SC16C554IB80,557

Overview

The SC16C554IB80,557 is a quad Universal Asynchronous Receiver and Transmitter (QUART) featuring four independent serial channels. It supports data rates up to 5 Mbit/s at 5 V and 3.3 V, and 3 Mbit/s at 2.5 V. The device includes 16-byte transmit and receive FIFOs with programmable trigger levels. It operates within an industrial temperature range and supports both Intel (16 mode) and Motorola (68 mode) bus interfaces. The component is housed in an LQFP80 package.

Feature Summary

• Integrated infrared encoder/decoder for IrDA compliance
• Automatic hardware or software flow control capabilities
• Programmable baud rate generator supporting DC to 5 Mbit/s
• Internal loop-back capability for diagnostic testing

Applications

• High-speed modem interface connections
• Shared network environments requiring fast data processing
• Industrial communication systems operating in extreme thermal conditions

Procurement Notes

Verify the specific ordering suffix against current NXP documentation to confirm package type and pin configuration. Confirm that the LQFP80 variant matches the required board layout. Check for any end-of-life notices or recommended design-in alternatives if long-term supply stability is required for the production cycle.

Selection Notes

Select this component when multiple asynchronous serial ports are needed on a single chip. Ensure the host microprocessor supports either the 16-bit or 68-bit interface mode via the 16/68 selection pin. Verify that the system power supply aligns with the 2.5 V, 3.3 V, or 5 V operational requirements of the target application.

Part Context

This part belongs to the SC16C554/554D family of QUARTs. It is pin-compatible with industry-standard ST16C554 and TL16C554 devices. The IB80 designation specifically identifies the LQFP80 plastic low profile quad flat package version of the standard SC16C554 controller.

Replacement Considerations

SC16C554DIA68

FAQ

How does the SC16C554IB80 handle interrupt requests in 68 mode?

In 68 mode, interrupts from all four UART channels are wire-ORed internally to function as a single IRQ interrupt signal.

What is the maximum data rate supported at 2.5 V operation?

At 2.5 V, the maximum data rate is limited to 3 Mbit/s, whereas 5 V and 3.3 V support up to 5 Mbit/s.

Can the SC16C554IB80 operate without external flow control logic?

Yes, it features automatic hardware flow control using RTS and CTS signals, as well as software flow control using programmable Xon/Xoff characters.