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AT45DB081B
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 1 k ? 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.
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.
9
2225J–DFLSH–2/08
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相关代理商/技术参数
AT45DB081B-TI-2.5
功能描述:闪存 8M SERIAL 2.7V - 2.5V IND TEMP 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
AT45DB081B-TU
功能描述:闪存 8M 28 I/O Pins SPI 264B 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
AT45DB081D
制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:8-megabit 2.5-volt or 2.7-volt DataFlash
AT45DB081D_07
制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:8-megabit 2.5-volt or 2.7-volt DataFlash
AT45DB081D_08
制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:8-megabit 2.5-volt or 2.7-volt DataFlash
AT45DB081D_09
制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:8-megabit 2.5-volt or 2.7-volt DataFlash
AT45DB081D_13
制造商:AD 制造商全称:Analog Devices 功能描述:8-megabit 2.5V or 2.7V DataFlash
AT45DB081D-DWF
制造商:Adesto Technologies Corporation 功能描述:WHOLE WAFER, NO BACKGRIND - Gel-pak, waffle pack, wafer, diced wafer on film