24LC64 datasheet(12/26 Pages) MICROCHIP

12 / 26 page

24AA64/24LC64

DS21189H-page 12

 2003 Microchip Technology Inc.

7.0

PIN DESCRIPTIONS

The descriptions of the pins are listed in Table 7-1.

TABLE 7-1:

PIN FUNCTION TABLE

7.1

A0, A1, A2 Chip Address Inputs

The A0, A1 and A2 inputs are used by the 24XX64 for

multiple device operation. The levels on these inputs

are compared with the corresponding bits in the slave

address. The chip is selected if the compare is true.

Up to eight devices may be connected to the same bus

by using different Chip Select bit combinations. These

inputs must be connected to either VCC or VSS.

7.2

Serial Data (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 the Start and Stop conditions.

7.3

Serial Clock (SCL)

The SCL input is used to synchronize the data transfer

from and to the device.

7.4

Write-Protect (WP)

WP can be connected to either VSS, VCC or left floating.

An internal pull-down resistor on this pin will keep the

device in the unprotected state if left floating. If tied to

VSS, or left floating, normal memory operation is

enabled (read/write the entire memory 0000-1FFF).

If tied to VCC, write operations are inhibited. Read

operations are not affected.

Name

PDIP

SOIC

TSSOP

MSOP

ROTATED

TSSOP

Description

Chip Address Input

VSS

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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