ACE24LA1024A

Two-wire Serial EEPROM

VER 1.3

3

Block Diagram

Pin Descriptions

Device/Page Addresses (A2, A1 and A0):

The A2, A1 and A0 pins are device address inputs that are hard wire for the ACE24LA1024A. Eight 256K

devices may be addressed on a single bus system (device addressing is discussed in detail under the

Device Addressing section).

Serial Data (SDA):

The SDA pin is bi-directional 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.

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.

Write Protect (WP):

The ACE24LA1024A has a Write Protect pin that provides hardware data protection.

The Write Protect pin allows normal read/write operations when connected to ground (GND). When the

Write Protection pin is connected to Vcc, the write protection feature is enabled and operates as shown in

the following Table 1.

Table1. Write Protect

WP Pin Status

ACE24LA1024A

Full (1024K) Array

At GND

Normal Read / Write Operations