X40435 Datasheet: (X40430 - X40435) Triple Voltage Monitor





X40435 (X40430 - X40435) Triple Voltage Monitor Datasheet

Part Number X40435
Description (X40430 - X40435) Triple Voltage Monitor
Manufacture Intersil Corporation
Total Page 24 Pages
PDF Download Download X40435 Datasheet PDF

Features: ® X40430, X40431, X40434, X40435 4Kbit EEPROM FN8251.0 Data Sheet July 29, 20 05 Triple Voltage Monitor with Integra ted CPU Supervisor FEATURES • Monitor ing voltages: 5V to 9V • Independent core voltage monitor • Triple voltage detection and reset assertion —Stand ard reset threshold settings. See selec tion table on page 2. —Adjust low vol tage reset threshold voltages using spe cial programming sequence —Reset sign al valid to VCC = 1V —Monitor three s eparate voltages • Fault detection re gister • Selectable power-on reset ti meout (0.05s, 0.2s, 0.4s, 0.8s) • Sel ectable watchdog timer interval (25ms, 200ms, 1.4s or off) • Debounced manua l reset input • Low power CMOS —25 A typical standby current, watchdog on —6µA typical standby current, watch dog off • Memory security www.DataShe et4U.com • 4Kbits of EEPROM —16 byt e page write mode —5ms write cycle ti me (typical) • Built-in inadvertent w rite protection —Power-up/power-down protection circuitry —Block lock protect 0, or 1/2, of EEPROM • 400.

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X40430, X40431, X40434, X40435
® 4Kbit EEPROM
Data Sheet
July 29, 2005
FN8251.0
Triple Voltage Monitor with Integrated
CPU Supervisor
FEATURES
• Monitoring voltages: 5V to 9V
• Independent core voltage monitor
• Triple voltage detection and reset assertion
—Standard reset threshold settings. See selec-
tion table on page 2.
—Adjust low voltage reset threshold voltages
using special programming sequence
—Reset signal valid to VCC = 1V
—Monitor three separate voltages
• Fault detection register
• Selectable power-on reset timeout
(0.05s, 0.2s, 0.4s, 0.8s)
• Selectable watchdog timer interval
(25ms, 200ms, 1.4s or off)
• Debounced manual reset input
• Low power CMOS
—25µA typical standby current, watchdog on
—6µA typical standby current, watchdog off
• Memory security
www.DataSheet4U.com 4Kbits of EEPROM
—16 byte page write mode
—5ms write cycle time (typical)
• Built-in inadvertent write protection
—Power-up/power-down protection circuitry
—Block lock protect 0, or 1/2, of EEPROM
• 400kHz 2-wire interface
• 2.7V to 5.5V power supply operation
• Available packages
—14-lead SOIC, TSSOP
APPLICATIONS
• Communication Equipment
—Routers, Hubs, Switches
—Disk Arrays, Network Storage
• Industrial Systems
—Process Control
—Intelligent Instrumentation
• Computer Systems
— Computers
—Network Servers
DESCRIPTION
The X40430, X40431, X40434, X40435 combines
power-on reset control, watchdog timer, supply voltage
supervision, second and third voltage supervision,
manual reset, and Block Lockprotect serial EEPROM
in one package. This combination lowers system cost,
reduces board space requirements, and increases
reliability.
Applying voltage to VCC activates the power-on reset
circuit which holds RESET/RESET active for a period of
time. This allows the power supply and system oscilla-
tor to stabilize before the processor can execute code.
Low VCC detection circuitry protects the user’s system
from low voltage conditions, resetting the system
when VCC falls below the minimum VTRIP1 point.
RESET/RESET is active until VCC returns to proper
operating level and stabilizes. A second and third volt-
age monitor circuit tracks the unregulated supply to
provide a power fail warning or monitors different
power supply voltage. Three common low voltage
combinations are available. However, Intersil’s unique
circuits allows the threshold for either voltage monitor
to be reprogrammed to meet specific system level
requirements or to fine-tune the threshold for applica-
tions requiring higher precision.
A manual reset input provides debounce circuitry for
minimum reset component count.
The Watchdog Timer provides an independent protec-
tion mechanism for microcontrollers. When the micro-
controller fails to restart a timer within a selectable
time out interval, the device activates the WDO signal.
The user selects the interval from three preset values.
Once selected, the interval does not change, even
after cycling the power.
The memory portion of the device is a CMOS Serial
EEPROM array with Intersil’s Block Lock protection.
The array is internally organized as x 8. The device
features a 2-wire interface and software protocol
allowing operation on an I2C bus.
The device utilizes Intersil’s proprietary Direct Write
cell, providing a minimum endurance of 100,000
cycles and a minimum data retention of 100 years.
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2005. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.

                    
                    






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