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X45620 Datasheet(PDF) 1 Page - Intersil Corporation

Part No. X45620
Description  Dual Voltage Monitor with Integrated System Battery Switch and EEPROM
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Maker  INTERSIL [Intersil Corporation]
Homepage  http://www.intersil.com/cda/home
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X45620 Datasheet(HTML) 1 Page - Intersil Corporation

 
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1
®
FN8250.0
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.
X45620
Dual Voltage Monitor with Integrated
System Battery Switch and EEPROM
FEATURES
• Dual voltage monitoring
• Active low reset outputs
• Two standard reset threshold voltages
—Factory programmable threshold
• Lowline Output — zero delayed POR
• Reset signal valid to VCC = 1V
• System battery switch-over circuitry
• Selectable watchdog timer
—(0.15s, 0.4s, 0.8s, off)
• 256Kbits of EEPROM
• Built-in inadvertent write protection
—Power-up/power-down protection circuitry
—Protect 0, 1/4, 1/2 or all of EEPROM array with
programmable Block Lockprotection
—In circuit programmable ROM mode
• Minimize EEPROM programming time
—64 byte page write mode
—Self-timed write cycle
—5ms write cycle time (typical)
• 400kHz 2-wire Interface
• 2.7V to 5.5V power supply operation
• Available package — 20-lead TSSOP
• Dual supervisor
• Battery switch and output
DESCRIPTION
The Intersil X45620 combines power-on reset control,
battery switch circuit, watchdog timer, supply voltage
supervision, secondary voltage supervision, block lock
protect and serial EEPROM in one package. This
combination lowers system cost, reduces board space
requirements, and increases reliability.
Applying power to the device activates the power-on
reset circuit which holds RESET active for a period of
time. This allows the power supply and oscillator to
stabilize before the processor can execute code.
A system battery switch circuit compares VCC (V1MON)
with VBATT input and connects VOUT to whichever is
higher. This provides voltage to external SRAM or other
circuits in the event of main power failure. The X45620
can drive 50mA from VCC and 250µA from VBATT. The
device switches to VBATT when VCC drops below the
low VCC voltage threshold and VBATT > VCC.
BLOCK DIAGRAM
Watchdog
Timer Reset
Data
Register
Command
Decode, Test
& Control
Logic
SDA
SCL
VCC
Reset &
Watchdog
Timebase
Power-on,
Generation
VCC Monitor
+
-
Reset
Low Voltage
Status
Register
Protect Logic
EEPROM
Watchdog Transition
Detector
WP
512 X 512
VTRIP1
Logic
V2 Monitor
+
-
VTRIP2
Logic
System
Switch
RESET/MR
LOWLINE
V2FAIL
V2MON
VBATT
VOUT
(V1MON)
Battery
Array
Device
Select
Logic
S0
S1
BATT-ON
WDO
VOUT
VOUT
(32K X 8 Bit)
Data Sheet
July 29, 2005


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