XR17C158IV-F

Overview

The XR17C158IV-F is an octal Universal Asynchronous Receiver/Transmitter (UART) integrated circuit designed for PCI bus applications. It features eight independent UART channels, each equipped with a 64-byte FIFO buffer to manage data throughput efficiently. The device supports high-speed serial communication with a maximum data rate of 6.25 Mbps and operates within a supply voltage range of 4.5V to 5.5V. It integrates automatic flow control and IrDA encoder/decoder capabilities, supporting RS485 protocols. Packaged in a 144-LQFP (20x20 mm) surface-mount format, it is suitable for industrial environments operating between -40°C and +85°C.

Feature Summary

• Octal architecture providing eight independent UART channels on a single chip
• Integrated 64-byte transmit and receive FIFO buffers per channel
• Supports automatic hardware flow control and IrDA protocol encoding/decoding
• Compatible with RS485 signaling standards for robust serial communication

Applications

• PCI-based industrial automation controllers requiring multiple serial ports
• Telecommunications equipment utilizing RS485 network interfaces
• Embedded systems needing high-density UART expansion via PCI bus
• IrDA-enabled portable devices connected through PCI expansion slots

Procurement Notes

This component has been officially discontinued by the manufacturer as of June 2022. Verification of authenticity is critical when sourcing from secondary markets, as availability is limited to existing stock. Buyers should confirm the specific revision level and ensure compatibility with replacement components before procurement. Due to the end-of-life status, lead times may vary significantly among distributors.

Selection Notes

Engineers replacing this part should consider the XR17V358IB176-F as a manufacturer-recommended alternative. While the replacement offers enhanced performance with larger FIFOs and PCIe support, pinout and software compatibility must be verified. Designers migrating from this legacy PCI UART should evaluate power consumption differences and ensure that the target system supports the interface requirements of the successor device without significant hardware modifications.

Part Context

The XR17C158 belongs to the MaxLinear XR17C158 series of multi-port UARTs. It was widely used in legacy computing and industrial control systems where PCI expansion was standard. The device represents a transition point in serial interface technology, offering high channel density compared to earlier quad-channel solutions. Its discontinuation reflects the industry shift away from PCI toward modern interconnect standards like PCIe and USB.

Replacement Considerations

The XR17V358IB176-F is the manufacturer-recommended substitute. It provides similar functionality but includes upgraded features such as 256-byte FIFOs and PCIe interface support. Engineers must verify mechanical fitment and electrical compatibility during migration.