CY25245 Datasheet, PDF (1/11 Pages) Cypress Semiconductor – Frequency-multiplying, Peak-reducing EMI Solution

CY25245
Frequency-multiplying, Peak-reducing
EMI Solution
Features
• Cypress PREMIS™ SMARTSPREAD™ family offering
• Generates an electromagnetic interference (EMI)
optimized clocking signal at the output
• Selectable output frequency range
• Single 1.25%, 2.5%, 5%, or 10% down or center spread
output
• Integrated loop filter components
• Operates with a 3.3 or 5V supply
• Low power CMOS design
• Available in 20-pin Small Shrunk Outline Package
(SSOP)
Key Specifications
Supply voltages: .......................................V_DD = 3.3V ± 0.3V
or V_DD = 5V ± 10%
Frequency range:............................ 13 MHz ≤ F_in ≤ 166 MHz
Cycle-to-cycle jitter: ......................................... 250 ps (max)
Output duty cycle: ................................ 40/60% (worst case)
Simplified Block Diagram
3.3V or 5.0V
XTAL
Input
X1
X2
SDATA
SCLK
CY25245
Serial Interface
Spread Spectrum
Output
(EMI suppressed)
3.3V or 5.0V
Oscillator or
Reference Input
X1
SDATA
SCLK
CY25245
Serial Interface
Spread Spectrum
Output
(EMI suppressed)
Pin Configuration^{[1, 2]}
SSOP
X1 1
X2 2
AVDD 3
MW0^ 4
SDATA 5
OR1^ 6
SCLK 7
GND 8
OR2* 9
SSON#^ 10
20 REFOUT
19 VDD
18 GND
17 IR1*
16 ^IR2*
15 SSOUT
14 MW1*
13 GND
12 VDD
11 MW2^
Notes:
1. Pins marked with ^ are internal pull-down resistors with weak 250 kΩ.
2. Pins marked with * are internal pull-up resistors with weak 80 kΩ.
Cypress Semiconductor Corporation • 3901 North First Street • San Jose, CA 95134 • 408-943-2600
Document #: 38-07124 Rev. *B
Revised February 2, 2005