P1819 ALSC [Alliance Semiconductor Corporation], P1819 Datasheet - Page 2

• Manufacturer Part Number: P1819
• Description: Notebook LCD Panel EMI Reduction IC
• Manufacturer: ALSC [Alliance Semiconductor Corporation]

November 2005
rev 1.7
Pin Configuration
Pin Description
1819A/B/C/D
Note: Pin 3 is NC in P1819Q
1
2
3
4
5
6
7
8
XIN/ CLKIN
Pin#
ModOUT
1819E/F/G/H/Q
VSS
SRS
1
2
3
4
5
6
7
8
3
1
2
4
Notice: The information in this document is subject to change without notice.
Note Book LCD Panel EMI Reduction IC
P1819 A/B/C/D
XIN / CLKIN
Pin Name
D_C / NC
ModOUT
XOUT
SRS
VDD
VSS
REF
PD#
7
5
8
6
XOUT
VDD
PD#
REF
Type
O
O
O
P
P
I
I
I
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
Spread range select. Digital logic input used to select
frequency deviation (Refer Spread Deviation Selection
Table). This pin has an internal pull-up resistor.
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.
Spread spectrum clock output. (Refer Input Frequency
and Modulation Rate Table and Spread Deviation
Selection Table)
Non-modulated Reference clock output of the input
frequency.
Power down control pin. Pull LOW to enable Power-
Down mode. This pin has an internal pull-up resistor.
Crystal Connection. Input connection for an external
crystal. If using an external reference, this pin must be
left unconnected.
Ground Connection. Connect to system ground.
Power Supply for the entire chip.
XIN / CLKIN
D_C / NC
ModOUT
VSS
3
1
2
4
P1819 E/F/G/H/Q
Description
7
5
8
6
VDD
XOUT
REF
PD#
2 of 9
P1819