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NOTICE
EXAR Corporation reserves the right to make changes to the products contained in this publication in order to
improve design, performance or reliability. EXAR Corporation assumes no responsibility for the use of any
circuits described herein, conveys no license under any patent or other right, and makes no representation that
the circuits are free of patent infringement. Charts and schedules contained here in are only for illustration
purposes and may vary depending upon a user’s specific application. While the information in this publication
has been carefully checked; no responsibility, however, is assumed for inaccuracies.
EXAR Corporation does not recommend the use of any of its products in life support applications where the
failure or malfunction of the product can reasonably be expected to cause failure of the life support system or
to significantly affect its safety or effectiveness. Products are not authorized for use in such applications unless
EXAR Corporation receives, in writing, assurances to its satisfaction that: (a) the risk of injury or damage has
been minimized; (b) the user assumes all such risks; (c) potential liability of EXAR Corporation is adequately
protected under the circumstances.
Copyright 2010 EXAR Corporation
Datasheet September 2010.
Send your UART technical inquiry with technical details to hotline: uarttechsupport@exar.com.
Reproduction, in part or whole, without the prior written consent of EXAR Corporation is prohibited.
XR16L2552
REV. 1.1.2 2.25V TO 5.5V DUART WITH 16-BYTE FIFO
REVISION HISTORY
DATE REVISION DESCRIPTION
November 2002 P1.0.0 Preliminary Datasheet.
March 2003 P1.0.1 Updated AC Electrical Characteristics. Updated register set with enhanced features.
May 2003 P1.0.2 Added patent number to first page.
June 2003 P1.0.3 Added Device Status to Ordering Information.
July 2003 P1.0.4 Updated AC Electrical Characteristics.
September 2003 1.0.0 Final Production Release. Updated 5V tolerance information.
September 2004 1.1.0 Corrected A2 and A0 pin numbers for PLCC-44 package in Pin Descriptions. Added
Device Revision and Device ID registers and descriptions.
May 2005 1.1.1 Updated the Data Access Time (T
RDV
) in AC Electrical Characteristics.
September 2010 1.1.2 Updated "Voltage at any pin"from "GND-0.3V to VCC + 0.3V" to "GND-0.3V to
+5.5V" in the “Absolute Maximum Ratings” table.
