【技术】Alliance SRAM产品的基础知识和结构简介

2021-11-20 Alliance
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SRAM代表着静态随机存取存储器,是许多硬件系统核心中的关键组成部分。ALLIANCE的该应用笔记旨在为读者介绍SRAM的基础知识和结构。


SRAM和DRAM均是随机存取存储器,只要存储器正常通电就可以存储数据。 如果断电,所有存储的数据都将丢失; 如果不定期刷新,DRAM数据可能会丢失,而在SRAM中无需刷新仍可正常存储数据。并且SRAM数据一旦成功写入,只要保持存储器的电源正常工作,就会一直保存在SRAM中。

图1 SRAM的基本架构

SRAM根据存储单元的类型而分成不同的存储器种类。大多数SRAM使用4晶体管或6晶体管存储单元。只要能够正常通电,这些单元结构就可以长久的存储数据。下图2显示了SRAM的4晶体管和6晶体管存储单元结构发展历史、DRAM的1晶体管存储单元结构发展历史。SRAM单元由交叉耦合的反相器构成;硬件系统的不断发展产生了不同类型的SRAM(分别称为4-T和6-T单元)。

图2 存储器单元的发展历史

SRAM基本上有两种不同的类型:同步SRAM和异步SRAM。同步SRAM是与外部信号时钟同步的存储器。而异步SRAM是不与外部信号时钟同步的存储器,但一旦其接收到要执行的指令,它们就会开始将数据读写到内存中;因为异步SRAM容易理解与设计,这些存储器通常根据其访问时间(即存储器接收到读取指令后输出数据所需的总时间)可细分为两个不同的类别:快速异步SRAM低功耗SRAM


快速异步SRAM:该系列SRAM,其通常工作在低于10~20ns的响应时间内。它们通常用于缓冲存储器应用、消费类产品等。快速异步SRAM已经使用了很长时间,已经有了稳定而成熟的市场应用。快速异步SRAM的存储密度范围从低于64K到4Mb,数据字大多配置为x8、x16。(这是每个内存位置可以存储的位大小)


低功耗SRAM:该系列SRAM,通常工作在45ns响应时间和更慢的响应速度范围内。 他们通常为低功耗设计,并且用于主要功率要求严苛的应用中。 低功耗SRAM的应用包括数字信号处理器 (DSP)、PDA、收音机、寻呼机、消费电子产品等。在这些应用中,低功耗SRAM用于临时数据存储以及暂存存储应用程序。 尽管低功耗SRAM也已存在多年,但最近消费电子产品的激增扩大了这些设备的市场应用范围。 低功耗SRAM的存储密度范围通常从64K到8Mb,并且大多配置为8位、16位的字宽。


Alliance Memory, Inc. 是传统SRAM产品的领先者之一; 此外,Alliance内存可提供16Mb和64Mb存储密度的同步DRAM,承诺支持传统SRAM产品并提供卓越的客户服务、交付和可靠性。

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型号- AS4C8M16SA-7TXN,AS6C2008A,AS6C62256-55SXN,ASFC64G31T5-51BIN,AS4C8M32MD2A-25BPCN,AS4C64M32MD2A-25BIN,AS5F18G04SND-10LIN,AS1C512K16P-70BIN,AS4C8M32MSB-6BIN,AS7C38096B-10BIN,ASFC32G31T3-51BIN,AS29CF160B-55TIN,AS4C16M16SA-6TXN,AS7C31025C-12JIN,AS7C31024B-XXTCN,M29F160FT55N3E2,AS4C64M16MD2A-25BIN,AS4C32M16MSB-6BIN,M29F800FT55N3E2,AS25F1128MQ-70WIN,AS7C1024B-XXJCN,AS5F34G04SNDB-08LIN,AS29CF800T-55TIN,AS4C8M16SA-6BXN,AS4C4M16SA-6TXN,AS9F38G08SA-25BIN,N25Q064A13ESFA0F,AS25F364MQ-10WIN,AS9F31G08SA-25BIN,AS4C32M8D1-5TXN,AS4C64M4SA-6 TXN,AS4C256M16D4-83BXN,AS7C31025B-XXJIN,AS4C8M16SA-6 TXN,AS1C1M16P-70BIN,AS4C8M16SA-7 BXN,AS25F34MD-10S1IN,AS6C6416-55TIN,AS4C128M8D2A-25BXN,AS6C2008A-55TIN,AS4C2M32S-7BXN,AS4C512M16D3LC-12BXN,AS4C2M32SA-7 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TXN,AS6C3216A,AS7C1025B,AS9F34G08SA-25BIN,AS7C316096C-10TIN,N25Q032A13ESFA0F,AS4C32M8SA-7TXN,AS4C32M16SC-7TIN,AS4C16M32SC-7TIN,AS4C32M16D3-10BCN,AS4C2M32SA-6TXN,AS6C6264-55SCN,AS4C32M16D1-5BXN,AS4C8M16SA-7BCN,AS4C8M32SA-7BXN,513B,AS4C8M16SA-6TIN,AS7C1024B,AS7C34098B-10TIN,AS4C32M16D2C-25BXN,AS4C16M16D1-5BXN,AS7C31026B-XXTCN,AS4C4M32SA-7TXN,AS6C4016,AS4C1M16S,AS9F18G08SA-45BAN,AS9F32G08SA-25BIN,AS7C256A-XXJIN,AS7C1026B-XXJCN,AS4C4M16SA-7TCN,AS4C1M16S-7TXN,AS4C32M32MD1A-5BIN,AS7C38096B,AS4C128M16D3C,AS4C64M4SA-7TXN,N25Q064A13EF8A0E,N25Q064A13EF8A0F,4096A,AS6C4008,AS4C64M8SC-7TIN,AS7C38096A,AS4C16M32MD1,AS4C16M16SA-6TIN,AS4C8M16D1A-5TXN,AS4C8M16D1-5BXN,AS4C256M8D2A-25BCN,AS7C4098A-XXTXN,AS5F32G04SNDA-08LIN,AS5F34G04SNDA-08LIN,AS6C1616B,AS4C16M32MD1-5BXN,AS4C1M16S-6TXN,AS4C512M16D3LA-10BXN,AS4C64M4SA-6TXN,AS4C8M16MSA-6BIN,AS6C2016-55BIN,3513B,M29F400FB55N3E2,31025B,AS6C4016B-45ZIN,31025C,AS1C512K16PL-70BIN,AS7C316096C-10BIN,AS4C8M16S

选型指南  -  ALLIANCE  - 2024/8/8 PDF 英文 下载 查看更多版本

【产品】4M(256K×16bit)低功率CMOS静态随机存取存储器,存取速度可达45 ns

Alliance的AS6C4016A是4M(256 K × 16 bit)存储容量的低功率CMOS静态随机存取存储器(SRAM)。与CYPRESS赛普拉斯存储器CY62147EV30LL-45ZSXI、CY62146GN30-45ZSXI、CY621472G30-45ZSXI属于pin对pin关系,但是AS6C4016A-45ZIN价格相比它们要便宜10%以上,在工业及汽车领域非常有优势。

新产品    发布时间 : 2018-07-28

AS6C1608B 16Mb (2048K × 8 Bits) LOW POWER CMOS SRAM

型号- AS6C1608BI,AS6C1608B,AS6C1608B-45,AS6C1608B-45TIN,AS6C1608B-45BIN,AS6C1608B-45BINTR,AS6C1608B-45TINTR

数据手册  -  ALLIANCE  - Rev. 1.0  - Feb.25.2022 PDF 英文 下载

8M低功耗CMOS SRAM,存取时间仅55ns!

AS6C8016-55TIN是Alliance Memory推出的一款8M低功耗CMOS SRAM,30mA的工作电流典型值以及1.5µA的待机电流,使其可应用于便携设备中。

新产品    发布时间 : 2016-09-22

AS6C8016 512K X 16 BIT SUPER LOW POWER CMOS SRAM Data Sheet

型号- AS6C8016-55,AS6C8016-55ZIN,AS6C8016 -55BIN,AS6C8016-55BIN,AS6C8016 -55ZIN,AS6C8016

数据手册  -  ALLIANCE  - V 1.0  - NOVEMBER/2007 PDF 英文 下载

Alliance Memory AS6C8016A SRAM数据手册

型号- AS6C8016A,AS6C8016A-55BIN,AS6C8016A-55BINTR,AS6C8016A-55ZIN

数据手册  -  ALLIANCE  - Rev. 2.0  - 2013年03月01日 PDF 英文 下载

Alliance Memory AS6C1008 SRAM数据手册

型号- AS6C1008-55STIN,AS6C1008-55PCN,AS6C1008-55TIN,AS6C1008-55BIN,AS6C1008-55SIN,AS6C1008,AS6C1008-55PIN

数据手册  -  ALLIANCE  - V 1.a  - 2007年10月01日 PDF 英文 下载

【产品】64M Bits低功耗CMOS静态随机存取存储器AS6C6416

Alliance公司推出的AS6C6416系列是67,108,864-bit低功率CMOS静态随机存取存储器(static random access memory,SRAM)。AS6C6416系列适用于低功率的系统应用,特别适合于电池备份的非易失性存储器应用。

新产品    发布时间 : 2017-12-27

Product Change Notification (PCN) for Alliance 4M,8M & 16M ‘A’DIE LOW POWER SRAMS(20200923/SM)

型号- AS6C4016A-45ZINTR,AS6C4016-55ZIN,AS6C4016A-45BINTR,AS6C8016B-55BINTR,AS6C8008A-45ZIN,AS6C4016-55ZINTR,AS6C4016-55BIN,AS6C8016A-55BINTR,AS6C1616A-55BIN,AS6C8016B-55BIN,AS6C8008-55ZINTR,AS6C8016-55ZINTR,AS6C4016-55BINTR,AS6C1616-55BINTR,AS6C8016-55ZIN,AS6C4016A-45ZIN,AS6C1616-55BIN,AS6C8016A-55ZINTR,AS6C1616A-55BINTR,AS6C8016A-55BIN,AS6C8008-55ZIN,AS6C8008A-45ZINTR,AS6C4016A-45BIN,AS6C8016A-55ZIN

产品变更通知及停产信息  -  ALLIANCE  - REVISION*A  - 23rd September 2020 PDF 英文 下载

测试报告  -  ALLIANCE  - Rev : A  - 2023.09.05 PDF 英文 下载

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可定制变压器支持60W-600W范围,额定电流最高10A,漏感稳定度最小3%;支持开关变压器、电流感测变压器、栅极驱动变压器、LLC谐振变压器、PoE变压器等产品定制。SPQ为5K。

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