Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.NET

X  

MAX708CSA Datasheet(PDF) 6 Page - Maxim Integrated Products

Part # MAX708CSA
Description  Low-Cost, uP Supervisory Circuits
Download  12 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX708CSA Datasheet(HTML) 6 Page - Maxim Integrated Products

Back Button MAX708CSA Datasheet HTML 2Page - Maxim Integrated Products MAX708CSA Datasheet HTML 3Page - Maxim Integrated Products MAX708CSA Datasheet HTML 4Page - Maxim Integrated Products MAX708CSA Datasheet HTML 5Page - Maxim Integrated Products MAX708CSA Datasheet HTML 6Page - Maxim Integrated Products MAX708CSA Datasheet HTML 7Page - Maxim Integrated Products MAX708CSA Datasheet HTML 8Page - Maxim Integrated Products MAX708CSA Datasheet HTML 9Page - Maxim Integrated Products MAX708CSA Datasheet HTML 10Page - Maxim Integrated Products Next Button
Zoom Inzoom in Zoom Outzoom out
 6 / 12 page
background image
_______________Detailed Description
Reset Output
A microprocessor’s (µP’s) reset input starts the µP in a
known state. Whenever the µP is in an unknown state, it
should be held in reset. The MAX705-MAX708/MAX813L
assert reset during power-up and prevent code execu-
tion errors during power-down or brownout conditions.
On power-up, once VCC reaches 1V, RESET is a guaran-
teed logic low of 0.4V or less. As VCC rises, RESET stays
low. When VCC rises above the reset threshold, an inter-
nal timer releases RESET after about 200ms. RESET puls-
es low whenever VCC dips below the reset threshold, i.e.
brownout condition. If brownout occurs in the middle of
a previously initiated reset pulse, the pulse continues for
at least another 140ms. On power-down, once VCC falls
below the reset threshold, RESET stays low and is guar-
anteed to be 0.4V or less until VCC drops below 1V.
The MAX707/MAX708/MAX813L 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 MAX705/MAX706/MAX813L watchdog circuit moni-
tors the µP’s activity. If the µP does not toggle the watch-
dog input (WDI) within 1.6sec and WDI is not three-stat-
ed, WDO goes low. As long as RESET is asserted or the
WDI input is three-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
watchdog timer has timed out yet. Normally this would
trigger an NMI interrupt, but RESET goes low simultane-
ously, and thus overrides the NMI interrupt.
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.
The MAX705/MAX706 have a watchdog timer and a
RESET output. The MAX707/MAX708 have both active-
high and active-low reset outputs. The MAX813L has
both an active-high reset output and a watchdog timer.
Manual Reset
The manual-reset input (MR) allows reset to be trig-
gered 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
MAX705/MAX706/MAX813L. Simply connect WDO to
MR.
Low-Cost, µP Supervisory Circuits
6
_______________________________________________________________________________________
WATCHDOG
TRANSITION
DETECTOR
WATCHDOG
TIMER
TIMEBASE FOR
RESET AND
WATCHDOG
RESET
GENERATOR
VCC
250
µA
8
WDO
7
RESET
(RESET)
5
PFO
GND
3
1.25V
4.65V*
* 4.40V FOR MAX7O6.
( ) ARE FOR MAX813L ONLY.
6
WDI
1
MR
2
VCC
4
PFI
MAX705
MAX706
MAX813L
Figure 1. MAX705/MAX706/MAX813L Block Diagram
RESET
GENERATOR
VCC
250
µA
8
RESET
7
RESET
5
PFO
GND
3
1.25V
4.65V*
* 4.40V FOR MAX7O6.
1
MR
2
VCC
4
PFI
MAX707
MAX708
Figure 2. MAX707/MAX708 Block Diagram


Similar Part No. - MAX708CSA

ManufacturerPart #DatasheetDescription
logo
Maxim Integrated Produc...
MAX708CSA MAXIM-MAX708CSA Datasheet
169Kb / 12P
   Low-Cost, μP Supervisory Circuits
Rev. 8; 3/10
MAX708CSA MAXIM-MAX708CSA Datasheet
229Kb / 12P
   Low-Cost, Supervisory Circuits
Rev. 9; 1/13
logo
ARTSCHIP ELECTRONICS CO...
MAX708CSA ARTSCHIP-MAX708CSA Datasheet
313Kb / 10P
   Low-Cost, pervisory Circuit
More results

Similar Description - MAX708CSA

ManufacturerPart #DatasheetDescription
logo
Analog Devices
ADM705 AD-ADM705 Datasheet
143Kb / 8P
   Low Cost uP Supervisory Circuits
REV. B
logo
Maxim Integrated Produc...
MAX706P MAXIM-MAX706P_06 Datasheet
465Kb / 15P
   3V Voltage Monitoring, Low-Cost uP Supervisory Circuits
Rev 5; 4/06
MAX706RCSA-T MAXIM-MAX706RCSA-T Datasheet
229Kb / 12P
   Low-Cost, Supervisory Circuits
Rev. 9; 1/13
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
ADM706ARZ-REEL7 AD-ADM706ARZ-REEL7 Datasheet
338Kb / 12P
   Low Cost Microprocessor Supervisory Circuits
Rev. G
ADM705ARZ AD-ADM705ARZ Datasheet
338Kb / 12P
   Low Cost Microprocessor Supervisory Circuits
Rev. G
logo
Maxim Integrated Produc...
MAX708ESA MAXIM-MAX708ESA Datasheet
229Kb / 12P
   Low-Cost, μP Supervisory Circuits
Rev. 9; 1/13
logo
Analog Devices
ADM705 AD-ADM705_V01 Datasheet
410Kb / 12P
   Low Cost Microprocessor Supervisory Circuits
Rev. H
ADM706AR-REEL AD-ADM706AR-REEL 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


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