Cypress CY2907 User Manual
An2701, Introduction
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
, is programmed using
CyClocks RT that is part of the CyberClocks software suite.
The CY2071A, shown in
, 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