Cypress CY2907, CY2071A User Manual

CY2071A/CY2907 Clock Generators

AN2701

The Cypress CY2071A and CY2907 family of products are discontinued and should no longer be used for
new designs. The CY22381 is a 3.3V pin for pin compatible replacement for the CY2071A and should be
used in all new designs and legacy device modifications.There is no option for a 5V VDD on the CY22381.
There is no direct pin for pin replacement for the CY2907. The CY22392 is the closest match in functional­ity to the CY2907.

Introduction

The CY22381, shown in Figure 1, is programmed using
CyClocks RT that is part of the CyberClocks software suite.

The CY2071A, shown in Figure 2, and CY2907 family of
devices are programmed using the PC driven CyClocks soft­ware that is also part of the CyberClocks software suite.
CyClocks software stores the program file as an entry file that
uses a text file with an .ent file extension. CyClocks allows
the user to create an EPROM vector from an existing entry
file. The entry file or EPROM vector is not compatible with the
CY22381 CyClocks RT software and cannot be imported or
used to create a CY22381 programmable JEDEC file.

Figure 1. CY22381 Pinout

Figure 2. CY2701A Pinout

To program a compatible CY22381, the user must take the
input and output frequencies and manually enter the data into
the CyClocks RT software. The header of an existing entry
file may contain useful data that helps the user in manually
programming the CY22381 device. A case may arise where
all of the output frequencies cannot be mapped into the
CY22381 device. This is more prevalent when using the fre­quency select options and is dependant on the difference in
PLL technology. Contact Cypress Applications for assistance
in converting existing files.

November 12, 2007 Document No. 001-14530 Rev. *A 1

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AN2701

In March of 2007, Cypress recataloge d all of its Application Notes using a new documentation number and revision code. This new documentation
number and revision code (001-xxxxx, beginning with rev. **), located in the footer of the document, will be used in all subsequent revisions.
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© Cypress Semiconductor Corpo ration, 2006-2007. The information containe d 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. Cypr ess prod ucts are not wa rranted no r inten ded to be u sed for medical, l ife suppor t, lif e saving, cri tical control or
safety applications, unless pursuant to an ex press written agre ement with Cypres s. Furthermore, Cy press does not au thorize 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 sy stems application implies that the manufacturer assumes all r isk of such use and in doing so indemnifies Cypress
against all charges.

This Source Code (software and/or firmware ) is own ed by Cypr ess Semi conductor Corporat ion (Cy press) an d is prot ected by and sub ject 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 herei n. 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.

November 12, 2007 Document No. 001-14530 Rev. *A 2

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