3

AT24C32/64

0336K–SEEPR–7/03

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 system (device addressing is discussed in detail under the

are zero.

WRITE PROTECT (WP): The write protect input, when tied to GND, allows normal write

(8/16K bits) of memory are inhibited. If left unconnected, WP is internally pulled down to

GND.

pages of 32 bytes each. Random word addressing requires a 12/13 bit data word

address.