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X40420 Datasheet(PDF) 1 Page - Intersil Corporation

Part No. X40420
Description  Dual Voltage Monitor with Integrated CPU Supervisor and System Battery Switch
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Maker  INTERSIL [Intersil Corporation]
Homepage  http://www.intersil.com/cda/home
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X40420 Datasheet(HTML) 1 Page - Intersil Corporation

 
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1
®
FN8117.1
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. 2005-2006. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
PRELIMINARY
X40420, X40421
4kbit EEPROM
Dual Voltage Monitor with Integrated CPU
Supervisor and System Battery Switch
FEATURES
• Dual voltage detection and reset assertion
—Three standard reset threshold settings
(4.6V/2.9V, 4.6V/2.6V, 2.9V/1.6V)
—VTRIP2 programmable down to 0.9V
—Adjust low voltage reset threshold voltages
using special programming sequence
—Reset signal valid to VCC = 1V
—Monitor two voltages or detect power fail
• Battery switch backup
•VOUT: 5mA to 50mA from VCC; or 250µA from
VBATT
• Fault detection register
• Selectable power-on reset timeout
(0.05s, 0.2s, 0.4s, 0.8s)
• Selectable watchdog timer interval
(25ms, 200ms, 1.4s, off)
• Debounced manual reset input
• Low power CMOS
—25µA typical standby current, watchdog on
—6µA typical standby current, watchdog off
—1µA typical battery current in backup mode
• 4Kbits of EEPROM
—16 byte page write mode
—Self-timed write cycle
—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 Ld SOIC, TSSOP
• Pb-free plus anneal available (RoHS compliant)
• Monitor voltages: 5V to 1.6V
• Memory security
• Battery switch backup
•VOUT 5mA to 50mA
APPLICATIONS
• Communications equipment
—Routers, hubs, switches
—Disk arrays
• Industrial systems
—Process control
—Intelligent instrumentation
• Computer systems
—Desktop computers
—Network servers
X40420, X40421
DESCRIPTION
The X40420, X40421 combines power-on reset con-
trol, watchdog timer, supply voltage supervision, and
secondary 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.
BLOCK DIAGRAM
Standard VTRIP1 Level Standard VTRIP2 Level Suffix
4.6V (±1%)
2.9V(±1.7%)
-A
4.6V (±1%)
2.6V (±2%)
-B
2.9V(±1.7%)
1.6V (±3%)
-C
See “Ordering Information” for more details
For Custom Settings, call Intersil.
V2FAIL
WDO
MR
LOWLINE
RESET
RESET
X40420
X40421
+
-
V2 Monitor
Logic
VTRIP2
Fault Detection
Register
Status
Register
EEPROM
Array
Data
Register
Command
Decode Test
& Control
Logic
Power-on,
Manual Reset
Low Voltage
Reset
Generation
VCC Monitor
Logic
V2MON
SDA
WP
SCL
VCC
(V1MON)
Watchdog
and
Reset Logic
System
Switch
Battery
VBATT
VOUT
BATT-ON
+
-
VTRIP1
VOUT
VOUT
VOUT
Data Sheet
May 25, 2006


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