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參數(shù)資料
| 型號(hào)： | CY25562 |
| 英文描述： | Clocks and Buffers |
| 中文描述： | 時(shí)鐘和緩沖器 |
| 文件頁數(shù)： | 2/8頁 |
| 文件大?。?/td> | 391K |
| 代理商： | CY25562 |
CY25562
Document #: 38-07392 Rev. *B
Page 2 of 8
Pin Description
General Description
The Cypress CY25562 is a Spread Spectrum Clock Generator
(SSCG) IC used for the purpose of reducing electromagnetic
interference (EMI) found in today
’
s high-speed digital
electronic systems.
The CY25562 uses a Cypress-proprietary phase-locked loop
(PLL) and Spread Spectrum Clock (SSC) technology to
synthesize and frequency modulate the input frequency of the
reference clock. By frequency modulating the clock, the
measured EMI at the fundamental and harmonic frequencies
of clock (SSCLK) is greatly reduced.
This reduction in radiated energy can significantly reduce the
cost of complying with regulatory requirements and time to
market without degrading system performance.
The CY25562 is a very simple and versatile device to use. The
frequency and spread % range is selected by programming S0
and S1 digital inputs. These inputs use three (3) logic states
including High (H), Low (L), and Middle (M) logic levels to
select one of the nine available Spread % ranges. Refer
to
Table 1
for programming details.
The CY25562 is intended for applications with a reference
frequency in the range of 50 to 200 MHz.
A wide range of digitally selectable spread percentages is
made possible by using tri-level (High, Low, and Middle) logic
at the S0 and S1 digital control inputs.
The output spread (frequency modulation) is symmetrically
centered on the input frequency.
Spread Spectrum Clock Control (SSCC) function enables or
disables the frequency spread and is provided for easy
comparison of system performance during EMI testing.
The CY25562 is available in an eight-pin SOIC package with
a 0-to-70
°
C operating temperature range.
Refer to the CY25561 for applications with lower drive require-
ments and the CY25560 with lower drive and frequency
requirements.
Pin #
1
2
3
4
Pin Name
Xin/CLK
VDD
GND
SSCLK
Type
I
P
P
O
Pin Description
Clock or Crystal connection input
. Refer to
Table 1
for input frequency range selection.
Positive power supply
.
Power supply ground
.
SSCG Modulated clock output
.
Spread Spectrum Clock Control (Enable/Disable) function
. SSCG function is enabled
when input is high and disabled when input is low. This pin is pulled high internally.
Tri-level Logic input control pin used to select frequency and bandwidth
.
Frequency/bandwidth selection and tri-level logic programming. See
Figure 1
. Pin 6 has
internal resistor divider network to V
DD
and V
SS
. Refer to
Block Diagram on page 1
.
Tri-level Logic input control pin used to select Frequency and Bandwidth
.
Frequency/bandwidth selection and Tri-level Logic programming. See
Figure 1
. Pin 7 has
internal resistor divider network to V
DD
and V
SS
. Refer to Block Diagram on page 1.
Oscillator output pin connected to crystal
. Leave this pin unconnected If an external
clock drives Xin/CLK.
5
SSCC
I
6
S1
I
7
S0
I
8
Xout
O
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| CY25562 | Spread Spectrum Clock Generator(擴(kuò)頻時(shí)鐘發(fā)生器) |
| CY25812 | Clocks and Buffers |
| CY25814 | Clocks and Buffers |
| CY25818 | Clocks and Buffers |
| CY25819 | Clocks and Buffers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CY25562_08 | 制造商:CYPRESS 制造商全稱:Cypress Semiconductor 功能描述:Spread Spectrum Clock Generator |
| CY25562SC | 制造商:CYPRESS 制造商全稱:Cypress Semiconductor 功能描述:Spread Spectrum Clock Generator |
| CY25562SCT | 制造商:CYPRESS 制造商全稱:Cypress Semiconductor 功能描述:Spread Spectrum Clock Generator |
| CY25562SXC | 功能描述:鎖相環(huán) - PLL Spectrum Clk Genratr COM RoHS:否 制造商:Silicon Labs 類型:PLL Clock Multiplier 電路數(shù)量:1 最大輸入頻率:710 MHz 最小輸入頻率:0.002 MHz 輸出頻率范圍:0.002 MHz to 808 MHz 電源電壓-最大:3.63 V 電源電壓-最小:1.71 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:QFN-36 封裝:Tray |
| CY25562SXCT | 功能描述:鎖相環(huán) - PLL Spectrum Clk Genratr COM RoHS:否 制造商:Silicon Labs 類型:PLL Clock Multiplier 電路數(shù)量:1 最大輸入頻率:710 MHz 最小輸入頻率:0.002 MHz 輸出頻率范圍:0.002 MHz to 808 MHz 電源電壓-最大:3.63 V 電源電壓-最小:1.71 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:QFN-36 封裝:Tray |
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