24LC08B datasheet(7/49 Pages) MICROCHIP

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 2002-2021 Microchip Technology Inc.

DS20001710N-page 7

24AA08/24LC08B/24FC08

2.0

PIN DESCRIPTIONS

The descriptions of the pins are listed in Table 2-1.

2.1

A0, A1, A2

The A0, A1 and A2 pins are not used by the 24XX08.

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

2.2

Serial Address/Data Input/Output

(SDA)

The SDA input 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 kΩ for 100 kHz,

2kΩ for 400 kHz and 1 MHz).

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.

2.3

Serial Clock (SCL)

The SCL input is used to synchronize the data transfer

to and from the device.

2.4

Write-Protect (WP)

This pin must be connected to either VSS or VCC.

If tied to VSS, normal memory operation is enabled

(read/write the entire memory 000-3FF).

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

memory will be write-protected. Read operations are

not affected.

TABLE 2-1:

PIN FUNCTION TABLE

Name DFN(1) MSOP PDIP

SOIC TDFN(1) TSSOP UDFN(1) SOT-23

Description

—

Not Connected

—

Not Connected

—

Not Connected

VSS

Ground

SDA

Serial Address/Data I/O

SCL

Serial Clock

Write-Protect Input

VCC

Power Supply

Note 1: The exposed pad on the DFN/TDFN/UDFN package can be connected to VSS or left floating.

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