AT24C04B ATMEL [ATMEL Corporation], AT24C04B Datasheet - Page 3

• Manufacturer Part Number: AT24C04B
• Description: Two-wire Serial EEPROM 4K (512 x 8) 8K (1024 x 8)
• Manufacturer: ATMEL [ATMEL Corporation]

1. Pin Description
5226D–SEEPR–7/08
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 1-1.
At V
At GND
WP Pin
Status
CC
Write Protect
Full Array
Normal Read/Write Operations
Part of the Array Protected
24C04B/08B
AT24C04B/08B
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