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PDF LTC4304 Data sheet ( Hoja de datos )

Número de pieza LTC4304
Descripción Hot Swappable 2-Wire Bus Buffer
Fabricantes Linear 
Logotipo Linear Logotipo



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No Preview Available ! LTC4304 Hoja de datos, Descripción, Manual

FEATURES
Automatic Disconnect of SDA/SCL Lines when Bus
is Stuck Low for ≥30ms
Fault Flag for Stuck Bus
Recovers Stuck Busses with Automatic Clocking*
Bidirectional Buffer* for SDA and SCL Lines
Increases Fanout
Prevents SDA and SCL Corruption During Live
Board Insertion and Removal from Backplane
Allows Bus Pullup Voltages Above and Below VCC
±15kV Human Body Model ESD Protection
Isolates Input SDA and SCL Lines from Output
Compatible with I2CTM, I2C Fast-Mode and SMBus
Standards (Up to 400kHz Operation)
READY Open Drain Output
1V Precharge on All SDA and SCL Lines
High Impedance SDA, SCL Pins for VCC = 0V
ENABLE Gates Connection from Input to Output
MSOP
10-Pin
and DFN
U
(3mm
×
3mm)
Packages
APPLICATIO S
Hot Board Insertion
Servers
Capacitance Buffer/Bus Extender
RAID Systems
LTC4304
Hot Swappable 2-Wire
Bus Buffer with Stuck
Bus Recovery
DESCRIPTIO
The LTC®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 ≥30ms (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 LTC4304’s rise-time accelerators. A logic high on ACC
disables the rise-time accelerators, which allows SDA and
SCL bus pull-up voltages below VCC.
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.
, 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.
TYPICAL APPLICATIO
5V 3.3V
10k 10k
BACK_SCL
BACK_SDA
3.3V
SCLIN
VCC
LTC4304
0.01µF
SCLOUT
10k 10k
CARD_SCL
SDAIN
SDAOUT
FAULT
ENABLE
100k
GND
READY
ACC
4304 TA01
CARD_SDA
SDAOUT
5V/DIV
SDAIN
5V/DIV
SCLOUT
5V/DIV
FAULT
5V/DIV
BACKPLANE STAGGERED
CONNECTOR CONNECTOR
CARD
Stuck Bus Resolved with
Automatic Clocking
STUCK LOW > 30ms
RECOVERS
DISCONNECT AT TIMEOUT
AUTOMATIC CLOCKING
200ms/DIV
4304 TA01b
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LTC4304 pdf
LTC4304
PI FU CTIO S
ENABLE (Pin 1): Connection Enable. This is a digital
threshold input pin. For normal operation ENABLE is high.
Driving ENABLE below 0.8V isolates SDAIN from SDAOUT,
SCLIN from SCLOUT, asserts READY low and disables
automatic clocking. A rising edge on ENABLE after a fault
has occurred unconditionally forces a connection between
SDAIN, SDAOUT and SCLIN, SCLOUT.
SCLOUT (Pin 2): Serial Clock Output. Connect this pin to
the SCL bus on the card.
SCLIN (Pin 3): Serial Clock Input. Connect this pin to SCL
on the bus backplane.
ACC (Pin 4): Rise-Time Accelerator Control. Connect ACC
to VCC to disable all four accelerators. Connect ACC to
GND to enable all four accelerators. Float ACC to enable
the SDAOUT and SCLOUT accelerators only. For applica-
tions when VCC is greater than the bus pull-up voltage,
connect ACC to VCC.
GND (Pin 5): Device Ground. Connect this pin to a ground
plane for best results.
READY (Pin 6): Connection Status Flag. READY provides
a digital flag which indicates the status of the connection
circuitry described in the “Connection Circuitry” section.
Connect a resistor of 10k to VCC to provide the pull-up.
FAULT (Pin 7): Bus Stuck Low Fault. FAULT is an open
drain N-channel MOSFET which pulls low to signal a bus
stuck low condition. In normal operation, FAULT is high.
Connect a 10k resistor from this pin to VCC to provide
the pull-up.
SDAIN (Pin 8): Serial Data Input. Connect this pin to the
SDA bus on the backplane.
SDAOUT (Pin 9): Serial Data Output. Connect this pin to
the SDA bus on the card.
VCC (Pin 10): Supply Voltage Input. Place a bypass capaci-
tor of at least 0.01µF close to VCC for best results.
Exposed Pad (Pin 11, DFN Only): Exposed pad may be
left open or connected to the ground plane.
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LTC4304 arduino
LTC4304
APPLICATIONS INFORMATION
Figure 4 shows the LTC4304 in a PCI application where all
of the pins have the same length. In this case, a RC filter
circuit on the I/O card with a product of 10ms provides a
filter to prevent the LTC4304 from becoming activated until
the transients associated with live insertion have settled.
Connect the capacitor between ENABLE and GND, and the
resistor from VCC to ENABLE.
BACKPLANE
VCC
R1 R2
10k 10k
SDA
SCL
BACKPLANE
CONNECTOR
R3
100k
C2
0.1µF
I/O PERIPHERAL CARD 1
ENABLE
SDAIN
SCLIN
ACC
C1
0.01µF
R4 R5 R6 R11
10k 10k 10k 10k
VCC SDAOUT
CARD1_SDA
LTC4304
SCLOUT
READY
CARD1_SCL
GND FAULT
R7
100k
C4
0.1µF
I/O PERIPHERAL CARD 2
ENABLE
SDAIN
SCLIN
ACC
C3
0.01µF
R8 R9 R10 R12
10k 10k 10k 10k
VCC
LTC4304
SDAOUT
SCLOUT
READY
CARD2_SDA
CARD2_SCL
GND FAULT
Figure 4. Inserting Multiple I/O Cards into a Live Backplane Using the LTC4304 in a PCI System
4304 F04
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