Overview

The EM639165 SDRAM is a high-speed CMOS synchronous DRAM containing 128 Mbits. It is internally

configured as 4 Banks of 2M word x 16 DRAM with a synchronous interface (all signals are registered on the

positive edge of the clock signal, CLK). 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.

特性 Features

? Fastaccess time from clock:5/5.4 ns

? Fast clock rate: 166/143 MHz

? Fully synchronous operation

? Internal pipelined architecture

? 2M word x 16-bit x 4-bank

? Programmable Mode registers

- CAS# Latency: 2, or 3

- Burst Length: 1, 2, 4, 8, or full page

- Burst Type: interleaved or linear burst

- Burst stop function

? Auto Refresh and Self Refresh

? 4096 refresh cycles/64ms

? CKE power down mode

? Single +3.3V power supply

? Interface: LVTTL

? 54-pin 400 mil plastic TSOP II package

? Lead-free package is available