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AT45DB321E bảng dữ liệu(PDF) 44 Page - Dialog Semiconductor

tên linh kiện AT45DB321E
Giải thích chi tiết về linh kiện  32-Mbit DataFlash (with Extra 1-Mbits), 2.3V Minimum SPI Serial Flash Memory
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AT45DB321E
8784L–DFLASH–3/2019
Note:
P = Page Address Bit B = Byte/Buffer Address Bit X = Dummy Bit
15.
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 output pin (SO) 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 (Mode 3 or Mode 0) will be automatically selected on every falling
edge of CS by sampling the inactive clock state.
15.1
Initial Power-Up Timing Restrictions
As the device initializes, there will be a transient current demand. The system needs to be capable of providing this
current to ensure correct initialization. During power-up, the device must not be accessed for at least the minimum t
VCSL
time after the supply voltage reaches the minimum VCC level. While the device is being powered-up, the internal Power-
On Reset (POR) circuitry keeps the device in a reset mode until the supply voltage rises above the maximum POR
threshold value (V
POR). During this time, all operations are disabled and the device will not respond to any commands.
After power-up, the device will be in the standby mode.
If the first operation to the device after power-up will be a program or erase operation, then the operation cannot be
started until the supply voltage reaches the minimum V
CC level and an internal device delay has elapsed. This delay will
be a maximum time of t
PUW.
Table 15-1. Power-Up Timing
D1h
1
1
0
1
0
0
0
1
X
X
X
X
X
X
X
X
X
X
X
X
X
X
B
B
B
B
B
B
B
B
B
B
N/A
D2h
1
1
0
1
0
0
1
0
X
P
P
P
P
P
P
P
P
P
P
P
P
P
B
B
B
B
B
B
B
B
B
B
4
D3h
1
1
0
1
0
0
0
1
X
X
X
X
X
X
X
X
X
X
X
X
X
X
B
B
B
B
B
B
B
B
B
B
N/A
D4h
1
1
0
1
0
1
0
0
X
X
X
X
X
X
X
X
X
X
X
X
X
X
B
B
B
B
B
B
B
B
B
B
1
D6h
1
1
0
1
0
1
1
0
X
X
X
X
X
X
X
X
X
X
X
X
X
X
B
B
B
B
B
B
B
B
B
B
1
D7h
1
1
0
1
0
1
1
1
N/A
N/A
N/A
N/A
1.
Shown to indicate when Auto Page Rewrite Operation is executed.
2.
Shown to indicate when Read Modify Write Operation is executed.
Page Size = 528-bytes
Address Byte
Address Byte
Address Byte
Additional
Dummy
Bytes
Opcode
Opcode
Symbol
Parameter
Min
Max
Units
t
VCSL
Minimum V
CC to Chip Select Low Time
105
µs
tPUW
Power-Up Device Delay Before Program or Erase Allowed
3
ms
V
POR
Power-On Reset (POR) Voltage
1.5
2.2
V



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