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FM25H20-G 데이터시트(PDF) 2 Page - Cypress Semiconductor

부품명 FM25H20-G
상세설명  2Mb Serial 3V F-RAM Memory
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제조업체  CYPRESS [Cypress Semiconductor]
홈페이지  http://www.cypress.com
Logo CYPRESS - Cypress Semiconductor

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FM25H20 - 2Mb SPI FRAM
Document Number: 001-85935 Rev. *A
Page 2 of 16
Instruction Decode
Clock Generator
Control Logic
Write Protect
Instruction Register
Address Register
Counter
32768 x 64
FRAM Array
18
Data I/O Register
8
Nonvolatile Status
Register
3
W
S
HOLD
C
Q
D
Figure 1. Block Diagram
Pin Descriptions
Pin Name
I/O
Description
/S
Input
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 C signal. A falling edge on /S must occur prior
to every op-code.
C
Input
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 40 MHz and may be interrupted at
any time.
/HOLD
Input
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 C or /S. All transitions on /HOLD must occur while C is low.
/W
Input
Write Protect:
This active low pin prevents write operations only to the Status
Register. A complete explanation of write protection is provided on pages 6 and 7.
D
Input
Serial Input: All data is input to the device on this pin. The pin is sampled on the
rising edge of C and is ignored at other times. It should always be driven to a valid
logic level to meet IDD specifications.
* D may be connected to Q for a single pin data interface.
Q
Output
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.
* Q may be connected to D for a single pin data interface.
VDD
Supply
Power Supply (2.7V to 3.6V)
VSS
Supply
Ground


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