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8251A ? 2012 rochester electronics, llc. all rights reserved 12192012 specifcation number 8251A-ci (i) rev a page 1 of 11 rochester electronics guarantees performance of its semiconductor products to the original oem specifcations. 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 specifcation herein. * for complete rochester ordering guide, please refer to page 2 * the 8251A is the industry standard universal synchronous/asynchronous receiver/transmitter (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 usart at any time. these include data transmission errors and control signals such as syndet, txempty. the chip is fabricated using intels high performance hmos technology.
page 2 of 11 rochester part number ocm part number package temperature d8251A d8251A dip-28 0 to +70c id8251A id8251A dip-28 -40 to +85c ld8251A ld8251A dip-28 -40 to +85c p8251A p8251A dip-28 0 to +70c qd8251A qd8251A dip-28 0 to +70c qp8251A qp8251A dip-28 0 to +70c td8251A td8251A dip-28 -40 to +85c rochester ordering guide 8251A specifcation number 8251A-ci (i) rev a page 3 of 11 8251A specifcation number 8251A-ci (i) rev a page 4 of 11 8251A specifcation number 8251A-ci (i) rev a page 5 of 11 8251A specifcation number 8251A-ci (i) rev a page 6 of 11 8251A specifcation number 8251A-ci (i) rev a page 7 of 11 8251A specifcation number 8251A-ci (i) rev a page 8 of 11 8251A specifcation number 8251A-ci (i) rev a page 9 of 11 8251A specifcation number 8251A-ci (i) rev a page 10 of 11 8251A specifcation number 8251A-ci (i) rev a page 11 of 11 rochester electronics guarantees performance of its semiconductor products to the original oem specifcations. 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 specifcation herein. 8251A specifcation number 8251A-ci (i) rev a |
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