R1EX24512ASAS0A Datasheet, PDF (8/23 Pages) Renesas Technology Corp – Two-wire serial interface 512k EEPROM (64-kword × 8-bit)

R1EX24512ASAS0A
Device Address (A0, A1)
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 A1, that one
device can be activated.
Pin Connections for A0 to A1
Pin connection
Max connect
Memory size number
A1
A0
512k bit
4
V_CC/V_SS
V_CC/V_SS
Note: 1. During floating, "V /V " are fixed to V .
CC SS
SS
Note
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.
Write Protect Area
WP pin status
V_IH
V
IL
Write protect area
512k bit
Full (512k bit)
Normal read/write operation
REJ03C0325-0100 Rev.1.00 May. 16, 2008
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