4

Atmel AT24CS04/08 [PRELIMINARY DATASHEET]

8766B–SEEPR–8/12

5.

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.

4-Kbit devices to be addressed on a single bus system. Pin 1 is a no connect and can be connected to ground.

single bus system. Pins 1 and 2 are no connects and can be connected to ground. Refer to Section 8. “Device

Addressing” on page 10 for details about the pin state and the required protocol for communication .

The device address pins are not available on the SOT23 package offering. Refer to Section 8. “Device Addressing” on

page 10 for details on the protocol requirements with this package.

Write Protect (WP): AT24CS04/08 has a Write Protect (WP) pin that provides hardware data protection. When the Write

Protect pin is connected to ground (GND), normal read/write operations to the full array are possible. When the Write

This operation is summarized in Table 5-1 below.

Table 5-1.

Write Protect

WP Pin

Status

Part of the Array Protected

Atmel AT24CS04/08

Full Array

At GND

Normal Read/Write Operations