November 2005

P1819

rev 1.7

Note Book LCD Panel EMI Reduction IC

2 of 9

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

VDD

VDD

Pin Configuration

Pin Description

Pin#

1819A/B/C/D 1819E/F/G/H/Q

Pin Name

Type

Description

1

1

XIN / CLKIN

I

Crystal Connection or external frequency input.This pin

has dual functions. It can be connected to either an

external crystal or an external reference clock

2

2

VSS

P

Ground Connection. Connect to system ground.

3

SRS

I

Spread range select. Digital logic input used to select

frequency deviation (Refer Spread Deviation Selection

Table). This pin has an internal pull-up resistor.

3

D_C / NC

I

Digital logic input used to select Down (LOW) or Center

(HIGH) spread options (Refer Spread Deviation

Selection Table). This pin has an internal pull-up

resistor.

4

4

ModOUT

O

Spread spectrum clock output. (Refer Input Frequency

and Modulation Rate Table and Spread Deviation

Selection Table)

5

5

REF

O

Non-modulated Reference clock output of the input

frequency.

6

6

PD#

I

Power down control pin. Pull LOW to enable Power-

Down mode. This pin has an internal pull-up resistor.

7

7

VDD

P

Power Supply for the entire chip.

8

8

XOUT

O

Crystal Connection. Input connection for an external

crystal. If using an external reference, this pin must be

left unconnected.

Note: Pin 3 is NC in P1819Q

PD#

XOUT

REF

1

2

3

4

5

6

7

8

P1819 A/B/C/D

XIN/ CLKIN

VSS

SRS

ModOUT

REF

1

2

3

4

5

6

7

8

P1819 E/F/G/H/Q

XIN / CLKIN

VSS

D_C / NC

ModOUT

PD#

XOUT