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FM21L16 データシート(PDF) 2 Page - Ramtron International Corporation

部品番号 FM21L16
部品情報  2Mbit FRAM Memory
Download  14 Pages
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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

FM21L16 データシート(HTML) 2 Page - Ramtron International Corporation

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FM21L16 - 128Kx16 FRAM
Rev. 1.0
Sept. 2007
Page 2 of 14
CE
Control
Logic
WE
A(16:2)
A(1:0)
I/O Latch & Bus Driver
OE
DQ(15:0)
16K x 16 block
16K x 16 block
16K x 16 block
16K x 16 block
16K x 16 block
16K x 16 block
16K x 16 block
16K x 16 block
A(16:0)
Column Decoder
UB, LB
2
ZZ
Figure 1. Block Diagram
Pin Description
Pin Name
Type
Pin Description
A(16:0)
Input
Address inputs: The 17 address lines select one of 131,072 words in the FRAM array.
The lowest two address lines A(1:0) may be used for page mode read and write
operations.
/CE
Input
Chip Enable input: The device is selected and a new memory access begins when /CE is
low and /ZZ is high. The entire address is latched internally on the falling edge of /CE.
Subsequent changes to the A(1:0) address inputs allow page mode operation when /CE
is low.
/WE
Input
Write Enable: A write cycle begins when /WE is asserted. The rising edge causes the
FM21L16 to write the data on the DQ bus to the FRAM array. The falling edge of /WE
latches a new column address for page mode write cycles.
/OE
Input
Output Enable: When /OE is low, the FM21L16 drives the data bus when valid read
data is available. Deasserting /OE high tri-states the DQ pins.
/ZZ
Input
Sleep: When /ZZ is low, the device enters a low power sleep mode for the lowest supply
current condition. Since this input is logically AND’d with /CE, /ZZ must be high for
normal read/write operation. If unused, tie /ZZ to VDD.
DQ(15:0)
I/O
Data: 16-bit bi-directional data bus for accessing the FRAM array.
/UB
Input
Upper Byte Select: Enables DQ(15:8) pins during reads and writes. These pins are hi-Z
if /UB is high.
/LB
Input
Lower Byte Select: Enables DQ(7:0) pins during reads and writes. These pins are hi-Z
if /LB is high.
VDD
Supply
Supply Voltage: 3.3V
VSS
Supply
Ground


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