【选型】ALLIANCE DDR3L ASC246M16D3LB替换镁光MT41K256M16TW可行性分析
内存价格一直像过山车般,让人捉摸不透,这也直接或间接的影响了所用颗粒DDR3L、DDR3、DDR4的供货情况。世强代理的ALLIANCE Memory以其供货稳定、产品生命周期长、价格基本不浮动的特点广受客户好评,并且坚持不停产、不缩die、不改版。
笔者曾在某铁路项目中使用Alliance 的DDR3L ASC256M16D3LB替换镁光MT41K256M16TW,现
以Alliance 的DDR3L ASC256M16D3LB替换镁光MT41K256M16TW做出一个分析,以使用户可以快速的将稳定的物料设计到产品中。
如下为二者参数对比:
如上图,红色部分存在差异:
1. ASC256M16D3LB只支持1600Mbps的数据速率,MT41K256M16TW有三种速率可选,如果用户主控配置数据速率等于或低于1600Mbps则可替换。2. 封装尺寸稍有差异。
引脚分布分析:
上图可以看出数据线DQU/DQ的分布有所差异,但是地址线均相同,所以引脚分布不存在替换问题。
再看一下外形尺寸,如下:
图中可以看出虽然外形尺寸存在差别,但是球距与球径是一样的,并且ASC256M16D3LB的外形是9x13.5mm均比MT41K256M16TW的两个96-ball的外形尺寸小,所以如果原来用的MT41K256M16TW的DDR3L则可用ASC256M16D3LB替换。
综上,ASC256M16D3LB替换MT41K256M16TW仅存在数据速率上的差异,在工业嵌入式系统中大多数主控支持的DDR速率是低于1600Mbps,所以ASC256M16D3LB替换MT41K256M16TW存在可行性。
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