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W180
2
Pin Definitions
Pin Name
Pin No.
Pin
Type
Pin Description
CLKOUT
5
O
Output Modulated Frequency: Frequency modulated copy of the unmodu-
lated input clock (SSON# asserted).
CLKIN or 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.
NC or X2
2
I
Crystal Connection: Input connection for an external crystal. If using an ex-
ternal reference, this pin must be left unconnected.
SSON#
8 (-02, -03
52, 53)
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.
FS1:2
7, 8 (-01, 51)
I
Frequency Selection Bit(s) 1 and 2: These pins select the frequency range
of operation. Refer to Table 2. These pins have internal pull-up resistors.
SS%
4
I
Modulation Width Selection: When Spread Spectrum feature is turned on,
this pin is used to select the amount of variation and peak EMI reduction that
is desired on the output signal. Internal pull-up resistor.
VDD
6
P
Power Connection: Connected to 3.3V or 5V power supply.
GND
3
G
Ground Connection: This should be connected to the common ground plane.
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