Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.NET

X  

SP705EP Datasheet(PDF) 11 Page - Sipex Corporation

Part # SP705EP
Description  Low Power Microprocessor Supervisory Circuits
Download  18 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  SIPEX [Sipex Corporation]
Direct Link  http://www.sipex.com
Logo SIPEX - Sipex Corporation

SP705EP Datasheet(HTML) 11 Page - Sipex Corporation

Back Button SP705EP Datasheet HTML 7Page - Sipex Corporation SP705EP Datasheet HTML 8Page - Sipex Corporation SP705EP Datasheet HTML 9Page - Sipex Corporation SP705EP Datasheet HTML 10Page - Sipex Corporation SP705EP Datasheet HTML 11Page - Sipex Corporation SP705EP Datasheet HTML 12Page - Sipex Corporation SP705EP Datasheet HTML 13Page - Sipex Corporation SP705EP Datasheet HTML 14Page - Sipex Corporation SP705EP Datasheet HTML 15Page - Sipex Corporation Next Button
Zoom Inzoom in Zoom Outzoom out
 11 / 18 page
background image
11
SP705DS/09
SP705 Low Power Microprocessor Supervisory Circuits
© Copyright 2000 Sipex Corporation
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
V
CC = 0V
When V
CC 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 100K
Ω,largeenough
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
VCC
+5V
GND
RESET
to
µP
MR
+12V
1M
1%
130K
1%
Figure 17. Monitoring Both +5V and +12V Power
Supplies
GND
GND
RESET
INTERRUPT
I/O LINE
VCC
RESET
PFO
PFI
R2
R1
Unregulated DC
Power Supply
Regulated +5V
Power Supply
VCC
0.1
µF
PFI
µP
NMI
WDO
PUSHBUTTON
SWITCH
MR
SP705
SP706
SP813L
SP813M
Figure 16. Typical Operating Circuit


Similar Part No. - SP705EP

ManufacturerPart #DatasheetDescription
logo
Sipex Corporation
SP705EP SIPEX-SP705EP Datasheet
197Kb / 18P
   Low Power Microprocessor Supervisory Circuits
SP705EP SIPEX-SP705EP Datasheet
429Kb / 18P
   Low Power Microprocessor Supervisory Circuits
logo
Exar Corporation
SP705EP EXAR-SP705EP Datasheet
1Mb / 18P
   Low Power Microprocessor Supervisory Circuits
SP705EP-L/TR EXAR-SP705EP-L/TR Datasheet
1Mb / 18P
   Low Power Microprocessor Supervisory Circuits
More results

Similar Description - SP705EP

ManufacturerPart #DatasheetDescription
logo
Shanghai Consonance Ele...
CN705 CONSONANCE-CN705 Datasheet
390Kb / 14P
   Low Power Microprocessor Supervisory Circuits
logo
Sipex Corporation
SP706REN-L SIPEX-SP706REN-L Datasheet
201Kb / 18P
   Low Power Microprocessor Supervisory Circuits
SP707EN-L SIPEX-SP707EN-L Datasheet
201Kb / 18P
   Low Power Microprocessor Supervisory Circuits
logo
Exar Corporation
SP705 EXAR-SP705 Datasheet
1Mb / 18P
   Low Power Microprocessor Supervisory Circuits
SP813LCN-L EXAR-SP813LCN-L Datasheet
1Mb / 17P
   Low Power Microprocessor Supervisory Circuits
logo
Sipex Corporation
SP705 SIPEX-SP705 Datasheet
197Kb / 18P
   Low Power Microprocessor Supervisory Circuits
SP705 SIPEX-SP705_06 Datasheet
429Kb / 18P
   Low Power Microprocessor Supervisory Circuits
logo
Exar Corporation
SP690A EXAR-SP690A Datasheet
406Kb / 16P
   Low Power Microprocessor Supervisory
logo
Analog Devices
ADM707ARZ AD-ADM707ARZ Datasheet
338Kb / 12P
   Low Cost Microprocessor Supervisory Circuits
Rev. G
ADM708ARZ AD-ADM708ARZ Datasheet
338Kb / 12P
   Low Cost Microprocessor Supervisory Circuits
Rev. G
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18


Datasheet Download

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEET.NET
Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Contact us   |   Privacy Policy   |   Link Exchange   |   Manufacturer List
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com