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PDF SP705 Data sheet ( Hoja de datos )
| Número de pieza | SP705 | |
| Descripción | Low Power Microprocessor Supervisory Circuits | |
| Fabricantes | Exar | |
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June 2011
SP705-SP708-SP813L
Low Power Microprocessor Supervisory Circuits
Rev. 2.1.0
GENERAL DESCRIPTION
The SP705-708/813L series is a family of
microprocessor (µP) supervisory circuits that
integrate myriad components involved in
discrete solutions which monitor power-supply
and battery in mP 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 µP 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 µP and
related digital components is demanded.
APPLICATIONS
• Processors & DSPs Based Systems
• Industrial & Medical Instruments
FEATURES
• Precision Voltage Monitor
− SP705/SP707/SP813L: 4.65V
− SP706/SP708: 4.40V
• 200ms RESET Pulse Width
• Independent Watchdog Timer
− 1.6s Timeout (SP705/SP706/SP813L)
• 60µA Maximum Supply Current
• Debounced TTL/CMOS Manual Reset
Input
• RESET Asserted Down to VCC=1.1V
• Voltage Monitor for Power Failure or
Low Battery Warning
• 8-Pin PDIP, NSOIC and MSOP Packages
• Pin Compatible with Industry
Standards 705-708-813L Series
• Functionally Compatible to Industry
Standard 1232 Series
Part Number
SP705
SP706
SP707
SP708
SP813L
RESET Threshold
4.65V
4.40V
4.65V
4.40V
4.65V
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%
Exar Corporation
48720 Kato Road, Fremont CA 94538, USA
www.exar.com
Tel. +1 510 668-7000 – Fax. +1 510 668-7001
1 page  
SP705-SP708-SP813L
Low Power Microprocessor Supervisory Circuits
Name
WDO
RESET
Pin Number
SP705-SP706
SP707-SP708
SOIC
MSOP
SOIC
MSOP
82- -
- -82
SP813L
DIP
SOIC
8
7
Description
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 that the SP813L
has a reset output only.
ORDERING INFORMATION
Part Number
SP705CN-L
SP705CN-L/TR
SP705EN-L
SP705EN-L/TR
SP705CU-L
SP705CU-L/TR
Temperature
Range
0°C≤TA≤+70°C
0°C≤TA≤+70°C
-40°C≤TA≤+85°C
-40°C≤TA≤+85°C
0°C≤TA≤+70°C
0°C≤TA≤+70°C
Marking
SP705C
YYWWL
#
SP705E
YYWWL
#
705C
#
YWW
Package
Packing
Quantity
Note 1
8-pin NSOIC
Bulk
Lead Free
8-pin NSOIC 2.5K/Tape & Reel Lead Free
8-pin NSOIC
Bulk
Lead Free
8-pin NSOIC 2.5K/Tape & Reel Lead Free
8-pin MSOP
Bulk
Lead Free
8-pin MSOP 2.5K/Tape & Reel Lead Free
SP706CN-L
SP706CN-L/TR
SP706EN-L
SP706EN-L/TR
SP706CU-L
SP706CU-L/TR
0°C≤TA≤+70°C
0°C≤TA≤+70°C
-40°C≤TA≤+85°C
-40°C≤TA≤+85°C
0°C≤TA≤+70°C
0°C≤TA≤+70°C
SP706C
YYWWL
#
SP706E
YYWWL
#
706C
#
YWW
8-pin NSOIC
Bulk
Lead Free
8-pin NSOIC 2.5K/Tape & Reel Lead Free
8-pin NSOIC
Bulk
Lead Free
8-pin NSOIC 2.5K/Tape & Reel Lead Free
8-pin MSOP
Bulk
Lead Free
8-pin MSOP 2.5K/Tape & Reel Lead Free
SP707CN-L
SP707CN-L/TR
SP707EN-L
SP707EN-L/TR
SP707CU-L
SP707CU-L/TR
0°C≤TA≤+70°C
0°C≤TA≤+70°C
-40°C≤TA≤+85°C
-40°C≤TA≤+85°C
0°C≤TA≤+70°C
0°C≤TA≤+70°C
SP707C
YYWWL
#
SP707E
YYWWL
#
707C
#
YWW
8-pin NSOIC
Bulk
Lead Free
8-pin NSOIC 2.5K/Tape & Reel Lead Free
8-pin NSOIC
Bulk
Lead Free
8-pin NSOIC 2.5K/Tape & Reel Lead Free
8-pin MSOP
Bulk
Lead Free
8-pin MSOP 2.5K/Tape & Reel Lead Free
SP708CN-L
SP708CN-L/TR
SP708EN-L
SP708EN-L/TR
0°C≤TA≤+70°C
0°C≤TA≤+70°C
-40°C≤TA≤+85°C
-40°C≤TA≤+85°C
SP708C
YYWWL
#
SP708E
YYWWL
#
8-pin NSOIC
Bulk
Lead Free
8-pin NSOIC 2.5K/Tape & Reel Lead Free
8-pin NSOIC
Bulk
Lead Free
8-pin NSOIC 2.5K/Tape & Reel Lead Free
SP813LCN-L
SP813LCN-L/TR
SP813LEN-L
SP813LEN-L/TR
SP813LCP-L
SP813LEP-L
0°C≤TA≤+70°C
0°C≤TA≤+70°C
-40°C≤TA≤+85°C
-40°C≤TA≤+85°C
0°C≤TA≤+70°C
-40°C≤TA≤+85°C
SP813LC
YYWWL
#
SP813LE
YYWWL
#
SP813LC
YWWL#
SP813LE
YWWL#
8-pin NSOIC
Bulk
Lead Free
8-pin NSOIC 2.5K/Tape & Reel Lead Free
8-pin NSOIC
Bulk
Lead Free
8-pin NSOIC 2.5K/Tape & Reel Lead Free
8-pin PDIP
Bulk
Lead Free
8-pin PDIP
Bulk
Lead Free
“YY” = Year – “WW” = Work Week – “#” = Lot Number
© 2011 Exar Corporation
5/17
Note 2
Rev. 2.1.0
5 Page 
SP705-SP708-SP813L
Low Power Microprocessor Supervisory Circuits
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 +5V VCC line.
Connect PFO to MR to initiate a RESET pulse
when PFI drops below 1.25V. Figure 21 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.
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.
Fig. 21: Monitoring +5V and +12V Power Supplies
MONITORING A NEGATIVE VOLTAGE SUPPLY
The power-fail comparator can also monitor a
negative supply rail, shown in Figure 22. 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,
Fig. 22: Monitoring a Negative Voltage Supply
INTERFACING TO µPS 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 23. Buffer the RESET output to other
system components.
© 2011 Exar Corporation
11/17
Rev. 2.1.0
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet SP705.PDF ] | |
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