24AA164TP datasheet(8/12 Pages) MICROCHIP

8 / 12 page

24AA164

DS21100F-page 8

8.0

PIN DESCRIPTIONS

8.1

SDA Serial Address/Data Input/Output

This is a Bi-directional 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 pullup

resistor to VCC (typical 10K

Ω for 100 kHz, 2 KΩ 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 condi-

tions.

8.2

SCL Serial Clock

This input is used to synchronize the data transfer from

and to the device.

8.3

This pin must be connected to either VSS or VCC.

If tied to VSS, normal memory operation is enabled

(read/write the entire memory 000-7FF).

If tied to VCC, WRITE operations are inhibited. The

entire memory will be write-protected. Read opera-

tions are not affected.

This feature allows the user to use the 24AA164 as a

serial ROM when WP is enabled (tied to VCC).

8.4

A0, A1, A2

These pins are used to conﬁgure the proper chip

address in multiple-chip applications (more than one

24AA164 on the same bus). The levels on these pins

are compared to the corresponding bits in the slave

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

Up to eight 24AA164s may be connected to the same

bus. These pins must be connected to either VSS or

VCC.

Note:

The level on A1 is compared to the inverse

of the slave address.

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