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AS8NVLC512K32QC-20XT 参数 Datasheet PDF下载

AS8NVLC512K32QC-20XT图片预览
型号: AS8NVLC512K32QC-20XT
PDF下载: 下载PDF文件 查看货源
内容描述: 512K ×32模块的nvSRAM 3.3V高速SRAM与非易失性存储 [512K x 32 Module nvSRAM 3.3V High Speed SRAM with Non-Volatile Storage]
分类和应用: 存储静态存储器
文件页数/大小: 17 页 / 362 K
品牌: AUSTIN [ AUSTIN SEMICONDUCTOR ]
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SEMICONDUCTOR, INC.  
ADVANCE INFORMATION  
nvSRAM  
AS8nvLC512K32  
Austin Semiconductor, Inc.  
Best Practices  
nvSRAM products have been used effectively for over 15 years.  
While ease-of-use is one of the product’s main system values,  
experience gained working with hundreds of applications has resulted  
in the following suggestions as best practices:  
„ Power up boot firmware routines should rewrite the nvSRAM  
into the desired state (for example, autostore enabled). While the  
nvSRAM is shipped in a preset state, best practice is to again  
rewrite the nvSRAM into the desired state as a safeguard against  
events that might flip the bit inadvertently such as program bugs  
and incoming inspection routines.  
„ The nonvolatile cells in this nvSRAM product are delivered from  
Austin Semiconductor with 0x00 written in all cells. Incoming  
inspection routines at customer or contract manufacturer’s sites  
sometimes reprogram these values. Final NV patterns are typically  
repeating patterns of AA, 55, 00, FF, A5, or 5A. End product’s  
firmware should not assume an NV array is in a set programmed  
state. Routines that check memory content values to determine  
first time system configuration, cold or warm boot status, and so  
on should always program a unique NV pattern (that is, complex  
4-byte pattern of 46 E6 49 53 hex or more random bytes) as part  
of the final system manufacturing test to ensure these system  
routines work consistently.  
„ The VCAP value specified in this data sheet includes a minimum  
and a maximum value size. Best practice is to meet this requirement  
and not exceed the maximum VCAP value because the nvSRAM  
internal algorithm calculates VCAP charge and discharge time based  
on this max VCAP value. Customers that want to use a larger VCAP  
value to make sure there is extra store charge and store time should  
discuss their VCAP size selection with Austin Semiconductor to  
understand any impact on the VCAP voltage level at the end of a  
tRECALL period.  
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.  
AS8nvLC512K32  
Rev. 0.0 08/09  
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