Cypress Semiconductor CY2071A User manual

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

CY2071A/CY2907 Clock Generators

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 functional-

ity 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 soft-

ware 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.

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 fre-

quency select options and is dependant on the difference in

PLL technology. Contact Cypress Applications for assistance

in converting existing files.

Figure 1. CY22381 Pinout

Figure 2. CY2701A Pinout

AN2701

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AN2701

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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 authorizeits 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.

This Source Code (software and/or firmware) is owned by Cypress Semiconductor Corporation (Cypress) and is protected by and subject to worldwide

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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

asspecified intheapplicableagreement. Anyreproduction,modification, translation,compilation, or representationof 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.

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

In March of 2007, Cypress recataloged 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.

All trademarks or registered trademarks referenced herein are the property of their respective owners.

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