W185-5
| Model | W185-5 |
| Description | Six Output Peak Reducing EMI Solution |
| PDF file | Total 8 pages (File size: 119K) |
| Chip Manufacturer | CYPRESS |
W185
Six Output Peak Reducing EMI Solution
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
Table 1. Modulation Width Selection
SS%
0
1
W185
Output
F
in
≥
F
out
≥
F
in
– 1.25%
F
in
≥
F
out
≥
F
in
– 3.75%
W185-5
Output
F
in
+ 0.625%
≥
F
in
≥
– 0.625%
F
in
+ 1.875%
≥
F
in
≥
–1.875%
Table 2. Frequency Range Selection
FS2
0
0
1
FS1
0
1
0
1
Frequency Range
28 MHz
≤
F
IN
≤
38 MHz
38 MHz
≤
F
IN
≤
48 MHz
46 MHz
≤
F
IN
≤
60 MHz
58 MHz
≤
F
IN
≤
75 MHz
Key Specifications
Supply Voltages: ........................................... V
DD
= 3.3V±5%
or V
DD
= 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.)
1
Table 3. Output Enable
EN1
0
0
1
1
EN2
0
1
0
1
Low
Low
Active
Active
CLK0:4
Low
Active
Low
Active
CLK5
Simplified Block Diagram
3.3V or 5.0V
Pin Configuration
SSOP
X1
XTAL
Input
40MHz
max.
X2
W185
Spread Spectrum
Output
(EMI suppressed)
REFOUT
FS2
X1
X2
GND
SS%
EN2
GND
CLK0
VDD
CLK1
CLK2
1
2
3
4
5
6
24
23
22
21
20
19
18
17
16
15
14
13
SSON#
RESET
FS1
VDD
VDD
NC
EN1
CLK5
VDD
CLK4
GND
CLK3
W185/W185-5
7
8
9
3.3V or 5.0V
10
11
12
Oscillator or
Reference Input
W185
Spread Spectrum
Output
(EMI suppressed)
PREMIS is a trademark of Cypress Semiconductor Corporation.
Cypress Semiconductor Corporation
•
3901 North First Street
•
San Jose
•
CA 95134
•
408-943-2600
July 25, 2000, rev. *A
