W184 Datasheet, PDF (1/8 Pages) Cypress Semiconductor – Six Output Peak Reducing EMI Solution

W184
Six Output Peak Reducing EMI Solution
Features
Table 1. Modulation Width Selection
• Cypress PREMIS™ family offering
• Generates an EMI optimized clocking signal at the
output
• Selectable input to output frequency
• Six 1.25%, 3.75%, or 0% down or center spread outputs
• One non-Spread reference output
• Integrated loop filter components
• Operates with a 3.3 or 5V supply
• Low power CMOS design
• Available in 24-pin SSOP (Shrunk Small Outline
Package)
• Outputs may be selectively disabled
Key Specifications
Supply Voltages: ........................................... V_DD = 3.3V±5%
or V_DD = 5V±10%
Frequency Range: .............................. 8 MHz ≤ F_in ≤ 28 MHz
Crystal Reference Range.................... 8 MHz ≤ F_in ≤ 28 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.)
SS%
0
1
W184
Output
F_in ≥ F_out ≥ F_in – 1.25%
F_in ≥ F_out ≥ F_in – 3.75%
W184-5
Output
F_in + 0.625% ≥ F_in≥ –
0.625%
F_in + 1.875% ≥ F_in≥
–1.875%
Table 2. Frequency Range Selection
FS2
FS1
0
0
0
1
1
0
1
1
Table 3. Output Enable
Frequency Range
8 MHz ≤ F_IN ≤ 10 MHz
10 MHz ≤ F_IN ≤ 15 MHz
15 MHz ≤ F_IN ≤ 18 MHz
18 MHz ≤ F_IN ≤ 28 MHz
EN1 EN2
CLK0:4
0
0 Low
0
1 Low
1
0 Active
CLK5
Low
Active
Low
1
1 Active
Active
Simplified Block Diagram
3.3 or 5.0V
XTAL
Input
X1
X2
W184
Spread Spectrum
Outputs
(EMI suppressed)
3.3 or 5.0V
Oscillator or
Reference Input
W184
Spread Spectrum
Outputs
(EMI suppressed)
Pin Configuration
SSOP
REFOUT 1
FS2 2
X1 3
X2 4
GND 5
SS% 6
EN2 7
GND 8
CLK0 9
VDD 10
CLK1 11
CLK2 12
24 SSON#
23 RESET
22 FS1
21 VDD
20 ^VDD
19 NC
18 EN1
17 ^CLK5
16 VDD
15 CLK4
14 GND
13 CLK3
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. *B