R1EX24004ASAS0I Datasheet, PDF (8/24 Pages) Renesas Technology Corp – Two-wire serial interface 4k EEPROM (512-word × 8-bit)

R1EX24004AxxS0I
Device Address (A0, A1, A2)
Four 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.
Pin Connections for A0 to A2
Pin connection
Max connect
Memory size number
A2
A1
A0
4k bit
4
V_CC/V_SS*¹ V_CC/V_SS*¹ ×*²
Note: 1. During floating, “V_CC/V_SS” are fixed to V_SS.
2. Floating state can be possible.
Note
Use A0 for memory address a8
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
4k bit
Full (4k bit)
Normal read/write operation
REJ03C0356-0001 Rev.0.01 Jan. 11, 2008
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