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TVP3409-135CFN Datasheet(PDF) 7 Page - Texas Instruments |
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TVP3409-135CFN Datasheet(HTML) 7 Page - Texas Instruments |
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7 / 57 page  1–1 1 Introduction The TVP3409 is intended to be a direct replacement for the ATT20C409 RAM digital-to-analog converter (RAMDAC). The TVP3409 RAMDAC supports 8-bit multiplexed operation that can be input on 16 pixel terminals. The TVP3409 retains register compatiblity with the ATT20C498 and ATT20C499 devices. The TVP3409 features 24-bit packed pixel modes that provide 24-bit graphics at up to 1024 x 768 screen resolution. Dual clock synthesizers offer two programmable and two fixed frequencies in phase-locked-loop A (PLLA) and one programmable and three fixed frequencies in phase-locked-loop B (PLLB). After reset, the frequencies are: PLLA: 25.175, 28.322, 50, and 75 MHz PLLB: 30, 40, 50, and 60 MHz Easy identification of the RAMDAC allows the video BIOS to determine if a requested mode is available on the hardware being used. 1.1 Features • Functionally Interchangeable with ATT20C409 • 170/135 MHz (0.8 µm CMOS) – 170 MHz 2:1 Multiplex 8-Bit Pseudocolor – 73 MHz True Color • 16-Bit Pixel Port Usable as an 8-Bit Port – Compatible With ATT20C490 Using P(7–0) – Compatible With ATT20C498 Using P(15–0) • 9 Software Selectable Color Modes – 24-Bit Packed Pixel – 24-Bit True Color – 8-Bit Pseudocolor • Dual Programmable Clock Synthesizers – Pixel Clock and Memory Clock – Reset to 28.322-MHz and 25.175-MHz VGA Frequencies – Strobe Input Latches Frequency Select Lines • On-Chip PLL Clock Doubler – 85 MHz input – 170 MHz Pixel Output • 2:1 and 1:1 Pixel Multiplexing • Power Dissipation of 1.19 W at 135 MHz Typical • 256 × 24 Color RAM • Triple 8-Bit Monotonic Digital-to-Analog Converters (DACs) • Software Compatible With the AT&T ATT20C498/499/409 • 68-Terminal Plastic Leaded Chip Carrier (PLCC) Package |
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