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Features
● Fast access time from clock: 5.4/5.4 ns
● Fast clock rate: 166/143 MHz
● Fully synchronous operation
● Internal pipelined architecture
● 1M 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: Sequential or Interleaved
— Burst stop function
— Optional drive strength control
● Operating temperature range
— Commercial (0 ~ 70°C)
— Industrial (-40 ~ 85°C)
● Auto Refresh and Self Refresh
● 4096 refresh cycles/64ms
● CKE power down mode
● Single +3.3V ± 0.3V power supply
● Interface: LVTTL
● 54-pin 400 mil plastic TSOP II package
● 54-ball 8.0 x 8.0 x 1.2mm (max) FBGA package
— All parts ROHS Compliant
Overview
The 64Mb SDRAM is a high-speed CMOS synchronous DRAM containing 64 Mbits. It is internally configured as 4 Banks of 1M 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 Bank Activate command which is then followed by a Read or Write command.
The SDRAM provides for programmable Read or Write burst lengths of 1, 2, 4, 8, or full page, with a burst termination option. An auto precharge function may be enabled to provide a self-timed row precharge that is initiated at the end of the burst sequence. The refresh functions, either Auto or Self Refresh are easy to use. By having a programmable mode register, the system can choose the most suitable modes to maximize its performance. These devices are well suited for applications requiring high memory bandwidth and particularly well suited to high performance PC applications.
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