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R1EX24064AxxS0A
Device Address (A0, A1, A2)
Eight devices can be wired for one common data bus line as maximum. Device address pins are used to
distinguish each device and device address pins should be connected to V CC or V SS . When device address
code provided from SDA pin matches corresponding hard-wired device address pins A0 to A2, that one
device can be activated.
These pins are internally pulled-down to V SS . The device reads these pins as Low if unconnected.
Pin Connections for A0 to A2
Pin connection
Max connect
Memory size number
A2
A1
A0
Note
64k bit
8
V CC /V SS
V CC /V SS
V CC /V SS
Note:
1. During floating, “V CC /V SS ” are fixed to V SS .
Write Protect (WP)
When the Write Protect pin (WP) is high, the write protection feature is enabled and operates as shown in
the following table.
Also, acknowledgment "0" is outputted after inputting device address and memory address. After
inputting write data, acknowledgment "1"" (NO ACK) is outputted.
When the WP is low, write operation for all memory arrays are allowed. The read operation is always
activated irrespective of the WP pin status.
The WP pin is internally pulled-down to V SS . Write operations for all memory array are allowed if
unconnected.
Write Protect Area
Write protect area
WP pin status
V IH
V IL
64k bit
Full (64k bit)
Normal read/write operation
REJ03C0332-0200 Rev.2.00 Oct. 26, 2009
Page 8 of 22
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