元器件交易网

AT24C164

Pin Description

SERIAL CLOCK (SCL): The SCL input is used to positive edge clock data into eachEEPROM device and negative edge clock data out of each device.

SERIAL DATA (SDA): The SDA pin is bidirectional for serial data transfer. This pin isopen-drain driven and may be wire-ORed with any number of other open-drain or opencollector devices.

DEVICE SELECT (A2, A1, A0): The A2, A1 and A0 pins are device address inputs thatmay be hardwired or actively driven to VDD or VSS. These inputs allow the selection forone of eight possible devices sharing a common bus. The AT24C164 can be madecompatible with the AT24C16 by tying A2, A1 and A0 to VSS. 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 normalwrite operations. When WP is tied to VCC, all write operations are inhibited.

Memory Organization

The AT24C164 is internally organized with 256 pages of 8 bytes each. Random wordaddressing requires an 11 bit data word address.

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