LTC4304
1
4304fa
Hot Swappable 2-Wire
Bus Buffer with Stuck
Bus Recovery
The LTC
?/DIV>
4304 hot swappable 2-wire bus buffer allows I/O
card insertion into a live backplane without corruption of
the data and clock busses. When a connection is made,
the LTC4304 provides bidirectional buffering, keeping the
backplane and card capacitances isolated. If SDAOUT or
SCLOUT is low for e30ms (typ), the LTC4304 automatically
breaks the data and clock bus connection and
FAULT
will
pull low. At this time the LTC4304 automatically generates
up to 16 clock pulses on SCLOUT in an attempt to free the
bus. A connection will be enabled automatically when the
bus becomes free. A logic low on the ACC input enables
the LTC4304s rise-time accelerators. A logic high on ACC
disables the rise-time accelerators, which allows SDA and
SCL bus pull-up voltages below V
CC
.
During insertion, the SDA and SCL lines are precharged
to 1V to minimize bus disturbances. When driven high,
ENABLE allows the LTC4304 to connect after a stop bit or
bus idle occurs. Driving ENABLE low breaks the connection
between SDAIN and SDAOUT, SCLIN and SCLOUT. READY
is an open drain output that indicates when the backplane
and card sides are connected together.
?/DIV>
Automatic Disconnect of SDA/SCL Lines when Bus
is Stuck Low for e30ms
?/DIV>
Fault Flag for Stuck Bus
?/DIV>
Recovers Stuck Busses with Automatic Clocking*
?/DIV>
Bidirectional Buffer* for SDA and SCL Lines
Increases Fanout
?/DIV>
Prevents SDA and SCL Corruption During Live
Board Insertion and Removal from Backplane
?/DIV>
Allows Bus Pullup Voltages Above and Below V
CC
?/DIV>
?5kV Human Body Model ESD Protection
?/DIV>
Isolates Input SDA and SCL Lines from Output
?/DIV>
Compatible with I
2
C
TM
, I
2
C Fast-Mode and SMBus
Standards (Up to 400kHz Operation)
?/DIV>
READY Open Drain Output
?/DIV>
1V Precharge on All SDA and SCL Lines
?/DIV>
High Impedance SDA, SCL Pins for V
CC
= 0V
?/DIV>
ENABLE Gates Connection from Input to Output
?/DIV>
MSOP 10-Pin and DFN (3mm ?/SPAN> 3mm) Packages
?/DIV>
Hot Board Insertion
?/DIV>
Servers
?/DIV>
Capacitance Buffer/Bus Extender
?/DIV>
RAID Systems
CARD
100k
ENABLE
FAULT
CARD_SCL
CARD_SDA
SCLOUT
SCLIN
SDAOUT
READY
SDAIN
GND
V
CC
LTC4304
ACC
0.01礔
4304 TA01
10k 10k
10k
10k
5V
BACK_SCL
BACKPLANE
CONNECTOR
BACK_SDA
3.3V
3.3V
STAGGERED
CONNECTOR
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents including 6356140, 6650174, 7032051.
SDAOUT
5V/DIV
SCLOUT
5V/DIV
FAULT
5V/DIV
200
s/DIV
STUCK LOW > 30ms
RECOVERS
DISCONNECT AT TIMEOUT
AUTOMATIC CLOCKING
4304 TA01b
SDAIN
5V/DIV
Stuck Bus Resolved with
Automatic Clocking
FEATURES
DESCRIPTIO
TYPICAL APPLICATIO
APPLICATIO S
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