UART IP Datasheet v – Dec 15, 1 of Semiconductor Design Solutions tx & rx control iow, iow_n ior, ior_n cs1, cs2, cs_n data_in[] add[]. The PCD is an improved version of the original Universal Asynchronous Receiver Transmitter (UART). Functionally identical to the on. 16C UART Interface IC are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for 16C UART Interface IC.

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UART – Wikipedia

Views Read Edit View history. Interfaces are listed by their speed in the dtaasheet ascending order, 16cc550 the interface at the end of each section should be the fastest. The original had a bug that prevented this FIFO from being used. By using this site, you agree to the Terms of Use and Privacy Policy. To overcome these shortcomings, the series UARTs incorporated a byte FIFO buffer with a programmable interrupt trigger of 1, 4, 8, or 14 bytes.


This generated high rates of interrupts as transfer speeds increased. Pages using web citations with no URL.

Dropouts occurred with The corrected -A version was released in by National Semiconductor. Technical and de facto standards for wired computer buses. The Art of Serial Communication. The part was originally made by National Semiconductor. Retrieved from ” https: The current version since by Texas Instruments which bought 1c550 Semiconductor is called the D.

The C and CF models are okay too, according to this source. The also incorporates a transmit FIFO, though this feature is less critical as delays in interrupt service would only result in sub-optimal transmission speeds and not actual data loss.

This page was last edited on 28 Novemberat The A F version was a must-have to use modems with a data transmit rate of baud. daasheet

At speeds higher than baudowners discovered that the serial ports of the computers were not able to handle a continuous flow of data without losing characters. Not all manufacturers adopted this nomenclature, however, continuing to refer to the fixed chip as a More critically, with only a 1-byte buffer there is a genuine risk that a received byte will be overwritten if interrupt service delays occur.


From Wikipedia, the free encyclopedia. National Semiconductor later released the A which corrected this issue.

16550 UART

Exchange of the having only a one-byte received data buffer with aand occasionally patching or setting system software to be aware of the FIFO feature of the new chip, improved the reliability dataseet stability of high-speed connections. Similarly numbered devices, with varying levels of compatibility with the original National Semiconductor part, are made by other manufacturers. The A and newer is pin compatible with the