Austin Semiconductor MT42C4256
The SMJ44C251B/MT42C4256 multiport video RAM is a high-speed, dual-ported memory device. It consists of a dynamic random-access memory (DRAM) organized as 262144 words of 4 bits each interfaced to a serial-data register or serialaccess memory (SAM) organized as 512 words of 4 bits each.| Part No. | MT42C4256 |
|---|---|
| Datasheet | MT42C4256 Download |
| Manufacturer |  Austin Semiconductor |
| Description | 256K X 4 VRAM 256K x 4 DRAM |
| Buy | Stock & Price |
FEATURES
● Class B High-Reliability Processing● DRAM: 262144 Words × 4 Bits SAM: 512 Words × 4 Bits
● Single 5-V Power Supply (±10% Tolerance)
● Dual Port Accessibility–Simultaneous and Asynchronous Access From the DRAM and SAM Ports
● Bidirectional-Data-Transfer Function Between the DRAM and the Serial-Data Register
● 4 × 4 Block-Write Feature for Fast Area Fill Operations; As Many as Four Memory Address Locations Written per Cycle From an On-Chip Color Register
● Write-Per-Bit Feature for Selective Write to Each RAM I/O; Two Write-Per-Bit Modes to Simplify System Design
● Enhanced Page-Mode Operation for Faster Access
● CAS-Before-RAS (CBR) and Hidden Refresh Modes
● All Inputs/Outputs and Clocks Are TTL Compatible
● Long Refresh Period: Every 8 ms (Max)
● Up to 33-MHz Uninterrupted Serial-Data Streams
● 3-State Serial I/Os Allow Easy Multiplexing of Video-Data Streams
● 512 Selectable Serial-Register Starting
● Split Serial-Data Register for Simplified Real-Time Register Reload 28-...
