LTC490CN8#PBF

Drivers, Receivers, Transceivers Overview

The LTC490CN8#PBF is a low-power differential driver and receiver pair designed for multipoint data transmission in RS485 applications, while also meeting RS422 requirements. It operates on a single 5V supply with a typical supply current of 300mA. The device features an extended bus common mode range from –7V to 12V, allowing for ground differences between devices. Key electrical parameters include a typical driver propagation delay of 28ns with 5ns skew at 2.5MB operation, 70mV typical input hysteresis, and a combined impedance supporting up to 32 transceivers on the bus. It is housed in an 8-lead PDIP package.

Drivers, Receivers, Transceivers Feature Summary

• Thermal shutdown protection prevents excessive power dissipation by forcing driver outputs into a high impedance state during faults.
• Power-up and power-down glitch-free driver outputs permit live insertion or removal of packages without data corruption.
• Fail-safe receiver feature guarantees a high output state when inputs are left open, ensuring defined logic levels.

Drivers, Receivers, Transceivers Applications

• Multipoint data transmission systems adhering to RS485 standards
• Point-to-point communication links compliant with RS422 specifications
• Industrial bus networks requiring extended common mode voltage ranges

Drivers, Receivers, Transceivers Procurement Notes

Verify the specific suffix CN8 corresponds to the commercial temperature range (0°C to 70°C) and the 8-lead PDIP package configuration. Confirm that the #PBF designation indicates lead-free compliance and halogen-free status as per manufacturer standards. Ensure the ordering information matches the required pinout and mechanical dimensions for the target PCB layout.

Drivers, Receivers, Transceivers Selection Notes

Select this component for applications requiring robust fault protection and low power consumption in standard 5V environments. Consider the LTC491 if active driver disable functionality is needed, as the LTC490 driver outputs are always enabled. Evaluate cable length and data rate constraints using the provided attenuation guidelines to ensure signal integrity over the intended transmission distance.

Drivers, Receivers, Transceivers Part Context

The LTC490 belongs to Analog Devices' family of low-power RS485/RS422 transceivers. It serves as a cost-effective solution for industrial communication where thermal stability and glitch-free operation are critical. The device is pin-compatible with legacy bipolar counterparts like the SN75179, facilitating easier upgrades to CMOS technology for improved power efficiency.

Drivers, Receivers, Transceivers Replacement Considerations

The LTC491 is a related part offering driver enable control. For higher speed requirements, consider the LTC1686/LTC1687 which are pin-compatible full-duplex options. The LTC1481 offers lower power consumption but lacks the extended common mode range. Verify pin compatibility and electrical specifications before substituting.