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
WT8043
Ordering Information
Part No.
WT8043N16 WT8043N20P1 WT8043N20P4 WT8043N20P7 WT8043N20P8 WT8043N24
P-DIP 24L
Package P-DIP 16L
P-DIP 20L
P-DIP 20L
P-DIP 20L
P-DIP 20L
(skinny type)
Pin Configuration
WT8043N20P1
OSCin
OSCout
HSin
VSin
H_out
V_out
F52K
F45K
F36K
Vss
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
VDD
1024x768(57K)
WT8043N20P8
OSCin
OSCout
HSin
VSin
H_out
V_out
F45K
F36K
Vss
F33K
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
VDD
1024x768(60K,75)
1024x768 (NI)
1024x768 (I)
800x600(48K)
800x600(37.5K)
800x600(35K)
640x480
640x400
640x350
1024x768(57K)
1024x768(I)
800x600(48K)
800x600(46.8K,75)
800x600(37.5K)
640x480
640x400
640x350
WT8043N16
WT8043N20P4
OSCin
OSCin
OSCout
HSin
VSin
H_out
V_out
F45K
F36K
Vss
F33K
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
VDD
1024x768(57K)
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
VDD
1024x768 (I)
800x600(37.5K)
800x600(35K)
640x480
640x400
640x350
F33K
OSCout
HSin
VSin
H_out
V_out
F36K
Vss
1024x768 (NI)
1024x768 (I)
800x600(48K)
800x600(37.5K)
800x600(35K)
640x480
640x400
640x350
WT8043N20P7
OSCin
OSCout
HSin
VSin
H_out
V_out
F52K
F45K
F36K
Vss
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
VDD
1024x768(57K)
1024x768 (NI)
1024x768 (I)
800x600(48K)
800x600(37.5K)
800x600(35K)
640x480
640x400
NEC
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
2
WT8043
WT8043N24
OSCin
OSCout
HSin
VSin
H_out
1280x1024
(64k)
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
VDD
F72K
1024x768(57K)
1024x768 (NI)
1024x768 (I)
800x600(48K)
800x600(37.5K)
800x600(35K)
640x480
640x400
640x350
F33K
V_out
F60K
F52K
F45K
F36K
Vss
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
2
WT8043
Absolute Maximum Ratings
Item
Digital Supply Voltage
Horizontal Sync. Input Voltage
Vertical Sync. Input Voltage
Power Dissipation
Operating Temperature Range
Storage Temperature Range
Symbol
V
DD
V
HS
V
VS
P
D
T
OPT
T
STG
Value
5.5
V
DD
(5)+0.3
V
DD
(5)+0.3
300
0~70
-40~125
Unit
V
V
V
mW
°C
°C
Recommended Operating Conditions
Item
Digital Supply Voltage
Supply Current (Oscillator on)
Synchronous Input Voltage
Low
Synchronous Input Voltage
High
Horizontal Synchronous
Frequency Range
Vertical Synchronous
Frequency Range
Crystal Clock Frequency
Open Drain Pull High Voltage
Symbol
V
DD
(5)
I
P
V
IL
V
IH
F
H
F
V
F
CLK
V
OH
2.4
25
50
3.5764
4
-
-
3.58
8
0.8
5.0
80
120
3.5836
12
Min.
4.5
Typ.
5
Max.
5.5
Unit
V
mA
V
V
KHz
Hz
MHz
V
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
3
WT8043
Electrical Characteristics
(V
DD
=5V, T
OPT
=25°C, Crystal=3.58MHz)
Item
Symbol
F33K
F36.2K
F45K
F52K
F62K
F72K
V
OL1
Min.
32.95
36.15
44.95
51.95
61.95
71.95
Typ.
-
-
-
-
-
-
Max.
33.05
36.25
45.05
52.05
62.05
72.05
0.4
Unit
KHz
KHz
KHz
KHz
KHz
KHz
V
V
0.4
4
400
6
4
833
60
60
V
mA
µA
mA
µS
µS
nS
nS
V
0.8
1.75
V
V
Discrimintaion of H.
Synchronous Frequency
Output Low (H-out, V-out)
When I
OL
= 4mA
Output High (H-out, V-out)
V
OH1
2.4
When I
OH
= -400µA
Open Collector Output Low
V
OL2
When I
OL
= 6mA
Output Sink Current (H-out,
I
OL1
V-out) When V
OL1
= 0.4V
Output Drive Current (H-out,
¡ ½
OH1
¡ ½
I
V-out) When V
OH1
= 2.4V
Open Drain Sink Current
I
OL2
When V
OL2
= 0.4V
Input H_SYNC Pulse Width W
H_SYNC
0.56
Input V_SYNC Pulse Width W
V_SYNC
0.56
T
DHS
H_SYNC, Output Pulse delay,
respect to Hsin
T
VHS
V_SYNC, Output Pulse delay,
respect to Vsin
V
UTP
Upper Trigger Input Point
2.0
(H_IN, V_IN)
V
LTP
Lower Trigger Input Point
(H_IN, V_IN)
V
NM
Noise Margin (H_IN, V_IN)
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
4
