Hot swap I2C multiplexers provide capacitive buffering supercapacitors
December 16, 2010 // Paul Buckley
Linear Technology Corporation has introduced 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 400 pF 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 supports level translation for bus voltages ranging from 1.5 V to 5.5 V. The devices provide 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 0.3 VCC. 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 ±4 kV HBM ESD protection for increased ruggedness.
Availability and Pricing
The LTC4312 is available in 14-lead 4 mm x 3 mm DFN and 16-lead SSOP packages, and the LTC4314 is available in 20-lead 3 mm x 4 mm 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
London Calling: ST's Bozotti seeks another term
May 24, 2013
Carlo Bozotti, chief executive officer, of ST was taking questions during a financial and media analysts' day held in London ...
Miniature self-charging tracking device generates its own radio signal
Time for a new UI programming paradigm
Brussels Calling: Qualcomm wins in a wasteful industry
Europe in 10 billion € bid to boost chip industry
Nujira surpasses own world record for ET PA linearity
May 23, 2013
Nujira will present new performance results at the IEEE MTT International Microwave Symposium (IMS) in Seattle, USA that ...
Silica moves to fast lane in Europe's LED market
Intel's new CEO shakes things up
Wide-angle lens is less than 3mm high for the same diameter
InterviewSilica moves to fast lane in Europe's LED market
In the booming market for LED lighting, electronics distributor Silica intends to lead the pack by offering technological excellence at application level. The company is currently planning to offer tailor-made ...
Filter WizardCheck out the Filter Wizard Series of articles by Filter Guru Kendall Castor-Perry which provide invaluable practical Analog Design guidelines.
Linear video channel
READER OFFERRead more
The development platform for i.MX 6Quad from element14 (built to the Freescale SABRE Lite design) is an evaluation platform featuring the powerful i.MX 6Q, a multimedia application processor with Quad ARM Cortex-A9 cores at 1.2 GHz from Freescale Semiconductor.
This month, Freescale and element14 are giving away five such platforms, worth £128.06 each, for EETimes Europe's readers to win. The platform helps evaluate the rich set of peripherals and includes a 10/100/Gb Ethernet port, SATA-II, HDMI v1.4, LVDS, parallel RGB interface, touch screen interface, analog headphone/microphone, micro TF and SD card interface, USB, serial port, JTAG, camera interface, and input keys for Android.
And the winners are...
In our previous reader offer, Pico Technology was giving away one of its recently launched PicoScope 3207B, a 2-channel USB 3.0 oscilloscope worth 1451 Euros. Lucky winner Mr L. Sanchez-Gonzalez from Spain should be receiving his PicoScope 3207B soon. Let's wish them some interesting findings with his projects.
December 15, 2011 | Texas instruments | 222901974
Unique Ser/Des technology supports encrypted video and audio content with full duplex bi-directional control channel over a single wire interface.