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CAT705, CAT706, CAT813
P Supervisory Circuits
FEATURES
Accurate under voltage system monitoring RESET guaranteed valid for VCC = 1.0V 6A 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 -40C to +85C 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 P 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
(c) Catalyst Semiconductor, Inc. Characteristics subject to change without notice
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Doc. No. MD-3030, Rev. A
CAT705, CAT706, CAT813
BLOCK DIAGRAM
VCC 250A MR
VCC RESET CONTROLLER RESET (RESET for CAT813)
4.65/4.40V
TIMER
WDI
52k 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
(c) 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 = +70C) SOIC 8-lead (derate 5.9mW/C above +70C) MSOP 8-lead (derate 4.1mW/C above +70C) Storage Temperature Lead Soldering (10 seconds max) ESD Rating: Human Body Model ESD Rating: Machine Model RECOMMENDED OPERATING CONDITIONS Parameter VCC (TA = -40C to +85C) All Other Pins Ambient Temperature Range 1.2 to 5.5 -0.1 to (VCC + 0.1) -40 to +85 Units V V C 471 330 -65 to 150 +300 2000 200 C C 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.
(c) Catalyst Semiconductor, Inc. Characteristics subject to change without notice
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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, -40C TA +85C unless otherwise noted. Typical values at TA = 25C 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 -40C TA +85C CAT706 at -40C TA +85C CAT706T at -40C TA +85C CAT706S at -40C TA +85C CAT706R at -40C TA +85C 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 = -120A CAT705 & CAT706, VCC = VRST max, ISOURCE = -30A CAT705 & CAT706, VCC = VRST min, ISINK = 3.2mA CAT705 &CAT706, VCC = 1.2V ISINK = 100A CAT813, VCC = VRST max, ISOURCE = -120A CAT813, VCC = VRST max, ISOURCE = -30A CAT813, VCC = VRST min, ISINK = 3.2mA CAT813, VCC = 1.2V ISINK = 100A 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 A A V V V V V ppm/C mV mV s
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
(c) 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, -40C TA +85C unless otherwise noted. Typical values at TA = 25C 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 = -800A 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 = -800A 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 A 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 A s s 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 10A 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 200A when active. (5) RESET for CAT705 & CAT706 & RESET for CAT813.
(c) 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 (C)
9 8 SUPPLY CURRENT (A 7 6 5 4 3 2 1 -40 -20
0
20
40
60
80 100 120
TEMPERATURE (C)
Doc. No. MD-3030 Rev. A
6
(c) 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 52k 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
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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 C MCLR ADDRESS DECODER
CAT705 CAT706 CAT813
Figure 3. Watchdog Timer
VCC MR VCC GND PFI WDO RESET/RESET WDI PFO Tristate
CAT705 CAT706 CAT813
150k
C
OUTPUT
110k
Figure 4. Watchdog Disable Circuit
Doc. No. MD-3030 Rev. A
8
(c) 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
(c) Catalyst Semiconductor, Inc. Characteristics subject to change without notice
Doc. No. MD-3030, Rev. A
CAT705, CAT706, CAT813
APPLICATION NOTES
P'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 800A) 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 2s 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 100k should be adequate in most situations to maintain a low condition valid output down to VCC equal to 1.0V.
C MR VCC GND PFI WDO RESET/RESET WDI
CAT705 CAT706 CAT813
RESET/RESET
100k
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 C
CAT705 CAT706 CAT813
Figure 9. Typical Operating Circuit
Doc. No. MD-3030 Rev. A
10
(c) 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 0 6 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
TOP VIEW
D
A
A2
DETAIL A
A1
e SIDE VIEW
b
c END VIEW
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
(c) Catalyst Semiconductor, Inc. Characteristics subject to change without notice
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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 0
1.75 0.25 0.51 0.25 5.00 6.20 4.00 0.50 1.27 8
D E E1 e h L
PIN # 1 IDENTIFICATION TOP VIEW
D
h
A1
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
(c) 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 (-40C to 85C)
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.
(c) 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 (c) Catalyst Semiconductor, Inc. Trademarks and registered trademarks of Catalyst Semiconductor include each of the following: Adaptive AnalogTM, Beyond MemoryTM, DPPTM, EZDimTM, LDDTM, MiniPotTM, Quad-ModeTM and Quantum Charge ProgrammableTM 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

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