TCA9548APWR Part Information

Details for TCA9548APWR by Texas Instruments

Electronic & Electrical Components > Semiconductors - ICs > Driver & Interface ICs

Part Description

The TCA9548A device has eight bidirectional translating switches that can be controlled through the I2C bus. The SCL/SDA upstream pair fans out to eight downstream pairs, or channels. Any individual SCn/SDn channel or combination of channels can be selected, determined by the contents of the programmable control register. These downstream channels can be used to resolve I2C slave address conflicts. For example, if eight identical digital temperature sensors are needed in the application, one sensor can be connected at each channel: 0-7. The system master can reset the TCA9548A in the event of a time-out or other improper operation by asserting a low in the RESET input. Similarly, the power-on reset deselects all channels and initializes the I2C/SMBus state machine. Asserting RESET causes the same reset and initialization to occur without powering down the part. This allows recovery should one of the downstream I2C buses get stuck in a low state. The pass gates of the switches are constructed so that the VCC pin can be used to limit the maximum high voltage, which is passed by the TCA9548A. Limiting the maximum high voltage allows the use of different bus voltages on each pair, so that 1.8-V, 2.5V or 3.3-V parts can communicate with 5-V parts, without any additional protection. External pullup resistors pull the bus up to the desired voltage level for each channel. All I/O pins are 5-V tolerant.

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Part Features

  • 0- to 400-kHz Clock Frequency
  • 1-to-8 Bidirectional Translating Switches
  • 5-V Tolerant Inputs
  • Active-Low Reset Input
  • Allows Voltage-Level Translation Between 1.8-V, 2.5-V, 3.3-V, and 5-V Buses
  • Channel Selection Through an I2 C Bus, In Any Combination
  • ESD Protection Exceeds JESD 22
  • I2 C Bus and SMBus Compatible
  • Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II
  • Low RON Switches
  • Low Standby Current
  • No Glitch on Power Up
  • Operating Power-Supply Voltage Range of 1.65 V to 5.5 V
  • Power Up With All Switch Channels Deselected
  • Supports Hot Insertion
  • Three Address Pins, Allowing up to Eight TCA9548A Devices on the I2 C Bus

Part Specifications

IC Interface Type I2C SMBus
Interface Applications Factory Automation Products with I2C Slave Address Conflicts Routers Servers
Supply Voltage Min 1.65V
Supply Voltage Max 5.5V
Interface Case Style TSSOP
No. of Pins 24Pins
Operating Temperature Min -40°C
Operating Temperature Max 85°C
Product Range -
Automotive Qualification Standard -
MSL MSL 1 - Unlimited
SVHC No SVHC (27-Jun-2018)
RoHS Phthalates Compliant Yes
RoHS Compliant

Alternative Part Descriptions

  • I2C SWITCH W/ RESET, 8-CH, TSSOP-24; IC Interface Type:I2C, SMBus; Interface Applications:Factory Automation, Products with I2C Slave Address Conflicts, Routers, Servers; Supply Voltage Min:1.65V; Supply Voltage Max:5.5V; Interface RoHS Compliant: Yes | Newark Electronics
  • 8-channel 1.65- to 5.5-V I2C/SMBus switch with reset & voltage translation | Texas Instruments

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