X24C04-2.7 Ver la hoja de datos (PDF) - Xicor -> Intersil

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X24C04-2.7

Serial EEPROM

Xicor -> Intersil 

X24C04

PIN DESCRIPTIONS

Serial Clock (SCL)

The SCL input is used to clock all data into and out of

the device.

Serial Data (SDA)

SDA is a bidirectional pin used to transfer data into and

out of the device. It is an open drain output and may be

wire-ORed with any number of open drain or open col-

lector outputs.

An open drain output requires the use of a pull-up

resistor. For selecting typical values, refer to the Pull-Up

Resistor selection graph at the end of this data sheet.

Address (A0, A1, A2)

A0 is a no connect. The Address inputs (A1, A2) are

used to set the appropriate bits of the seven bit slave

address. These inputs can be used static or actively

driven. If used statically they must be tied to VSS or

VCC as appropriate. If driven they must be driven to

VSS or to VCC.

PIN NAMES

Symbol

A0–A2

SDA

SCL

TEST

VSS

VCC

Description

Address Inputs

Serial Data

Serial Clock

Test Input (Hold at VSS)

Ground

Supply Voltage

PIN CONFIGURATION

SOIC

A0

1

8

A1

2

7

X24C04

A2

3

6

VSS

4

5

VCC

TEST

SCL

SDA

DEVICE OPERATION

The X24C04 supports a bidirectional bus oriented pro-

tocol. The protocol defines any device that sends data

onto the bus as a transmitter, and the receiving device

as the receiver. The device controlling the transfer is a

master and the device being controlled is the slave.

The master will always initiate data transfers, and pro-

vide the clock for both transmit and receive operations.

Therefore, the X24C04 will be considered a slave in all

applications.

Clock and Data Conventions

Data states on the SDA line can change only during

SCL LOW. SDA state changes during SCL HIGH are

reserved for indicating start and stop conditions. Refer

to Figures 1 and 2.

Start Condition

All commands are preceded by the start condition,

which is a HIGH to LOW transition of SDA when SCL is

HIGH. The X24C04 continuously monitors the SDA and

SCL lines for the start condition and will not respond to

any command until this condition has been met.

REV 1.1.3 11/28/00

www.xicor.com

Characteristics subject to change without notice. 2 of 13

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