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參數(shù)資料
| 型號： | FM25256-S |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 256Kb FRAM Serial 5V Memory |
| 中文描述： | 的256Kb FRAM的串行5V的記憶 |
| 文件頁數(shù)： | 2/13頁 |
| 文件大?。?/td> | 120K |
| 代理商： | FM25256-S |
FM25256
Rev. 2.0
Apr. 2005
Page 2 of 13
Instruction Decode
Clock Generator
Control Logic
Write Protect
Instruction Register
Address Register
Counter
8192 x 32
FRAM Array
15
Data I/O Register
8
Nonvolatile Status
Register
3
WP
CS
HOLD
SCK
SO
SI
Figure 1. Block Diagram
Pin Descriptions
Pin Name
/CS
I/O
Input
Description
Chip Select: This active low input activates the device. When high, the device enters
low-power standby mode, ignores other inputs, and all outputs are tri-stated. When
low, the device internally activates the SCK signal. A falling edge on /CS must occur
prior to every op-code.
Serial Clock: All I/O activity is synchronized to the serial clock. Inputs are latched on
the rising edge and outputs occur on the falling edge. Since the device is static, the
clock frequency may be any value between 0 and 25 MHz and may be interrupted at
any time.
Hold: The /HOLD pin is used when the host CPU must interrupt a memory operation
for another task. When /HOLD is low, the current operation is suspended. The device
ignores any transition on SCK or /CS. All transitions on /HOLD must occur while
SCK is low.
Write Protect: This active low pin prevents write operations to the status register only.
A complete explanation of write protection is provided on pages 6 and 7.
Serial Input: All data is input to the device on this pin. The pin is sampled on the
rising edge of SCK and is ignored at other times. It should always be driven to a valid
logic level to meet I
DD
specifications.
* SI may be connected to SO for a single pin data interface.
Serial Output: This is the data output pin. It is driven during a read and remains tri-
stated at all other times including when /HOLD is low. Data transitions are driven on
the falling edge of the serial clock.
* SO may be connected to SI for a single pin data interface.
Power Supply (4.0V to 5.5V)
Ground
SCK
Input
/HOLD
Input
/WP
Input
SI
Input
SO
Output
VDD
VSS
Supply
Supply
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| FM25256-STR | 功能描述:F-RAM 256K (32Kx8) 5V RoHS:否 存儲容量:512 Kbit 組織:64 K x 8 接口:SPI 工作電源電壓:2 V to 3.6 V 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube 制造商:Cypress Semiconductor |
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