Intel 8251

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Intel C8251

The 8251 is a Universal Synchronous/Asynchronous Receiver/Transmitter packaged in a 28-pin DIP made by Intel. It is typically used for serial communication and was rated for 19.2 kilobits per second signalling rate.

It is commonly confused with the much more common 8250 UART that was made popular as the serial port in the IBM Personal Computer.

It includes 5 sections

  1. read/write control logic
  2. transmitter
  3. receiver
  4. data bus system
  5. modem control


There is a version of 8251A available for US$6.40 in quantity of 100.[1]

Known uses[edit]

The Intel 8251A was used in the Intel SDK-86 MCS-86 System Design Kit[2] and the DEC LA120 printing terminal.[3]

External links and references[edit]

  • Mikrocomputer Bausteine, Datenbuch 1979/80, Band 3, Peripherie, Siemens AG, Bestellnummer B 2049, pp. 64–101.
  • NEC Electronics (Europe) GmbH, 1982 Catalog, pp. 631–648
  1. ^ Intel peripherals enhance 8086 system design, Intel Preview Special Issue: 16-Bit Solutions, Intel Corporation, May/June 1980, page 22
  2. ^ Intel SDK-86 MCS-86 System Design Kit User's Guide
  3. ^ LA120 Technical Manual