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Cypress Semiconductor Electronic Components Datasheet



W182-5

Full Feature Peak Reducing EMI Solution



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W182-5 pdf
W182
Full Feature Peak Reducing EMI Solution
Features
Table 1. Modulation Width Selection
Cypress PREMIS™ family offering
• Generates an EMI optimized clocking signal at the
output
• Selectable output frequency range
• Single 1.25% or 3.75% down or center spread output
• Integrated loop filter components
• Operates with a 3.3 or 5V supply
• Low power CMOS design
• Available in 14-pin SOIC (Small Outline Integrated
Circuit)
Key Specifications
Supply Voltages: ........................................... VDD = 3.3V±5%
or VDD = 5V±10%
Frequency Range: .............................. 8 MHz Fin 28 MHz
Cycle to Cycle Jitter: ........................................ 300 ps (max.)
SS%
0
1
W182
Output
Fin Fout Fin
– 1.25%
Fin Fout Fin
– 3.75%
W182-5
Output
Fin + 0.625% Fin
– 0.625%
Fin + 1.875% Fin
–1.875%
Table 2. Frequency Range Selection
FS2 FS1
00
01
10
11
Frequency Range
8 MHz FIN 10 MHz
10 MHz FIN 15 MHz
15 MHz FIN 18 MHz
18 MHz FIN 28 MHz
Selectable Spread Percentage: ....................1.25% or 3.75%
Output Duty Cycle: ............................... 40/60% (worst case)
Output Rise and Fall Time: .................................. 5 ns (max.)
Simplified Block Diagram
3.3V or 5.0V
Pin Configuration
SOIC
XTAL
Input
X1
X2
W182
Spread Spectrum
Output
(EMI suppressed)
FS2
CLKIN or X1
NC or X2
GND
GND
SS%
FS1
1
2
3
4
5
6
7
14 REFOUT
13 OE#
12 SSON#
11 Reset
10 VDD
9 VDD
8 CLKOUT
3.3V or 5.0V
Oscillator or
Reference Input
W182
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
June 8, 2000, rev. *A



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W182-5 pdf
Pin Definitions
Pin Name
CLKOUT
REFOUT
Pin No.
8
14
CLKIN or X1
2
NC or X2
SSON#
3
12
SS%
6
OE#
13
Reset
11
FS1:2
VDD
GND
7, 1
9,10
4,5
W182
Pin
Type
O
O
I
I
I
I
I
I
I
P
G
Pin Description
Output Modulated Frequency: Frequency modulated copy of the input clock
(SSON# asserted).
Non-Modulated Output: This pin provides a copy of the reference frequency.
This output will not have the Spread Spectrum feature enabled regardless of
the state of logic input SSON#.
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.
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. This pin has an internal pull-up resistor.
Output Enable (Active LOW): When this pin is held HIGH, the output buffers
are placed in a high-impedance mode.This pin has an internal pull-down re-
sistor.
ModulationProfile Restart: A rising edge on this input restarts the modulation
pattern at the beginning of its defined path. This pin has an internal pull-down
resistor.
Frequency Selection Bit(s): These pins select the frequency range of oper-
ation. Refer to Table 2. These pins have internal pull-up resistors.
Power Connection: Connected to 3.3V or 5V power supply.
Ground Connection: Connect all ground pins to the common ground plane.
2



Part Number W182-5
Description Full Feature Peak Reducing EMI Solution
Maker Cypress Semiconductor - Cypress Semiconductor
Total Page 8 Pages
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