WT8043

Synchronous Signal discriminator

for Multi-Sync Display Monitor

Weltrend

Semiconductor,

Inc.

2F., No. 24, Industry E. 9th Rd.

Science-Based Industrial Park

Hsin-Chu, Taiwan, R.O.C.

Tel:

886-35-780241

Fax: 886-35-770419

1

Jan. 30, 1996

Description

The WT8043 is a silicon monolithic circuit designed for synchronous signal

processing of multi-sync display monitors capable of coping with many kinds of PC's

and workstations. It can be applied to display monitors supporting standard IBM

VGA, VESA super VGA and IBM 8514/A video modes. It can also be used in other

high-end display monitors supporting non-standard video modes with user-defined

horizontal/vertical frequency ranges.

WT8043

incorporates

many

functional

circuits,

horizontal/vertical

frequency

discrimination, display mode selection, and synchronous pulse polarity detection, into

a single chip. Therefore, by using WT8043, monitor makers can shrink the PC board

size, reduce the material cost with fewer components, and reduce labor cost as well.

Features

•

Accepting separate H&V Synchronous signals with any polarities

•

Support VESA VGA (640x480, 640x400, 640x350), VESA SVGA (800x600),

European SVGA (800x600), VESA new SVGA (800x600), XGA (1024x768)

and 1280x1024.

•

Also including NEC (24K) mode, 3 VESA New 75Hz timing modes and Apple

MAC II (35k) mode.

•

Capable of processing horizontal frequency from 25KHz to 80KHz

•

Capable of processing vertical frequency from 50Hz to 120Hz

•

Standard IBM video mode control outputs (1024x768, 640x480, 640x400,

640x350)

•

Six non-standard horizontal frequency control outputs with predefined frequency

range. (users can define their own horizontal frequency range)

•

Fixed polarity horizontal and vertical synchronous signals output

•

Power supply voltage: 5V, but mode select control output and frequency

discrimination control output, these open collector outputs can be combined with

pull high resistor, pull up to 12V.

Application

•

Auto size control for Multi-Sync Display Monitors