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参数资料
| 型号： | AT45DB021B-SU |
| 厂商： | ATMEL CORP |
| 元件分类： | DRAM |
| 英文描述： | 2-megabit 2.7-volt Only DataFlash |
| 中文描述： | 2M X 1 FLASH 2.7V PROM, PDSO8 |
| 封装： | 0.209 INCH, GREEN, PLASTIC, EIAJ, SOIC-8 |
| 文件页数： | 12/32页 |
| 文件大小： | 304K |
| 代理商： | AT45DB021B-SU |
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12
1937J–DFLSH–9/05
AT45DB021B
5.5
Pin Descriptions
SERIAL INPUT (SI):
The SI pin is an input-only pin and is used to shift data into the device. The
SI pin is used for all data input, including opcodes and address sequences.
SERIAL OUTPUT (SO):
The SO pin is an output-only pin and is used to shift data out from the
device.
SERIAL CLOCK (SCK):
The SCK pin is an input-only pin and is used to control the flow of data
to and from the DataFlash. Data is always clocked into the device on the rising edge of SCK and
clocked out of the device on the falling edge of SCK.
CHIP SELECT (CS):
The DataFlash is selected when the CS pin is low. When the device is not
selected, data will not be accepted on the SI pin, and the SO pin will remain in a high-impedance
state. A high-to-low transition on the CS pin is required to start an operation, and a low-to-high
transition on the CS pin is required to end an operation.
WRITE PROTECT:
If the WP pin is held low, the first 256 pages of the main memory cannot be
reprogrammed. The only way to reprogram the first 256 pages is to first drive the protect pin high
and then use the program commands previously mentioned. If this pin and feature are not uti-
lized it is recommended that the WP pin be driven high externally.
RESET:
A low state on the reset pin (RESET) will terminate the operation in progress and reset
the internal state machine to an idle state. The device will remain in the reset condition as long
as a low level is present on the RESET pin. Normal operation can resume once the RESET pin
is brought back to a high level.
The device incorporates an internal power-on reset circuit, so there are no restrictions on the
RESET pin during power-on sequences. If this pin and feature are not utilized it is recommended
that the RESET pin be driven high externally.
READY/BUSY:
This open-drain output pin will be driven low when the device is busy in an inter-
nally self-timed operation. This pin, which is normally in a high state (through a 1k
external
pull-up resistor), will be pulled low during programming operations, compare operations, and
during page-to-buffer transfers.
The busy status indicates that the Flash memory array and one of the buffers cannot be
accessed; read and write operations to the other buffer can still be performed.
6.
Power-on/Reset State
When power is first applied to the device, or when recovering from a reset condition, the device
will default to SPI Mode 3. In addition, the SO pin will be in a high-impedance state, and a high-
to-low transition on the CS pin will be required to start a valid instruction. The SPI mode will be
automatically selected on every falling edge of CS by sampling the inactive clock state. After
power is applied and V
CC
is at the minimum datasheet value, the system should wait 20 ms
before an operational mode is started.
相关PDF资料 |
PDF描述 |
|---|---|
| AT45DB021B-TU | 2-megabit 2.7-volt Only DataFlash |
| AT45DB021B-SC | 2-megabit 2.7-volt Only DataFlash?? |
| AT45DB021B-CC | 2-megabit 2.7-volt Only DataFlash?? |
| AT45DB021B-CI | 2-megabit 2.7-volt Only DataFlash?? |
| AT45DB021B-RC | 2-megabit 2.7-volt Only DataFlash?? |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AT45DB021B-TC | 功能描述:闪存 2M bit RoHS:否 制造商:ON Semiconductor 数据总线宽度:1 bit 存储类型:Flash 存储容量:2 MB 结构:256 K x 8 定时类型: 接口类型:SPI 访问时间: 电源电压-最大:3.6 V 电源电压-最小:2.3 V 最大工作电流:15 mA 工作温度:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体: 封装:Reel |
| AT45DB021BTI | 制造商:Atmel Corporation 功能描述: |
| AT45DB021B-TI | 功能描述:闪存 2M 2.7V RoHS:否 制造商:ON Semiconductor 数据总线宽度:1 bit 存储类型:Flash 存储容量:2 MB 结构:256 K x 8 定时类型: 接口类型:SPI 访问时间: 电源电压-最大:3.6 V 电源电压-最小:2.3 V 最大工作电流:15 mA 工作温度:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体: 封装:Reel |
| AT45DB021BTU | 制造商:Atmel Corporation 功能描述: |
| AT45DB021B-TU | 功能描述:闪存 DATAFLASH 2M SERIAL 2.7V IND TEMP GREEN RoHS:否 制造商:ON Semiconductor 数据总线宽度:1 bit 存储类型:Flash 存储容量:2 MB 结构:256 K x 8 定时类型: 接口类型:SPI 访问时间: 电源电压-最大:3.6 V 电源电压-最小:2.3 V 最大工作电流:15 mA 工作温度:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体: 封装:Reel |
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