W180 Datasheet, PDF (2/8 Pages) Cypress Semiconductor – Peak Reducing EMI Solution

W180
Pin Definitions
Pin Name
CLKOUT
CLKIN or X1
Pin No.
5
1
NC or X2
SSON#
FS1:2
SS%
2
8 (-02, -03
52, 53)
7, 8 (-01, 51)
4
VDD
6
GND
3
Pin
Type
O
I
I
I
I
I
P
G
Pin Description
Output Modulated Frequency: Frequency modulated copy of the unmodu-
lated input clock (SSON# asserted).
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.
Crystal Connection: Input connection for an external crystal. If using an ex-
ternal reference, this pin must be left unconnected.
Spread Spectrum Control (Active LOW): Asserting this signal (active LOW)
turns the internal modulation waveform on. This pin has an internal pull-down
resistor.
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.
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.
Power Connection: Connected to 3.3V or 5V power supply.
Ground Connection: This should be connected to the common ground plane.
2