24LC1025-ESLASHP datasheet(5/26 Pages) MICROCHIP

5 / 26 page

 2010 Microchip Technology Inc.

DS21941G-page 5

24AA1025/24LC1025/24FC1025

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 Chip Address Inputs

The A0 and A1 inputs are used by the 24XX1025 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 comparison is true.

Up to four devices may be connected to the same bus

by using different Chip Select bit combinations. In most

applications, the chip address inputs A0 and A1 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

A2 Chip Address Input

The A2 input is non-configurable Chip Select. This pin

must be tied to VCC in order for this device to operate.

2.3

Serial Data (SDA)

This is a bidirectional 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 VCC (typical 10 k

 for 100kHz, 2k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.

2.4

Serial Clock (SCL)

This input is used to synchronize the data transfer from

and to the device.

2.5

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 PDIP SOIJ SOIC

Function

User Configurable Chip

Select

User Configurable Chip

Select

Non-Configurable Chip

Select.

This pin must be hard-

wired to logical 1 state

(VCC). Device will not

operate with this pin left

floating or held to logical

0 (VSS).

VSS

Ground

SDA

Serial Data

SCL

Serial Clock

Write-Protect Input

VCC

+1.7 to 5.5V (24AA1025)

+2.5 to 5.5V (24LC1025)

+1.8 to 5.5V (24FC1025)

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