Datasheet SP706PCN, SP706REU, SP706SCN, SP706SCP, SP706SCU Datasheet (Sipex Corporation)

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Page 1

SP706P/R/S/T, SP708R/S/T

+3.0V/+3.3V Low Power Microprocessor

Supervisory Circuits

■ Precision Low Voltage Monitor: SP706P/R and SP708R at +2.63V SP706S and SP708S at +2.93V SP706T and SP708T at +3.08V

■ RESET Pulse Width - 200ms

■ Independent Watchdog Timer - 1.6 sec

Timeout (SP706P/S/R/T)

■ 40µA Maximum Supply Current

■ Debounced TTL/CMOS Manual-Reset Input

■ RESET Asserted Down to VCC = 1V

■ RESET Output:

SP706P Active-High SP706R/S/T Active-Low SP708R/S/T Both Active High + Active Low

■ WDI Can Be Left Floating, Disabling the Watchdog Function

DESCRIPTION

The SP706P/S/R/T, SP708R/S/T 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 SP706P/S/R/T, SP708R/S/T series will significantly improve system reliability and operational efficiency when compared to results obtained with discrete components. The features of the SP706P/S/R/T, SP708R/S/T series include a watchdog timer, a µP reset, a Power Fail Comparator, and a manual-reset input. The SP706P/ S/R/T, SP708R/S/T series is ideal for +3.0V or +3.3V applications in automotive systems, computers, controllers, and intelligent instruments. The SP706P/S/R/T, SP708R/S/T series is an ideal solution for systems in which critical monitoring of the power supply to the µP and related digital components is demanded.

rebmuNtraPevitcATESERdlohserhTTESERteseRlaunaMycaruccAIFPtupnIgodhctaW P607PS R607PS S607PS T607PS R807PS S807PS T807PS

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■ Built-In Vcc Glitch Immunity

■ Available in 8-pin PDIP, NSOIC, and

µSOIC packages

■ Voltage Monitor for Power Failure or Low Battery Warning

■ Pin Compatible Enhancement to Industry Standards 706P/R/S/T and 708R/S/T

Page 2

ABSOLUTE MAXIMUM RATINGS

These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability.

Terminal Voltage (with respect to GND):

VCC........................................................-0.3V to +6.0V

All Other Inputs (Note 1)..............-0.3V to (V

+3.0V)

Input Current: V

.....................................................................20mA

GND...................................................................20mA

Output Current (all outputs)...............................20mA

ESD Rating...........................................................2kV

Continuous Power Dissipation Plastic DIP (derate 9.09mW/ SO (derate 5.88mW/ Mini SO (derate 4.10mW/

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

Lead Temperature (solding 10 sec)................+300˚C

SPECIFICATIONS

Vcc = 2.7V to 5.5V for SP70_P/R, VCC = 3.0 to 5.5V for SP70_S, VCC = 3.15V to 5.5V for SP70_T, TA= T typical at 25°C.

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V,egnaRegatloVgnitarepO

0.15.5V

C above +70OC)..................727mW

C above +70OC)..................471mW

C above +70OC)..................330mW

to T

MIN

, unless otherwise noted,

MAX

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YLPPUS

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V=RM

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S_07PS T_07PS

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KNIS

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2.1=mA 008= µA Am2.3=

ECRUOS

008= µA

005= µA

512= µA

Am2.1=

Am2.3=

Page 3

SPECIFICATIONS (continued)

Vcc = 2.7V to 5.5V for SP70_P/R, VCC = 3.0 to 5.5V for SP70_S, VCC = 3.15V to 5.5V for SP70_T, TA= T typical at 25°C.

RETEMARAP.NIM.PYT.XAMSTINUSNOITIDNOC

egatloVtuptuOODW

µA

RMV,V0=

VCC5.1-

RMtnerruCpU-lluP52

RMt,htdiWesluP

RMdlohserhTtupnI

RMt,yaleDtuOteseRot

dlohserhTtupnIIFP

tnerruCtupnIIFP00.52-10.000.52An

OFPegatloVtuptuO

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001

052

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051

6.0

Vx7.0

8.0

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052

02.152.103.1V

Vx8.0

3.0

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to T

MIN

MAX

)XAM(TSR

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V<V5.4

ehtrofV3.3 T/S_07PS gnillafIFP,

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, unless otherwise noted,

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Am2.3=

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I,V6.3<

2.1=mA

KNIS

I,V5.5< I,V5.5<

KNIS

008= µA

ECRUOS

Am2.3=

005= µA

Am2.1=

005= µA

Page 4

GND

PFI

GND

PFI

DIP and SOIC

1 2

SP706P/R/S/T

3 4

1 2

SP708S/R/T

3 4

WDO

RESET / RESET*

WDI

PFO

RESET

N.C.

PFO

RESET / RESET*

WDO

RESET RESET

1 2

SP706P/R/S/T

3 4

1 2

3 4

µSOIC

SP708S/R/T

WDI

PFO

PFI

GND

N.C.

PFO

PFI

GND

Figure 1. Pinouts

*SP706P only

Page 5

NOITPIRCSEDNIP

EMANNOITCNUF

P607PST/S/R607PST/S/R807PS

/PID

µCIOS

CIOS

/PID

CIOS

µCIOS

/PID

µCIOS

CIOS

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Table 1. Device Pin Description

Page 6

WDI

WATCHDOG TRANSITION

DETECTOR

70µA

WATCHDOG

TIMER

TIMEBASE FOR

RESET AND WATCHDOG

RESET

GENERATOR

WDO

RESET/RESET*

2.63V for the

2.93V for the

3.08V for the

SP706P/R SP706S SP706T

PFI

1.25V

GND

Figure 2. Internal Block Diagram for the SP706P/R/S/T

250µA

SP706P/R/S/T

RESET

GENERATOR

PFO

* For the SP706P only

RESET

2.63V for the SP708R

2.93V for the SP708S

3.08V for the SP708T

PFI

PFO

1.25V

SP708R/S/T

GND

Page 7

+3.3V

1.2V

1.4V PFI

Figure 4A. Power-Fail Comparator De-assertion Response Time.

1.4V

PFI

1.2V

PFO 0V

3V PFO

= +3.3V

= +25 C

PFI

+1.25V

PFO

30pF

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

+3.3V

= +3.3V

= +25 C

1KΩ

PFI

PFO

+1.25V

30pF

1KΩ

Figure 5A. Power-Fail Comparator Assertion Response Time.

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

VCC

TA = +25oC

3.6V V

2KΩ

RESET

330pF

GND

Figure 6A. SP706 RESET Output Voltage vs. Supply Voltage.

Figure 6B. Circuit for the SP706 RESET Output Voltage vs. Supply Voltage.

Page 8

TA = +25oC

10KΩ

RESET

330pF

GND

Figure 7A. SP706 RESET Response Time Figure 7B. Circuit for the SP706 RESET Response

3.2V RESET

3.2V

RESET 0V

Figure 8. SP708 RESET and RESET Assertion Figure 9. SP708 RESET and RESET De-Assertion

Time

2.8V RESET

2.8V

RESET

TA = +25oC

10KΩ

RESET

330pF

RESET

330pF

GND

10KΩ

Figure 10. Circuit for the SP708 RESET and RESET Assertion and De-Assertion

Page 9

3.6V V

RESET

Figure 11. SP708 RESET Output Voltage vs. Supply

Figure 12. SP708 RESET Response Time

Voltage

RESET

330pF

10KΩ

GND

Figure 13. Circuit for the SP708 RESET Output Voltage vs. Supply Voltage and the RESET Response Time Figures

Page 10

FEATURES

The SP706P/R/S/T-SP708R/S/T 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 sec.

3. A 1.25V threshold detector for power-fail warning, low battery detection, or monitoring a power supply other than +3.3V/+3.0V.

4. An active-LOW manual-reset that allows RESET to be triggered by a pushbutton switch.

The SP706R/S/T devices are the same as the SP708R/S/T devices except for the active-HIGH RESET substitution of the watchdog timer. The SP706P device is the same as the SP706R device except an active-HIGH RESET is provided rather than an active-LOW RESET.

THEORY OF OPERATION

The SP706P/R/S/T-SP708R/S/T 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 of a system. The watchdog functions of this product family will continuously oversee the operational status of a system. The operational features and benefits of the SP706P/R/S/T-SP708R/S/T series are described, in more detail, below.

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. During 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 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 SP706P/R/S/T-SP708R/S/T series 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 independent of the current status of the watchdog timer. Normally this would trigger an NMI but RESET goes LOW simultaneously, and thus overrides the NMI.

RESET Output

A microprocessor's reset input starts the µP in a known state. The SP706P/R/S/T-SP708R/ S/T series asserts reset during power-up and

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.

prevents code execution errors during powerdown or brownout conditions.

During power-up, once VCC reaches 1V, RESET is a guaranteed logic LOW of 0.4V or less. As V

rises, RESET stays LOW. When VCC rises above

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.

Page 11

WDI

WDO

RESET*

+3.3V

* externally triggered LOW by MR,

RESET is for the SP813L/813M only

Figure 14. Watchdog Timing Waveforms

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 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 SP706P/R/S/T-SP708R/S/T series. Simply connect WDO to MR.

WDO

RESET

MR*

+3.3V

*externally driven LOW

Figure 15. Timing Diagrams with WDI Tri-stated. The RESET Output is the Inverse of the RESET Waveform Shown.

Page 12

Ensuring a Valid RESET Output Down to VCC = 0V

When V

falls below 1V, the 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 pulldown 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 sensitivity to high-frequency noise on the line being monitored. RESET can be used to monitor voltages other than the +3.3V/+3.0V

line. Connect PFO to MR to initiate a

RESET pulse when PFI drops below 1.25V. Figure 17 shows the SP706R/S/T-SP708R/ S/T series configured to assert RESET when the +3.3V/+3.0V 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 SP706P/R/S/T-SP708R/S/ T series 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

µPs with bidirectional RESET pins, such as the Motorola 68HC11 series, can contend with the RESET output. If, for example, the RESET

Regulated +3.3V/+3.0V

Power Supply

Unregulated DC

Power Supply

RESET

µP

INTERRUPT I/O LINE

NMI

GND

Figure 16. Typical Operating Circuit

0.1µF

RESET

PFO

PFI

WDO

PUSHBUTTON

SWITCH

GND

PFI

to µP

Figure 17. Monitoring Both +3.3V/+3.0V and +12V Power Supplies

+3.3V/+3.0V

PFO

RESET

GND

+12V

1MΩ 1%

PFI

130KΩ 1%

Page 13

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.

Negative-Going VCC Transients

While issuing resets to the µP during power-up, power-down, and brownout conditions, these supervisors are relatively immune to shortduration negative-going VCC transients (glitches). It is usually undesirable to reset the µP when V experiences only small glitches.

the magnitude indicated (reset comparator overdrive). The graph shows the maximum pulse width a negative-going VCC transient may typically have without causing a reset pulse to be issued. As the amplitude of the transient increases (i.e. goes farther below the reset threshold), the maximum allowable pulse width decreases. Typically, a VCC transient that goes 100mV below the reset threshold and lasts for 40µs or less will not cause a reset pulse to be issued. A 100nF bypass capacitor mounted close to the VCC pin provides additional transient immunity.

Applications

Figure 20 shows maximum transient duration vs. reset-comparator overdrive, for which reset pulses are not generated. The data was generated using negative-going VCC pulses, starting at 3.3V and ending below the reset threshold by

+3.3V/+3.0V

100kΩ

2N3904

PFO

to µP

+3.3V

PFO

100kΩ

RESET

GND

VCC - 1.25

1.25 - V

TRIP

, V

TRIP

< 0

PFI

V-

The SP706P/R/S/T-SP708R/S/T series offers unmatched performance and the lowest power consumption for these industry standard devices. Refer to Figures 21 and 22 for supply current performance characteristics rated against temperature and supply voltages.

Buffered RESET connects to System Components

+3.3V/+3.0V

GND

RESET

4.7KΩ

RESET

+3.3V/+3.0V

µP

GND

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

Bidirectional RESET I/O for the SP706

Page 14

100

Maximum Transient Duration

20.2

20.1

1nF Capacitor V

TO GND

Transient Duration (µS)

RESET

Generated

OUT

Above Line

RESET

Generated

100

1000

10000

Reset Overdrive (mV)

Figure 20. Maximum Transient Duration Without Causing a Reset Pulse vs. Reset Comparator Overdrive

Supply Current (µA)

2.5 3 3.5 4 4.5 5 5.5

Supply Voltage (V)

Figure 22. Supply Current vs. Supply Voltage

20.0

19.9

19.8

19.7

19.6

Supply Current (mA)

19.5

19.4

-60 -40 -20 0 2 0 40 6 0 80 100

Temperature (°C)

cc=3.3V

Figure 21. Supply Current vs. Temperature

Page 15

D1 = 0.005" min.

(0.127 min.)

e = 0.100 BSC

(2.540 BSC)

ALTERNATE

END PINS

(BOTH ENDS)

PACKAGE: PLASTIC

DUAL–IN–LINE (NARROW)

A1 = 0.015" min.

(0.381min.)

A = 0.210" max.

(5.334 max).

eA = 0.300 BSC

(7.620 BSC)

DIMENSIONS (Inches)

Minimum/Maximum

(mm) A2

8–PIN

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°)

Page 16

PACKAGE: PLASTIC

SMALL OUTLINE (SOIC) (NARROW)

h x 45°

DIMENSIONS (Inches)

Minimum/Maximum

(mm) A

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)

8–PIN

0°/8°

(0°/8°)

Page 17

PACKAGE: PLASTIC

MICRO SMALL OUTLINE (µSOIC)

0.020

0.0965 ±0.003

0.020 1

0.013 ±0.005

0.0256

0.116

±0.004

0.118

±0.004

BSC

0.118

±0.004

0.004

±0.002

0.034

±0.004

0.040

±0.003

0.012

±0.003

0.16

R .003

12.0˚ ±4˚

0.01

12.0˚ ±4˚

0.008 0˚ - 6˚

0.006

±0.006

0.006

±0.006

0.0215 ±0.006

0.037 Ref

±0.004

0.116

0.118

±0.004

3.0˚ ±3˚

All package dimensions are in inches

50 USOIC devices per tube

Page 18

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

ORDERING INFORMATION

SP706PCP ..................................................................................... 0°C to +70°C ...................................................................................8–pin PDIP

SP706PCN .....................................................................................0°C to +70°C ................................................................................ 8–pin NSOIC

SP706PCU .....................................................................................0°C to +70°C ................................................................................. 8-pin µSOIC

SP706RCP .....................................................................................0°C to +70°C ................................................................................... 8–pin PDIP

SP706RCN..................................................................................... 0°C to +70°C ................................................................................8–pin NSOIC

SP706RCU..................................................................................... 0°C to +70°C ................................................................................. 8-pin µSOIC

SP706SCP ..................................................................................... 0°C to +70°C ...................................................................................8–pin PDIP

SP706SCN .....................................................................................0°C to +70°C ................................................................................ 8–pin NSOIC

SP706SCU .....................................................................................0°C to +70°C ................................................................................. 8-pin µSOIC

SP706TCP ..................................................................................... 0°C to +70°C ...................................................................................8–pin PDIP

SP706TCN ..................................................................................... 0°C to +70°C ................................................................................8–pin NSOIC

SP706TCU ..................................................................................... 0°C to +70°C ................................................................................. 8-pin µSOIC

SP706PEP ................................................................................... -40°C to +85 °C ................................................................................. 8–pin PDIP

SP706PEN ................................................................................... -40°C to +85°C ..............................................................................8–pin NSOIC

SP706PEU ................................................................................... -40°C to +85°C ............................................................................... 8-pin µSOIC

SP706REP ................................................................................... -40°C to +85°C .................................................................................8–pin PDIP

SP706REN ................................................................................... -40°C to +85°C ..............................................................................8–pin NSOIC

SP706REU ................................................................................... -40°C to +85°C ............................................................................... 8-pin µSOIC

SP706SEP ................................................................................... -40°C to +85 °C ................................................................................. 8–pin PDIP

SP706SEN ................................................................................... -40°C to +85°C ..............................................................................8–pin NSOIC

SP706SEU ................................................................................... -40°C to +85°C ............................................................................... 8-pin µSOIC

SP706TEP ................................................................................... -40°C to +85°C .................................................................................8–pin PDIP

SP706TEN ................................................................................... -40°C to +85 °C .............................................................................. 8–pin NSOIC

SP706TEU ................................................................................... -40°C to +85 °C ............................................................................... 8-pin µSOIC

SP708RCP .....................................................................................0°C to +70°C ................................................................................... 8–pin PDIP

SP708RCN..................................................................................... 0°C to +70°C ................................................................................8–pin NSOIC

SP708RCU..................................................................................... 0°C to +70°C ................................................................................. 8-pin µSOIC

SP708SCP ..................................................................................... 0°C to +70°C ...................................................................................8–pin PDIP

SP708SCN .....................................................................................0°C to +70°C ................................................................................ 8–pin NSOIC

SP708SCU .....................................................................................0°C to +70°C ................................................................................. 8-pin µSOIC

SP708TCP ..................................................................................... 0°C to +70°C ...................................................................................8–pin PDIP

SP708TCN ..................................................................................... 0°C to +70°C ................................................................................8–pin NSOIC

SP708TCU ..................................................................................... 0°C to +70°C ................................................................................. 8-pin µSOIC

SP708REP ................................................................................... -40°C to +85°C .................................................................................8–pin PDIP

SP708REN ................................................................................... -40°C to +85°C ..............................................................................8–pin NSOIC

SP708REU ................................................................................... -40°C to +85°C ............................................................................... 8-pin µSOIC

SP708SEP ................................................................................... -40°C to +85 °C ................................................................................. 8–pin PDIP

SP708SEN ................................................................................... -40°C to +85°C ..............................................................................8–pin NSOIC

SP708SEU ................................................................................... -40°C to +85°C ............................................................................... 8-pin µSOIC

SP708TEP ................................................................................... -40°C to +85°C .................................................................................8–pin PDIP

SP708TEN ................................................................................... -40°C to +85 °C .............................................................................. 8–pin NSOIC

SP708TEU ................................................................................... -40°C to +85 °C ............................................................................... 8-pin µSOIC

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

Corporation

SIGNAL PROCESSING EXCELLENCE

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

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 herein; neither does it convey any license under its patent rights nor the rights of others.

Datasheet SP706PCN, SP706REU, SP706SCN, SP706SCP, SP706SCU Datasheet (Sipex Corporation)

Specifications and Main Features

Frequently Asked Questions

User Manual