Accelerator compensates for heavily loaded buses
Linear Technology
LTC4311
Uses a boosted pull-up current during rising bus transitions, and disables current sources during falling transitions.
New from Linear Technology, the LTC4311 is a rise-time accelerator IC for heavily loaded I2C/SMBus systems operating at up to 400kHz.
The LTC4311 offers improvements over existing accelerator products with its wide supply voltage range, low-power shutdown mode, strong pull-up current, tight bus holdoff threshold, voltage improved ESD ruggedness and reduced package size.
Systems where multiple devices are connected to the same bus can exhibit high bus capacitance well beyond the 400pF I2C specification.
The capacitive loading causes slow rise times that can affect data reliability and dictate the maximum practical speed of the bus.
The LTC4311 alleviates these issues by using a boosted pull-up current during rising bus transitions, and disables current sources during falling transitions and during logic lows and logic highs for improved low state noise margins.
The LTC4311 is ideal for portable applications, including cameras, notebook computers and full-featured cellphones.
The LTC4311 is capable of operating from supply voltages as low as 1.6V and as high as 5.5V.
It provides an enable pin for a low current shutdown of less than 5uA, with no bus loading during shutdown or when powered down.
The LTC4311 automatically detects the bus idle state and reduces supply current to only 26uA in standby mode.
For additional reliability, the LTC4311 survives +/-8kV human body model ESD on its pins.
Specified over the commercial and industrial temperature ranges, the LTC4311 is offered in tiny 2 x 2mm 6-pin DFN and SC70 packages.
Available today, pricing begins at US $1.55 in 1000 piece quantities.
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