EC24C02A/04A/08A/16A

2K/4K/8K/16K-bit 2-WIRE SERIAL CMOS EEPROM

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5H06N-Rev.F004

Pin Descriptions

DEVICE/PAGE ADDRESSES (A2, A1 and A0): The A2, A1 and A0 pins are device address inputs that are

hard-wired for the EC24C02A. Eight 2K devices may be addressed on a single bus system (device

addressing is discussed in detail under the Device Addressing section).

The EC24C04A uses the A2 and A1 inputs for hard-wired addressing and a total of four 4K devices may be

addressed on a single bus system. The A0 (P0) pin is a no connection or can be connected to ground.

The EC24C08A only uses the A2 input for hard-wired addressing and a total of two 8K devices may be

addressed on a single bus system. The A0 (P0) and A1 (P1) pins are no connections or can be connected to

ground.

The EC24C16A does not use the device address pins, which limits the number of devices on a single bus to

one. The A0 (P0), A1 (P1), and A2 (P2) pins are no connections or can be connected to ground.

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 EC24C02A/04A/08A/16A has a Write Protect pin that provides hardware data

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

shown in the following.

Write Protect

WP Pin Status

Part of the Array Protected

EC24C02A

EC24C04A

EC24C08A

EC24C16A

Full (2K) Array

Full (4K) Array

Full (8K) Array

Full (16K) Array

At GND

Normal Read / Write Operations

Ordering Information