CAT705, CAT706, CAT813 mP Supervisory Circuits 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 devices have a watchdog input which can be used to monitor a system signal and causes WDO to go low if the signal fails to change state prior to a timeout condition. The supervisory circuits provide a MR input which initiates a reset if pulled low. The CAT705 and CAT706 provide an active low RESET output. The CAT813 provides an active high RESET output. There is a secondary supply monitor (PFI) included for power−fail warning. http://onsemi.com SOIC−8 V SUFFIX CASE 751BD PIN CONFIGURATIONS AND MARKING DIAGRAMS Features • • • Reset Guaranteed Valid for 1.0 V VCC 6 mA Supply Current 200 ms Reset Pulse Width Watchdog Timer Function 1.6 s Timeout Accurate Brownout Detection Reset in 3.0, 3.6, and 5.0 Volt Systems Secondary Low Supply Monitoring on PFI Input Pin and Function Compatible with the MAX705/MAX706/MAX813L Products Operating Range from −40°C to +85°C SOIC 8−lead and MSOP 8−lead Packages These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS Compliant SOIC−8 (V) (Top View) 1 WDO MR VCC GND PFI L4A CAT705VI YMALND • • • • • • • MSOP−8 Z SUFFIX CASE 846AD RESET * WDI PFO L = Assembly Location Code 4 = Lead Finish NiPdAu A = Product Revision: Fixed as “A” CATxxxV = Specific Device Code = (CAT705V = CAT705 SOIC) = (CAT706V = CAT706 SOIC) = (CAT813V = CAT813 SOIC) I = Temperature Range (I = Industrial) Y = Production Year (Last Digit) M = Production Month (1−9, O, N, D) ALND = Last Four Assembly Lot Number Digits Typical Applications MSOP−8 (Z) (Top View) 1 RESET * WDO MR VCC ABRx Y M Z ABRx YMZ • Microprocessor and Microcontroller Based Systems • Instrument and Control Systems • Portable Equipment WDI PFO PFI GND = Specific Device Code = (ABRT = CAT705 MSOP) = (ABRT = CAT706 MSOP) = (ABRS = CAT813 MSOP) = Production Year (Last Digit) = Production Month (1−9, O, N, D) = Product Revision (* RESET for CAT813) ORDERING INFORMATION See detailed ordering and shipping information in the package dimensions section on page 12 of this data sheet. © Semiconductor Components Industries, LLC, 2012 April, 2012 − Rev. 7 1 Publication Order Number: CAT705/D CAT705, CAT706, CAT813 VCC RMR = 60 kW MR VCC RESET CONTROLLER + RESET (RESET for CAT813) − VRST WDI PFI TIMER 52kW WATCHDOG TRANSITION DETECTION WATCHDOG TIMER WDO + PFO − 1.25 V Figure 1. Functional Block Diagram Device RESET CAT705 CAT706 CAT813 RESET MR WDI WDO PFI @ 4.65 V x x x @ 1.25 V x x x x @ 1.25 V x x x @ 1.25 V @ 4.65 V http://onsemi.com 2 CAT705, CAT706, CAT813 Table 1. PIN FUNCTION DESCRIPTION Pin Name Function MR Manual Reset Input VCC Power Supply GND Ground PFI 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 Table 2. ABSOLUTE MAXIMUM RATINGS Parameters Ratings Units 6.5 V −0.3 to (VCC + 0.3) V Output Current RESET, RESET, WDO 20 mA Continuous Power Dissipations (TA = +70°C) SOIC 8−lead (derate 5.9 mW/°C above +70°C) MSOP 8−lead (derate 4.1 mW/°C above +70°C) 471 330 Supply Voltage All other pins Storage Temperature mW −65 to 150 °C Lead Soldering (10 seconds max) +300 °C ESD Rating: Human Body Model 2000 V ESD Rating: Machine Model 200 V Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability. Table 3. RECOMMENDED OPERATING CONDITIONS Parameter VCC (TA = −40°C to +85°C) All Other Pins Ambient Temperature http://onsemi.com 3 Rating Unit 1.0 to 5.5 V −0.1 to (VCC + 0.1) V −40 to +85 °C CAT705, CAT706, CAT813 Table 4. ELECTRICAL OPERATING CHARACTERISTICS (Typical values at TA = 25°C and VCC = 5 V for CAT705, CAT706 and CAT813 versions. VCC = 3.3 V for the CAT706 T/S versions; VCC = 3.0 V for the CAT706 R version.) (Note 1) Parameter Supply Current Reset Threshold Symbol ICC VRST Typ Max Units CAT705, CAT706, CAT813 Test Conditions Min 6 17 mA CAT706 (R/S/T Versions) 4 12 mA CAT705 & CAT813 at −40°C ≤ TA ≤ +85°C 4.50 4.65 4.75 V CAT706 at −40°C ≤ TA ≤ +85°C 4.25 4.40 4.50 V CAT706T at −40°C ≤ TA ≤ +85°C 3.00 3.08 3.15 V CAT706S at −40°C ≤ TA ≤ +85°C 2.85 2.93 3.00 V CAT706R at −40°C ≤ TA ≤ +85°C 2.55 2.63 2.70 V Reset Threshold Tempco (Note 1) Reset Threshold Hysteresis (Note 1) VCC to Reset Delay (Note 2) tRD Reset Active Timeout Period tRP RESET Output High Voltage VOH 40 ppm/°C CAT705 & CAT813 10 mV CAT706 5 mV VCC = VTH to (VTH – 100 mV) 20 ms 140 CAT705 & CAT706, 4.5 V < VCC < 5.5 V, ISOURCE = −800 mA CAT705 & CAT706, VRST (max) < VCC < 3.6 V, ISOURCE = −500 mA RESET Output Low Voltage RESET Output High Voltage RESET Output Low Voltage VOL VOH VOL 200 400 ms V VCC − 1.5 V 0.8 x VCC CAT705 & CAT706, 4.5 V < VCC < 5.5 V, ISINK = 3.2 mA 0.4 CAT705 & CAT706, VRST (max) < VCC < 3.6 V, ISINK = 1.2 mA 0.3 CAT705 &CAT706, VCC = 1 V, ISINK = 100 mA 0.3 CAT813, VCC = VRST max, ISOURCE = −120 mA VCC − 1.5 V CAT813, VCC = VRST max, ISOURCE = −30 mA 0.8 x VCC V V CAT813, VCC = VRST min, ISINK = 3.2 mA 0.4 CAT813, VCC = 1.2 V, ISINK = 100 mA 0.3 V WATCHDOG INPUT Watchdog Timeout Period tWD WDI Pulse Width tWP WDI Input Voltage (Note 3) 1.00 VIL = 0.4 V, VIH = 0.8 x VCC s ns 0.3 x VCC V 150 mA 0.7 x VCC WDI = VCC, Time Average WDI = 0 V, Time Average 1. 2. 3. 4. 5. 2.25 50 VIL VIH WDI Input Current (Note 3) 1.6 50 −150 −50 Limits are guaranteed by design and not production tested. The RESET short−circuit current is the maximum pull−up current when reset is driven low by a bidirectional output. WDI is internally serviced within the watchdog period if WDI is left open. RESET for CAT705 & CAT706 & RESET for CAT813. Not 100% tested but guaranteed by design. http://onsemi.com 4 CAT705, CAT706, CAT813 Table 4. ELECTRICAL OPERATING CHARACTERISTICS (Typical values at TA = 25°C and VCC = 5 V for CAT705, CAT706 and CAT813 versions. VCC = 3.3 V for the CAT706 T/S versions; VCC = 3.0 V for the CAT706 R version.) (Note 1) Parameter Symbol Test Conditions Min VW_OH VRST (max) < VCC < 3.6 V; ISOURCE = −500 mA 0.8 x VCC 4.5 V < VCC < 5.5 V, ISOURCE = −800 mA VCC – 1.5 Typ Max Units WATCHDOG INPUT WDO Output Voltage VW_OL VCC – 0.25 VRST (max) < VCC < 3.6 V, ISINK = +500 mA 0.3 4.5 V < VCC < 5.5 V, ISINK = 1.2 mA WDO to WDI setup time (Note 5) V tWDSU 0.1 0.4 250 ns MANUAL RESET INPUT MR Input Voltage VIH MR Pull−up Current MR Pulse Width 0.3 x VCC V 70 140 mA 60 80 kW 5 ms VIL 0.7 x VCC MR = 0 V 40 tPB 1 MR Pull−up Resistance RMR 40 MR low to Reset Delay (Note 4) tPDLY ms POWER−FAIL INPUT PFI Input Threshold VCC = 5 V PFI Input Current PFO Output Voltage VP_OH VRST(max) < VCC < 3.6 V, ISOURCE = −500 mA 4.5 V < VCC < 5.5 V, ISOURCE = −800 mA VP_OL 1. 2. 3. 4. 5. 1.2 1.25 1.3 V −25 0.01 25 nA V 0.8 x VCC VCC − 1.5 0.4 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 Limits are guaranteed by design and not production tested. The RESET short−circuit current is the maximum pull−up current when reset is driven low by a bidirectional output. WDI is internally serviced within the watchdog period if WDI is left open. RESET for CAT705 & CAT706 & RESET for CAT813. Not 100% tested but guaranteed by design. http://onsemi.com 5 CAT705, CAT706, CAT813 TYPICAL PERFORMANCE CHARACTERISTICS NORMALIZED RESET THRESHOLD (V) 9 SUPPLY CURRENT (mA) 8 7 6 5 4 3 2 1 −40 −20 0 20 40 60 80 100 120 1.06 1.04 1.02 1.00 0.98 0.96 0.94 −40 −20 0 20 40 60 80 100 TEMPERATURE (°C) TEMPERATURE (°C) Figure 2. VCC Supply Current vs. Temperature Figure 3. Normalized Reset Threshold Voltage vs. Temperature FUNCTIONAL DESCRIPTION Processor Reset Manual 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 140 ms 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. The CAT705, CAT706 & CAT813 each have a Manual Reset (MR) input to allow for alternative control of the reset outputs. The MR input is designed for direct connection to a pushbutton (see Figure 4). The MR input is internally pulled up by 60 kW resistor and must be pulled low to cause the reset output to go active. Internally, this input is debounced and timed such that RESET (or RESET) signals of at least 140 ms minimum will be generated. The min 140 ms tRP delay commences as the Manual Reset input is released from the low level. (see Figure 5). MR VCC GND PFI WDO CAT705 CAT706 CAT813 RESET/RESET WDI PFO Figure 4. Pushbutton RESET tPB MR tPDLY VIH VIL tRP RESET VOH VOL RESET Figure 5. Timing Diagram – Pushbutton RESET http://onsemi.com 6 CAT705, CAT706, CAT813 WATCHDOG TIMER The CAT705, CAT706, & CAT813 provide a Watchdog input (WDI). The watchdog timer function controls the watchdog output (WDO) signal and forces the WDO to be low (active) when the WDI input does not have a transition from low−to−high or high−to−low within 1.6 s 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 6. The watchdog timer starts as soon as reset condition becomes inactive. When the VCC supply drops below the reset threshold, the WDO output becomes active and goes low independently of the watchdog timing stage. Figure 7 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 tri−stating) the WDI input (see Figure 8). If the watchdog is disabled the WDI pin will be pulled low for the first 7/8th’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. tWDSU tWP tWD WDI WDO RESET (RESET) tWD tWD +5 V 0V +5 V 0V +5 V 0V RESET EXTERNALLY TRIGGERED BY MR +5 V tRS 0V (() Are for CAT813 Only) Figure 6. Watchdog Timing Diagram MR WDO VCC GND PFI PIC mC MCLR ADDRESS RESET/RESET CAT705 CAT706 CAT813 WDI PFO Figure 7. Watchdog Timer Circuit http://onsemi.com 7 DECODER CAT705, CAT706, CAT813 VCC MR VCC GND Tristate WDO CAT705 CAT706 CAT813 RESET/RESET WDI OUTPUT PFO PFI mC 150 kW 110 kW Figure 8. Watchdog Disable Circuit VCC VRST(MAX) VRST VRST(MIN) tRD RESET (CAT705 & CAT706) VOH RESET Slews with VCC VOL RESET (CAT813) Figure 9. Timing Diagram – Power Down VRST(MAX) VRST VRST(MIN) VCC tRP RESET (CAT705 & CAT706) VOH VOL Figure 10. Timing Diagram – Power Up http://onsemi.com 8 RESET (CAT813) CAT705, CAT706, CAT813 APPLICATION NOTES mP’s with Bidirectional Reset Pins These issues can usually be remedied by the proper location of bypass capacitance on the circuit board. 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 1.5 mA (and by the CAT706 T/R/S is 800 mA) allowing the processor to pull the output low even when the CAT70x is pulling it high. 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 0.8 V a resistor can be connected from RESET to Ground (see Figure 11.) 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 100 kW should be adequate in most situations to maintain a low condition valid output down to VCC equal to 1.0 V. Power Transients Generally short duration negative−going transients of less than 2 ms 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. mC MR VCC GND WDO RESET/RESET CAT705 CAT706 CAT813 RESET/RESET WDI 100 kW PFO PFI Figure 11. RESET Valid for VCC < 1.0 V 5V Push Switch WDO MR UNREGULATED DC VCC GND CAT705 CAT706 CAT813 PFI RESET/RESET WDI PFO Figure 12. Typical Operating Circuit http://onsemi.com 9 VCC mC NMI RESET/RESET I/O LINE INTERRUPT CAT705, CAT706, CAT813 PACKAGE DIMENSIONS SOIC 8, 150 mils CASE 751BD−01 ISSUE O E1 E SYMBOL MIN A 1.35 1.75 A1 0.10 0.25 b 0.33 0.51 MAX 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 END VIEW SIDE VIEW Notes: (1) All dimensions are in millimeters. Angles in degrees. (2) Complies with JEDEC MS-012. http://onsemi.com 10 CAT705, CAT706, CAT813 PACKAGE DIMENSIONS MSOP 8, 3x3 CASE 846AD−01 ISSUE O SYMBOL MIN NOM MAX A E 1.10 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 E1 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 q L2 Notes: (1) All dimensions are in millimeters. Angles in degrees. (2) Complies with JEDEC MO-187. L L1 DETAIL A http://onsemi.com 11 CAT705, CAT706, CAT813 Example of Ordering Information (Notes 6 − 8) Order Number CAT705VI−GT3 CAT705ZI−GT3 CAT706RVI−GT3 CAT706RZI−GT3 CAT706SVI−GT3 CAT706SZI−GT3 CAT706TVI−GT3 CAT706TZI−GT3 CAT706VI−GT3 CAT706ZI−GT3 CAT813VI−GT3 CAT813ZI−GT3 6. 7. 8. 9. Voltage 4.65 2.63 2.93 3.08 4.40 4.65 Top Mark Manual Reset Reset Output Yes LOW Yes LOW Yes LOW Yes LOW Yes LOW Yes HIGH CAT705V ABRT CAT706V ABRT CAT706V ABRT CAT706V ABRT CAT706V ABRT CAT813V ABRS Package Quantity per Reel (Note 9) SOIC−8 MSOP−8 SOIC−8 MSOP−8 SOIC−8 MSOP−8 SOIC−8 3,000 MSOP−8 SOIC−8 MSOP−8 SOIC−8 MSOP−8 All packages are RoHS−compliant (Lead−free, Halogen−free). The standard lead finish is NiPdAu. Contact factory for package availability. For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D. 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