The 8251 is a Universal Synchronous/Asynchronous Receiver/Transmitter (USART) packaged in a 28-pin DIP made by

Intel Intel Corporation is an American multinational corporation and technology company headquartered in Santa Clara, California, and Delaware General Corporation Law, incorporated in Delaware. Intel designs, manufactures, and sells computer compo ...

. It is typically used for serial communication and was rated for 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 The IBM Personal Computer (model 5150, commonly known as the IBM PC) is the first microcomputer released in the IBM PC model line and the basis for the IBM PC compatible ''de facto'' standard. Released on August 12, 1981, it was created by a ...

. It includes 5 sections: # read/write control logic # transmitter # receiver # data bus system # modem control

Variants

Known uses

The Intel 8251A was used in the Intel SDK-86 MCS-86 System Design Kit and the DEC LA120 printing terminal.LA120 Technical Manual
/ref> The device is also used in the IC-10 RS-232 interface kit used in Kenwood amateur radios like the TS-440S, TS-711, TS-811 and many others.

External links and references

* 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
Intel Corporation, "8251 Programmable Communication Interface", Intel 8080 Microcomputer Systems User's Manual, September 1975, page 5-135
from bitsaver.org in PDF {{reflist Intel chipsets IBM PC compatibles Input/output integrated circuits