FM24W256 Ramtron, FM24W256 Datasheet - Page 2

• Manufacturer Part Number: FM24W256
• Description: 256Kb Wide Voltage Serial F-RAM
• Manufacturer: Ramtron

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Pin Description
Rev. 1.3
July 2011
Pin Name
A0-A2
SDA
SCL
WP
VDD
VSS
A0-A2
SCL
SDA
WP
Supply
Supply
Type
Input
Input
Input
I/O
Pin Description
Device Select Address 0-2: These pins are used to select one of up to 8 devices of
the same type on the same two-wire bus. To select the device, the address value on
the three pins must match the corresponding bits contained in the slave address. The
address pins are pulled down internally.
Serial Data/Address: This is a bi-directional pin for the two-wire interface. It is
open-drain and is intended to be wire-OR’d with other devices on the two-wire bus.
The input buffer incorporates a Schmitt trigger for noise immunity and the output
driver includes slope control for falling edges. A pull-up resistor is required.
Serial Clock: The serial clock pin for the two-wire interface. Data is clocked out of
the part on the falling edge, and into the device on the rising edge. The SCL input
also incorporates a Schmitt trigger input for noise immunity.
Write Protect: When tied to VDD, addresses in the entire memory map will be write-
protected. When WP is connected to ground, all addresses may be written. This pin
is pulled down internally.
Supply Voltage: 2.7V to 5.5V
Ground
Serial to Parallel
Counter
Control Logic
Converter
Figure 1. Block Diagram
Address
Latch
FM24W256 - 256Kb Wide Voltage I2C F-RAM
FRAM Array
Data Latch
4,096 x 64
8
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