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QP8251A Datasheet(PDF) 1 Page - Rochester Electronics

Part # QP8251A
Description  PROGRAMMABLE COMMUNICATION INTERFACE 28-Pin DIP Package
Download  11 Pages
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Manufacturer  ROCHESTER [Rochester Electronics]
Direct Link  http://www.rocelec.com/
Logo ROCHESTER - Rochester Electronics

QP8251A Datasheet(HTML) 1 Page - Rochester Electronics

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8251A
© 2012 Rochester Electronics, LLC. All Rights Reserved 12192012
Specification Number 8251A-CI (I) REV A
Page 1 of 11
Rochester Electronics guarantees performance of its semiconductor products to the original OEM specifications. “Typical” values are for reference purposes
only. Certain minimum or maximum ratings may be based on product characterization, design, simulation, or sample testing. Rochester Electronics reserves
the right to make changes without further notice to any specification herein.
* For complete Rochester ordering guide, please refer to page 2 *
The 8251A is the industry standard Universal Synchronous/Asynchronous Receiver/T
ransmitter (USART)
designed for data communications with microprocessor families such as MCS-48, 80,
85, and iAPX 86, 88.
The 8251A is used as a peripheral device and is programmed by the CPU to operate using
virtually any serial
data transmission technique presently in use (including IBM “bi-sync”). The USART accepts
data characters
from the CPU in parallel format and then converts them into a continuous serial data stream
for transmission.
Simultaneously, it can receive serial data streams and convert them into parallel data characters
for the CPU.
The USART will signal the CPU whenever it can accept a new character for transmission
or whenever it has
received a character for the CPU. The CPU can read the complete status of the USAR
T at any time. These
include data transmission errors and control signals such as SYNDET, TxEMPTY. The chip
is fabricated using
Intel’s high performance HMOS technology.


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