AD120 datasheet(5/13 Pages) AMICC

5 / 13 page

AD120

PRELIMINARY

(August, 2001, Version 0.0)

AMIC Technology, Inc

Description

Operation

Output signals OUT0~OUT257 are used for control of the TFT gates of the LCD panel.

A bi-directional shift register is

implemented to sequentially output signals OUT0~OUT257. A clock pulse CP is applied to the bi-directional shift register and

the direction of the register is controlled by

R /L signal.

When

R /L is LOW and either starting signal ST1 or ST2 goes to HIGH, the shift register starts shifting from OUT0 to OUT257.

The voltages of the corresponding outputs switch to VH, VL or VOFF depending on the starting signals as shown in the

diagram. The outputs of the starting signals ST1X / ST2X switch accordingly after 256 CP pulses following start of the shift

When

R /L is HIGH and either starting signal ST1X or ST2X goes to HIGH, the shift register starts shifting from OUT257 to

OUT0. The voltages of the corresponding outputs switch to VH, VL or VOFF depending on the starting signals as shown in the

diagram. The outputs of the starting signals ST1/ST2 switch accordingly after 256 CP pulses following start of the shift register

which allows expansion of the outputs by cascading more devices.

3-Level Output

VH - VL = 40V(max.)

VOFF - VL = 0~10V

VH - VSS = 17~28V

OUT

Level

VDD

VSS

VOFF

AD120 Datasheet(PDF) 5 Page - AMIC Technology