{{Short description|Universal asynchronous reveiver/transmitter made by intel}} [[File:Ic-photo-Intel--C8251.JPG|thumb|Intel C8251]] The 8251 is a [[USART|Universal Synchronous/Asynchronous Receiver/Transmitter]] (USART) packaged in a 28-pin [[dual in-line package|DIP]] made by [[Intel]]. It is typically used for [[serial communication]] and was rated for {{nowrap|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: # read/write control logic # transmitter # receiver # [[data bus]] system # [[modem]] control
== Variants ==
{| class="wikitable" |- ! Model Number !! Temperature Range !! Date of Release !! Price (USD)<ref group=list>In quantities of 100 and up</ref> |- | ID8251 || Industrial || March/April 1979<ref>Intel Corporation, "Microcomputer Component: New industrial grade product line answers the demand for high-reliability components to operate in industrial applications.", Intel Preview, March/April 1979, Pg. 11</ref> || $25.10 |- | 8251A || Commercial || May/June 1980<ref>Intel Corporation, "Intel peripherals enhance 8086 system design", Intel Preview Special Issue: 16-Bit Solution, May/June 1980, Pg. 22</ref> || $6.40 |}
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== Known uses ==
The Intel 8251A was used in the Intel SDK-86 MCS-86 System Design Kit<ref>{{Cite web |url=http://www.bitsavers.org/pdf/intel/8086/9800698A_SDK-86_Users_Man_Apr79.pdf |title=Intel SDK-86 MCS-86 System Design Kit User's Guide |access-date=2016-08-19 |archive-date=2012-09-10 |archive-url=https://web.archive.org/web/20120910070044/http://www.bitsavers.org/pdf/intel/8086/9800698A_SDK-86_Users_Man_Apr79.pdf |url-status=dead }}</ref> and the [[Digital Equipment Corporation|DEC]] LA120 printing [[computer terminal|terminal]].<ref>[http://bitsavers.trailing-edge.com/pdf/dec/terminal/la120/EK-LA120-TM-001_LA120_Technical_Manual_Jan80.pdf LA120 Technical Manual]</ref> The device is also used in the IC-10 RS-232 interface kit used in [[Kenwood Corporation|Kenwood]] [[amateur radio]]s 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 * [http://www.bitsavers.org/components/intel/MCS80/98-153B_Intel_8080_Microcomputer_Systems_Users_Manual_197509.pdf Intel Corporation, "8251 Programmable Communication Interface", Intel 8080 Microcomputer Systems User's Manual, September 1975, page 5-135] from bitsaver.org in PDF
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[[Category:Intel chipsets]] [[Category:IBM PC compatibles]] [[Category:Input/output integrated circuits]]