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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 2013 EXAR Corporation
Datasheet April 2013.
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.
XR16C864
REV. 2.2.0
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
REVISION HISTORY
D
ATE
R
EVISION
D
ESCRIPTION
January 2004 Rev. 2.0
Added Revision History. Changed to standard style format. Clarified
sleep mode conditions. Renamed FIFORdy register to FSTAT register.
Devices with top mark date code of "F2 YYWW" and newer have 5V toler-
ant inputs (except for XTAL1). Devices with top mark date code of "DC
YYWW" and older do not have 5V tolerant inputs.
April 2004 Rev. 2.0.1 Updated FCTR bit-3 description.
January 2013 Rev 2.1.0 Updated Ordering Information: Removed discontinued part numbers, added
Green/RoHS part numbers and TR part numbers. Updated package drawing.
April 2013 Rev 2.2.0 Updated AC Electrical Characteristics.
