOP ABRT CAT705 SOIC CAT705V CAT706 MSOP ABRT CAT706 SOIC CAT706 V CAT813 MSOP ABRS CAT813 SOIC CAT813V 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 2.63V 2.93V 3.08V 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. © 2010 SCILLC. All rights reserved. Characteristics subject to change without notice 13 Doc. No. MD-3030, Rev. D CAT705, CAT706, CAT813 REVISION HISTORY Date 21-Jan-08 Rev. A 3-Nov-08 B 27-Oct-09 C 06-July-10 D Description Initial Issue Change logo and fine print to ON Semiconductor Update Features Update Applications Update Description Update Block Diagram Update Recommended Operating Conditions Update Electrical Operating Characteristics Update Watchdog Timing Update Top Marking Information Update Electrical Operating Characteristics ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer's technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. 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This literature is subject to all applicable copyright laws and is not for resale in any manner. PUBLICATION ORDERING INFORMATION LITERATURE FULFILLMENT: Literature Distribution Center for ON Semiconductor P.O. Box 5163, Denver, Colorado 80217 USA Phone: 303-675-2175 or 800-344-3860 Toll Free USA/Canada Fax: 303-675-2176 or 800-344-3867 Toll Free USA/Canada Email: [email protected] Doc. No. MD-3030 Rev. D N. American Technical Support: 800-282-9855 Toll Free USA/Canada Europe, Middle East and Africa Technical Support: Phone: 421 33 790 2910 Japan Customer Focus Center: Phone: 81-3-5773-3850 14 ON Semiconductor Website: www.onsemi.com Order Literature: http://www.onsemi.com/orderlit For additional information, please contact your local Sales Representative © 2010 SCILLC. All rights reserved. Characteristics subject to change without notice