AT24C04B_14 Datasheet, PDF (3/28 Pages) ATMEL Corporation – 2-Wire Automotive Temperature Serial EEPROM

Two-wire Serial EEPROM
1. Pin Description
SERIAL CLOCK (SCL): The SCL input is used to positive edge clock data into each EEPROM device and negative
edge clock data out of each device.
SERIAL DATA (SDA): The SDA pin is bidirectional for serial data transfer. This pin is open drain driven and may be
wire-ORed with any number of other open-drain or open-collector devices.
DEVICE/PAGE ADDRESSES (A2, A1, A0): The AT24C04B uses the A2 and A1 inputs for hard wire addressing and a
toal of four 4K devices may be addressed on a single bus system. The A0 pin is a no connect and can be connected to
ground (device addressing is discussed in detail under the Device Addressing section).
The AT24C08B only uses the A2 input for hardware addressing and a total of two 8K devices may be addressed on a
single bus system. The A0 and A1 pins are no connects and can be connected to ground (device addressing is
discussed in detail under the Device Addressing section).
Table 1. Write Protect
WP Pin Status
Part of the Array Protected
24C04B/08B
At V_CC
Full Array
At GND
Normal Read/Write Operations
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5226G–SEEPR–11/09