【技术】Alliance SRAM产品的基础知识和结构简介

时间： 2021-11-20 来源：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和低功耗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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技术探讨发布时间 : 2024-09-20

Alliance DRAM/SDRAM/SRAM/eMMC/闪存选型指南

描述- Alliance Memory is pleased to highlight our new product offerings in DRAM, SRAM, FLASH and eMMC in this new 2024 edition of our Product Selection Guide.We continue to be the premier legacy memory supplier offering high quality products, minimal die shrinks and long term support.

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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选型指南 - ALLIANCE - 2024V2 - 2024/6/11 PDF 英文下载

【产品】工作电流仅12mA的32M CMOS SRAM，专为低功耗应用

AS6C3216A-55TIN输入和输出均兼容TTL，SL版本的待机电流典型值仅为8μA。

新产品发布时间 : 2017-06-20

ALLIANCE PRODUCT CATALOG

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TXN,AS4C8M16SA-6TCN,AS4C64M16D1-6TXN,AS6CE4016B-45BIN,AS6C2016,AS6C1616B-45TIN,AS7C256B-XXPIN,AS4C16M16MSB,AS7C1024B-XXJIN,AS7C34098A-XXTXN,AS7C1025B-XXJCN,AS4C8M16SA-6BAN,AS4C256M16MD4-062BAN,AS6C62256-55STXN,AS25F3128MQ-6SIN,AS4C8M16SB-6TIN,AS7C34096A-XXJXN,AS4C512M16D4B-62BCN,AS4C2M32SA-6/7TXN,AS4C256M16D4A-62BXN,AS4C256M16D3C,AS6C8008-55ZIN,AS6C2008,AS4C32M16D1A,AS6C4008-55STIN,AS6C2008-55TIN,AS4C16M16MSB-6BIN,AS4C16M16MSA,AS4C4M32S,AS4C64M8D2,M29F800FB5AN6F2,AS4C16M16SB-6 TX,AS4C64M8D1,AS7C316096B-10BIN,AS7C31026B-XXJCN,AS7C31025B-XXJCN,AS4C32M16D2A,AS7C32098A,AS7C4098A-XXJXXN,AS4C32M16D2C,AS4C64M32MD1-5BXN,AS4C8M16D1A,AS7C38096A-10BIN,AS4C1G16D4-062BCN,AS4C1G8D4A-62BXN,AS6C1616B-55TIN,AS4C64M32MD1,AS7C256C-XXPCN,AS6C2008-55STIN,AS4C4M32D1A-5BXN,AS4C128M16D2-25BXN,AS6C8016B-45ZIN,AS4C8M32SA,AS25F316MQ-10S1IN,AS7C32096A,AS6C1008-55PIN,M45PE80-VMP6TG,AS4C16M16SA-6BIN,M29F400FT5AN6E2,AS4C32M16MD1A-5BCN,AS4C64M16D1A-6BIN,AS7C1026B,AS6C1008,AS7C513B,AS4C8M16D1,M29F800FB5AN6E2,AS6C6416-55BIN,AS4C512M32MD4V-046BIN,AS7C31025B-XXTJCN,AS9F14G08SA-45BAN,AS25F3512MQ-7W2INTR,AS5F14G04SND-10LIN,AS6C3216A,AS4C4M16SA-5TXN,AS7C1025B,AS9F34G08SA-25BIN,AS7C316096C-10TIN,N25Q032A13ESFA0F,AS4C32M16SC-7TIN,AS4C16M32SC-7TIN,AS4C32M16D3-10BCN,AS4C32M8SA-6 TXN,AS25F3256MQ-7W2INTR,AS6C6264-55SCN,AS4C32M16D1-5BXN,AS4C1M16S-6TXN,AS4C8M16SA-7BCN,AS4C8M16SA-6TIN,AS7C1024B,AS7C34098B-10TIN,AS4C32M16D2C-25BXN,AS4C16M16D1-5BXN,AS7C31026B-XXTCN,AS6C4016,AS7C3256A-XXJIN,AS9F18G08SA-45BAN,AS9F32G08SA-25BIN,AS7C1026B-XXJCN,AS4C4M16SA-7TCN,AS7C256A-XXJIN,AS7C4098A-XXTXXN,AS4C32M32MD1A-5BIN,AS7C38096B,AS4C128M16D3C,AS4C1G16D4A-62BCN,N25Q064A13EF8A0E,N25Q064A13EF8A0F,AS6C4008,AS4C64M8SC-7TIN,AS7C38096A,AS4C16M32MD1,AS4C16M16SA-6TIN,AS4C8M16D1A-5TXN,AS4C8M16D1-5BXN,AS4C256M8D2A-25BCN,AS5F32G04SNDA-08LIN,AS7C4098A-XXTXN,AS5F34G04SNDA-08LIN,AS6C1616B,AS4C16M32MD1-5BXN,AS4C512M16D3LA-10BXN,AS4C8M16MSA-6BIN,AS6C2016-55BIN,M29F400FB55N3E2,AS4C8M32S-6 TXN,AS6C4016B-45ZIN,AS1C512K16PL-70BIN,AS7C316096C-10BIN,AS4C8M16SA-6BIN,M29F400FB55N3F2,AS4C8M32SA-7 BXN,AS7C3513B-XXTCN,AS25F3256MQ-7S2INTR,AS7C513B-XXTCN,AS6C1008-55STIN,AS7CW2M16-10BIN,AS7C34098A-12JCNTR,AS4C512M8D3LC-10BAN,AS4C128M32MD2-18BIN,AS7C38098A,AS4C16M16SA-7BCN,AS4C4M16SA-6TIN,AS4C128M16D2,AS7C34098B-10BIN

选型指南 - ALLIANCE - V2 - 2024/10/3 PDF 英文下载

Product Discontinue Notification (PDN) for Alliance Memory 64Mb (4Mx16) and 128Mb (8Mx16) CellularRAM AD-MUX Low Power PSEUDO SRAM 49ball FBGA Package ( PDN#26042024R)

型号- AS1C8M16PL-70BIN,AS1C4M16PL-70BIN,AS1C8M16PL-70BINTR,AS1C4M16PL-70BINTR

产品变更通知及停产信息 - ALLIANCE - April 26th 2024 PDF 英文下载

【产品】16M伪静态随机存储器（PSRAM）AS1C1M16P-70BIN，助力移动电子设备应用

Alliance公司推出的AS1C1M16P-70BIN是使用DRAM型存储单元的16,777,216位伪SRAM，但该器件具有无刷新操作和极低功耗技术。此外，该接口兼容低功耗异步型SRAM。

新产品发布时间 : 2018-12-27

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

【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

Worldwide Leader in Legacy Memory PRODUCT CATALOG 2024

型号- AS4C8M16SA-7TXN,AS6C2008A,AS6C62256-55SXN,AS4C2M32S-7BXN,AS4C64M4SA-6TIN,ASFC64G31T5-51BIN,AS4C8M32MD2A-25BPCN,AS4C64M32MD2A-25BIN,AS5F18G04SND-10LIN,AS1C512K16P-70BIN,AS4C8M32MSB-6BIN,AS7C38096B-10BIN,ASFC32G31T3-51BIN,AS29CF160B-55TIN,AS4C16M16SA-6TXN,AS7C31025C-12JIN,AS4C256M16D3LC,AS4C16M32MSB,AS7C31024B-XXTCN,M29F160FT55N3E2,AS4C16M32MSA,AS4C64M16MD2A-25BIN,AS4C32M16MSB-6BIN,M29F800FT55N3E2,AS25F1128MQ-70WIN,AS7C1024B-XXJCN,AS5F34G04SNDB-08LIN,AS29CF800T-55TIN,AS4C8M16SA-6BXN,AS4C4M16SA-6TXN,AS9F38G08SA-25BIN,AS7C31025B-12TJIN,N25Q064A13ESFA0F,AS25F364MQ-10WIN,AS4C32M8D1-5TXN,AS9F31G08SA-25BIN,AS4C256M16D4-83BXN,38096A,AS7C31025B-XXJIN,AS1C1M16P-70BIN,AS25F34MD-10S1IN,AS6C6416-55TIN,AS4C128M8D2A-25BXN,256B,AS4C64M4SA-7TCN,256A,AS4C16M16SA -6TXN,AS4C32M8SA-7TCN,AS6C2008A-55TIN,AS4C16M16SA-6BXN,AS4C512M16D3LC-12BXN,AS7C1026B-XXTIN,AS7C325632-10BIN,AS6C2016-55ZIN,1008,AS4C16M16SA-7TXN,AS1C1M16PL-70BIN,AS4C128M16D3C-93BXN,N25Q064A13EF8H0E,AS6C4016B-45BIN,AS4C512M16D3LB,AS4C512M16D3LC,AS4C512M16D3LA,AS4C512M8D4A-75BXN,AS4C4M16D1A,AS4C512M16D4A-62BXN,AS4C4M32MSA,38098A,AS4C1G32MD4V-046BIN,AS7C34096B-10BIN,AS4C256M8D2,AS4C4M16SA-7TXN,AS6C1008-55PCN,AS7C164A-15PXN,1016,AS1C8M16PL-70BIN,AS6C1008-55SIN,AS4C64M16D1,AS4C256M16MD4V-062BAN,N25Q032A13ESCA0F,AS7C34098B,ASFC4G31M-51BIN,AS5F32G04SNDB-08LIN,AS4C4M16SA-6BXN,AS7C34098A,N25Q064A13EF640E,AS7C38098A-10BIN,316096A,AS7C3256A-XXTIN,AS4C32M16D3-12BXN,M45PE80-VMP6G,AS4C8M16SA-6TXN,AS4C32M16D3L-12BXN,AS7C1026B-XXTCN,ASFC10G31P3-51BIN,AS4C64M16D2B-25BCN,AS4C128M32MD2A-25BIN,AS7C4098A-XXJXN,AS4C512M16MD4V-053BIN,AS7C256A-XXTIN,AS4C1G8D3LA-10BXN,AS4C2M32S-6BXN,AS4C8M32S-6TXN,AS4C32M16SB-7TCN,AS4C256M16D3C-93BXN,AS4C128M16MD2A-25BIN,AS7C4096A-XXTXN,AS4C512M8D4-83BXN,2008,AS4C16M16MSA-6BIN,3216,AS6C8016B,AS6C1008-55TIN,AS7C38098A-10TIN,AS4C64M16MD1A-5BIN,A7C351232-10BIN,AS6C8016,316098A,AS7C34096A,AS9F14G08SA-45BIN,AS7C34096B-10TIN,AS6C1616B-45BIN,AS1C8M16PL-70BIN***,ASFC5G31P3-51BIN,2016,AS4C2M32SA-6 TXN,AS4C32M16MD1A,AS6C1616-55TIN,AS7C316098A,AS4C16M16MD1-6BCN,AS4C256M32MD4-062BAN,AS6C1016-55BIN,62256,1024B,AS29CF040-55CCIN,1024C,AS6C4008-55SIN,AS4C512M8D3LC-12BXN,AS6C4008-55PCN,AS4C64M16D3LB,AS6C1616B-55BIN,AS7C316096B-10TIN,AS4C8M32MSB,AS4C128M8D3B-12BXN,AS4C8M32MSA,AS4C4M16SA-7B2CN,AS5F31G04SND-08LIN,ASFC16G31M-51BIN,AS4C8M16SA-6TAN,AS4C32M16D1A-5TXN,AS4C128M16MD4V-062BAN,AS6C4008-70SAN,AS6C8008B-45BIN,AS4C32M16SB-7TXN,AS7C31024B-XXTJCN,AS4C8M32MD2A-25BCN,1025C,1025B,AS4C64M16MD1A,AS4C16M16SA -7BXN,AS7C32098A-XXTXN,AS25F304MD-10S1IN,AS7C3256A,AS25F1128MQ-70SIN,AS6C8016B-55ZIN,1026B,AS6C1608B-45BIN,M45PE16-VMW6TG,AS6C1016,AS6C4008-55BIN,AS7C351232,AS4C32M32MD1A,AS7C316096A-10TIN,AS4C8M16MSB-6BIN,M45PE20-VMN6P,34098A,AS4C256M16D3C-93BCN,AS4C16M32SB-6BXN,AS7C38096A-10TIN,AS4C8M16SA-6TCN,AS4C64M16D1-6TXN,AS6CE4016B-45BIN,AS6C2016,AS6C1616B-45TIN,AS7C256B-XXPIN,AS4C16M16MSB,AS7C1024B-XXJIN,AS7C34098A-XXTXN,AS7C1025B-XXJCN,AS4C8M16SA-6BAN,AS4C256M16MD4-062BAN,AS6C6264-55 SIN,AS4C64M16D,AS4C16M16SB-6TXN,AS6C62256-55STXN,AS4C8M16SB-6TIN,AS7C34096A-XXJXN,AS4C256M16D4A-62BXN,AS4C256M16D3C,AS7C316098 B,AS6C8008-55ZIN,6416,AS6C2008,AS6C4008-55STIN,AS4C32M16D1A,AS6C2008-55TIN,AS4C16M16MSB-6BIN,AS4C16M16MSA,AS4C4M32S,AS4C64M8D2,M29F800FB5AN6F2,AS4C64M8D1,AS7C316096B-10BIN,34096A,AS4C8M16SA-7BXN,AS7C31026B-XXJCN,AS7C31025B-XXJCN,AS4C32M8SA-6TXN,AS4C32M16D2A,AS7C32098A,AS4C32M16D2C,4008,AS4C64M32MD1-5BXN,AS4C8M16D1A,AS7C38096A-10BIN,AS4C1G16D4-062BCN,AS4C1G8D4A-62BXN,AS6C1616B-55TIN,AS4C64M32MD1,AS7C256C-XXPCN,AS6C6264-55 PIN,AS6C2008-55STIN,AS4C6,AS4C4M32S-7BXN,AS4C4M32D1A-5BXN,AS4C128M16D2-25BXN,AS6C8016B-45ZIN,AS4C16M16SB-7BXN,4016,AS4C8M32SA,AS4C4M32SA-6TXN,AS4C16M16SA -7TXN,AS25F316MQ-10S1IN,AS7C32096A,AS6C1008-55PIN,AS4C16M16SB-7TXN,AS4C16M16SA -6BXN,M45PE80-VMP6TG,AS4C4M32S-6BXN,AS4C16M16SA-6BIN,AS4C4M16SA-5TXN,M29F400FT5AN6E2,AS4C32M16MD1A-5BCN,AS4C64M16D1A-6BIN,AS7C1026B,AS6C1008,AS7C513B,AS4C16M16SB-6BXN,AS4C8M16D1,M29F800FB5AN6E2,3256B,AS6C6416-55BIN,3256A,AS4C512M32MD4V-046BIN,AS7C31025B-XXTJCN,AS9F14G08SA-45BAN,AS5F14G04SND-10LIN,AS4C4M16SA- 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

Worldwide Leader in Legacy Memory PRODUCT CATALOG 2024

选型指南 - ALLIANCE - 2024/7/3 PDF 英文下载收起

【产品】64Mbit高速CMOS伪静态随机存储器AS1C4M16PL-70BIN，专为低功耗便携式应用而开发

ALLIANCE推出的AS1C4M16PL-70BIN是为低功耗便携式应用而开发的高速CMOS伪静态随机存取存储器。 64Mb CellularRAM器件的DRAM内核组织为4 Meg x 16位。这些器件是业界标准闪存控制接口的变体，具有多路复用地址/数据总线。

新产品发布时间 : 2019-01-07

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

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

【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

AS6C1608B-45BIN 16M SRAM 48B BGA (6x8) Reliability Test Report

型号- AS6C1608B-45BIN

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

【产品】微瓦级待机功率的AS6C8016A SRAM芯片，采用全CMOS工艺技术生产，总容量达8Mb

AS6C8016A是由美国Alliance Memory公司推出的经典款静态随机存取存储器，该产品选用44引脚的TSOP2芯片级封装，容量达到了512K×16bit，可作为强大微处理器的主缓存使用。作为SRAM最大的特点就是在主机断电后，仍能通过由电池供电，继续保存已经存储在芯片中的数据。相比DRAM的优点在于不需要刷新电路就能保存内部存储的数据，而且更为快速、低功耗。

新产品发布时间 : 2018-11-06