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42781AG-08TT Datasheet(PDF) 2 Page - PulseCore Semiconductor

Part # 42781AG-08TT
Description  General Purpose EMI Reduction IC
Download  11 Pages
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Manufacturer  PULSECORE [PulseCore Semiconductor]
Direct Link  http://www.onsemi.com/
Logo PULSECORE - PulseCore Semiconductor

42781AG-08TT Datasheet(HTML) 2 Page - PulseCore Semiconductor

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October 2006
P2781/82/84
rev 1.6
General Purpose EMI Reduction IC
2 of 11
Notice: The information in this document is subject to change without notice.
Pin Configuration
Pin Description (P278xA)
Pin#
Pin Name
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.
2
XOUT
O
Crystal connection. If using an external reference, this pin must be left
unconnected.
3
FS1
I
Digital logic input used to select input frequency range
(see the Input Frequency Selection Table). This pin has an internal pull-up
resistor.
4
LF
I
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.
5
VSS
I
Ground Connection. Connect to system ground.
6
ModOUT
O
Spread Spectrum Clock Output.
7
FS0
I
Digital logic input used to select input frequency range
(see the Input Frequency Selection Table). This pin has an internal pull-up
resistor.
8
VDD
P
Connect to +3.3 V
Input Frequency Selection Table
Output Frequency Scaling (MHz)
FS1
FS0
Input (MHz)
P2781A
P2782A
P2784A
Modulation Rate (KHz)
0
0
3 to 9
3 to 9
6 to 18
12 to 36
Fin / 128
0
1
10 to 19
10 to 19
20 to 38
40 to 76
Fin / 256
1
0
20 to 38
20 to 38
40 to 76
80 to 152
Fin / 512
1
1
39 to 78
39 to 78
78 to 156
156 to 312
Fin / 1024
Standard pin Configuration offered in both
8 pin SOIC and TSSOP Packages
FS1
LF
FS0
VDD
VSS
1
2
3
4
5
6
7
8
P278xA
XIN / CLKIN
ModOUT
XOUT


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