LTC490IS8#PBF

Drivers, Receivers, Transceivers Overview

The LTC490IS8#PBF is a low power differential bus transceiver designed for multipoint data transmission standards RS485 and RS422. It features an extended common mode range from –7V to +12V, allowing up to a –7V ground difference between devices on the bus. The device operates from a single 5V supply with a typical supply current of 300mA. It includes thermal shutdown protection that forces driver outputs into a high impedance state during excessive power dissipation. The receiver incorporates a fail-safe feature guaranteeing a logic high output when inputs are open. The component supports data rates up to 2.5MBps with typical propagation delays of 28ns and skew of 5ns.

Drivers, Receivers, Transceivers Feature Summary

• Thermal shutdown circuitry protects against excessive power dissipation by disabling driver outputs.
• Fail-safe receiver design ensures a high output state when differential inputs are left open.
• Glitch-free driver outputs permit live insertion or removal without system disruption.
• Extended common mode voltage range accommodates significant ground differences between connected devices.

Drivers, Receivers, Transceivers Applications

• Multipoint data transmission networks utilizing RS485 standards
• Full duplex communication links requiring RS422 compliance
• Industrial control systems necessitating robust fault protection

Drivers, Receivers, Transceivers Procurement Notes

Verify the specific suffix PBF indicates lead-free and RoHS compliant construction. Confirm the S8 package designation corresponds to the 8-lead plastic small outline format. Ensure the I grade matches the required operating temperature range of –40°C to 85°C for the intended deployment environment.

Drivers, Receivers, Transceivers Selection Notes

Select this component when a low power solution is required for standard RS485 or RS422 buses. It is suitable for applications needing extended common mode ranges beyond standard limits. Consider alternatives if shutdown control or higher data rates exceeding 2.5Mbps are necessary.

Drivers, Receivers, Transceivers Part Context

This part belongs to the LTC490 family of differential drivers and receivers. It serves as a pin-compatible alternative to the SN75179. The manufacturer offers related parts such as the LTC491 for full-duplex configurations and various LTC1xxx series devices offering enhanced speeds or additional features like carrier detect.

Drivers, Receivers, Transceivers Replacement Considerations

The SN75179 is explicitly noted as pin compatible. Other potential replacements within the Analog Devices portfolio include the LTC1686/LTC1687 for higher speed requirements while maintaining pin compatibility.