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FM18W08 データシート(PDF) 2 Page - Ramtron International Corporation

部品番号 FM18W08
部品情報  256Kb Wide Voltage Bytewide F-RAM
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メーカー  RAMTRON [Ramtron International Corporation]
ホームページ  http://www.ramtron.com
Logo RAMTRON - Ramtron International Corporation

FM18W08 データシート(HTML) 2 Page - Ramtron International Corporation

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FM18W08
Rev. 2.0
Dec. 2011
Page 2 of 11
Address
Latch &
Decoder
A(14:0)
CE
Control
Logic
WE
A(14:0)
I/O Latch
Bus Driver
OE
32,768 x 8 FRAM Array
DQ(7:0)
Figure 1. Block Diagram
Pin Description
Pin Name
Type
Description
A(14:0)
Input
Address: The 15 address lines select one of 32,768 bytes in the F-RAM array. The
address value is latched on the falling edge of /CE.
DQ(7:0)
I/O
Data: 8-bit bi-directional data bus for accessing the F-RAM array.
/CE
Input
Chip Enable: /CE selects the device when low. Asserting /CE low causes the
address to be latched internally. Address changes that occur after /CE goes low
will be ignored until the next falling edge occurs.
/OE
Input
Output Enable: Asserting /OE low causes the FM18W08 to drive the data bus
when valid data is available. Deasserting /OE high causes the DQ pins to be tri-
stated.
/WE
Input
Write Enable: Asserting /WE low causes the FM18W08 to write the contents of
the data bus to the address location latched by the falling edge of /CE.
VDD
Supply
Supply Voltage
VSS
Supply
Ground
Functional Truth Table
/CE
/WE
Function
H
X
Standby/Precharge
X
Latch Address (and Begin Write if /WE=low)
L
H
Read
L
Write
Note: The /OE pin controls only the DQ output buffers.


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