8251A ROCHESTER | Alldatasheet
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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/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 Intel’s high performance HMOS technology.
Specification Number 8251A-CI (I) REV A Page 2 of 11 Rochester Part Number OCM Part Number Package Temperature D8251A D8251A DIP-28 0° to +70°C ID8251A ID8251A DIP-28 -40° to +85°C LD8251A LD8251A DIP-28 -40° to +85°C P8251A P8251A DIP-28 0° to +70°C QD8251A QD8251A DIP-28 0° to +70°C QP8251A QP8251A DIP-28 0° to +70°C TD8251A TD8251A DIP-28 -40° to +85°C Rochester Ordering Guide
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Specification Number 8251A-CI (I) REV A Page 11 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.