ACE24C256C

Two-wire serial EEPROM

VER 1.2

3

Block Diagram

Pin Descriptions

Serial Clock (SCL): The SCL input is used to positive-edge clock data in 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 Addresses (E2, E1, E0): The E2, E1, and E0 pins are device address inputs. Typically, the E2,

E1, and E0 pins are for hardware addressing and a total of 8 devices can be connected on a single bus

system. If these pins are left floating, the E2, E1, and E0 pins will be internally pulled down to GND.

Write Control (WCB): The Write Control input, when WCB is connected directly to V

operations to the memory are inhibited. When connected to GND, allows normal write operations. If the

pin is left floating, the WCB pin will be internally pulled down to GND.

Pin Capacitance

Symbol

Parameter

Max

Units

Test Condition

Input/Output Capacitance (SDA)

8

pF

Input Capacitance (E0,E1,E2,WCB,SCL)

6

pF