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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 contr ol for multi-sync display monitors
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 2 ordering information part no. WT8043n16 WT8043n20p1 WT8043n20p4 WT8043n20p7 WT8043n20p8 WT8043n24 package p-dip 16l p-dip 20l p-dip 20l p-dip 20l p-dip 20l p-dip 24l (skinny type) 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 WT8043n20p1 f45k f36k vss 640x400 640x480 800x600(48k) 17 18 19 20 800x600(37.5k) 800x600(35k) 1024x768(57k) 1024x768 (i) f52k 640x350 1024x768 (ni) 13 1 2 3 4 5 6 7 8 9 10 11 12 14 15 16 oscin hsin oscout vsin h_out v_out vdd WT8043n20p4 f45k f36k vss f33k 640x400 640x480 800x600(48k) 17 18 19 20 800x600(37.5k) 800x600(35k) 1024x768(57k) 1024x768 (i) 640x350 1024x768 (ni) 13 1 2 3 4 5 6 7 8 9 10 11 12 14 15 16 oscin hsin oscout vsin h_out v_out vdd WT8043n20p7 f45k f36k vss f52k 640x400 640x480 800x600(48k) 17 18 19 20 800x600(37.5k) 800x600(35k) 1024x768(57k) 1024x768 (i) nec 1024x768 (ni) 13 1 2 3 4 5 6 7 8 9 10 11 12 14 15 16 oscin hsin oscout vsin h_out v_out vdd WT8043n20p8 f45k f36k vss f33k 640x400 640x480 800x600(48k) 17 18 19 20 800x600(46.8k,75) 800x600(37.5k) 1024x768(60k,75) 1024x768(i) 640x350 1024x768(57k) 13 1 2 3 4 5 6 7 8 9 10 11 12 14 15 16 oscin hsin oscout vsin h_out v_out vdd WT8043n16 f36k vss f33k 640x400 640x480 800x600(37.5k) 800x600(35k) 1024x768 (i) 640x350 13
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 2 1 2 3 4 5 6 7 8 9 10 11 12 14 15 16 oscin hsin oscout vsin v_out vdd WT8043n24 1280x1024 (64k) f60k f45k f36k vss f33k f72k 640x400 640x480 800x600(48k) 17 18 19 20 21 22 23 24 800x600(37.5k) 800x600(35k) 1024x768(57k) 1024x768 (i) f52k 640x350 1024x768 (ni) 13 h_out
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 3 absolute maximum ratings item symbol value unit digital supply voltage v dd 5.5 v horizontal sync. input voltage v hs v dd (5)+0.3 v vertical sync. input voltage v vs v dd (5)+0.3 v power dissipation p d 300 mw operating temperature range t opt 0~70 c storage temperature range t stg -40~125 c recommended operating conditions item symbol min. typ. max. unit digital supply voltage v dd (5) 4.5 5 5.5 v supply current (oscillator on) i p ma synchronous input voltage low v il 0.8 v synchronous input voltage high v ih 2.4 4 5.0 v horizontal synchronous frequency range f h 25 - 80 khz vertical synchronous frequency range f v 50 - 120 hz crystal clock frequency f clk 3.5764 3.58 3.5836 mhz open drain pull high voltage v oh 8 12 v
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 4 electrical characteristics (v dd =5v, t opt =25 c, crystal=3.58mhz) item symbol min. typ. max. unit f33k 32.95 - 33.05 khz f36.2k 36.15 - 36.25 khz discrimintaion of h. f45k 44.95 - 45.05 khz synchronous frequency f52k 51.95 - 52.05 khz f62k 61.95 - 62.05 khz f72k 71.95 - 72.05 khz output low (h-out, v-out) when i ol = 4ma v ol1 0.4 v output high (h-out, v-out) when i oh = -400 m a v oh1 2.4 v open collector output low when i ol = 6ma v ol2 0.4 v output sink current (h-out, v-out) when v ol1 = 0.4v i ol1 4 ma output drive current (h-out, v-out) when v oh1 = 2.4v ?y i oh1 ?y 400 m a open drain sink current when v ol2 = 0.4v i ol2 6 ma input h_sync pulse width w h_sync 0.56 4 m s input v_sync pulse width w v_sync 0.56 833 m s h_sync, output pulse delay, respect to hsin t dhs 60 ns v_sync, output pulse delay, respect to vsin t vhs 60 ns upper trigger input point (h_in, v_in) v utp 2.0 v lower trigger input point (h_in, v_in) v ltp 0.8 v noise margin (h_in, v_in) v nm 1.75 v
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 5 application information structure name function of terminal oscin a clock generating circuit is built into the chip. so if a resonator is connected to oscin / oscout, a clock signal can be obtained i oscout referent to oscin pin hsin input terminal of horizontal synchronous signal i, ttl compatible vsin input terminal of vertical synchronous signal i, ttl compatible h_out output pin, active low, fixed polarity of original h_sync signal w/ same pulse width o, ttl compatible 1280 x 1024 1280x1024 mode control output o, open drain v_out output pin, active low, fixed polarity of original v_sync signal w/ same pulse width o, ttl compatible f60k h, frequency input 60k discrimination > 60k then active low, < 60k then high o, open drain f52k > 52k then active low, < 52k then high o, open drain f45k > 45k then active low, < 45k then high o, open drain f36k > 36k then active low, < 36k then high o, open drain vss ground f33k > 33k then active low, < 33k then high o, open drain 640 x 350 mode seclect control output, if ibm vga 640x350 mode, or vesa vga 640x350 mode, then active low, else high state output o, open drain
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 6 (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 400 mode then active "low" o, open drain 640 x 480 if ibm vga 640 x 480 mode, or vesa vga 640 x 480 mode then active "low" o, 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 (46.8k,75) vesa new 75hz timing mode o, 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 (ni) ibm 8514/a non-interlace mode o, open drain 1024x768 (57k) xga 1024x768 mode hsync freq. 57khz o, open drain 1024x768 (60k, 75) vesa new 75hz timing mode o, open drain f72k hysnc freq. discrimination control output if > 72 khz then active low, else high o, open drain vdd 5 volts power supply
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 7 time chart hin - hout in_h in_h h_out w t h-sync dhs + - vin - vout in_v in_v v_out w t v-sync dvs + -
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 8 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 pad vdd type 3 pad vdd
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 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 block diagram i figure 1-1 WT8043n20p1 functional block diagram
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 11 block diagram ii figure 1-2 WT8043n24 functional block diagram
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 12 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 m s and vertical synchronous pulse width under 0.56 m s will be considered as noise.
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 13 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.
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 14 table 1: graphaic standard and frequencies ?i graphic standard resolution horizontal vertical polarities nec timing 640 x 400 24.8khz 56.4hz -,- 640 x 350 31.5khz 70hz +,- ibm vga 640 x 400 31.5khz 70hz -,+ 640 x 480 31.5khz 60hz -,- mac ii 640 x 480 35.0khz 67hz new 72hz 640 x 480 38.6khz 72hz -,+ vesa super vga 800 x 600 35.2khz 56hz ibm 8514/a interlaced 1024 x 768 35.5khz 86hz 640 x 350 37.5khz 83hz +,- vesa vga 640 x 400 37.5khz 83hz -,+ 640 x 480 37.5khz 72hz -,- vesa new 75hz timing 640 x 480 37.5khz 75hz -,- european super vga 800 x 600 37.5khz 60hz vesa new 75hz timing 800 x 600 46.8khz 75hz vesa new super vga 800 x 600 48.0khz 72hz ibm 8514/a non-interlaced 1024 x 768 48.5khz 60hz vesa new 1024 x 768 1024 x 768 56.5khz 72hz vesa new 75hz timing 1024 x 768 60.0khz 75hz work station 1280 x1024 1280 x 1024 64.0khz 60hz
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 15 figure 2: h/v frequency division and video mode 640x350 (32k, 70) (+,-) 640x400 (32k, 70) (-,+) 1024x768 (35k, 87) 640x350 (37k, 84) (+,-) 640x400 (37k, 84) (-,+) 640x480 (32k, 60) (-,-) 640x480 (37k, 73) (-,-) 1024x768 (48k, 60) 1024x768 (56.5k, 72) 800x600 (48k, 72) 800x600 (35k, 56) 800x600 (38k, 60) 1280x1024 (64k, 60) fv (hz) 78 64 30 73.5 11 28 33 36.2 45 52 62 fh(khz) 640x400 (24k, 56) 640x480 (35k, 67) mac ii 1024x768 (60k, 75) 832x624 (50k, 70) 800x600 (47k, 75) 640x480 (37k, 75) (-,-) 640x480 (38.6k, 72) (-,+) table 2: ibm vga/ vesa vga decoding table mode pin 640 x 480 640 x 400 640 x 350 640 x 480 0 1 1 ibm vga 640 x 400 1 0 1 640 x 350 1 1 0 640 x 480 0 1 1 vesa vga 640 x 400 1 0 1 640 x 350 1 1 0
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 16 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 f33k f36.2k f45k f52k f62k f72k hs < 33k 1 1 1 1 1 1 36.2k > hs > 33k 0 1 1 1 1 1 45k > hs > 36.2k 0 0 1 1 1 1 52k > hs > 45k 0 0 0 1 1 1 62k > hs > 52k 0 0 0 0 1 1 72k > hs > 62k 0 0 0 0 0 1 hs > 72k 0 0 0 0 0 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 vsin h_out v_out >15khz >30hz negative polarity hsin negative polarity vsin >15khz <30hz negative polarity hsin low state <15khz >30hz low state negative polarity vsin <15khz <30hz low state low state
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 17 application circuit i
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 18 application cirucit ii
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 19 physical dimension a b c d e f g 16l 754 250 130 100 130 355 300 20l 1024 250 130 100 130 355 300 24l skinny 1250 260 130 100 130 355 300 * dimension in mil * 1mm = 39.37 mil

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