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TXB0104-Q1: The difference between SN series and TXB series level converters

Part Number: TXB0104-Q1
Other Parts Discussed in Thread: SN74AVC4T245-Q1, TXU0304-Q1, TXU0104-Q1, TXU0204-Q1

May I ask what are the differences between the previous SN74AVC4T245-Q1 and SN54SLC8T245 chips and the current TXB chips?

  • The TXB chips are auto-bidirectional, i.e., the input and output buffers on both sides are always active. To make this work, the output buffers are very weak to allow the other devices to override the voltage. This implies that the TXB cannot be used as a buffer, and does not work with strong pull-up/-down resistors or high capacitive loads (such as long traces/connectors/cables).

    The SN translators work similar to basic '245 transceivers, i.e., they have high-impedance inputs and low-impedance outputs (in the configured direction), and work as buffers.

    In general, for unidirectional signals, you should use unidirectional translators, i.e., TXU0104-Q1/TXU0204-Q1/TXU0304-Q1.