24CS512 datasheet(8/66 Pages) MICROCHIP

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24CS512

DS20005769C-page 8

 2018-2021 Microchip Technology Inc.

2.0

PIN DESCRIPTIONS

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

2.1

Device Address Inputs (A0, A1

and A2)

The A0, A1 and A2 inputs are used by the 24CS512 for

multiple device operations. The logic levels on these

inputs are compared with the corresponding bits in the

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

Up to eight devices may be connected to the same bus

by using different hardware client address bit combina-

tions. These inputs must be connected to either VCC or

VSS.

In most applications, the device 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 logic device,

the device address pins must be driven to a logic ‘0’ or

a 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 (typically 10 kΩ for 100 kHz, 2 kΩ for

400 kHz and 1 MHz and 330Ω for 3.4 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 from

and to the device.

2.4

Write-Protect (WP)

This pin must be connected to either VSS or VCC. If tied

to VSS, write operations to the memory array and

Security register are enabled. If tied to VCC, write

operations to the memory array and Security register are

inhibited, but read operations are not affected.

TABLE 2-1:

PIN FUNCTION TABLE

Name

8-Lead

MSOP

8-Lead

PDIP

8-Lead

SOIC

8-Lead

SOIJ

8-Lead

TSSOP

5-Lead

SOT-23

8-Lead

UDFN(1)

8-Ball

CSP

Function

—

Device Address Input

—

Device Address Input

—

Device Address Input

VSS

424

Ground

SDA

Serial Data

SCL

Serial Clock

757

Write-Protect

VCC

848

Device Power Supply

Note 1: The exposed pad on this package can be connected to VSS or left floating.

Note:

This pin is ignored when using Enhanced

Software Write Protection mode and

should be tied to either VCC or VSS.

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