24LC515 datasheet(5/22 Pages) MICROCHIP

5 / 22 page

 2003 Microchip Technology Inc.

Preliminary

DS21673C-page 5

24AA515/24LC515/24FC515

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, A1 inputs are used by the 24XX515 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 four devices may be connected to the same bus

by using different Chip Select bit combinations. If left

unconnected, these inputs will be pulled down

internally to VSS.

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

Ω for 100 kHz, 2 kΩ for

400kHz and 1MHz).

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 can be connected to either VSS, VCC or left

floating. An internal pull-down resistor on this pin will

keep this 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 0000h-

FFFFh).

If tied to VCC, write operations are inhibited. Read

operations are not affected.

3.0

FUNCTIONAL DESCRIPTION

The 24XX515 supports a bidirectional 2-wire bus and

data transmission protocol. A device that sends data

onto the bus is defined as a transmitter, and a device

receiving data as a receiver. The bus must be

controlled by a master device which generates the

serial clock (SCL), controls the bus access, and

generates the Start and Stop conditions while the

24XX515 works as a slave. Both master and slave can

operate as a transmitter or receiver, but the master

device determines which mode is activated.

Name PDIP SOIC

Function

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

+1.8 to 5.5V (24AA515)

+2.5 to 5.5V (24LC515)

+4.5 to 5.5V (24FC515)

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