原创 N25S40

         N25S40是Nantronics半导体公司推出的一款4MB闪存芯片，该芯片采用了优秀的保护写入机制，并支持标准的SPI，同时很好地保护用户数据以避免由错误或擦除造成的损失。其主要应用在：机顶盒、DVD、电视机、蓝牙、MP3 播放器、DSL 调制解调器、光存储、硬盘、主板BIOS、打印机、数码相框、无线LAN、LCD 显示器、数字收音机等。

N25S40的采购信息如下：

 N25S40的主要功能特性包括：

1、Single power supply operation F

- Full voltage range: 2.7-3.6 volt

2、4 Mbit Serial Flash

- 4 M-bit/512 K-byte/2048 pages

- 256 bytes per programmable page

- Uniform 4K-byte Sectors

- Uniform 32K and 64K-byte Blocks 

3、Standard and Dual

- Standard SPI: CLK, CS#, DI, DO, WP#, HOLD#

- Dual SPI: CLK, CS#, DIO, DO, WP#, HOLD#

- Fast Read Dual Output instruction

- Auto-increment Read capability

4、High performance

- 104MHz clock rate for one data bit

- 85MHz clock rate for two data bits

5、Low power consumption

- 12 mA typical active current

- 1 uA typical power down current

6、Flexible Architecture with 4KB sectors

   - Sector Erase (4K-bytes)

- Block Erase (32K and 64K-bytes)

- Page Program up to 256 bytes

 - More than 100K erase/write cycles

 - More than 20-year data retention

7、Software and Hardware Write Protection:

- Write Protect all or portion of memory via software

- Enable/Disable protection with WP# pin

8、High performance program/erase speed

   - Page program time: 1.8ms typical

 - Sector erase time: 45ms typical

- Block erase time: 450ms typical

- Chip erase time: 3.5 Seconds typical

9、Package Options

-  8-pin SOIC 150/208-mil 

-  8-pad WSON 6x5-mm 

 -  8-pin PDIP 300-mil 

   -  All Pb-free packages are RoHS compliant

N25S40的功能框图如下：

N25S40的管脚图如下：