24C01CSN datasheet(5/36 Pages) MICROCHIP

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DS21201K-page 5

24C01C

2.0

PIN DESCRIPTIONS

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

TABLE 2-1:

PIN FUNCTION TABLE

2.1

SDA Serial Data

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 100 kHz, 2 k 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 conditions.

2.2

SCL Serial Clock

This input is used to synchronize the data transfer from

and to the device.

2.3

A0, A1, A2

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 24C01C devices may be connected to the

same bus by using different Chip Select bit combina-

tions. These inputs must be connected to either VCC or

VSS.

For the SOT-23 devices up to four devices may be con-

nected to the same bus using different Chip Select bit

combinations.

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.

2.4

Test

This pin is utilized for testing purposes only. It may be

tied high, tied low or left floating.

2.5

Noise Protection

The 24C01C employs a VCC threshold detector circuit

which disables the internal erase/write logic if the VCC

is below 3.8 volts at nominal conditions.

The SCL and SDA inputs have Schmitt Trigger and

filter circuits which suppress noise spikes to assure

proper device operation even on a noisy bus.

Name

8-pin

PDIP

8-pin

SOIC

8-pin

TSSOP

8-pin

MSOP

8-pin

DFN/TDFN

SOT-23

Function

Chip Select

—

Chip Select

VSS

444

Ground

SDA

Serial Data

SCL

Serial Clock

Test

777

—

Test

VCC

+4.5V to 5.5V Power Supply

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