24LC256T-ESLASHCS16K datasheet(7/42 Pages) MICROCHIP

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DS20001203W-page 7

24AA256/24LC256/24FC256

2.0

PIN DESCRIPTIONS

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

TABLE 2-1:

PIN FUNCTION TABLE

2.1

A0, A1, A2 Chip Address Inputs

The A0, A1 and A2 inputs are used by the 24XX256 for

multiple device operations. 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 (two for the MSOP package) may

be connected to the same bus by using different Chip

Select bit combinations. These inputs must be

connected to either VCC or VSS.

In most applications, the chip address inputs A0, A1

and A2 are hard-wired to logic ‘0’ or logic ‘1’. For

applications in which these pins are controlled by a

microcontroller or other programmable device, the chip

address pins must be driven to logic ‘0’ or logic ‘1’

before normal device operation can proceed.

2.2

Serial Data (SDA)

This is a bidirectional pin used to transfer addresses

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

terminal. Therefore, the SDA bus requires a pull-up

resistor to VCC (typical 10 k

 for 100 kHz, 2 k 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 the Start and Stop conditions.

2.3

Serial Clock (SCL)

This 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, write operations are enabled. If tied to VCC,

write operations are inhibited but read operations are

not affected.

Name

DFN(1)

MSOP

PDIP

SOIC

SOIJ

TDFN(1)

TSSOP

CSP

Function

—

User Configurable Chip Select

—

User Configurable Chip Select

VSS

Ground

SDA

Serial Address/Data I/O

SCL

Serial Clock

Write-Protect Input

VCC

Power Supply

Note 1: Exposed pad on DFN/TDFN can be connected to VSS or left floating.

Note:

For the MSOP package only, pins A0 and

A1 are not connected.

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