CY2037
Document #: 38-07354 Rev. *D
Page 5 of 10
Difference Between CY2037A/CY2037B and
CY2037-2
The CY2037A/CY2037B contains a shadow register in
addition to the EPROM register. The shadow register is an
exact copy of the EPROM register and is the default register
when the Valid bit is not set. It is useful when the prototype or
production environment calls for measuring and adjusting the
CLKOUT frequency numerous times. Multiple adjustments
can be performed with the shadow register. Once the desired
frequency is achieved the EPROM register is permanently
programmed.
Some production flows do not require the use of the shadow
register. If this is the case, then the CY2037-2 is the device of
choice. The CY2037-2 has a disabled shadow register.
The CY2037-3 contains the shadow register.
Frequency Select Feature of CY2037-3
The CY2037-3 contains a frequency select function in place of
the powerdown and the output enable functions. With the
frequency select feature, customers can switch two different
frequencies that are configured in the two EPROM rows. The
definition of the Frequency Select pin (FS) is Table 4.
.
Table 4. Frequency Select Pin Decoding for CY2037-3
FS Pin
Output Frequency
0
From EPROM Row 0 Configuration
1
From EPROM Row 1 Configuration
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