# Intel 8251

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Universal asynchronous reveiver/transmitter made by intel

Intel C8251

The 8251 is a [Universal Synchronous/Asynchronous Receiver/Transmitter](/source/USART) (USART) packaged in a 28-pin [DIP](/source/Dual_in-line_package) made by [Intel](/source/Intel). It is typically used for [serial communication](/source/Serial_communication) and was rated for 19.2 [kilobits](/source/Kilobits) per second signalling rate.

It is commonly confused with the much more common [8250 UART](/source/8250_UART) that was made popular as the [serial port](/source/Serial_port) in the [IBM Personal Computer](/source/IBM_Personal_Computer).

It includes 5 sections:

1. read/write control logic

1. transmitter

1. receiver

1. [data bus](/source/Data_bus) system

1. [modem](/source/Modem) control

## Variants

Model Number Temperature Range Date of Release Price (USD)[list 1] ID8251 Industrial March/April 1979[1] $25.10 8251A Commercial May/June 1980[2] $6.40

1. **[^](#cite_ref-1)** In quantities of 100 and up

## Known uses

The Intel 8251A was used in the Intel SDK-86 MCS-86 System Design Kit[3] and the [DEC](/source/Digital_Equipment_Corporation) LA120 printing [terminal](/source/Computer_terminal).[4] The device is also used in the IC-10 RS-232 interface kit used in [Kenwood](/source/Kenwood_Corporation) [amateur radios](/source/Amateur_radio) 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](http://www.bitsavers.org/components/intel/MCS80/98-153B_Intel_8080_Microcomputer_Systems_Users_Manual_197509.pdf) from bitsaver.org in PDF

1. **[^](#cite_ref-2)** 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

1. **[^](#cite_ref-3)** Intel Corporation, "Intel peripherals enhance 8086 system design", Intel Preview Special Issue: 16-Bit Solution, May/June 1980, Pg. 22

1. **[^](#cite_ref-4)** ["Intel SDK-86 MCS-86 System Design Kit User's Guide"](https://web.archive.org/web/20120910070044/http://www.bitsavers.org/pdf/intel/8086/9800698A_SDK-86_Users_Man_Apr79.pdf) (PDF). Archived from [the original](http://www.bitsavers.org/pdf/intel/8086/9800698A_SDK-86_Users_Man_Apr79.pdf) (PDF) on 2012-09-10. Retrieved 2016-08-19.

1. **[^](#cite_ref-5)** [LA120 Technical Manual](http://bitsavers.trailing-edge.com/pdf/dec/terminal/la120/EK-LA120-TM-001_LA120_Technical_Manual_Jan80.pdf)

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