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SP705-708/813L Low Power Microprocessor Supervisory Circuits
s Precision Voltage Monitor: SP705/707/813L at 4.65V SP706/708 at 4.40V s RESET Pulse Width - 200ms s Independent Watchdog Timer - 1.6s Timeout (SP705/706/813L) s 60A Maximum Supply Current s Debounced TTL/CMOS Manual Reset Input s RESET Asserted Down to VCC = 1.1V s Voltage Monitor for Power Failure or Low Battery Warning s Available in 8-pin PDIP, NSOIC, and Now available in Lead Free SOIC packages s Pin Compatible Enhancement to Industry Standard 705-708/813L Series s Functionally Compatible to Industry Standard 1232 Series DESCRIPTION... The SP705-708/813L series is a family of microprocessor (P) supervisory circuits that integrate myriad components involved in discrete solutions which monitor power-supply and battery in P and digital systems. The SP705-708/813L series will significantly improve system reliability and operational efficiency when compared to solutions obtained with discrete components. The features of the SP705-708/813L series include a watchdog timer, a P reset, a Power Fail Comparator, and a manual-reset input. The SP705-708/813L series is ideal for applications in automotive systems, computers, controllers, and intelligent instruments. The SP705-708/813L series is an ideal solution for systems in which critical monitoring of the power supply to the P and related digital components is demanded.
Part Number
SP705 SP706 SP707 SP708 SP813L
RESET Threshold
4.65 V 4.40 V 4.65 V 4.40 V 4.65 V
RESET Active
LOW LOW LOW and HIGH LOW and HIGH HIGH
Manual RESET
YES YES YES YES YES
Watchdog
YES YES NO NO YES
PFI Accuracy
4% 4% 4% 4% 4%
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ABSOLUTE MAXIMUM RATINGS
This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability and cause permanent damage to the device. Vcc ....................................................................................... -0.3V to +6.0V All Other Inputs (Note 1) ......... -0.3V to (Vcc+0.3V) Input Current: Vcc ............................................................................................................. 20mA GND ............................................................ 20mA Output Current (all outputs) ......................... 20mA ESD Rating ..................................................... 4KV
Continuous Power Dissipation Plastic DIP (derate 9.09mW/C above +70C)727mW SO (derate 5.88mW/C above +70C) ...... 471mW Mini SO (derate 4.10mW/C above +70C) 330mW Storage Temperature Range ....... -65C to +160C Lead Temperature (soldering, 10s) ............ +300C
SPECIFICATIONS
VCC = 4.75V to 5.50V for SP705/707/813L, VCC = 4.50V to 5.50V for SP706/708, TA = TMIN to TMAX, unless otherwise noted, typical at 25oC.
PARAMETER Operating Voltage Range, VCC Supply Current, ISUPPLY Reset Threshold Reset Threshold Hysteresis Reset Pulse Width, tRS RESET Output Voltage
MIN. 1.1
TYP.
MAX. 5.5
UNITS V A V mV
CONDITIONS
40 4.50 4.25 140 VCC-1.5 0.8 4.65 4.40 40 200
60 4.75 4.50 280
MR=VCC or Floating, WDI Floating SP705, SP707, SP813L, Note 2 SP706, SP708, Note 2 Note 2 Note 2 Note 2 ISOURCE = 800A ISOURCE=4A, VCC=1.1V ISINK = 3.2mA Vcc = 1.1V, ISINK = 50 A SP705, SP706, SP813L VIL = 0.4V, VIH = 0.8XVCC SP705, SP706, SP813L VCC = 5V SP705, SP706, SP813L WDI = VCC SP705, SP706, SP813L WDI = 0V
ms
V 0.40 0.30
Watchdog Timeout Period, tWD WDI Pulse Width, tWP WDI Input Threshold, LOW HIGH WDI Input Current
1.00
1
1.60
2.25
s s
0.8 3.5 30 -75 -20 75
V A
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SPECIFICATIONS
VCC = 4.75V to 5.50V for SP705/707/813L,813M, VCC = 4.50V to 5.50V for SP706/708, TA = TMIN to TMAX, unless otherwise noted, typical at 25oC.
PARAMETER WDO Output Voltage MR Pull-Up Current MR Pulse Width, tMR MR Input Threshold LOW HIGH MR to Reset Out Delay, tMD PFI Input Threshold PFI Input Current PFO Output Voltage
MIN. VCC-1.5
TYP.
MAX. 0.40
UNITS V A ns
CONDITIONS ISOURCE=800A ISINK=3.2mA MR = 0V
100 150
250
600
0.8 2.0 250 1.20 -25.00 VCC-1.5 0.4 1.25 0.01 1.30 25.00
V ns V nA V ISOURCE = 800A ISINK = 3.2mA Note 2 VCC = 5V
Note 1: The input voltage limits on PFI and MR can be exceeded if the input current is less than 10mA. Note 2: Applies to both RESET in the SP705-SP708 and RESET in the SP707/708/813L/813M.
DIP and SOIC
SOIC
MR 1 VCC 2 GND 3 PFI 4 SP705 SP706 SP813L
8 WDO 7 RESET / RESET* 6 WDI
RESET / RESET* 1 WDO 2 MR 3 VCC 4 SP705 SP706 SP813L
8 WDI 7 PFO 6 PFI
5 PFO
5 GND
MR 1 VCC 2 GND 3 PFI 4 SP707 SP708
8 RESET 7 RESET 6 N.C.
RESET 1 RESET 2 MR 3 VCC 4 SP707 SP708
8 N.C. 7 PFO 6 PFI
5 PFO
5 GND
* SP813L only Figure 1. Pinouts
* SP813L only
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PIN DESCRIPTION NAME FUNCTION SP705/706
DIP/ SOIC SOIC
SP707/708
DIP/ SOIC SOIC
SP813L
DIP/ SOIC SOIC
MR
Manual Reset - This input triggers a reset pulse when pulled below 0.8V. This active-LOW input has an internal 250A pull-up current. It can be driven from a TTL or CMOS logic line or shorted to ground with a switch +5V power supply Ground reference for all signals Power-Fail Input - When this voltage monitor input is less than 1.25V, PFO goes LOW. Connect PFI to ground or VCC when not in use. Power-Fail Output - This output is HIGH until PFI is less than 1.25V. Watchdog Input - If this input remains HIGH or LOW for 1.6s, the internal watchdog timer times out and WDO goes LOW. Floating WDI or connecting WDI to a high-impedance tri-state buffer disables the watchdog feature. The internal watchdog timer clears whenever RESET is asserted, WDI is tri-stated, or whenever WDI sees a rising or falling edge. No Connect. Active-LOW RESET Output - This output pulses LOW for 200ms when triggered and stays LOW whenever VCC is below the reset threshold (4.65V for the SP705/707/813L and 4.40V for the SP706/708). It remains LOW for 200ms after Vcc rises above the reset threshold or MR goes from LOW to HIGH. A watchdog timeout will not trigger RESET unless WDO is connected to MR. Watchdog Output - This output pulls LOW when the internal watchdog timer finishes its 1.6s count and does not go HIGH again until the watchdog is cleared. WDO also goes LOW during low-line conditions. Whenever VCC is below the reset threshold, WDO stays LOW. However, unlike RESET, WDO does not have a minimum pulse width. As soon as VCC is above the reset threshold, WDO goes HIGH with no delay. Active-HIGH RESET Output - This output is the complement of RESET. Whenever RESET is HIGH, RESET is LOW, and vice versa. Note the SP813L/813M has a reset output only.
1
3
1
3
1
3
VCC GND PFI
2 3 4
4 5 6
2 3 4
4 5 6
2 3 4
4 5 6
PFO
5
7
5
7
5
7
WDI
6
8
-
-
6
8
N.C.
-
-
6
8
-
-
RESET
7
1
7
1
-
-
WDO
8
2
-
-
8
2
RESET
-
-
8
2
7
1
Table 1. Device Pin Description
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WDI VCC
WATCHDOG TRANSITION DETECTOR
WATCHDOG TIMER
WDO
250A MR
TIMEBASE FOR RESET AND WATCHDOG
RESET GENERATOR
RESET/RESET*
VCC
4.65V (4.40V for the SP706 and SP813M)
PFI PFO
1.25V
SP705 SP706 SP813L
GND * For the SP813L only
Figure 2. Internal Block Diagram for the SP705/706/813L
VCC RESET 250A MR
RESET GENERATOR
RESET
VCC
4.65V (4.40V for the SP708)
PFI PFO
1.25V
SP707 SP708
GND
Figure 3. Internal Block Diagram for the SP707/708
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+5V VCC = +5V TA = +25 C PFI PFO +1.25V 30pF 1K
Figure 4A. Power-Fail Comparator De-assertion Response Time.
Figure 4B. Circuit for the Power-Fail Comparator Deassertion Response Time.
+5V VCC = +5V TA = +25 C 1K PFI PFO 30pF
+1.25V
Figure 5A. Power-Fail Comparator Assertion Response Time.
Figure 5B. Circuit for the Power-Fail Comparator Assertion Response Time.
VCC TA = +25oC VCC 2K RESET RESET 330pF GND
Figure 6A. SP705/707 RESET Output Voltage vs. Supply Voltage. Figure 6B. Circuit for the SP705/707 RESET Output Voltage vs. Supply Voltage.
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VCC TA = +25oC VCC 10K RESET RESET 330pF GND
Figure 7A. SP705/707 RESET Response Time Figure 7B. Circuit for the SP705/707 RESET Response Time
Figure 8. SP707 RESET and RESET Assertion
Figure 9. SP707 RESET and RESET De-Assertion
VCC TA = +25oC VCC 10K RESET 330pF
RESET 330pF GND 10K
Figure 10. Circuit for the SP707 RESET and RESET Assertion and De-Assertion
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Figure 11. SP707/708/813L RESET Output Voltage vs. Supply Voltage
Figure 12. SP813L RESET Response Time
VCC VCC
RESET 330pF GND 10K
Figure 13. Circuit for the SP707/708/813L RESET Output Voltage vs. Supply Voltage and the SP813L RESET Response Time
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FEATURES The SP705-708/813L series provides four key functions: 1. A reset output during power-up, power-down and brownout conditions. 2. An independent watchdog output that goes LOW if the watchdog input has not been toggled within 1.6 seconds. 3. A 1.25V threshold detector for power-fail warning, low battery detection, or monitoring a power supply other than +5V. 4. An active-LOW manual-reset that allows RESET to be triggered by a pushbutton switch. The SP707/708 devices are the same as the SP705/706 devices except for the active-HIGH RESET substitution of the watchdog timer. The SP813L is the same as the SP705 except an active-HIGH RESET is provided rather than an active-LOW RESET. The SP705/707/813L devices generate a reset when the supply voltage drops below 4.65V. The SP706/708 devices generate a reset below 4.40V. The SP705-708/813L series is ideally suited for applications in automotive systems, intelligent instruments, and battery-powered computers and controllers. The SP705-708/813L series is ideally applied in environments where monitoring of power supply to a P and its related components is critical. THEORY OF OPERATION The SP705-708/813L series is a microprocessor (P) supervisory circuit that monitors the power supplied to digital circuits such as microprocessors, microcontrollers, or memory. The series is an ideal solution for portable, battery-powered equipment that requires power supply monitoring. Implementing this series will reduce the number of components and overall complexity. The watchdog functions of this product family will continuously oversee the operational status of a system. The operational features and benefits of the SP705-708/813L series are described in more detail below.
RESET Output A microprocessor's reset input starts the P in a known state. The SP705-708/813L series asserts reset during power-up and prevents code execution errors during powerdown or brownout conditions. On power-up, once VCC reaches 1.1V, RESET is a guaranteed logic LOW of 0.4V or less. As VCC rises, RESET stays LOW. When VCC rises above the reset threshold, an internal timer releases RESET after 200ms. RESET pulses LOW whenever VCC dips below the reset threshold, such as in a brownout condition. When a brownout condition occurs in the middle of a previously initiated reset pulse, the pulse continues for at least another 140ms. On powerdown, once VCC falls below the reset threshold, RESET stays LOW and is guaranteed to be 0.4V or less until VCC drops below 1.1V. The SP707/708/813L active-HIGH RESET output is simply the complement of the RESET output and is guaranteed to be valid with VCC down to 1.1V. Some Ps, such as Intel's 80C51, require an active-HIGH reset pulse. Watchdog Timer The SP705/706/813L watchdog circuit monitors the P's activity. If the P does not toggle the watchdog input (WDI) within 1.6 seconds and WDI is not tri-stated, WDO goes LOW. As long as RESET is asserted or the WDI input is tri-stated, the watchdog timer will stay cleared and will not count. As soon as RESET is released and WDI is driven HIGH or LOW, the timer will start counting. Pulses as short as 50ns can be detected.
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tWP tWD
+5V
tWD
WDI WDO RESET*
0V +5V 0V
tWD
+5V 0V
tRS
+5V
RESET*
0V
* externally triggered LOW by MR, RESET is for the SP813L only
Figure 14. SP705/706/813L Watchdog Timing Waveforms
Typically, WDO will be connected to the non-maskable interrupt input (NMI) of a P. When VCC drops below the reset threshold, WDO will go LOW whether or not the watchdog timer has timed out. Normally this would trigger an NMI but RESET goes LOW simultaneously, and thus overrides the NMI.
If WDI is left unconnected, WDO can be used as a low-line output. Since floating WDI disables the internal timer, WDO goes LOW only when VCC falls below the reset threshold, thus functioning as a low-line output.
+5V
VCC
VRT
VRT
0V
+5V
WDO
0V
tRS
+5V
tRS
RESET
0V +5V
MR*
0V
tMD *externally driven LOW tMR
Figure 15. SP705/706 Timing Diagrams with WDI Tri-stated. The SP707/708/813L RESET Output is the Inverse of the RESET Waveform Shown.
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Power-Fail Comparator The power-fail comparator can be used for various purposes because its output and noninverting input are not internally connected. The inverting input is internally connected to a 1.25V reference. To build an early-warning circuit for power failure, connect the PFI pin to a voltage divider as shown in Figure 16. Choose the voltage divider ratio so that the voltage at PFI falls below 1.25V just before the +5V regulator drops out. Use PFO to interrupt the P so it can prepare for an orderly power-down. Manual Reset The manual-reset input (MR) allows RESET to be triggered by a pushbutton switch. The switch is effectively debounced by the 140ms minimum RESET pulse width. MR is TTL/CMOS logic compatible, so it can be driven by an external logic line. MR can be used to force a watchdog timeout to generate a RESET pulse in the SP705/706/813L. Simply connect WDO to MR.
Ensuring a Valid RESET Output Down to VCC = 0V When VCC falls below 1.1V, the SP705/706/707/ 708 RESET output no longer sinks current, it becomes an open circuit. High-impedance CMOS logic inputs can drift to undetermined voltages if left undriven. If a pull-down resistor is added to the RESET pin, any stray charge or leakage currents will be shunted to ground, holding RESET LOW. The resistor value is not critical. It should be about 100K, large enough not to load RESET and small enough to pull RESET to ground. Monitoring Voltages Other Than the Unregulated DC Input Monitor voltages other than the unregulated DC by connecting a voltage divider to PFI and adjusting the ratio appropriately. If required, add hysteresis by connecting a resistor (with a value approximately 10 times the sum of the two resistors in the potential divider network) between PFI and PFO. A capacitor between PFI and GND will reduce the power-fail circuit's
Regulated +5V Power Supply Unregulated DC Power Supply VCC P RESET INTERRUPT I/O LINE NMI GND 0.1F VCC RESET PFO PFI WDO
SP705 SP706 SP813L
+5V VCC
+12V 1M 1% PFI 130K 1%
R1 PFI R2 MR
MR PFO to P RESET GND
GND
PUSHBUTTON SWITCH
Figure 16. Typical Operating Circuit
Figure 17. Monitoring Both +5V and +12V Power Supplies
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sensitivity to high-frequency noise on the line being monitored. RESET can be used to monitor voltages other than the +5V V CC line. Connect PFO to MR to initiate a RESET pulse when PFI drops below 1.25V. Figure 17 shows the SP705/706/707/708 configured to assert RESET when the +5V supply falls below the RESET threshold, or when the +12V supply falls below approximately 11V. Monitoring a Negative Voltage Supply The power-fail comparator can also monitor a negative supply rail, shown in Figure 18. When the negative rail is good (a negative voltage of large magnitude), PFO is LOW. By adding the resistors and transistor as shown, a HIGH PFO triggers RESET. As long as PFO remains HIGH, the SP705-708/813L will keep RESET asserted (where RESET = LOW and RESET = HIGH). Note that this circuit's accuracy depends on the PFI threshold tolerance, the VCC line, and the resistors.
Interfacing to mPs with Bidirectional RESET Pins Ps with bidirectional RESET pins, such as the Motorola 68HC11 series, can contend with the SP705/706/707/708 RESET output. If, for example, the RESET output is driven HIGH and the P wants to pull it LOW, indeterminate logic levels may result. To correct this, connect a 4.7K resistor between the RESET output and the P reset I/O, as shown if Figure 19. Buffer the RESET output to other system components.
+5V
100K 10K
2N3904 to P
VCC MR PFO PFI
R1
Buffered RESET connects to System Components
R2 V-
100K 10K
RESET GND
+5V VCC
+5V VCC P RESET RESET 4.7K
R1 = 5.0 - 1.25 , VTRIP < 0 1.25 - VTRIP R2
+5V MR 0V +5V PFO 0V VVTRIP 0V V-
GND
GND
Figure 18. Monitoring a Negative Voltage Supply
Figure 19. Interfacing to Microprocessors with Bidirectional RESET I/O for the SP705/706/707/708
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45 44 43 42 4.75V 5.0V 5.5V
45 44 43 42 -40C 25C +85C
Isupply (A)
41 40 39 38 37 36 35 -40C
Isupply (A)
41 40 39 38 37 36
25C Centigrade Temperature
+85C
35 4.75V
5.0V VCC
5.5V
Figure 20. Supply Current vs. Temperature
Figure 21. Supply Current vs. Supply Voltage
Applications The SP705-708/813L series offers unmatched performance and the lowest power consumption for these industry standard devices. Refer to Figures 20 and 21 for supply current performance characteristics rated against temperature and supply voltages. Table 2 shows how the SP705-708/813L series can be used instead of the Dallas Semiconductor DS1232LP/LPS. Table 2 illustrates to a designer the advantages and tradeoffs of the SP705-708/813L series compared to the Dallas Semiconductor device. While the names of the pin descriptions may differ, the functions are the same or very similar.
Unlike the DS1232, the SP705-708/813L series has a separate watchdog output pin WDO which can be simply connected to the MR input to generate a Reset signal. The DS1232 has pin selectable features, while the SP705-708/813L series has more fixed functions of reset threshold and watchdog time-out delay. For most applications, the fixed functions will be preferred, with the benefit of reduced cost due to a less complex part. In addition, the SP705-708/ 813L series has a power fail input and output function not available with the DS1232 that is useful for monitoring systems with unregulated supply voltages. The SP705-708/ 813L series is available in one of the industry's smallest space-saving package sizes, the SOIC.
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Dallas DS1232LP/LPS Function Pin Number DIP or SOIC 1 2 3 3 4 5 5 6 7 8 N/A N/A N/A Pin Description
Sipex Alternative Part Number Pin Number Sipex Part Number SP705-708/ 813L/813M SP705-708/ 813L/813M SP705/707/ 813L SP706/708/ 813M SP705-708/ 813L/813M SP707/708 SP813L/813M SP705-708 SP705/706/ 813L/813M SP705-708/ 813L/813M SP705-708/ 813L/813M SP705-708/ 813L/813M SP705/706/ 813L/813M DIP or SOIC 1 N/A N/A N/A 3 8 7 7 6 2 4 5 8 Pin Description SOIC
Manual Reset WDI Time Delay Set VCC Trip 4.6V VCC Trip 4.4V Ground Reset Active HIGH Reset Active HIGH Reset Active LOW Watchdog Input Voltage Input Power Fail Input Power Fail Output Watchdog Output
PBRST TD TOL=GND TOL=VCC GND R ST R ST R ST ST (H to L) VCC N/A N/A N/A
3 N/ A N/ A N/A 5 2 1 1 8 4 6 7 2
MR 1.6sec by design 4.6V by design 4.4V by design GND RESET RESET RESET WDI (any trans.) VCC P FI PFO WDO
Table 2. Device Overview on Dallas Semiconductor
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ORDERING INFORMATION
Model ....................................................................................... Temperature Range ................................................................................ Package SP705CP .....................................................................................DISCONTINUED SP705CN ....................................................................................... 0C to +70C ..................................................................... 8-pin Narrow SOIC SP705CU ....................................................................................... 0C to +70C ................................................................................. 8-pin SOIC SP705EP ......................................................................................DISCONTINUED SP705EN ..................................................................................... -40C to +85C ................................................................... 8-pin Narrow SOIC SP705EU ..................................................................................... -40C to +85C ............................................................................... 8-pin SOIC SP706CP .....................................................................................DISCONTINUED SP706CN ....................................................................................... 0C to +70C ..................................................................... 8-pin Narrow SOIC SP706CU ....................................................................................... 0C to +70C ................................................................................. 8-pin SOIC SP706EP ......................................................................................DISCONTINUED SP706EN ..................................................................................... -40C to +85C ................................................................... 8-pin Narrow SOIC SP706EU ..................................................................................... -40C to +85C ............................................................................... 8-pin SOIC SP707CP .....................................................................................DISCONTINUED SP707CN ....................................................................................... 0C to +70C ..................................................................... 8-pin Narrow SOIC SP707CU ....................................................................................... 0C to +70C ................................................................................. 8-pin SOIC SP707EP ......................................................................................DISCONTINUED SP707EN ..................................................................................... -40C to +85C ................................................................... 8-pin Narrow SOIC SP707EU ..................................................................................... -40C to +85C ............................................................................... 8-pin SOIC SP708CP .....................................................................................DISCONTINUED SP708CN ....................................................................................... 0C to +70C ..................................................................... 8-pin Narrow SOIC SP708CU ....................................................................................... 0C to +70C ................................................................................. 8-pin SOIC SP708EP ......................................................................................DISCONTINUED SP708EN ..................................................................................... -40C to +85C ................................................................... 8-pin Narrow SOIC SP708EU ..................................................................................... -40C to +85C ............................................................................... 8-pin SOIC SP813LCP ..................................................................................... 0C to +70C ......................................................................... 8-pin Plastic DIP SP813LCN ....................................................................................DISCONTINUED SP813LCU ..................................................................................... 0C to +70C ................................................................................. 8-pin SOIC SP813LEP .................................................................................... -40C to +85C ....................................................................... 8-pin Plastic DIP SP813LEN ....................................................................................DISCONTINUED SP813LEU ................................................................................... -40C to +85C ............................................................................... 8-pin SOIC SP813MCP ...................................................................................DISCONTINUED SP813MCN ...................................................................................DISCONTINUED SP813MCU ...................................................................................DISCONTINUED SP813MEP ....................................................................................DISCONTINUED SP813MEN .................................................................................. DISCONTINUED SP813MEU .................................................................................. DISCONTINUED Please consult the factory for pricing and availability on a Tape-On-Reel option. All parts available lead free and in tape & reel: Example SP708CU-L/TR
For further assistance: Email: EXAR Technical Documentation: customersupport@exar.com http://www.exar.com/TechDoc/default.aspx? Exar Corporation Headquarters and Sales Office 48720 Kato Road Fremont, CA 94538 main: 510-668-7000 fax: 510-668-7030 EXAR Corporation reserves the right to make changes to the products contained in this publication in order to improve design, performance or reliability. EXAR Corporation assumes no responsibility for the use of any circuits described herein, conveys no license under any patent or other right, and makes no representation that the circuits are free of patent infringement. Charts and schedules contained here in are only for illustration purposes and may vary depending upon a user's specific application. While the information in this publication has been carefully checked; no responsibility, however, is assumed for inaccuracies. EXAR Corporation does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. Products are not authorized for use in such applications unless EXAR Corporation receives, in writing, assurances to its satisfaction that: (a) the risk of injury or damage has been minimized; (b) the user assumes all such risks; (c) potential liability of EXAR Corporation is adequately protected under the circumstances.
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