WT8045
Synchronous Signal Discriminator and
Power Saving Detector for Green 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
May 4, 1995
DESCRIPTION
The WT8045 is a silicon monolithic circuit designed for synchronous signal processing and power
saving detection of multi-sync display monitors, which can cope 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.
The WT8045 incorporates many functional circuits, including horizontal/vertical frequency
discrimination, display mode selection, and synchronous pulse polarity and power saving detection,
into this single chip IC.
WT8045 is more convenient for you to shrink the PC board size and to reduce the material and labor
cost with fewer components.
FEATURES
Accepting two separated H&V synchronous signals with positive/ negative polarity.
Support VESA VGA (640X480, 640X400, 640X350), VESA SVGA (800X600), European
SVGA (800X600), VESA new SVGA (800X600), XGA (1024X768) and 1280x1024.
Capable of processing horizontal frequency between 25KHZ to 80KHZ.
Standard IBM video mode control outputs (1024X768, 640X480, 640X400, 640X350).
Five non-standard horizontal frequency control outputs in predefined frequency range.
Power saving mode - It can detect the conditions of monitor to decide which one will be selected
as following: ON/STANDBY/SUSPEND/OFF mode.
Fixed polarity outputs on both horizontal and vertical synchronous signals.
WT8045
Synchronous Signal Discriminator and
Power Saving Detector for Green 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
2
Power supply voltage: DC 5 volts; but for those pins with open-drain structure, such like the
mode select control output and frequency discrimination control output pins, can be connected to
12 volts through pull-high resistor.
APPLICATION
Auto size control for Multi-Sync Display Monitors
ORDERING INFORMATION
Part No.
Package
Note
WT8045N24P1
P-DIP 24L
V * 128
WT8045N24P3
P-DIP 24L
Without Mute
WT8045N24P4
P-DIP 24L
Without Mute
WT8045N24P5
P-DIP 24L
V * 1
WT8045N24P6
P-DIP 24L
With Mute
WT8045N24P7
P-DIP 24L
Without Mute
WT8045N24P8
P-DIP 24L
With Mute
WT8045N28P1
P-DIP 28L (skinny)
V * 128 Without Mute
WT8045N28P2
P-DIP 28L (skinny)
V * 128 Without Mute
WT8045N28P3
P-DIP 28L (skinny)
V * 1 Without Mute
WT8045N28P4
P-DIP 28L (skinny)
V * 128 With Mute
WT8045N28P5
P-DIP 28L (skinny)
V * 1 With Mute
WT8045N28P6
P-DIP 28L (skinny)
V * 1 Without Mute
WT8045N28P7
P-DIP 28L (skinny)
V * 128 With Mute
WT8045N28P8
P-DIP 28L (skinny)
V * 1 With Mute
WT8045N32
P-DIP 32L
--
WT8045
Synchronous Signal Discriminator and
Power Saving Detector for Green 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
3
PIN CONFIGURATION
1
2
3
4
5
6
7
8
9
10
11
12
14
15
16
OSCin
HSin
OSCout
VSin
H_out
V_out
VDD
WT8045N24P1
F43.5K
F36.2K
QV128
QVRC
Vss
QHRC
QH
640x400
640x480
800x600(48K)
17
18
19
20
21
22
23
24
800x600(37.5K)
800x600(35.2K)
1024x768(56.5K)
1024x768 (I)
F33K
640x350
1024x768 (NI)
13
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
OSCin
HSin
OSCout
VSin
H_out
V_out
VDD
WT8045N24P3
F43.5K
F36.2K
PM3
PM1
Vss
QHRC
QH
640x400
640x480
800x600(48K)
17
18
19
20
21
22
23
24
800x600(37.5K)
800x600(35.2K)
1024x768(56.5K)
1024x768 (I)
F33K
640x350
1024x768 (NI)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
OSCin
HSin
OSCout
VSin
Hout
Vout
VDD
WT8045N24P4
F36.2K
F33K
NC
NC
VSS
PM1
PM2
PM3
NC
640x350
(31.5K/37.5K)
640x480
(37.5K/72Hz)
640x400(31.5K)
17
18
19
20
21
22
23
24
640x480(31.5K)
800x600(35.2K)
NC
800x600(37.5K)
1024x768 (I)
1
2
3
4
5
6
7
8
9
10
11
12
14
15
16
OSCin
HSin
OSCout
VSin
H_out
V_out
VDD
WT8045N24P5
F43.5K
F36.2K
QV1
QVRC
Vss
QHRC
QH
640x400
640x480
800x600(48K)
17
18
19
20
21
22
23
24
800x600(37.5K)
800x600(35.2K)
1024x768(56.5K)
1024x768 (I)
F33K
640x350
1024x768 (NI)
13
WT8045
Synchronous Signal Discriminator and
Power Saving Detector for Green 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
4
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
OSCin
HSin
OSCout
VSin
H_out
V_out
VDD
WT8045N24P6
F43.5K
F36.2K
PM3
Mute
Vss
QHRC
QH
640x400
640x480
800x600(48K)
17
18
19
20
21
22
23
24
800x600(37.5K)
800x600(35.2K)
1024x768(56.5K)
1024x768 (I)
F33K
640x350
1024x768 (NI)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
OSCin
HSin
OSCout
VSin
H_out
V_out
VDD
WT8045N24P7
F43.5K
F36.2K
PM1
P52K
Vss
PM2
PM3
640x400
640x480
800x600(48K)
17
18
19
20
21
22
23
24
800x600(37.5K)
800x600(35.2K)
1024x768(56.5K)
1024x768 (I)
F33K
640x350
1024x768 (NI)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
OSCin
HSin
OSCout
VSin
H_out
V_out
VDD
WT8045N24P8
F43.5K
F36.2K
PM1+PM2
P52K
Vss
Mute
PM3
640x400
640x480
800x600(48K)
17
18
19
20
21
22
23
24
800x600(37.5K)
800x600(35.2K)
1024x768(56.5K)
1024x768 (I)
F33K
640x350
1024x768 (NI)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
OSCin
HSin
OSCout
VSin
H_out
V_out
VDD
WT8045N32
F43.5K
F36.2K
PM3
PM1
Vss
QHRC
640x400
640x480
800x600(48K)
17
18
19
20
21
22
31
32
800x600(37.5K)
800x600(35.2K)
1024x768(56.5K)
1024x768 (I)
F33K
640x350
1024x768 (NI)
30
29
28
27
26
25
24
23
QV128
QVRC
SELPIN
QH
-QH
F52K
F60K
PM2
1280x1024(64K)
WT8045
Synchronous Signal Discriminator and
Power Saving Detector for Green 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
5
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
OSCin
HSin
OSCout
VSin
H_out
V_out
VDD
WT8045N28P1
F43.5K
F36.2K
PM3
PM1
Vss
QHRC
640x400
640x480
800x600(48K)
17
18
19
20
21
22
800x600(37.5K)
800x600(35.2K)
1024x768(56.5K)
1024x768 (I)
F33K
640x350
1024x768 (NI)
28
27
26
25
24
23
QV128
QVRC
QH
F52K
PM2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
OSCin
HSin
OSCout
VSin
H_out
V_out
VDD
WT8045N28P3
F43.5K
F36.2K
PM3
PM1
Vss
QHRC
640x400
640x480
800x600(48K)
17
18
19
20
21
22
800x600(37.5K)
800x600(35.2K)
1024x768(56.5K)
1024x768 (I)
F33K
640x350
1024x768 (NI)
28
27
26
25
24
23
QV1
QVRC
QH
F52K
PM2
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