LTC4302-1/LTC4302-2
1
sn430212 430212fs
APPLICATIO S
FEATURES
TYPICAL APPLICATIO
DESCRIPTIO
The LTC
?/DIV>
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/LTC4302-2s 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
Live Board Insertion
s
5V/3.3V Level Translator
s
Servers
s
Capacitance Buffer/Bus Extender
s
Nested Addressing
, LTC and LT are registered trademarks of Linear Technology Corporation.
s
Bidirectional Buffer for SDA and SCL Lines
Increases Fanout
s
Connect SDA and SCL Lines with 2-Wire Bus
Commands
s
Prevents SDA and SCL Corruption During Live Board
Insertion and Removal from Backplane
s
Compatible with I
2
C
TM
Standard Mode, I
2
C Fast
Mode and SMBus Standards
s
Rise Time Accelerators on SDA, SCL Lines
s
1V Precharge on SDA and SCL Lines
s
32 Unique Addresses from a Single ADDRESS Pin
s
Two General Purpose Inputs-Outputs (LTC4302-1)
s
Translates Between 5V and 3.3V Systems
(LTC4302-2)
s
Small 10-Pin MSOP Package
Addressable
2-Wire Bus Buffers
V
CC
LTC4302-1
SDAIN
C1
0.01礔
CARD SDA
CARD SCL
R7
10k
R6
10k
R8
1k
R9
1k
2.7V
to
5.5V
R3
10k
R4
10k
R5
10k
R1
1870&
R2
2000&
SDA
SCL
SCLIN
CONN
ADDRESS
GND
LED
LED
4203 TA01a
SDAOUT
SCLOUT
GPIO1
GPIO2
I
2
C is a trademark of Philips Electronics N.V.
*U.S. Patent No. 6,650,174
4032 F10
OUTPUT
SIDE
50pF
INPUT
SIDE
150pF
Input-Output Connection t
PLH
0.1祍/DIV
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