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LTC4302IMS-2 Datasheet

  • LTC4302IMS-2

  • Addressable 2-Wire Bus Buffers

  • 20頁

  • LINER

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FEATURES
s
s
LTC4302-1/LTC4302-2
Addressable
2-Wire Bus Buffers
DESCRIPTIO
The LTC
廬
4302-1/LTC4302-2 addressable I
2
C bus and
SMBus compatible bus buffers allow a peripheral board
to be inserted and removed from a live backplane without
corruption of the bus. The LTC4302-1/LTC4302-2 main-
tain electrical isolation between the backplane and periph-
eral board until their V
CC
supply is valid and a master
device on the backplane side addresses the LTC4302-1/
LTC4302-2 and commands them to connect. The
LTC4302-1/LTC4302-2鈥檚 ADDRESS pin provides 32 pos-
sible addresses set by an external resistive divider be-
tween V
CC
and GND. The LTC4302-1/LTC4302-2 work
with supply voltages ranging from 2.7V to 5.5V. The SDA
and SCL inputs and outputs do not load the bus lines when
V
CC
is low.
Rise time accelerator circuitry* allows for heavier capaci-
tive bus loading while still meeting system timing require-
ments. During insertion, the SDA and SCL lines are
precharged to 1V to minimize bus disturbances. Two
general purpose input/output pins (GPIOs) on the
LTC4302-1 can be configured as inputs, open-drain out-
puts or push-pull outputs. The LTC4302-2 option replaces
one GPIO pin with a second supply voltage pin V
CC2
,
providing level shifting between systems with different
supply voltages. The LTC4302-1/LTC4302-2 are available
in a 10-pin MSOP package.
s
s
s
s
s
s
s
s
Bidirectional Buffer for SDA and SCL Lines
Increases Fanout
Connect SDA and SCL Lines with 2-Wire Bus
Commands
Prevents SDA and SCL Corruption During Live Board
Insertion and Removal from Backplane
Compatible with I
2
C
TM
Standard Mode, I
2
C Fast
Mode and SMBus Standards
Rise Time Accelerators on SDA, SCL Lines
1V Precharge on SDA and SCL Lines
32 Unique Addresses from a Single ADDRESS Pin
Two General Purpose Inputs-Outputs (LTC4302-1)
Translates Between 5V and 3.3V Systems
(LTC4302-2)
Small 10-Pin MSOP Package
APPLICATIO S
s
s
s
s
s
Live Board Insertion
5V/3.3V Level Translator
Servers
Capacitance Buffer/Bus Extender
Nested Addressing
, LTC and LT are registered trademarks of Linear Technology Corporation.
I
2
C is a trademark of Philips Electronics N.V.
*U.S. Patent No. 6,650,174
TYPICAL APPLICATIO
2.7V
to
5.5V
R3
10k
R4
10k
R1
1870鈩?/div>
R2
2000鈩?/div>
V
CC
LTC4302-1
SDA
CARD SDA
SDAIN SDAOUT
SCL
CARD SCL
SCLOUT
SCLIN
CONN
ADDRESS GPIO2
GPIO1
GND
R5
10k
C1
0.01碌F
R6
10k
R7
10k
R8
1k
R9
1k
OUTPUT
SIDE
50pF
LED
LED
4203 TA01a
U
U
U
Input-Output Connection t
PLH
INPUT
SIDE
150pF
0.1碌s/DIV
4032 F10
sn430212 430212fs
1

LTC4302IMS-2 產(chǎn)品屬性

  • LTC4302-1/2

  • 50

  • 集成電路 (IC)

  • PMIC - 熱交換

  • -

  • 熱交換開關(guān)

  • 通用型緩沖器/總線擴(kuò)展器

  • 是

  • -

  • 2.7 V ~ 5.5 V

  • -40°C ~ 85°C

  • 表面貼裝

  • 10-TFSOP，10-MSOP（0.118"，3.00mm 寬）

  • 10-MSOP

  • 管件

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