Rainbow Electronics AT24C164 - Manual (Page 3)

3
AT24C164
0105F–SEEPR–08/02
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 dis-
cussed 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.