TI DP8521AV-25

The DP8520A 21A 22A are CMOS Video RAM controllers that incorporate many advanced features including the capabilities of address latches, refresh counter, refresh clock, row, column and refresh address multiplexor, delay line, refresh access, VRAM transfer cycle arbitration logic and high capacitive drivers. The programmable system interface allows any manufacturer’s microprocessor or bus to directly interface via the DP8520A 21A 22A to VRAM arrays up to 64 Mbytes in size.

• On chip high precision delay line to guarantee critical VRAM access timing parameters
• microCMOS process for low power
• High capacitance drivers for RAS, CAS, DT, OE and VRAM address on chip
• On chip support for nibble, page and static column VRAMs
• Byte enable signals on chip allow byte writing in a word size up to 16 bits with no external logic
• Selection of controller speeds 20 MHz and 25 MHz
• On board Port A, Port B (DP8522A only) refresh arbitration logic
• Direct interface to all major microprocessors (application notes available)
• 4 RAS and 4 CAS drivers (the RAS and CAS configuration is programmable)