ALLIANCE MEMORY AS4C4M32S-7BCN DRAM, SDRAM, 128 Mbit, 4M x 32bit, 143 MHz, TFBGA, 90 Pins

AS4C4M32S-7BCN is a high-speed CMOS, 4M x 32bit synchronous DRAM (SDRAM) containing 128Mbits. It is internally configured as a quad 1M x 32 DRAM with a synchronous interface (all signals are registered on the positive edge of the clock signal, CLK). Each of the 1M x 32-bit banks is organized as 4096 rows by 256 columns by 32 bits. Read and write accesses to the SDRAM are burst-oriented; accesses start at a selected location and continue for a programmed number of locations in a programmed sequence. Accesses begin with the registration of a BankActivate command which is then followed by a Read or Write command. An auto precharge function may be enabled to provide a self-timed row precharge that is initiated at the end of the burst sequence. By having a programmable mode register, the system can choose the most suitable modes to maximize its performance. It is well suited for applications requiring high memory bandwidth.

• Fully synchronous operation, internal pipelined architecture
• Programmable mode, CAS latency: 2 or 3, burst length: 1, 2, 4, 8, or full page
• Burst type: sequential and interleaved, burst-read-single-write
• Burst stop function, individual byte controlled by DQM0-3
• Auto refresh and self refresh
• 4096 refresh cycles/64ms
• Single 3.3V ±0.3V power supply, LVTTL interface
• 143MHz frequency
• 90-ball TFBGA package
• Commercial temperature range from 0 to 70°C