SP813LEN-L/TR - Sipex Corporation

SP705-708/813L/813M

Low Power Microprocessor Supervisory Circuits

■Precision Voltage Monitor:

SP705/707/813L at 4.65V

SP706/708/813M at 4.40V

■RESET Pulse Width - 200ms

■Independent Watchdog Timer - 1.6s

Timeout (SP705/706/813L/813M)

■60µA Maximum Supply Current

■Debounced TTL/CMOS Manual Reset Input

■RESET Asserted Down to VCC = 1V

■Voltage Monitor for Power Failure or Low

Battery Warning

■Available in 8-pin PDIP, NSOIC, and

µSOIC packages

■Pin Compatible Enhancement to Industry Standard 705-708/813L Series

■Functionally Compatible to Industry Standard 1232 Series

DESCRIPTION…

The SP705-708/813L/813M series is a family of microprocessor (µP) supervisory circuits that

integrate myriad components involved in discrete solutions which monitor power-supply and

battery in µP and digital systems. The SP705-708/813L/813M series will significantly improve

system reliability and operational efficiency when compared to solutions obtained with discrete

components. The features of the SP705-708/813L/813M series include a watchdog timer,

a µP reset, a Power Fail Comparator, and a manual-reset input. The SP705-708/813L/813M

series is ideal for applications in automotive systems, computers, controllers, and intelligent

instruments. The SP705-708/813L/813M series is an ideal solution for systems in which critical

monitoring of the power supply to the µP and related digital components is demanded.

Part RESET RESET Manual PFI

Number Threshold Active RESET Watchdog Accuracy

SP705 4.65 V LOW YES YES 4%

SP706 4.40 V LOW YES YES 4%

SP707 4.65 V LOW and HIGH YES NO 4%

SP708 4.40 V LOW and HIGH YES NO 4%

SP813L 4.65 V HIGH YES YES 4%

SP813M 4.40V HIGH YES YES 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 +70°C)727mW

SO (derate 5.88mW/°C above +70°C) ...... 471mW

Mini SO (derate 4.10mW/°C above +70°C) 330mW

Storage Temperature Range ....... -65°C to +160°C

Lead Temperature (soldering, 10s)............ +300°C

SPECIFICATIONS

VCC = 4.75V to 5.50V for SP705/707/813L, VCC = 4.50V to 5.50V for SP706/708/813M, TA = TMIN to TMAX, unless otherwise noted, typical at 25oC.

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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.

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.

SP705

SP706

SP813L

SP813M

GND

PFI

WDO

RESET / RESET*

WDI

PFO

SP707

SP708

GND

PFI

RESET

N.C.

PFO

SP705

SP706

SP813L

SP813M

WDO

WDI

PFO

PFI

GND

SP707

SP708

RESET

N.C.

PFO

PFI

GND

RESET / RESET*

DIP and SOIC µSOIC

Figure 1. Pinouts

* SP813L/M only

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Table 1. Device Pin Description

1.25V

4.65V

(4.40V for the SP708)

RESET

GENERATOR

250µA

RESET

SP707

SP708

PFI PFO

GND

RESET

Figure 3. Internal Block Diagram for the SP707/708

Figure 2. Internal Block Diagram for the SP705/706/813L/813M

SP705

SP706

SP813L

SP813M

GND * For the SP813L/813M only

1.25V

4.65V

(4.40V for the SP706 and SP813M)

TIMEBASE FOR

RESET AND

WATCHDOG

TIMER

RESET

GENERATOR

WATCHDOG

TRANSITION

DETECTOR

250µA

RESET/RESET*

WDO

PFI PFO

WDI

Figure 4A. Power-Fail Comparator De-assertion

Response Time.

30pF 1KΩ

PFO

+1.25V

+5V

PFI

= +5V

= +25 C

Figure 4B. Circuit for the Power-Fail Comparator De-

assertion Response Time.

Figure 5A. Power-Fail Comparator Assertion Response

Time. Figure 5B. Circuit for the Power-Fail Comparator

Assertion Response Time.

Figure 6A. SP705/707 RESET Output Voltage vs.

Supply Voltage. Figure 6B. Circuit for the SP705/707 RESET Output

Voltage vs. Supply Voltage.

30pF

1KΩ

PFO

+1.25V

+5V

PFI

= +5V

= +25 C

330pF

2KΩ

= +25oC

RESET RESET

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

Figure 10. Circuit for the SP707 RESET and RESET Assertion and De-Assertion

330pF

10KΩ

= +25oC

RESET RESET

GND

330pF

= +25

10KΩ

RESET

330pF 10KΩ

GND

Figure 11. SP707/708/813L/813M RESET Output

Voltage vs. Supply Voltage Figure 12. SP813L/813M RESET Response Time

Figure 13. Circuit for the SP707/708/813L/813M RESET Output Voltage vs. Supply Voltage and the SP813L/813M

RESET Response Time

GND

RESET

330pF

10KΩ

FEATURES

The SP705-708/813L/813M 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 SP706/708/813M

devices generate a reset below 4.40V.

The SP705-708/813L/813M series is ideally

suited for applications in automotive systems,

intelligent instruments, and battery-powered

computers and controllers. The SP705-708/813L/

813M series is ideally applied in environments

where monitoring of power supply to a µP and its

related components is critical.

THEORY OF OPERATION

The SP705-708/813L/813M series is a

microprocessor (µP) 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/

813M series are described in more detail below.

RESET Output

A microprocessor's reset input starts the µP

in a known state. The SP705-708/813L/813M

series asserts reset during power-up and

prevents code execution errors during power-

down or brownout conditions.

On power-up, once VCC reaches 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 re-

leases RESET after 200ms. RESET pulses

LOW whenever VCC dips below the reset thresh-

old, such as in a brownout condition. When a

brownout condition occurs in the middle of a

previously initiated reset pulse, the pulse con-

tinues for at least another 140ms. On power-

down, once VCC falls below the reset threshold,

RESET stays LOW and is guaranteed to be 0.4V

or less until VCC drops below 1V.

The SP707/708/813L/813M 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 µPs, such as Intel's

80C51, require an active-HIGH reset pulse.

Watchdog Timer

The SP705/706/813L/813M watchdog circuit

monitors the µP's activity. If the µP 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.

Typically, WDO will be connected to the

non-maskable interrupt input (NMI) of a µP.

When VCC drops below the reset threshold,

WDO will go LOW whether or not the watch-

dog timer has timed out. Normally this would

trigger an NMI but RESET goes LOW simulta-

neously, 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 func-

tioning as a low-line output.

Figure 14. SP705/706/813L/813M Watchdog Timing Waveforms

Figure 15. SP705/706 Timing Diagrams with WDI Tri-stated. The SP707/708/813L/813M RESET Output is the Inverse

of the RESET Waveform Shown.

RESET*

WDO

+5V

WDI

RESET*

+5V

* externally triggered LOW by MR,

RESET is for the SP813L/813M only

RESET

+5V

MR*

WDO

*externally driven LOW t

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 µP 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 mini-

mum 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/813M. Simply connect

WDO to MR.

Ensuring a Valid RESET Output Down to

VCC = 0V

When VCC falls below 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 100KΩ, 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

PFI

PFO

+5V

GND

RESET

to µP

+12V

1MΩ

130KΩ

Figure 17. Monitoring Both +5V and +12V Power

Supplies

GND GND

RESET

INTERRUPT

I/O LINE

RESET

PFO

PFI R

Unregulated DC

Power Supply

Regulated +5V

Power Supply

0.1µF

PFI

µP

NMI WDO

PUSHBUTTON

SWITCH

SP705

SP706

SP813L

SP813M

Figure 16. Typical Operating Circuit

sensitivity to high-frequency noise on the

line being monitored. RESET can be used to

monitor voltages other than the +5V VCC

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/813M will keep RESET

asserted (where RESET = LOW and RESET =

HIGH). Note that this circuit's accuracy de-

pends on the PFI threshold tolerance, the VCC

line, and the resistors.

Figure 18. Monitoring a Negative Voltage Supply Figure 19. Interfacing to Microprocessors with

Bidirectional RESET I/O for the SP705/706/707/708

Interfacing to mPs with Bidirectional

RESET Pins

µPs 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 µP wants to pull it LOW, indeterminate

logic levels may result. To correct this, connect

a 4.7KΩ resistor between the RESET output and

the µP reset I/O, as shown if Figure 19. Buffer

the RESET output to other system components.

VCC

+5V

GND

VCC

+5V

GND

RESET RESET

4.7KΩ

µP

Buffered RESET connects to System Components

PFI

PFO R

+5V

GND

PFO V-

+5V

TRIP

0V 0V

5.0 - 1.25

1.25 - V

TRIP

V-

10KΩ

RESET

to µP

2N3904

, V

TRIP

< 0

V-

MR 0V

+5V

100KΩ

Applications

The SP705-708/813L/813M 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/813M

series can be used instead of the Dallas

Semiconductor DS1232LP/LPS. Table 2

illustrates to a designer the advantages and trade-

offs of the SP705-708/813L/813M series

compared to the Dallas Semiconductor device.

While the names of the pin descriptions may

differ, the functions are the same or very similar.

Figure 20. Supply Current vs. Temperature Figure 21. Supply Current vs. Supply Voltage

Unlike the DS1232, the SP705-708/813L/813M

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/

813M 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/813M 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/813M series is available in one of the

industry's smallest space-saving package sizes,

the µSOIC.

-40C 25C +85C

4.75V

5.0V

5.5V

Isupply (µA)

Centigrade T emperature

4.75V 5.0V 5.5V

-40C

25C

+85C

Isupply (µA)

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M318/L318M318/L318M318/L318M318/L318M318/L318 13 RM

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M318/L318M318/L318M318/L318M318/L318M318/L318 A/NA/Nngisedybces6.1

V6.4pirT3DNG=LOT /707/507PS

L318L318L318L318L318 A/NA/NngisedybV6.4

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M318M318M318M318M318 A/NA/NngisedybV4.4

dnuorG4DNG /807-507PS

M318/L318M318/L318M318/L318M318/L318M318/L318 35 DNG

HGIHevitcAteseR5TSR807/707PS82 TESER

HGIHevitcAteseR5TSRM318/L318PS71 TESER

WOLevitcAteseR6TSR807-507PS71 TESER

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M318/L318M318/L318M318/L318M318/L318M318/L318 68 ).snartyna(IDW

tupnIegatloV8V

/807-507PS

M318/L318M318/L318M318/L318M318/L318M318/L318 24 V

tupnIliaFrewoPA/NA/N /807-507PS

M318/L318M318/L318M318/L318M318/L318M318/L318 46 IFP

tuptuOliaFrewoPA/NA/N /807-507PS

M318/L318M318/L318M318/L318M318/L318M318/L318 57 OFP

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M318/L318M318/L318M318/L318M318/L318M318/L318 82 ODW

Table 2. Device Overview on Dallas Semiconductor

ALTERNATE

END PINS

(BOTH ENDS)

D1 = 0.005" min.

(0.127 min.)

PACKAGE: PLASTIC

DUAL–IN–LINE

(NARROW)

DIMENSIONS (Inches)

Minimum/Maximum

(mm)

A = 0.210" max.

(5.334 max).

LA2

A1 = 0.015" min.

(0.381min.)

e = 0.100 BSC

(2.540 BSC) e

= 0.300 BSC

(7.620 BSC)

0.115/0.195

(2.921/4.953)

0.014/0.022

(0.356/0.559)

0.045/0.070

(1.143/1.778)

0.008/0.014

(0.203/0.356)

0.355/0.400

(9.017/10.160)

0.300/0.325

(7.620/8.255)

0.240/0.280

(6.096/7.112)

0.115/0.150

(2.921/3.810)

0°/ 15°

(0°/15°)

8–PIN

PACKAGE: PLASTIC

SMALL OUTLINE (SOIC)

(NARROW)

DIMENSIONS (Inches)

Minimum/Maximum

(mm) 8–PIN

h x 45°

0.053/0.069

(1.346/1.748)

0.004/0.010

(0.102/0.249

0.014/0.019

(0.35/0.49)

0.189/0.197

(4.80/5.00)

0.150/0.157

(3.802/3.988)

0.050 BSC

(1.270 BSC)

0.228/0.244

(5.801/6.198)

0.010/0.020

(0.254/0.498)

0.016/0.050

(0.406/1.270)

0°/8°

(0°/8°)

PACKAGE: PLASTIC

MICRO SMALL

OUTLINE (µSOIC)

0.013

±0.005

0.0256

BSC

0.118

±0.004

0.020

0.116

±0.004 0.034

±0.004

0.040

±0.003

0.004

±0.002

0.118

±0.004

0.118

±0.004

0.037

Ref

0.0215

±0.006 3.0˚

±3˚

R .003

12.0˚

±4˚

0.006

±0.006

0.006

±0.006

0.008

0˚ - 6˚

0.012

±0.003

0.01

12.0˚

±4˚

0.16

±0.003

0.0965

±0.003

0.116

±0.004

SOIC devices per tube

All package dimensions in inches

ORDERING INFORMATION

Model .......................................................................................Temperature Range................................................................................ Package

SP705CP ....................................................................................... 0°C to +70°C ......................................................................... 8–pin Plastic DIP

SP705CN ....................................................................................... 0°C to +70°C ..................................................................... 8–pin Narrow SOIC

SP705CU ....................................................................................... 0°C to +70°C ................................................................................. 8-pin µSOIC

SP705EP...................................................................................... -40°C to +85°C ....................................................................... 8–pin Plastic DIP

SP705EN ..................................................................................... -40°C to +85 °C ................................................................... 8–pin Narrow SOIC

SP705EU ..................................................................................... -40°C to +85 °C ............................................................................... 8-pin µSOIC

SP706CP ....................................................................................... 0°C to +70°C ......................................................................... 8–pin Plastic DIP

SP706CN ....................................................................................... 0°C to +70°C ..................................................................... 8–pin Narrow SOIC

SP706CU ....................................................................................... 0°C to +70°C ................................................................................. 8-pin µSOIC

SP706EP...................................................................................... -40°C to +85°C ....................................................................... 8–pin Plastic DIP

SP706EN ..................................................................................... -40°C to +85 °C ................................................................... 8–pin Narrow SOIC

SP706EU ..................................................................................... -40°C to +85 °C ............................................................................... 8-pin µSOIC

SP707CP ....................................................................................... 0°C to +70°C ......................................................................... 8–pin Plastic DIP

SP707CN ....................................................................................... 0°C to +70°C ..................................................................... 8–pin Narrow SOIC

SP707CU ....................................................................................... 0°C to +70°C ................................................................................. 8-pin µSOIC

SP707EP...................................................................................... -40°C to +85°C ....................................................................... 8–pin Plastic DIP

SP707EN ..................................................................................... -40°C to +85 °C ................................................................... 8–pin Narrow SOIC

SP707EU ..................................................................................... -40°C to +85 °C ............................................................................... 8-pin µSOIC

SP708CP ....................................................................................... 0°C to +70°C ......................................................................... 8–pin Plastic DIP

SP708CN ....................................................................................... 0°C to +70°C ..................................................................... 8–pin Narrow SOIC

SP708CU ....................................................................................... 0°C to +70°C ................................................................................. 8-pin µSOIC

SP708EP...................................................................................... -40°C to +85°C ....................................................................... 8–pin Plastic DIP

SP708EN ..................................................................................... -40°C to +85 °C ................................................................... 8–pin Narrow SOIC

SP708EU ..................................................................................... -40°C to +85 °C ............................................................................... 8-pin µSOIC

SP813LCP ..................................................................................... 0°C to +70°C ......................................................................... 8–pin Plastic DIP

SP813LCN ..................................................................................... 0°C to +70°C ..................................................................... 8–pin Narrow SOIC

SP813LCU ..................................................................................... 0°C to +70°C ................................................................................. 8-pin µSOIC

SP813LEP.................................................................................... -40°C to +85°C ....................................................................... 8–pin Plastic DIP

SP813LEN ................................................................................... -40°C to +85 °C ................................................................... 8–pin Narrow SOIC

SP813LEU ................................................................................... -40°C to +85 °C ............................................................................... 8-pin µSOIC

SP813MCP .................................................................................... 0°C to +70°C ......................................................................... 8–pin Plastic DIP

SP813MCN .................................................................................... 0°C to +70°C ..................................................................... 8–pin Narrow SOIC

SP813MCU .................................................................................... 0°C to +70°C ................................................................................. 8-pin µSOIC

SP813MEP................................................................................... -40°C to +85 °C ....................................................................... 8–pin Plastic DIP

SP813MEN .................................................................................. -40°C to +85 °C ................................................................... 8–pin Narrow SOIC

SP813MEU .................................................................................. -40°C to +85 °C .............................................................................. 8-pin ¨µSOIC

Corporation

SIGNAL PROCESSING EXCELLENCE

Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the

application or use of any product or circuit described hereing; neither does it convey any license under its patent rights nor the rights of others.

Please consult the factory for pricing and availability on a Tape-On-Reel option.

Sipex Corporation

Headquarters and

Sales Office

22 Linnell Circle

Billerica, MA 01821

TEL: (978) 667-8700

FAX: (978) 670-9001

e-mail: sales@sipex.com

Sales Office

233 South Hillview Drive

Milpitas, CA 95035

TEL: (408) 934-7500

FAX: (408) 935-7600