Description

The EDS2504AC/AP is a 256M bits SDRAM organized as 16,777,216 words × 4 bits × 4 banks. The EDS2508 AC/AP is a 256M bits SDRAM organized as 8,388,608 words × 8 bits × 4 banks. The EDS2516 AC/AP is a 256M bits SDRAM organized as 4194304 words × 16 bits × 4 banks. All inputs and outputs are referred to the rising edge of the clock input. It is packaged in standard 54-pin plastic TSOP (II).

Features

• 3.3V power supply

• Clock frequency: 133MHz (max.)

• LVTTL interface

• Single pulsed /RAS

• 4 banks can operate simultaneously and independently

• Burst read/write operation and burst read/single write operation capability

• Programmable burst length* (BL): 1, 2, 4, 8

• 2 variations of burst sequence

 - Sequential (BL = 1, 2, 4, 8)

 - Interleave (BL = 1, 2, 4, 8)

• Programmable /CAS latency (CL): 2, 3

• Byte control by DQM

: DQM (EDS2504AC/AP, EDS2508AC/AP)

: UDQM, LDQM (EDS2516AC/AP)

• Refresh cycles: 8192 refresh cycles/64ms

• 2 variations of refresh

 - Auto refresh

 - Self refresh