2

AT24C02A/04A

5083C–SEEPR–1/07

Figure 1. 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 must be hardwired for the AT24C02A. As many as eight 2K devices

may be addressed on a single bus system. (Device addressing is discussed in detail

under Device Addressing, page 7).

The AT24C04A uses the A2 and A1 inputs for hardwire addressing, and a total of four

4K devices may be addressed on a single bus system. The A0 pin is a no-connect.

Absolute Maximum Ratings*

Operating Temperature

......................................−40°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

START

STOP

LOGIC