Hot-selling and scarce TCA9548APWR Low-Voltage 8-Channel I2C Switch with Reset 24-TSSOP spot stock

Product Descriptions

The   TCA9548A    device    has    eight    bidirectionaltranslating  switches  that  can  be  controlled  throughthe I2 C bus . The SCL/SDA upstream pair fans out toeight downstream pairs, or channels . Any individualSCn/SDn  channel  or  combination  of  channels  canbe  selected,  determined   by  the  contents  of  theprogrammable  control  register.  These  downstreamchannels can be used to resolve I2 C target addressconflicts .   For   example,   if   eight   identical   digitaltemperature sensors  are  needed  in the  application,one sensor can be connected at each channel: 0-7.

The system controller can reset the TCA9548A in theevent of a time-out, or other improper operation  byasserting  a  low  in  the  RESET  input .  Similarly,  thepower-on reset deselects all channels and initializesthe   I2 C/SMBus  state   machine .  Asserting   RESETcauses  the  same  reset  and  initialization  to  occurwithout powering down the part . This allows recoveryif one of the downstream I2 C buses get stuck in a lowstate .

The  pass gates of the switches are constructed sothat the VCC pin can be used to limit the maximumhigh  voltage,  which  is  passed  by  the  TCA9548A .Limiting the maximum high voltage allows the use ofdifferent bus voltages on each pair, so that 1.8V, 2.5Vor 3.3V parts can communicate with 5V parts, withoutany  additional  protection .  External  pullup  resistorspull the bus up to the desired voltage level for eachchannel .All I/O pins are 5V tolerant .

Product Features

•    1-to-8 Bidirectional translating switches

•    I2 C Bus and SMBus compatible

•   Active-low reset input

•   Three address pins, allowing up to eight TCA9548A devices on the I2 C bus

•    Channel selection through an I2 C Bus, in any combination

•    Power up with all switch channels deselected

•    Low R ON switches

•   Allows voltage-level translation between 1.8V, 2.5V, 3.3V, and 5V buses

•    No glitch on power up

•   Supports hot insertion

•    Low standby current

•    Operating power-supply voltage range of 1.65V to 5.5V

•   5-V Tolerant inputs

•   0 to 400kHz Clock frequency

•    Latch-up performance exceeds 100mA Per JESD 78, class II

•    ESD Protection exceeds JESD 22

–   ±2000V Human-body model (A114-A)

–   200V Machine model (A115-A)

–   ±1000V Charged-device model (C101)

Product Applications

•    Servers

•    Routers (telecom switching equipment)

•    Factory Automation

•    Products with I2 C target address conflicts (such as multiple, identical temperature sensors)

Product Specifications

Product Photos

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