Cypress Document History Page, CY7C1541V18, CY7C1556V18 CY7C1543V18, CY7C1545V18, Ecn No, Date

CY7C1541V18, CY7C1556V18

CY7C1543V18, CY7C1545V18

Document History Page

Document Title: CY7C1541V18/CY7C1556V18/CY7C1543V18/CY7C1545V18, 72-Mbit QDR™-II+ SRAM 4-Word Burst Archi- tecture (2.0 Cycle Read Latency)

Document Number: 001-05389

REV.	ECN NO.	ISSUE	ORIG. OF	DESCRIPTION OF CHANGE
		DATE	CHANGE
**	403090	See ECN	VEE	New Data Sheet
*A	425252	See ECN	VEE	Updated the DLL Section
				Fixed typos in the DC and AC parameter section
				Updated the switching waveform
				Updated the Power up sequence
				Added additional parameters in the AC timing
*B	437000	See ECN	IGS	ECN for Show on web
*C	461934	See ECN	NXR	Moved the Selection Guide table from page# 3 to page# 1
				Modified Application Diagram
				Changed tTH and tTL from 40 ns to 20 ns, changed tTMSS, tTDIS, tCS, tTMSH, tTDIH, tCH
				from 10 ns to 5 ns and changed tTDOV from 20 ns to 10 ns in TAP AC Switching
				Characteristics table
				Modified Power Up waveform
				Included Maximum ratings for Supply Voltage on VDDQ Relative to GND
				Changed the Maximum Ratings for DC Input Voltage from VDDQ to VDD
				Changed the Pin Definition of IX from Input Load current to Input Leakage current on
				page#18
*D	497567	See ECN	NXR	Changed the VDDQ operating voltage to 1.4V to VDD in the Features section, in
				Operating Range table and in the DC Electrical Characteristics table
				Added foot note in page# 1
				Changed the Maximum rating of Ambient Temperature with Power Applied from –10°C
				to +85°C to –55°C to +125°C
				Changed VREF (Max) spec from 0.85V to 0.95V in the DC Electrical Characteristics
				table and in the note below the table
				Updated footnote #21 to specify Overshoot and Undershoot Spec
				Updated IDD and ISB values
				Updated ΘJA and ΘJC values
				Removed x9 part and its related information
				Updated footnote #25
*E	1351243	See ECN	VKN/FSU	Converted from preliminary to final
				Added x8 and x9 parts
				Changed tCYC max spec to 8.4 ns for all speed bins
				Updated footnote# 23
				Updated Ordering Information table
*F	2181046	See ECN	VKN/AESA	Added footnote# 22 related to IDD

© Cypress Semiconductor Corporation, 2005-2008. The information contained herein is subject to change without notice. Cypress Semiconductor Corporation assumes no responsibility for the use of any circuitry other than circuitry embodied in a Cypress product. Nor does it convey or imply any license under patent or other rights. Cypress products are not warranted nor intended to be used for medical, life support, life saving, critical control or safety applications, unless pursuant to an express written agreement with Cypress. Furthermore, Cypress does not authorize its products for use as critical components in life-support systems where a malfunction or failure may reasonably be expected to result in significant injury to the user. The inclusion of Cypress products in life-support systems application implies that the manufacturer assumes all risk of such use and in doing so indemnifies Cypress against all charges.

Any Source Code (software and/or firmware) is owned by Cypress Semiconductor Corporation (Cypress) and is protected by and subject to worldwide patent protection (United States and foreign), United States copyright laws and international treaty provisions. Cypress hereby grants to licensee a personal, non-exclusive, non-transferable license to copy, use, modify, create derivative works of, and compile the Cypress Source Code and derivative works for the sole purpose of creating custom software and or firmware in support of licensee product to be used only in conjunction with a Cypress integrated circuit as specified in the applicable agreement. Any reproduction, modification, translation, compilation, or representation of this Source Code except as specified above is prohibited without the express written permission of Cypress.

Disclaimer: CYPRESS MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARD TO THIS MATERIAL, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Cypress reserves the right to make changes without further notice to the materials described herein. Cypress does not assume any liability arising out of the application or use of any product or circuit described herein. Cypress does not authorize its products for use as critical components in life-support systems where a malfunction or failure may reasonably be expected to result in significant injury to the user. The inclusion of Cypress’ product in a life-support systems application implies that the manufacturer assumes all risk of such use and in doing so indemnifies Cypress against all charges.

Use may be limited by and subject to the applicable Cypress software license agreement.

Document Number: 001-05389 Rev. *F Revised March 06, 2008 Page 28 of 28

QDR RAMs and Quad Data Rate RAMs comprise a new family of products developed by Cypress, IDT, NEC, Renesas, and Samsung. All product and company names mentioned in this document are the trademarks of their respective holders.

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