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W245-30 Datasheet(PDF) 2 Page - Cypress Semiconductor

Part No. W245-30
Description  Frequency Multiplying, Peak Reducing EMI Solution
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Manufacturer  CYPRESS [Cypress Semiconductor]
Direct Link  http://www.cypress.com
Logo CYPRESS - Cypress Semiconductor

W245-30 Datasheet(HTML) 2 Page - Cypress Semiconductor

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W245-30
Document #: 38-07229 Rev. *B
Page 2 of 12
Pin Description
Pin Name
Pin No.
Pin
Type
Pin Description
SSOUT
15
O
Output Modulated Frequency: Frequency modulated copy of the input clock
(SSON# asserted).
REFOUT
20
O
Non-Modulated Output: This pin provides a copy of the reference frequency.
This output will not have the Spread Spectrum feature enabled regardless of
the state of logic input SSON#.
X1
1
I
Crystal Connection or External Reference Frequency Input: This pin has
dual functions. It may either be connected to an external crystal, or to an
external reference clock.
X2
2
I
Crystal Connection: Input connection for an external crystal. If using an ex-
ternal reference, this pin must be left unconnected.
SSON#
10
I
Spread Spectrum Control (Active LOW): Asserting this signal (active LOW)
turns the internal modulation waveform on. This pin has an internal pull-down
resistor.
MW0:2
4, 11, 14
I
Modulation Width Selection: When Spread Spectrum feature is turned on,
these pins are used to select the amount of variation and peak EMI reduction
that is desired on the output signal. MW1:Down, MW1:Up, MW2:Down (See
Table 2).
IR1:2
17, 16
I
Reference Frequency Selection: Logic level provided at this input indicates
to the internal logic what range the reference frequency is in and determines
the factor by which the device multiplies the input frequency. Refer to Table 3.
These pins have internal pull-up resistors.
OR1:2
6, 9
I
Output Frequency Selection Bits: These pins select the frequency operation
for the output. Refer to Table 1. OR2 pin have internal pull-up resistors. OR1
pin have internal pull-down resistors.
SCLK
7
I
Clock pin for SMBus circuitry.
SData
5
I/O
Data pin for SMBus Circuitry.
VDD
12, 19
P
Power Connection: Connected to 3.3V or 5V power supply.
AVDD
3
P
Analog Power Connection: Connected to 3.3V or 5V power supply.
GND
8, 13, 18
G
Ground Connection: Connect all ground pins to the common ground plane.


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