24LC64XT-ESLASHMS datasheet(12/24 Pages) MICROCHIP

12 / 24 page

24AA64/24LC64

DS21189F-page 12

 2002 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, A2 inputs are used by the 24XX64 for mul-

tiple 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 V

CC or VSS.

7.2

Serial Data (SDA)

This is a bi-directional pin used to transfer addresses

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

drain terminal, therefore, the SDA bus requires a pull-

up resistor to V

CC (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 condi-

tions.

7.3

Serial Clock (SCL)

This input is used to synchronize the data transfer from

and to the device.

7.4

Write Protect (WP)

This pin can be connected to either V

SS, 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 V

SS or left floating, normal memory operation

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

If tied to V

CC, WRITE operations are inhibited. Read

operations are not affected.

Name

PDIP

SOIC

TSSOP

MSOP

ROTATED

TSSOP

Description

Chip Address Input

Ground

SDA

Serial Address/Data I/O

SCL

Serial Clock

Write Protect Input

+1.8V to 5.5V Power Supply

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