參數(shù)資料
型號: P2784A-08TT
廠商: ALLIANCE SEMICONDUCTOR CORP
元件分類: XO, clock
英文描述: General Purpose EMI Reduction IC
中文描述: 312 MHz, OTHER CLOCK GENERATOR, PDSO8
封裝: TSSOP-8
文件頁數(shù): 2/11頁
文件大?。?/td> 169K
代理商: P2784A-08TT
July 2005
rev 1.5
Pin Configuration
Pin Description (P278XA)
Pin#
Pin Name
P2781/82/84
General Purpose EMI Reduction IC
2 of 11
Notice: The information in this document is subject to change without notice.
Type
Description
1
XIN/CLKIN
I
Connect to crystal or clock input. This pin has dual functions. It can be connected
either to an external crystal or an external reference clock.
Crystal connection. If using an external reference, this pin must be left
unconnected.
Digital logic input used to select input frequency range
(see the Input Frequency Selection Table). This pin has an internal pull-up
resistor.
External Loop Filter for the PLL. By changing the value of the CRC circuit, the
percentage spread can be adjusted accordingly. See the Loop Filter Selection
Table for detail value.
Ground Connection. Connect to system ground.
2
XOUT
O
3
FS1
I
4
LF
I
5
VSS
I
6
ModOUT
O
Spread Spectrum Clock Output.
Digital logic input used to select input frequency range
(see the Input Frequency Selection Table). This pin has an internal pull-up
resistor.
Connect to +3.3 V
7
FS0
I
8
VDD
P
Input Frequency Selection Table
Output Frequency Scaling (MHz)
P2781A
P2782A
3 to 9
6 to 18
10 to 19
20 to 38
20 to 38
40 to 76
39 to 78
78 to 156
FS1
FS0
Input (MHz)
P2784A
12 to 36
40 to 76
80 to 152
156 to 312
Modulation Rate (KHz)
0
0
1
1
0
1
0
1
3 to 9
10 to 19
20 to 38
39 to 78
Fin / 128
Fin / 256
Fin / 512
Fin / 1024
1
2
3
4
8
7
6
5
XIN / CLKIN
XOUT
FS1
LF
VDD
FS0
ModOUT
VSS
P278XA-08S
P278XA-08T
Standard pin Configuration offered in both
8 pin SOIC and TSSOP Packages
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