AT24C32/64

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

or left not connected for hardware compatibility with

AT24C16. When the pins are hardwired, as many as eight

32K/64K devices may be addressed on a single bus sys-

tem (device addressing is discussed in detail under the

Device Addressing section). When the pins are not hard-

wired, the default A

WRITE PROTECT (WP): The write protect input, when tied

to GND, allows normal write operations. When WP is tied

(8/16K bits) of memory are inhibited. If left unconnected,

WP is internally pulled down to GND.

Memory Organization

AT24C32/64, 32K/64K SERIAL EEPROM: The 32K/64K is

internally organized as 256 pages of 32 bytes each. Ran-

dom word addressing requires a 12/13 bit data word

address.

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