LTC490CS8#PBF

Drivers, Receivers, Transceivers Overview

The LTC490CS8#PBF is a low-power differential bus transceiver designed for RS485 and RS422 applications. It operates on a single 5V supply with a typical supply current of 300mA. The device features an extended common mode range from –7V to 12V, allowing for ground differences between devices. It includes thermal shutdown protection and glitch-free driver outputs for live insertion. The C-grade variant supports an operating temperature range of 0°C to 70°C. Packaged in an 8-lead SOIC (S8) surface-mount case, it offers pin compatibility with the SN75179.

Drivers, Receivers, Transceivers Feature Summary

• Extended common mode range permits operation with up to –7V ground difference between devices on the bus.
• Thermal shutdown circuit 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 the package without data corruption.

Drivers, Receivers, Transceivers Applications

• Multipoint data transmission systems adhering to RS485 standards.
• Point-to-point communication links meeting RS422 requirements.
• Line repeater configurations for extending cable length beyond standard limits.

Drivers, Receivers, Transceivers Procurement Notes

Verify that the specific suffix #PBF confirms lead-free and RoHS compliance status as defined by Analog Devices Inc. Ensure the ordering part number matches the required temperature grade; the CS8 designation indicates the commercial grade (0°C to 70°C). Confirm the package type corresponds to the 8-lead plastic small outline format before finalizing procurement orders.

Drivers, Receivers, Transceivers Selection Notes

Select this component when a low-power CMOS solution is required for RS485/RS422 networks. It is suitable for applications needing an extended common mode range to handle significant ground potential differences. Choose this part over bipolar counterparts for reduced power consumption while maintaining ruggedness against overload conditions and ESD damage.

Drivers, Receivers, Transceivers Part Context

The LTC490 is part of Analog Devices' family of low-power RS485/RS422 transceivers. It serves as a cost-effective alternative to older bipolar technologies, offering similar functionality with lower power draw. The device is pin-compatible with industry-standard parts like the SN75179, facilitating direct upgrades in existing designs without requiring layout changes.

Drivers, Receivers, Transceivers Replacement Considerations

Public confirmed substitute part numbers include the LTC1686/LTC1687, which are 52Mbps full-duplex RS485 transceivers explicitly noted as LTC490/LTC491 pin compatible.