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2- & 4-Channel Hot Swap™ I2C Multiplexers Provide Capacitive Buffering
MILPITAS, CA - December 15, 2010 - Linear Technology Corporation
introduces the LTC4312 and
LTC4314 2-wire bus
multiplexers, which provide individual enable pins to connect an
upstream I2C bus to any combination of downstream busses or cards.
The LTC4312 and LTC4314 are pin-selectable multiplexers with bus
buffers that reduce component count while promoting ideal I2C
signal integrity. The LTC4312 multiplexes two channels, while the
LTC4314 multiplexes four channels. These devices allow easy I2C
address expansion, providing the ability to address one of multiple
identical devices, thus resolving address conflict issues.
Bidirectional capacitive buffering allows extension of the I2C bus
size well beyond the 400pF I2C bus specification and prevents I2C
signal corruption during live board insertion or removal.
The LTC4312 and LTC4314 are suitable for a wide range of
applications, including radial architectures in telecommunications
systems such as ATCA, address expansion and level translators. Many
I2C and SMBus devices operate at different supply voltage levels,
yet must communicate in the same application. The LTC4312 and
LTC4314 support level translation for bus voltages ranging from
1.5V to 5.5V, providing the ability to power devices from different
supply voltages while maintaining fully bidirectional
communications between all devices in the system. Bidirectional
buffering keeps backplane and card capacitances isolated, while
maintaining low offsets and high noise margins up to 0.3VCC. In
addition, built-in rise time accelerators provide strong pull-up
currents on SCL and SDA rising edges to meet I2C rise time
specifications for heavily loaded busses; the strength of these
accelerators can be selected or disabled completely. Safety
measures include a stuck bus disconnect and recovery feature to
disengage the input from all enabled output channels and issue
clocks to the stuck device, a fault output to signal when the host
a bus is stuck low, and ±4kV HBM ESD protection for increased
ruggedness.
The LTC4312 is available in 14-lead 4mm x 3mm DFN and 16-lead SSOP
packages, and the LTC4314 is available in 20-lead 3mm x 4mm QFN and
20-lead SSOP packages. Offered over the commercial and industrial
temperature ranges, pricing for the LTC4312 and LTC4314 starts at
$1.95 and $2.65 each, respectively for 1000-piece quantities. For
more information, visit www.linear.com/4312 and www.linear.com/4314.
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Summary of Features: LTC4312-14
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1:4 I2C Multiplexer with Capacitive Buffering, |
