SN55LBC173TDA2

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Interface – Drivers, Receivers, Transceivers

The SN55LBC173TDA2 is a dual-level, low-power, low-voltage CMOS full-duplex transceiver that includes two drivers, two receivers, one direction controlling circuit and one status output. The device has been designed as a voltage-level translator, providing compatibility between slower logic, such as a bus-holding driver to drive a ½ H driver, while also providing less than 1 mA power consumption.

Application Field of SN55LBC173TDA2

The SN55LBC173TDA2 can be used for data transmission between two voltage levels, typically 3V and 5V. It is primarily an interface circuit with applications including full-duplex RS-232, half-duplex TTL, RS422/RS485 protocols, address and data bus translation, bus management and other serial communication. It can also be used to connect two circuits when one requires a higher supply voltage than the other. It has been designed for operation in the extended ambient temperature range.

Working Principle of SN55LBC173TDA2

The SN55LBC173TDA2\'s direction control signal is used to select direction. It is activated by logic high (5V) to enable the high voltage driver, while logic low (3V) enables the low-voltage driver. When using the SN55LBC173TDA2 to translate between 3V/5V or 5V/3V, it is necessary to select the proper driver by applying the appropriate direction control signal. On power up, it should be noted that the device will remain in its last state.

The two level drivers on the SN55LBC173TDA2 module will allow it to drive any compatible logic, such as the five-volt logic used in the ½ H bus, which is often used in the control circuit of systems such as motor control, industrial automation, or robotics. It ensures that the output voltage level is always compatible with the level of the connected device. It can also drive loads with variable current up to 10 mA and loads up to 100 pF.

The receivers of the SN55LBC173TDA2 incorporate Schmitt trigger protection circuitry to prevent noise pulses from affecting the receivers. The receive pins feature a low-power Schmitt trigger with reverse-biased photo-coupler protection. This provides a robust level-shifter with over-voltage protection, and is capable of withstanding a voltage differential of ±10 V.

The SN55LBC173TDA2 is controlled by two enable inputs. When Enabled, the two enable inputs enable the drivers and receivers. When Disable is selected, the drivers and receivers remain disabled and the module will not draw power.

Conclusion

The SN55LBC173TDA2 is a dual-level, low-power, low-voltage CMOS full-duplex transceiver. Its application field includes full-duplex RS-232, half-duplex TTL, RS422/RS485 protocols, address and data bus translation, bus management and other serial communication. It utilizes two drivers, two receivers, one direction control circuit and one status output to allow data transmission between two voltage levels, typically 3V and 5V. Its Schmitt trigger protection circuitry ensures robust level-shifter with over-voltage protection as well as its two enable inputs for drivers and receivers.

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