W181(2000) 查看數據表（PDF） - Cypress Semiconductor

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W181
(Rev.:2000)

Peak Reducing EMI Solution

Cypress Semiconductor 

W181

Pin Definitions

Pin Name

CLKOUT

Pin No.

(SOIC)

5

CLKIN or X1

1

Pin No.

(TSSOP)(-01)

8

2

NC or X2

SSON#

FS1:2

2

8(02/03/52/

53)

7, 8 (01/51)

3

--

12, 1

SS%

4

6

VDD

GND

NC

6

10

3

4

5, 7, 9, 11, 13,

14

Pin

Type

O

I

I

I

I

I

P

G

NC

Pin Description

Output Modulated Frequency: Frequency modulated copy

of the unmodulated input clock (SSON# asserted).

Crystal Connection or External Reference Frequency In-

put: This pin has dual functions. It may either be connected

to an external crystal, or to an external reference clock.

Crystal Connection: If using an external reference, this pin

must be left unconnected.

Spread Spectrum Control (Active LOW): Asserting this sig-

nal (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 fea-

ture is turned on, this pin is used to select the amount of

variation and peak EMI reduction that is desired on the output

signal. This pin has an internal pull-up resistor.

Power Connection: Connected to 3.3V or 5V power supply.

Ground Connection: Connect all ground pins to the com-

mon system ground plane.

No Connection.

2

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