MT42C4256 Datasheet | Micross

VRAM SMJ44C251B MT42C4256 256K X 4 VRAM 256K x 4 DRAM with 512K x 4 SAM AVAILABLE AS MILITARY SPECIFICATIONS - SMD 5962-89497 - MIL-STD-883 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 patible - Long Refresh Period: Every 8 ms (Max) - Up to 33-MHz Uninterrupted Serial-Data Streams -...