AT24C164 Datasheet, PDF (2/11 Pages) ATMEL Corporation – 2-Wire Serial EEPROM

Absolute Maximum Ratings*
Operating Temperature .................................. -55°C to +125°C
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
Block Diagram
WP
*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.
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 SELECT (A2, A1, A0): The A2, A1 and A0 pins
are device address inputs that may be hardwired or actively
driven to V_DD or V_SS. These inputs allow the selection for
one of eight possible devices sharing a common bus. The
AT24C164 can be made compatible with the AT24C16 by
tying A2, A1 and A0 to V_SS. Device addressing is discussed
in detail in the device addressing section.
WRITE PROTECT (WP): The write protect input, when tied
low to GND, allows normal write operations.
Memory Organization
The AT24C164 is internally organized with 256 pages of
8 bytes each. Random word addressing requires an 11 bit
data word address.
2
AT24C164