2

5242B–SEEPR–01/09

AT34C02C

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 are hardwired (directly to GND or to Vcc) for compatibility with other AT24Cxx devices.

When the pins are hardwired, as many as eight 2K devices may be addressed on a single bus

system. (Device addressing is discussed in detail under “Device Addressing,” page 9.) A device

is selected when a corresponding hardware and software match is true. If these pins are left

floating, the A2, A1, and A0 pins will be internally pulled down to GND. However, due to capaci-

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

LOGIC

SDA

GND

SCL

VCC

Y DEC

DATA WORD

ADDR/COUNTER

SERIAL

CONTROL

LOGIC

START

STOP

LOGIC

DEVICE

ADDRESS

COMPARATOR

SERIAL MUX

EEPROM

EN

COMP

INC

LOAD

LOAD

R/W

H.V. PUMP/TIMING

DATA RECOVERY

WP

WRITE PROTECT

CIRCUITRY

SOFTWARE WRITE

PROTECTED AREA

(00H - 7FH)