FM18L08-70-S Ramtron, FM18L08-70-S Datasheet - Page 2

• Manufacturer Part Number: FM18L08-70-S
• Description: F-RAM 256K (32Kx8) 70ns 3V
• Manufacturer: Ramtron

Specifications of FM18L08-70-S

• Memory Size: 256 KB
• Organization: 32 K x 8
• Interface: Parallel
• Access Time: 70 ns
• Operating Supply Voltage: 3 V to 3.6 V
• Operating Temperature Range: - 40 C to + 85 C
• Package / Case: SOIC-28
• Mounting Style: SMD/SMT
• Lead Free Status / Rohs Status: No

Pin Description
Functional Truth Table
Note: The /OE pin controls only the DQ output buffers.
Rev. 3.5
Sept. 2009
Pin Name
A0-A14
DQ0-7
/CE
/OE
/WE
VDD
VSS
/CE
H
L
L
WE
OE
CE
A0-A14
Supply
Supply
Type
Input
Input
Input
Input
I/O
/WE
X
X
H
Address
Pin Description
Address: The 15 address lines select one of 32,768 bytes in the FRAM array. The
address value is latched on the falling edge of /CE.
Data: 8-bit bi-directional data bus for accessing the FRAM array.
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.
Output Enable: Asserting /OE low causes the FM18L08 to drive the data bus when
valid data is available. Deasserting /OE high causes the DQ pins to be tri-stated.
Write Enable: Asserting /WE low causes the FM18L08 to write the contents of the
data bus to the address location latched by the falling edge of /CE.
Supply Voltage
Ground
Latch
Control
Logic
Function
Standby/Precharge
Latch Address (and Begin Write if /WE=low)
Read
Write
A10-A14
A0-A7
A8-A9
Figure 1. Block Diagram
Decoder
Row
32,768 x 8 FRAM Array
Column Decoder
Block Decoder
Bus Driver
I/O Latch
DQ0-7
FM18L08
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