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P2781

General Purpose EMI Reduction IC

PulseCore Semiconductor 

October 2006

rev 1.6

Pin Configuration

XIN / CLKIN 1

XOUT 2

FS1 3

LF 4

P278xA

8 VDD

7 FS0

6 ModOUT

5 VSS

Standard pin Configuration offered in both

8 pin SOIC and TSSOP Packages

P2781/82/84

Pin Description (P278xA)

Pin#

1

2

3

Pin Name

XIN/CLKIN

XOUT

FS1

4

LF

5

VSS

6

ModOUT

7

FS0

8

VDD

Type

I

O

I

I

I

O

I

P

Description

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.

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

Input Frequency Selection Table

FS1 FS0 Input (MHz)

0

0

0

1

1

0

1

1

3 to 9

10 to 19

20 to 38

39 to 78

Output Frequency Scaling (MHz)

P2781A

P2782A

P2784A

3 to 9

6 to 18

12 to 36

10 to 19

20 to 38

40 to 76

20 to 38

40 to 76

80 to 152

39 to 78

78 to 156

156 to 312

Modulation Rate (KHz)

Fin / 128

Fin / 256

Fin / 512

Fin / 1024

General Purpose EMI Reduction IC

Notice: The information in this document is subject to change without notice.

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