AT24C08B-TH-B データシートの表示（PDF） - Atmel Corporation

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AT24C08B-TH-B

Two-wire Serial EEPROM

Atmel Corporation 

AT24C04B/08B

1. 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.

DEVICE/PAGE ADDRESSES (A2, A1, A0):

The AT24C04B uses the A2 and A1 inputs for hard wire addressing and a toal of four 4K devices

may be addressed on a single bus system. The A0 pin is a no connect and can be connected to

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

The AT24C08B only uses the A2 input for hardware addressing and a total of two 8K devices

may be addressed on a single bus system. The A0 and A1 pins are no connects and can be

connected to ground (device addressing is discussed in detail under the Device Addressing

section).

Table 1-1.

WP Pin

Status

At VCC

At GND

Write Protect

Part of the Array Protected

24C04B/08B

Full Array

Normal Read/Write Operations

3

5226D–SEEPR–7/08

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