參數(shù)資料
型號(hào)： X45620V20I
廠(chǎng)商： INTERSIL CORP
元件分類(lèi)： 電源管理
英文描述： Dual Voltage Monitor with Integrated System Battery Switch and EEPROM
中文描述： 2-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO20
封裝： TSSOP-20
文件頁(yè)數(shù)： 1/20頁(yè)
文件大?。?/td> 370K
代理商： X45620V20I
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 V
CC
= 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 Lock
protection
—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 V
CC
(V1MON)
with V
BATT
input and connects V
OUT
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 V
CC
and 250μA from V
BATT
. The
device switches to V
BATT
when V
CC
drops below the
low V
CC
voltage threshold and V
BATT >
V
CC
.
BLOCK DIAGRAM
Watchdog
Timer Reset
Data
Register
Command
Decode, Test
& Control
Logic
SDA
SCL
V
CC
Reset &
Watchdog
Timebase
Power-on,
Low Voltage
Generation
V
CC
Monitor
Logic
+
V
TRIP1
-
Reset
Status
Register
Protect Logic
EEPROM
Array
Watchdog Transition
Detector
WP
512 X 512
(32K X 8 Bit)
A
VLogic
+
V
TRIP2
-
System
Battery
Switch
RESET/MR
LOWLINE
V2FAIL
V2MON
V
BATT
V
OUT
(V1MON)
Device
Select
Logic
S0
S1
BATT-ON
WDO
V
OUT
V
OUT
Data Sheet
July 29, 2005
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