Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.NET

X  

ISL88011IH522Z-TK Datasheet(PDF) 8 Page - Intersil Corporation

Part # ISL88011IH522Z-TK
Description  5 Ld Voltage Supervisors with Adjustable Power-On Reset, Dual Voltage Monitoring or Watchdog Timer Capability
Download  12 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  INTERSIL [Intersil Corporation]
Direct Link  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL88011IH522Z-TK Datasheet(HTML) 8 Page - Intersil Corporation

Back Button ISL88011IH522Z-TK Datasheet HTML 4Page - Intersil Corporation ISL88011IH522Z-TK Datasheet HTML 5Page - Intersil Corporation ISL88011IH522Z-TK Datasheet HTML 6Page - Intersil Corporation ISL88011IH522Z-TK Datasheet HTML 7Page - Intersil Corporation ISL88011IH522Z-TK Datasheet HTML 8Page - Intersil Corporation ISL88011IH522Z-TK Datasheet HTML 9Page - Intersil Corporation ISL88011IH522Z-TK Datasheet HTML 10Page - Intersil Corporation ISL88011IH522Z-TK Datasheet HTML 11Page - Intersil Corporation ISL88011IH522Z-TK Datasheet HTML 12Page - Intersil Corporation  
Zoom Inzoom in Zoom Outzoom out
 8 / 12 page
background image
8
FN8093.1
December 14, 2006
Power On Reset (POR)
Applying at least 1V to the VDD pin activates a POR circuit
which asserts reset (i.e. RST goes HIGH while RST goes
LOW). The reset signals remain asserted until the voltage at
VDD and/or VMON rise above the minimum voltage sense
level for time period tPOR. This ensures that the voltages
have stabilized.
These reset signals provide several benefits:
• It prevents the system microprocessor from starting to
operate with insufficient voltage.
• It prevents the processor from operating prior to
stabilization of the oscillator.
• It ensures that the monitored device is held out of
operation until internal registers are properly loaded.
• It allows time for an FPGA to download its configuration
prior to initialization of the circuit.
Adjusting POR Timeout via CPOR Pin
On the ISL88011 and ISL88014, users can adjust the Power
On Reset timeout delay (tPOR) up to many times the normal
tPOR of 250ms. To do this, connect a capacitor between
CPOR and ground (see Figure 3). For example, connecting a
30pF capacitor to CPOR will increase tPOR from a typical
250ms to about 2.5s. NOTE: Care should be taken in PCB
layout and capacitor placement in order to reduce stray
capacitance as much as possible, which lengthens the tPOR
timeout period.
Manual Reset
The manual reset input (MR) allows the user to trigger a
reset by using a push-button switch. The MR input is an
active-low debounced input. By connecting a push-button
directly from MR to ground, the designer adds manual
system reset capability (see Figure 4). Reset is asserted if
the MR pin is pulled low to less than 100mV for 1µs or longer
while the push-button is closed. After MR is released, the
reset outputs remain asserted for tPOR (200ms) and then
released.
Watchdog Timer
The Watchdog Timer circuit checks microprocessor activity
by monitoring the WDI input pin. The microprocessor must
periodically toggle the WDI pin within tWDT (1.6s nominal),
otherwise the reset signal is asserted (see Figure 5).
Internally, the 1.6s timer is cleared by either a reset or by
toggling the WDI input.
Besides the 1.6s default timeout during normal operation,
these devices also have a longer 51s timeout for startup.
During this time, a reset cannot be asserted due to the WDI
not being toggled. The longer delay at power-on allows an
operating system to boot, an FPGA to initialize, or the
system software to initialize without the burden of dealing
with the Watchdog.
Symbol Table
0
2
3
5
0
102030
CPOR (pF)
ISL88011
CPOR
ISL88014
FIGURE 3. ADJUSTING tPOR WITH A CAPACITOR
40
50
60
70
80
4
1
6
VDD
RST/MR
PB
ISL88012
Rpu
ISL88013
ISL88014
ISL88015
ISL88011
FIGURE 4. CONNECTING A MANUAL RESET PUSH-BUTTON
WAVEFORM
INPUTS
OUTPUTS
Must be
steady
Will be
steady
May change
from LOW
to HIGH
Will change
from LOW
to HIGH
May change
from HIGH
to LOW
Will change
from HIGH
to LOW
Don’t Care:
Changes
Allowed
Changing:
State Not
Known
N/A
Center Line
is High
Impedance
ISL88011, ISL88012, ISL88013, ISL88014, ISL88015


Similar Part No. - ISL88011IH522Z-TK

ManufacturerPart #DatasheetDescription
logo
Renesas Technology Corp
ISL88011IH522Z-TK RENESAS-ISL88011IH522Z-TK Datasheet
708Kb / 15P
   5 Ld Voltage Supervisors with Adjustable Power-On Reset, Dual Voltage Monitoring or Watchdog Timer Capability
More results

Similar Description - ISL88011IH522Z-TK

ManufacturerPart #DatasheetDescription
logo
Renesas Technology Corp
ISL88011 RENESAS-ISL88011 Datasheet
708Kb / 15P
   5 Ld Voltage Supervisors with Adjustable Power-On Reset, Dual Voltage Monitoring or Watchdog Timer Capability
logo
Intersil Corporation
ISL88011_0602 INTERSIL-ISL88011_0602 Datasheet
270Kb / 11P
   5-Pin Voltage Supervisors with Adjustable Power-On Reset, Dual Voltage Monitoring or Watchdog Timer Capability
logo
Fujitsu Component Limit...
MB3793-45 FUJITSU-MB3793-45 Datasheet
187Kb / 28P
   POWER-VOLTAGE MONITORING IC WITH WATCHDOG TIMER
MB3793-42PNF-G FUJITSU-MB3793-42PNF-G Datasheet
183Kb / 23P
   POWER-VOLTAGE MONITORING IC WITH WATCHDOG TIMER
logo
Cypress Semiconductor
MB3793-42 CYPRESS-MB3793-42 Datasheet
293Kb / 24P
   Power-Voltage Monitoring IC with Watchdog Timer
logo
Fujitsu Component Limit...
MB3793-37A FUJITSU-MB3793-37A_06 Datasheet
259Kb / 24P
   Power Voltage Monitoring IC with Watchdog Timer
MB3793-42 FUJITSU-MB3793-42 Datasheet
266Kb / 25P
   POWER-VOLTAGE MONITORING IC WITH WATCHDOG TIMER
logo
Cypress Semiconductor
MB3793-27D CYPRESS-MB3793-27D Datasheet
793Kb / 24P
   Power-Voltage Monitoring IC with Watchdog Timer
logo
Fujitsu Component Limit...
MB3793-37A FUJITSU-MB3793-37A Datasheet
150Kb / 21P
   Power Voltage Monitoring IC with Watchdog Timer
MB3793-27A FUJITSU-MB3793-27A Datasheet
305Kb / 25P
   Power Voltage Monitoring IC with Watchdog Timer
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