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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 VDD VHS VVS PD TOPT TSTG Value 5.5 VDD(5)+0.3 VDD(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 VDD (5) IP VIL VIH FH FV FCLK VOH 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
(VDD=5V, TOPT=25C, Crystal=3.58MHz) Item Symbol F33K F36.2K F45K F52K F62K F72K VOL1 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 A mA S S nS nS V 0.8 1.75 V V
Discrimintaion of H. Synchronous Frequency
Output Low (H-out, V-out) When IOL = 4mA Output High (H-out, V-out) VOH1 2.4 When IOH = -400A Open Collector Output Low VOL2 When IOL = 6mA Output Sink Current (H-out, IOL1 V-out) When VOL1= 0.4V Output Drive Current (H-out, yOH1 y I V-out) When VOH1= 2.4V Open Drain Sink Current IOL2 When VOL2= 0.4V Input H_SYNC Pulse Width WH_SYNC 0.56 Input V_SYNC Pulse Width WV_SYNC 0.56 TDHS H_SYNC, Output Pulse delay, respect to Hsin TVHS V_SYNC, Output Pulse delay, respect to Vsin VUTP Upper Trigger Input Point 2.0 (H_IN, V_IN) VLTP Lower Trigger Input Point (H_IN, V_IN) VNM 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
WT8043
Application Information
Name OSCin Function 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 Input terminal of vertical synchronous Signal Structure of Terminal I
OSCout
HSin VSin 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 F45K F36K Vss F33K 640 x 350
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 > 45k then active low, < 45k then high > 36k then active low, < 36k then high Ground > 33k then active low, < 33k then high Mode seclect control output, if IBM VGA 640x350 mode, or VESA VGA 640x350 mode, then active low, else high state output
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
WT8043
(Contd.) Structure Name Function of Terminal NEC NEC 640 x 400, 24.8kHz/ 56.4Hz timing mode O, open drain 640 x 400 If IBM VGA 640 x 400 mode, or VESA VGA 640 x O, 400 mode then active "low" open drain 640 x 480 If IBM VGA 640 x 480 mode, or VESA VGA 640 x O, 480 mode then active "low" open drain 800 x 600 VESA super VGA mode Hsync freq. 35kHz O, open drain 800 x 600 European super VGA mode Hsync freq. 37.5kHz O, open drain 800 x 600 VESA new 75Hz Timing mode O, (46.8k,75) open drain 800 x 600 VESA new super VGA mode Hsync freq. 48kHz O, open drain 1024x768 (I) IBM 8514/A interlace mode O, open drain 1024x768 IBM 8514/A non-interlace mode O, (NI) open drain 1024x768 XGA 1024x768 mode Hsync freq. 57kHz O, (57k) open drain 1024x768 VESA new 75Hz Timing mode O, (60k, 75) open drain F72K Hysnc freq. discrimination control output if > 72 kHz O, then active low, else high open drain VDD 5 Volts power supply
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
6
WT8043
Time Chart
*
Hin - Hout
W H-SYNC IN_H + IN_H -
H_OUT T dhs
*
Vin - Vout
W V-SYNC IN_V + IN_V -
V_OUT T dvs
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
7
WT8043
Structure of Terminal
Type 1
PAD Open Drain NMOS can pull up by external resistor, no connector must be pull down or floating.
Type 2
VDD
PAD
Type 3
VDD
PAD
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
8
WT8043
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
9
WT8043
Block Diagram I
Figure 1-1 WT8043N20P1 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
10
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
WT8043
Appication Description
General Description Figure 1-1 and 1-2 is a simplified functional block diagram of the WT8043. It includes the following functional blocks: sync pulse polarity detector; horizontal and vertical frequency discriminator, mode selector. The Sync pulse polarity detector accepts separete H and V sync signals with any polarities. It determines their polarities and sends the polarity information to the mode selector for video mode selection. It alos generates -H and -V signals in spite of their input polarities. The H and V frequency discriminator determines the frequency range of H and V sync signals. The mode selector determines which operating video mode it should be, according to the frequency range and polarity of H and V sync signals. The operating video modes include the standard IBM VGA (640x350, 640x400, 640x480), super VGA (800x600) and IBM8514/A (Inerlaced, Non-interlaced), VESA VGA & SVGA mode, VESA new SVGA mode, XGA (1024x768), and 1280x1024 mode, also including NEC 24kHz and 3 VESA New 75Hz timing modes. The mode selector also generates output signals that represent the frequency range of H. sync signal. The H sync signal is divided into 6 frequency ranges (3 ranges for WT8043N20) according to Fig. 2, WT8043 has preset the discriminating points between frequency ranges. However, it also offers the flexibility for providing user-defined discriminating points for non-standard video modes. The digital noise filter is used for rejecting noise on the incoming horizontal and vertical synchronous signals. The input section uses two techniques to improve noise rejec-tion. So the low level noise and the large short duration noise spikes will be rejected. Horizontal synchronous pulse width under 0.56 s and vertical synchronous pulse width under 0.56 s will be considered as noise.
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
12
WT8043
H/V Frequency Divisions and Video Modes Figure 2 illustrates the typical frequency ranges of H and V sync signals for display monitors. The operating video modes are determined by the H and V frequencies, and occasionally, by their polarities. The typical video modes of display monitors include the NEC 24k mode, IBM VGA, VESA VGA, European VGA/Super VGA, Apple MAC II, VESA Super VGA, IBM 8514/A,3 VESA New 75Hz modes, XGA, and 1280x 1024. WT8043 can determine 18 standard video modes (as shown in Table 1) according to H and V frequencies and polari-ties. These standard video modes include the IBM VGA, VESA VGA, VESA super VGA and IBM 8514/A. This provides the users with the capability to adjust the screen size for different modes. WT8043 pre-sets the discriminating points both on H and V frequencies. The discriminating points for H sync are 33KHz, 36.2KHz, 45KHz, 52KHz, 62KHz and 72KHz. These discriminating points will be able to identify various video modes as shown in Fig. 2. WT8043 also provides the flexibility for users to define these discriminating points through mask option. The tolerance for H sync frequency discrimination is 0.05KHz. For instance, the 33KHz discriminating point will be able to distinguish the H sync frequency that is either "less than or euqal to" 32.95KHz, or "greater than or equal to" 33.05KHz. There is an ambiguous region between 32.95KHz and 33.05KHz. WT8043 has three discriminating points, 64Hz, 73.5Hz and 78Hz, for the V sync signal as shown in Fig.2. The tolerance is 0.01Hz. The discrimination results of V sync frequency are used internally for mode selection. Base on the package consideration, IBM VGA mode and VESA VGA mode (both have same resolution: 640x480, 640x400, 640x350) are decoded on same open Drain structure output pins (e.g. pin 14 to pin 16 for N20P1 pin type package). In case of these whole 6 modes decoding is needed, the horizontal frequency discrimination pin F33k or F36k must take into consideration. The horizontal frequency of IBM VGA mode is 31.4kHz, and VESA IBM VGA mode is 37.5kHz. Using F33k or F36k pin can clearly identify these two standard modes. The decoding circuit is attached on application section for reference.
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
13
WT8043
Table 1: Graphaic Standard and Frequencies I Graphic Standard NEC Timing Resolution 640 x 400 640 x 350 IBM VGA 640 x 400 640 x 480 Mac II New 72Hz VESA Super VGA IBM 8514/A interlaced 640 x 480 640 x 480 800 x 600 1024 x 768 640 x 350 VESA VGA 640 x 400 640 x 480 VESA New 75Hz Timing European Super VGA VESA New 75Hz Timing VESA New Super VGA 640 x 480 800 x 600 800 x 600 800 x 600 Horizontal 24.8KHz 31.5KHz 31.5KHz 31.5KHz 35.0KHz 38.6KHz 35.2KHz 35.5KHz 37.5KHz 37.5KHz 37.5KHz 37.5KHz 37.5KHz 46.8KHz 48.0KHz 48.5KHz 56.5KHz 60.0KHz 64.0KHz Vertical Polarities 56.4Hz 70Hz 70Hz 60Hz 67Hz 72Hz 56Hz 86Hz 83Hz 83Hz 72Hz 75Hz 60Hz 75Hz 72Hz 60Hz 72Hz 75Hz 60Hz +,-,+ -,-,-,+ -,+,-,+ -,-
IBM 8514/A Non-interlaced 1024 x 768 VESA New 1024 x 768 VESA New 75Hz Timing Work Station 1280 x1024 1024 x 768 1024 x 768 1280 x 1024
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
14
WT8043
Figure 2:
Fv (Hz)
H/V Frequency Division and Video Mode
1024X768 (35k, 87)
640X350 (37k, 84) (+,-) 640X400 (37k, 84) (-,+) 640X480 (37k, 75) (-,-) 832X624 (50k, 70) 800X600 (47k, 75) 1024X768 (60k, 75)
78
73.5
640X350 (32k, 70) (+,-) 640X400 (32k, 70) (-,+) 640X400 (24k, 56) 640X480 (32k, 60) (-,-)
640X480 (35k, 67) MAC II
640X480 (37k, 73) (-,-) 640X480 (38.6k, 72) (-,+)
800X600 (48k, 72)
1024X768 (56.5k, 72)
64
800X600 (35k, 56)
800X600 (38k, 60)
1024X768 (48k, 60)
1280X1024 (64k, 60)
30 11 28 33 36.2 45 52 62 Fh(KHz)
Table 2: IBM VGA/ VESA VGA Decoding Table PIN Mode 640 x 480 IBM VGA 640 x 400 640 x 350 640 x 480 VESA VGA 640 x 400 640 x 350
640 x 480 0 1 1 0 1 1
640 x 400 1 0 1 1 0 1
640 x 350 1 1 0 1 1 0
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
15
WT8043
Horizontal Frequency Discriminator There are 3 horizontal frequency discriminator pins on 20 pin type package: 36.2kHz, 45kHz, 52kHz (for N20P1), 33kHz, 36.2kHz, 45kHz (for N20P4); 2 frequency discriminator pins on 16 pin type package: 33kHz, 36.2kHz and 6 frequency discriminator pins on 24 pin type package: 33kHz, 36.2kHz, 45kHz, 52kHz, 62kHz and 72kHz. Please refer to table 3 for the logical truth table of these pins. These frequency discriminator pins can pull up to +12V through a resistor, sink current to the open drain structure must keep under 6mA (ref. P4 Electrical Characteristics). These frequency discriminator pins output can be used for CS Capacitor Control directly as well as other application. Table 3: Truth table of Frequency discriminator Signal Hsync Hs < 33k 36.2k > Hs > 33k 45k > Hs > 36.2k 52k > Hs > 45k 62k > Hs > 52k 72k > Hs > 62k Hs > 72k F33K F36.2K F45K 1 0 0 0 0 0 0 1 1 0 0 0 0 0 1 1 1 0 0 0 0 F52K 1 1 1 1 0 0 0 F62K 1 1 1 1 1 0 0 F72K 1 1 1 1 1 1 0
SYNC Output State Description Both H_out / V_out duplicate Hsin/Vsin in the same frequency and pulse width, but are fixed at negative polarity. And H_out/ V_out have their own cut-off frequency: 15kHz for H_Sync and 30Hz for V_Sync. While the frequency of input signal is less than the cut-off frequency, the output will keep in low state. Please refer to the Table 4. Table 4: Hsin >15kHz >15kHz <15kHz <15kHz Vsin >30Hz <30Hz >30Hz <30Hz H_out Negative polarity Hsin Negative polarity Hsin Low state Low state
Semiconductor,
V_out Negative polarity Vsin Low state Negative polarity Vsin Low state
Inc.
Weltrend
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
16
WT8043
Application Circuit I
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
17
WT8043
Application Cirucit II
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
18
WT8043
Physical Dimension
A 16L 754 20L 1024 24L skinny 1250
B 250 250 260
C 130 130 130
D 100 100 100
E 130 130 130
F 355 355 355
G 300 300 300
* Dimension in mil * 1mm = 39.37 mil
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
19

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