WT8045N24P4

WT8045 Synchronous Signal Discriminator and Power Saving Detector for Green Monitor  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.  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 WT8045 Synchronous Signal Discriminator and Power Saving Detector for Green Monitor  • 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. WT8045N24P1 WT8045N24P3 WT8045N24P4 WT8045N24P5 WT8045N24P6 WT8045N24P7 WT8045N24P8 WT8045N28P1 WT8045N28P2 WT8045N28P3 WT8045N28P4 WT8045N28P5 WT8045N28P6 WT8045N28P7 WT8045N28P8 WT8045N32 Package P-DIP 24L P-DIP 24L P-DIP 24L P-DIP 24L P-DIP 24L P-DIP 24L P-DIP 24L P-DIP 28L (skinny) P-DIP 28L (skinny) P-DIP 28L (skinny) P-DIP 28L (skinny) P-DIP 28L (skinny) P-DIP 28L (skinny) P-DIP 28L (skinny) P-DIP 28L (skinny) P-DIP 32L Note V * 128 Without Mute Without Mute V*1 With Mute Without Mute With Mute V * 128 Without Mute V * 128 Without Mute V * 1 Without Mute V * 128 With Mute V * 1 With Mute V * 1 Without Mute V * 128 With Mute V * 1 With Mute --  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 WT8045 Synchronous Signal Discriminator and Power Saving Detector for Green Monitor  PIN CONFIGURATION WT8045N24P1 OSCin OSCout HSin VSin H_out V_out F43.5K F36.2K F33K QV128 QVRC Vss 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 1024x768(56.5K) WT8045N24P3 OSCin OSCout HSin VSin H_out V_out F43.5K F36.2K F33K Vss PM1 PM3 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 1024x768(56.5K) 1024x768 (NI) 1024x768 (I) 800x600(48K) 800x600(37.5K) 800x600(35.2K) 640x480 640x400 640x350 QH QHRC 1024x768 (NI) 1024x768 (I) 800x600(48K) 800x600(37.5K) 800x600(35.2K) 640x480 640x400 640x350 QH QHRC WT8045N24P4 OSCin OSCout HSin VSin Hout Vout F36.2K F33K NC NC VSS PM1 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 1024x768 (I) 800x600(37.5K) NC 800x600(35.2K) 640x480(31.5K) 640x400(31.5K) 640x480 (37.5K/72Hz) 640x350 (31.5K/37.5K) WT8045N24P5 OSCin OSCout HSin VSin H_out V_out F43.5K F36.2K F33K QV1 QVRC Vss 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 1024x768(56.5K) 1024x768 (NI) 1024x768 (I) 800x600(48K) 800x600(37.5K) 800x600(35.2K) 640x480 640x400 640x350 QH QHRC NC PM3 PM2  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 WT8045 Synchronous Signal Discriminator and Power Saving Detector for Green Monitor  WT8045N24P6 OSCin OSCout HSin VSin H_out V_out F43.5K F36.2K F33K Vss Mute PM3 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 1024x768(56.5K) WT8045N24P7 OSCin OSCout HSin VSin H_out V_out F43.5K F36.2K F33K Vss P52K PM1 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 1024x768(56.5K) 1024x768 (NI) 1024x768 (I) 800x600(48K) 800x600(37.5K) 800x600(35.2K) 640x480 640x400 640x350 QH QHRC 1024x768 (NI) 1024x768 (I) 800x600(48K) 800x600(37.5K) 800x600(35.2K) 640x480 640x400 640x350 PM3 PM2 WT8045N24P8 OSCin WT8045N32 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 VDD 1024x768(56.5K) OSCin OSCout HSin VSin H_out V_out F43.5K F36.2K F33K Vss P52K PM1+PM2 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 1024x768(56.5K) OSCout HSin VSin H_out 1024x768 (NI) 1280x1024(64K) 1024x768 (I) 800x600(48K) 800x600(37.5K) 800x600(35.2K) 640x480 640x400 640x350 QH QHRC PM3 PM2 PM1 1024x768 (NI) 1024x768 (I) 800x600(48K) 800x600(37.5K) 800x600(35.2K) 640x480 640x400 640x350 PM3 Mute V_out F43.5K F36.2K F33K QV128 QVRC Vss SELPIN -QH F52K F60K  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 WT8045 Synchronous Signal Discriminator and Power Saving Detector for Green Monitor  WT8045N28P1 OSCin OSCout HSin VSin H_out V_out F43.5K F36.2K F33K QV128 QVRC Vss F52K PM1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 VDD 1024x768(56.5K) 1024x768 (NI) 1024x768 (I) 800x600(48K) 800x600(37.5K) 800x600(35.2K) 640x480 640x400 640x350 QH QHRC PM3 PM2 WT8045N28P3 OSCin OSCout HSin VSin H_out V_out F43.5K F36.2K F33K QV1 QVRC Vss F52K PM1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 VDD 1024x768(56.5K) 1024x768 (NI) 1024x768 (I) 800x600(48K) 800x600(37.5K) 800x600(35.2K) 640x480 640x400 640x350 QH QHRC PM3 PM2  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 WT8045 Synchronous Signal Discriminator and Power Saving Detector for Green Monitor  WT8045N28P4 OSCin OSCout HSin VSin H_out V_out F43.5K F36.2K F33K QV128 QVRC Vss F52K PM1 +PM2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 VDD 1024x768(56.5K) WT8045N28P5 OSCin OSCout HSin VSin H_out V_out F43.5K F36.2K F33K QV1 QVRC Vss F52K PM1 +PM2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 VDD 1024x768(56.5K) 1024x768 (NI) 1024x768 (I) 800x600(48K) 800x600(37.5K) 800x600(35.2K) 640x480 640x400 640x350 QH QHRC PM3 Mute 1024x768 (NI) 1024x768 (I) 800x600(48K) 800x600(37.5K) 800x600(35.2K) 640x480 640x400 640x350 QH QHRC PM3 Mute Note: The Hout and Vout pin of N28P1, N28P3, N28P4 and N28P5 are negative pulse.  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 WT8045 Synchronous Signal Discriminator and Power Saving Detector for Green Monitor  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¡ ã0 7 -40¡ ã25 1 UNIT V VPP VPP mW ¢J ¢J RECOMMENDED OPERATING CONDITIONS ITEM Digital Supply Voltage Supply Current (Standby) Synchronous Input Voltage Low Synchronous Input Voltage High Horizontal Synchronous Frequency Range Vertical Synchronous Frequency Range Crystal Clock Frequency Open Drain Pull High Voltage Resistance of Monostable for Hsin Capacitance of Monostable for Hsin Resistance of Monostable for Vsin Capacitance of Monostable for Vsin SYMBOL VDD(5) IP VIL VIH FH FV FCLK VOH RH CH RV CV MIN. 4.5 TYP. 5 MAX. 5.5 13 0.8 5.5 80 (for N32) 120 3.5836 12 100 ¡Ð 500 ¡Ð UNIT V mA VPP VPP KHz Hz MHz V K£ [ pF K£ [ pF 2.4 25 50 3.5764 10 ¡Ð 10 ¡Ð 4 ¡Ð ¡Ð 3.58 100 100  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 WT8045 Synchronous Signal Discriminator and Power Saving Detector for Green Monitor  ELECTRICAL CHARACTERISTICS (VDD=5V, TOPT=25°C, Crystal=3.58MHz) ITEM SYMBOL F33K Discrimination of H. F36.2K Synchronous Frequency F43.5K F52K F60K Output Low (H-out, V-out), VOL1 when IOL = 4mA Output High (H-out, V-out), when IOH = -400£ g A Open Drain Output Low when IOL = 6mA Output Sink Current (H-out, V-out) when VOL1 = 0.4V Output Drive Current (H-out, V-out) when VOH1 = 2.4V Open Drain Sink Current when VOL2 = 0.4V Open Drain Sink Current when VOL2 = 5V VOH1 VOL2 IOL1 ¡ WOH1¡ W I IOL2 IOL2 10 40 MIN. 32.9 36.1 43.4 51.9 59.9 TYP. ¡Ð ¡Ð ¡Ð ¡Ð MAX. 33.1 36.3 43.6 52.1 60.1 0.4 UNIT KHz KHz KHz KHz KHz VPP VPP 2.4 0.4 4 400 VPP mA £g A mA mA  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 WT8045 Synchronous Signal Discriminator and Power Saving Detector for Green Monitor  MONO_STABLE DYNAMIC ELECTRICAL CHARACTERISTICS (Ta=25°C; Input tr,tf=20ns, CL=50PF) ITEM Input H_SYNC Pulse Width Input V_SYNC Pulse Width Output Pulse Transition Time Output Pulse Propagation Delay Output Pulse Width Adjust Range H_MONO_STB: 31KHz¡ Ð7.5KHz 3 31KHz¡ Ð8KHz 4 31KHz¡ Ð7KHz 5 31KHz¡ Ð4KHz 6 V_MONO_STB: (50Hz¡ Ð20Hz)*128 1 6.4KHz¡ Ð5.36KHz 1 (50Hz¡ Ð0Hz)*128 8 6.4KHz¡ Ð0.2KHz 1 (50Hz¡ Ð20Hz)*1 1 Typical Pulse width Variation as a function of Temperature at 75¢ Jto 24 ¢ J Typical Pulse Width Variation as a function of Supply Voltage at 4.75V to 5.25V Output Low (Sink) Current Output Voltage Low-Level Output Voltage High-Level Output Jitter (Hout & Vout) MIN. 0.558 0.0384 ¡Ð ¡Ð 10 TYP. ¡Ð ¡Ð 100 300 ¡Ð MAX. 4 0.125 200 600 90 UNITS £g s ms ns ns ¢M 26.66 20.83 17.54 15.62 £ £ £ £ s g s g s g s g 65.10 97.66 10 ¡Ð ¡Ð ¡Ó 2 £g s £g s ms ¢M ¡Ð 1 ¡Ð 4.95 ¡Ð ¡Ð 0 ¡Ó 2 6 0.05 ¡Ð 5 ¢M mA V V ns Hin & Vin Rise time and Fall time = 200ns  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 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 10 WT8045 Synchronous Signal Discriminator and Power Saving Detector for Green Monitor  APPLICATION INFORMATION Name OSCin OSCout Hsin Vsin H_OUT Function A clock generating circuit is built into the chip. So if a resonator is I connected to OSCin/OSCout, a clock signal can be obtained Refer to OSCin pin Input terminal of horizontal synchronous signal Input terminal of vertical synchronous signal O I, TTL compatible I, TTL compatible Output pin, fixed negative polarity of original H_SYNC signal with I, TTL same pulse width (but, positive for N28P2, N28P6,N28P7 and compatible N28P8) Output pin, fixed negative polarity of original V_SYNC signal with O, TTL same pulse width (but, positive for N28P2, N28P6,N28P7 and compatible N28P8) >43.5k then active low, 36.2k then active low, 33k then active low, 52k then active low, 60k then active low, < 60k then high Indicate in STAND-BY mode O, open drain O, open drain O, open drain -QH F52k F60k PM1  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 WT8045 Synchronous Signal Discriminator and Power Saving Detector for Green Monitor  Struncure of Terminal O, open drain O, open drain I Name PM2 PM3 QHRC QH 640¡ Ñ50 3 640¡ Ñ80 4 640¡ Ñ00 4 640¡ Ñ80 4 800¡ Ñ00 6 800¡ Ñ00 6 800¡ Ñ00 6 1024¡ Ñ 768(I) 1280¡ Ñ 1024 1024¡ Ñ 768(NI) 1024¡ Ñ 768(57k) Vdd Indicate in SUSPEND mode Indicate in OFF mode Function Input pin, connected to Vdd through RH & to ground through CH. Output pin, fixed positive polarity of horizontal signal; pulse width O, open drain depend upon RH & CH Mode select control output, if IBM VGA 640¡ Ñ50 mode, or VESA O, open drain 3 VGA 640¡ Ñ50 mode. Then active "low", else open state output 3 VESA VGA mode 640¡ Ñ80 (37.5k/72Hz) 4 O, open drain If IBM VGA 640¡ Ñ00 mode, or VESA VGA 640¡ Ñ00 mode then O, open drain 4 4 active "low" (640¡ Ñ00, 31.5k, for N24P4) 4 If IBM VGA 640¡ Ñ80 mode, or VESA VGA 640¡ Ñ80 mode then O, open drain 4 4 active "low" (640¡ Ñ80, 31.5k, for N24P4) 4 VESA super VGA mode (H_SYNC = 35.2k, V_SYNC = 56Hz) European super VGA mode (H_SYNC = 37.5k, V_SYNC = 60Hz) VESA new super VGA mode (H_SYNC = 48k, V_SYNC = 72Hz) IBM 8512/A interlace mode (H_SYNC = 35.5k, V_SYNC = 86Hz) 1280¡ Ñ024 mode control output 1 (H_SYNC = 64k, V_SYNC = 60Hz) IBM 8514/A non-interlace mode (H_SYNC = 48.5k, V_SYNC = 60Hz) XGA 1024¡ Ñ68 mode Hsync freq. 57kHz 7 (H_SYNC = 56.5k, V_SYNC = 72Hz) 5 Volts power supply O, open drain 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 12 WT8045 Synchronous Signal Discriminator and Power Saving Detector for Green Monitor  APPLICATION DESCRIPTION DPMS (Display Power Management Signaling) Detection As per DPMS proposal version 1.0P, revision 0.54P, WT8045 provides Monitor Power Management Detection Circuit for the convenience of monitor designers in designing power saving monitors, or the so called "Green Monitors". Please refer to the table 1 as below for power states defined in the DPMS. DPMS requires at least 5 seconds delay before transition from ON state to any power saving state, to avoid unintentionally entering a power saving state during display resolution changes and timing mode changes. And it can be done instantaneously, for the transition between any power saving state. Table 1 Display Power Management Summary Signals State On Stand-by Suspend Off Horizontal Pulses Vertical Pulses Video Active DPMS Compliance Requirement Mandatory Optional Mandatory Mandatory Power Savings None Minimal Substantial Maximum Recovery Time Not Applicable Short Longer System Dependent No Pulses Pulses Blanked Pulses No Pulses Blanked No Pulses No Pulses Blanked * "No-Pulse" represents the frequency of Hsin or Vsin less than or equal to 10Hz, but "Pulses" represents that frequency of Hsin greater than or equal to 10KHz and Vsin greater than or equal to 40Hz  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 WT8045 Synchronous Signal Discriminator and Power Saving Detector for Green Monitor  The way WT8045 implements VESA DPMS As shown on Table 2, WT8045 use PM1 to represent Stand-by State, PM2 as Suspend State and PM3 as OFF State. When H_SYNC / V_SYNC signals transition from ON State to any one of the three power saving states, WT8045 will delay 5.9 seconds to meet the VESA DPMS requirement: the minimum 5 seconds delay to avoid unintentionally entering a power saving state during display resolution and timing mode changes. If during this delay time period, H_SYN and V_SYN signals return to ON State, then all three power management pins (PM1, PM2 and PM3) will remain ON state. If power management state of H_SYNC and V_SYNC prolong for more than 5.9 seconds, then these three power management pins will change to the corresponding states. While changing from any power saving state back to ON State will take about 0.368 second for H_SYNC / VSYNC pulse checking. And transition between any power saving state will be done immediately. Table 2: The truth table of Power Saving Detector MODE ON STAND_BY SUSPEND OFF OVERRIDE Hsin Pulses No Pulses Pulses No Pulses No Pulses Manually Vsin Pulses Pulses No Pulses No Pulses No Pulses PWR ON PM1 1 0 0 0 1 PM2 1 1 0 0 1 PM3 1 1 1 0 1 OVERRIDE mode: To initial override, both horizontal and vertical sync signals shall be in the no pulses condition when the display is maintained during the entire time override is required. As soon as pulses are detected on horizontal and vertical sync signal. The display shall enter DPMS operation. Three power management pins are open drain structure and active low. If you do not need all those three power saving states in your design. You can just short two or three pins of the pins PM1/PM2/PM3. for example, by shorting pin PM1 and pin PM2, you will have only two power saving states, that is OFF and Suspend states, so you have three states total, including ON State. Please refer to Application Circuit 2.  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 WT8045 Synchronous Signal Discriminator and Power Saving Detector for Green Monitor  Mono_Stable Circuit WT8045 includes two sets of Mono_Stable Circuits, one uses H_SYNC as trigger signal, the other uses either H_SYNC or V_SYNC as trigger signal (this only can be done on 32 pin package, for 24 pin and 28 pin packages the trigger signal is fixed to H_SYNC); for N24p4 package, there is no mono-stable circuit. Please refer to the figure as below: H-SYNC vcc T QH Rx/Cx QH- V-SYNC SWITCH vcc T Q SELECT=OPEN QV SELECT=L QH SELECT Rx/Cx Q- The Mono_Stable Circuit is triggered by positive edge, no matter H_SYNC or V_SYNC is used as trigger signal. Please refer to the timing chart as below: Trigger Pulse positive negative Q Q- The output of Mono_Stable Circuit is open drain structure, and can be pulled up to +12V maximum.  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 WT8045 Synchronous Signal Discriminator and Power Saving Detector for Green Monitor  In case of using output pulse of V_MONO_STABLE as voltage source, in order to prevent the problem of slow response time, causing from the low frequency on vertical synchronous signal, WT8045 internally increases the vertical signal frequency to 128 times the original frequency, that is from 50Hz - 120 Hz to 6.4KHz - 15.36KHz. Then WT8045 uses this increased frequency as the input signal of MONO_STABLE, so the leading edge of the signal of the increased frequency will trigger the MONO_STABLE circuit. An external resistor (Rx) and an external capacitor (Cx) control the timing and accuracy of the circuit. Adjustment of Rx and Cx provides a wide range of output pulse widths from the Q and Q-bar terminals. The delay time from trigger input to output transition is independent of Rx and Cx. The minimum value of external resistor Rx is 10k ohms. The typical value of external capacitor Cx is 100 pF. The time period (T) for this multi-vibrator can be calculated with the formula: T ≈ 1.1 Rx • Cx. H/V Frequency Divisions and Video Modes Figure 1 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 IBM VGA, VESA VGA, European VGA/super VGA, VESA super VGA, IBM 8514/A, XGA, and 1280x 1024. WT8045 can determine 13 standard video modes for 32 pin package (refer to Table 3) according to H and V frequencies and polarities. 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. WT8045 pre-sets the discriminating points both on H and V frequencies. The discriminating points for H sync are 33KHz, 36.2KHz, 43.5KHz, 52KHz and 60KHz (for 32 pin). These discriminating points will be able to identify various video modes as shown in Fig. 1. WT8045 also provides the flexibility for users to define these discriminating points through mask option.  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 WT8045 Synchronous Signal Discriminator and Power Saving Detector for Green Monitor  The tolerance for H sync frequency discrimination is¡ Ó.1KHz. For instance, the 33KHz 0 discriminating point will be able to distinguish the H sync frequency that is either "less than or equal to" 32.9KHz, or "greater than or equal to" 33.1KHz. There is an ambiguous region between 32.9KHz and 33.1KHz. WT8045 has two discriminating points, 64Hz and 78Hz, for the V sync signal as shown in Fig.1. The tolerance is ¡ Ó.4Hz. The discrimination results of V sync frequency are used internally for 0 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. In case of these whole six modes decoding is needed, the horizontal frequency discrimination pin F33k or F36.2k must take into consideration. The horizontal frequency of IBM VGA mode is 31.5kHz, and VESA IBM VGA mode is 37.5kHz. Using F33k or F36.2k pin can clearly identify these two standard modes. The decoding circuit is attached on application section for reference. Graphic Standard IBM VGA VESA Super VGA IBM 8512/A Interlaced VESA VGA European Super VGA VESA New Super VGA IBM 8514/A Non-Interlaced VESA New 1024X768 Work Station 1280X1024 Resolution 640X350 640X400 640X480 800X600 1024X768 640X350 640X400 640X480 800X600 800X600 1024X768 1024X768 1280X1024 Horizontal 31.5kHz 31.5kHz 31.5kHz 35.2kHz 35.5kHz 37.5kHz 37.5kHz 37.5kHz 37.5kHz 48.0kHz 48.5kHz 56.5kHz 64.0kHz Vertical 70Hz 70Hz 60Hz 56Hz 86Hz 83Hz 83Hz 72Hz 60Hz 72Hz 60Hz 72Hz 60Hz Polarities +,-,+ -.- +,-,+ -,- Table 3: Graphic Standard and Frequencies  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 WT8045 Synchronous Signal Discriminator and Power Saving Detector for Green Monitor  Fv (Hz) 640X350 (+,-) 640x400 (-,+) 800X600 640X350 (+,-) 640x400 (-,+) 800X600 640X480 (-,-) 800X600 1024X768 640X480 (-,-) 1024X768 1280X1024 83.86 78 70.72 64 56.60 1024X768 0 31.5 33 35 36.2 38 48 43.5 52 56 64 Fh(KHz) 60 (58.5 for N28P2) Figure 1: H/V Frequency Division and Video Mode PIN Mode IBM VGA VESA VGA 640X480 640X400 640X350 640X480 640X400 640X350 640X480 0 1 1 0 1 1 640X400 1 0 1 1 0 1 640X350 1 1 0 1 1 0 Table 4: IBM VGA/ VESA VGA Decoding Table  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 WT8045 Synchronous Signal Discriminator and Power Saving Detector for Green Monitor  Horizontal Frequency Discriminator There are horizontal frequency discriminator pins on different type package: 33k, 36.2k (for N24P4 package); 33k, 36.2k, 43.5k (for 24 pin); 33k, 36.2k, 43.5k, 52k (for 28 pin); 33k, 36.2k, 43.5k, 52k, 60k (for 32 pin); please refer to table 5 for the logical truth table of these pins. These frequency discriminator pins output can be used for CS Capacitor Control directly as well as other application. Signa l Hsync HsHs>33k 43.5k>Hs>36k 52k>Hs>43.5k 60k>Hs>52k F33k F36k F43.5k F52k F60k 1 0 0 0 0 1 1 0 0 0 1 1 1 0 0 1 1 1 1 0 1 1 1 1 1 Table 5: Truth table of Frequency discriminator Mute function Timing 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 19 WT8045 Synchronous Signal Discriminator and Power Saving Detector for Green Monitor  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 20 WT8045 Synchronous Signal Discriminator and Power Saving Detector for Green Monitor  APPLICATION CIRCUITII  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 21 WT8045 Synchronous Signal Discriminator and Power Saving Detector for Green Monitor  APPLICATION CIRCUIT III  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 22 WT8045 Synchronous Signal Discriminator and Power Saving Detector for Green Monitor  APPLICATION CIRCUIT IV  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 23 WT8045 Synchronous Signal Discriminator and Power Saving Detector for Green Monitor  DIP OUTLINE DIMENSIONS N24 N28 SKINNY N32 A 1250 1385 1650 B 542 288 542 C 152 130 154 D 100 100 100 E 130 130 130 F 650 355 650 G 600 310 600 ¡ ¯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 24 WT8045 Synchronous Signal Discriminator and Power Saving Detector for Green Monitor  WT8045N28P2 OSCin OSCout HSin VSin H_out V_out F43.5K F36.2K F33K QV128 QVRC Vss F52K PM1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 VDD 1024x768(56.5K) WT8045N28P6 OSCin OSCout HSin VSin H_out V_out F43.5K F36.2K F33K QV1 QVRC Vss F52K PM1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 VDD 1024x768(56.5K) 1024x768 (NI) 1024x768 (I) 800x600(48K) 800x600(37.5K) 800x600(35.2K) 640x480(31.5K) 640x400 (31.5K/37.5K) 640x480(37.5K) QH QHRC PM3 PM2 1024x768 (NI) 1024x768 (I) 800x600(48K) 800x600(37.5K) 800x600(35.2K) 640x480(31.5K) 640x400 (31.5K/37.5K) 640x480(37.5K) QH QHRC PM3 PM2 WT8045N28P7 OSCin OSCout HSin VSin H_out V_out F43.5K F36.2K F33K QV128 QVRC Vss F52K PM1 +PM2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 VDD 1024x768(56.5K) WT8045N28P8 OSCin OSCout HSin VSin H_out V_out F43.5K F36.2K F33K QV1 QVRC Vss F52K PM1 +PM2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 VDD 1024x768(56.5K) 1024x768 (NI) 1024x768 (I) 800x600(48K) 800x600(37.5K) 800x600(35.2K) 640x480(31.5K) 640x400 (31.5K/37.5K) 640x480(37.5K) QH QHRC PM3 Mute 1024x768 (NI) 1024x768 (I) 800x600(48K) 800x600(37.5K) 800x600(35.2K) 640x480(31.5K) 640x400 (31.5K/37.5K) 640x480(37.5K) QH QHRC PM3 Mute Note: The Hout and Vout pin of N28P2, N28P6, N28P7 and N28P8 are positive pulse.  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 25