Cypress Semiconductor CY2907 Handmatig

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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

CyClocks RT that is part of the CyberClocks software suite.

The CY2071A, shown in

Figure

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.

November 12, 2007

CY2071A/CY2907 Clock Generators

1, is programmed using

2, and CY2907 family of

Figure 1. CY22381 Pinout

Figure 2. CY2701A Pinout

Document No. 001-14530 Rev. *A

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.

AN2701

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