W185 datasheet(1/8 Pages) CYPRESS

Part #	W185

Description	Six Output Peak Reducing EMI Solution

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Manufacturer	CYPRESS [Cypress Semiconductor]

Direct Link	http://www.cypress.com

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Six Output Peak Reducing EMI Solution

W185

Cypress Semiconductor Corporation

•

3901 North First Street

•

San Jose

•

CA 95134

•

408-943-2600

July 25, 2000, rev. *A

Features

• Cypress PREMIS™ family offering

• Generates an EMI optimized clocking signal at the

output

• Selectable output frequency range

• Six 1.25%, 3.75%, or 0% down or center spread outputs

• One non-Spread output of Reference input

• Integrated loop filter components

• Operates with a 3.3V or 5V supply

• Low power CMOS design

• Available in 24-pin SSOP (Shrink Small Outline

Package)

• Outputs may be selectively disabled

Key Specifications

Supply Voltages: ........................................... VDD = 3.3V±5%

or VDD = 5V±10%

Frequency Range: ............................ 28 MHz

≤ F

in ≤ 75 MHz

Crystal Reference Range:................. 28 MHz

≤ F

in ≤ 40 MHz

Cycle to Cycle Jitter: ....................................... 300 ps (max.)

Selectable Spread Percentage: ....................1.25% or 3.75%

Output Duty Cycle: ............................... 40/60% (worst case)

Output Rise and Fall Time: .................................. 5 ns (max.)

Table 1. Modulation Width Selection

SS%

W185

Output

W185-5

Output

0Fin ≥ Fout ≥ Fin – 1.25%

Fin + 0.625% ≥ Fin≥

– 0.625%

1Fin ≥ Fout ≥ Fin – 3.75%

Fin + 1.875% ≥ Fin≥

–1.875%

Table 2. Frequency Range Selection

FS2

FS1

Frequency Range

0

28 MHz

≤ F

IN ≤ 38 MHz

0

1

38 MHz

≤ F

IN ≤ 48 MHz

10

46 MHz

≤ F

IN ≤ 60 MHz

11

58 MHz

≤ F

IN ≤ 75 MHz

Table 3. Output Enable

EN1

EN2

CLK0:4

CLK5

0

Low

01

Low

Active

10

Active

Low

1

Active

PREMIS is a trademark of Cypress Semiconductor Corporation.

Simplified Block Diagram

Pin Configuration

24

23

22

21

1

2

3

4

REFOUT

FS2

X1

X2

SSON#

RESET

FS1

VDD

5

6

7

18

19

20

VDD

NC

EN1

GND

SS%

EN2

8

9

10

15

16

17

CLK5

VDD

CLK4

GND

CLK0

VDD

13

14

GND

CLK3

11

12

CLK1

CLK2

SSOP

Spread Spectrum

W185

(EMI suppressed)

3.3V or 5.0V

Oscillator or

Spread Spectrum

W185

(EMI suppressed)

3.3V or 5.0V

XTAL

X1

X2

Reference Input

Input

Output

40MHz

max.

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