24LC02B datasheet(11/24 Pages) MICROCHIP

11 / 24 page

 2003 Microchip Technology Inc.

DS21709C-page 11

24AA02/24LC02B

8.0

PIN DESCRIPTIONS

The descriptions of the pins are listed in Table 8-1.

TABLE 8-1:

PIN FUNCTION TABLE

8.1

Serial Address/Data Input/Output

(SDA)

SDA is a bidirectional pin used to transfer addresses

and data into and out of the device. Since it is an open-

drain terminal, the SDA bus requires a pull-up resistor

to VCC (typical 10 k

Ω for 100 kHz, 2 kΩ for 400 kHz).

For normal data transfer, SDA is allowed to change

only during SCL low. Changes during SCL high are

reserved for indicating Start and Stop conditions.

8.2

Serial Clock (SCL)

The SCL input is used to synchronize the data transfer

to and from the device.

8.3

Write-Protect (WP)

The WP pin must be connected to either VSS or VCC.

If tied to VSS, normal memory operation is enabled

(read/write the entire memory

00-FF).

If tied to VCC, write operations are inhibited. The entire

memory will be write-protected. Read operations are

not affected.

This feature allows the user to use the 24XX02 as a

serial ROM when WP is enabled (tied to VCC).

8.4

A0, A1, A2

These A0, A1 and A2 pins are not used by the 24XX02.

They may be left floating or tied to either VSS or VCC.

Name

PDIP

SOIC

TSSOP

MSOP

SOT23

Description

—

Not Connected

—

Not Connected

—

Not Connected

VSS

442

Ground

SDA

Serial Address/Data I/O

SCL

Serial Clock

Write-Protect Input

VCC

+1.8V to 5.5V Power Supply

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