AT34C02

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 AT34C02. 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).

WRITE PROTECT (WP): The AT34C02 has a Write Pro-

tect pin that provides hardware data protection. The Write

Protect pin allows normal read/write operations when con-

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

Y DEC

DATA WORD

ADDR/COUNTER

SERIAL

CONTROL

LOGIC

START

STOP

LOGIC

DEVICE

ADDRESS

COMPARATOR

SERIAL MUX

EN

COMP

INC

LOAD

LOAD

R/W

H.V. PUMP/TIMING

DATA RECOVERY

WP

WRITE PROTECT

CIRCUITRY

SOFTWARE WRITE

PROTECTED AREA

(00H - 7FH)