AT24C02A/04A/08A

2

Block Diagram

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 A2, A1

and A0 pins are device address inputs that are hard wired

for the AT24C02A. As many as eight 2K devices may be

addressed on a single bus system (device addressing is

discussed in detail under the Device Addressing section).

The AT24C04A uses the A2 and A1 inputs for hard wire

addressing and a total of four 4K devices may be

addressed on a single bus system. The A0 pin is a no con-

nect.

The AT24C08A only uses the A2 input for hardwire

addr es si ng a nd a total of two 8K de vi ces ma y be

addressed on a single bus system. The A0 and A1 pins are

no connects.

WRITE PROTECT (WP): The AT24C02A/04A/08A has a

Write Protect pin that provides hardware data protection.

The Write Protect pin allows normal read/write operations

when connected to ground (GND). When the Write Protect

Absolute Maximum Ratings*

Operating Temperature .................................. -55

°C to +125°C

*NOTICE:

Stresses beyond those listed under “Absolute

Maximum Ratings” may cause permanent dam-

age to the device. This is a stress rating only and

functional operation of the device at these or any

other conditions beyond those indicated in the

operational sections of this specification is not

implied. Exposure to absolute maximum rating

conditions for extended periods may affect device

reliability.

Storage Temperature ..................................... -65

°C to +150°C

Voltage on Any Pin

with Respect to Ground .....................................-1.0V to +7.0V

Maximum Operating Voltage........................................... 6.25V

DC Output Current........................................................ 5.0 mA