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WT8043N20P1 Schematic ( PDF Datasheet ) - ETC

Teilenummer WT8043N20P1
Beschreibung Synchronous Signal discriminator for Multi-Sync Display Monitor
Hersteller ETC
Logo ETC Logo 




Gesamt 20 Seiten
WT8043N20P1 Datasheet, Funktion
WT8043
Synchronous Signal discriminator
for Multi-Sync Display Monitor
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
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






WT8043N20P1 Datasheet, Funktion
WT8043
Application Information
Name
Function
OSCin
OSCout
HSin
A clock generating circuit is built into the chip. So if
a resonator is connected to OSCin / OSCout, a clock
signal can be obtained
Referent to OSCin pin
Input terminal of horizontal synchronous Signal
VSin
Input terminal of vertical synchronous Signal
H_out
Output pin, active low, fixed polarity of original
H_sync signal w/ same pulse width
1280 x 1024 1280x1024 mode control output
V_OUT
F60K
F52K
Output pin, active low, fixed polarity of original
V_sync signal w/ same pulse width
H, frequency input 60k discrimination > 60k then
active low, < 60k then high
> 52k then active low, < 52k then high
F45K
> 45k then active low, < 45k then high
F36K
> 36k then active low, < 36k then high
Vss
F33K
Ground
> 33k then active low, < 33k then high
640 x 350
Mode seclect control output, if IBM VGA 640x350
mode, or VESA VGA 640x350 mode, then active
low, else high state output
Structure
of
Terminal
I
I, TTL
Compatible
I, TTL
Compatible
O, TTL
Compatible
O,
open drain
O, TTL
Compatible
O,
open drain
O,
open drain
O,
open drain
O,
open drain
O,
open drain
O,
open drain
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
5

6 Page









WT8043N20P1 pdf, datenblatt
WT8043
Block Diagram II
Figure 1-2 WT8043N24 Functional Block Diagram
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
11

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