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参数资料
| 型号： | FD7720T-FREQ-T250 |
| 厂商： | PLETRONICS INC |
| 元件分类： | XO, clock |
| 英文描述： | CRYSTAL OSCILLATOR, CLOCK, 12 MHz - 32 MHz, LVCMOS OUTPUT |
| 封装： | ROHS COMPLIANT, CERAMIC, LCC-14 |
| 文件页数： | 7/12页 |
| 文件大小： | 185K |
| 代理商： | FD7720T-FREQ-T250 |
FD77T Series Multi-Output
CMOS Clock Oscillator
February 2008
www.pletronics.com
425-776-1880
4
The device can make only one of the setting of connections shown in the block diagram (only one pattern
stored in eePROM).
Output Buffers
Each output buffer can have 3 modes of operation:
1) Tri State
2) Active Low
3) The signal output of the Multiplexer
The output buffers for Out2 and Out3 and the output buffers Out6 and Out7 function as pairs. When
selecting on the function both outputs in the pair function the same.
There can be two options stored for the Output Buffers, State 0 and State 1. The eight Sx input settings
can have assigned one of the two Output Buffer states for each of Output Buffer sets.
This permits wired ‘OR’ of tri-state outputs, this permits setting total enable and disable functions of all
outputs.
Control Inputs
The three inputs, S0, S1/SDA and S2/SCL can be configured in two ways.
1) Used as 3 user inputs to permit up to 8 states, Sx input setting.
2) S0 used as an input to permit up to 2 states, S0 input setting. The SDA and SCL become clock and
data inputs to write to the FD77T internal setting memory. The interface follows the I
2C protocol. If the
SDA and SCL are not set then the internal eePROM sets the operation.
The S0, S1 and S2 input signals control and variations states allowed:
Inputs
PLL #1
PLL #2
PLL #3
PLL #4
Output
S2
S1
S0
SS
PLL
SS
PLL
SS
PLL
SS
PLL
123456
7
0
0/7
0/1
0/7
0/1
0/7
0/1
0/7
0/1
0
1
0/7
0/1
0/7
0/1
0/7
0/1
0/7
0/1
0
1
0
0/7
0/1
0/7
0/1
0/7
0/1
0/7
0/1
0
1
0/7
0/1
0/7
0/1
0/7
0/1
0/7
0/1
1
0
0/7
0/1
0/7
0/1
0/7
0/1
0/7
0/1
1
0
1
0/7
0/1
0/7
0/1
0/7
0/1
0/7
0/1
1
0
0/7
0/1
0/7
0/1
0/7
0/1
0/7
0/1
1
0/7
0/1
0/7
0/1
0/7
0/1
0/7
0/1
The MUX inputs are fixed independent of the Sx setting.
The Divider Values are fixed independent of the Sx setting
Specifying The FD77T Device For A Specific Application
Pletronics provides an EXCEL spreadsheet based program that assists in defining the FD77T functions.
The program only permits setting of parameters that will properly function. After defining the desired
functions, this spreadsheet is sent to Pletronics and the Configuration Part Number will then be assigned.
Pletronics uses the values in the spreadsheet to program the devices for shipment.
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| FD7720TL-25.0M-PLE | 制造商:PLETRONICS 制造商全称:Pletronics, Inc. 功能描述:Multi-Output CMOS Clock Oscillator |
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