© 1996 Microchip Technology Inc.

DS21081D-page 7

24C08B/16B

FIGURE 7-1:

CURRENT ADDRESS READ

FIGURE 7-2:

RANDOM READ

FIGURE 7-3:

SEQUENTIAL READ

SP

BUS ACTIVITY

MASTER

SDA LINE

BUS ACTIVITY

S

T

A

R

T

S

T

O

P

CONTROL

BYTE

DATA n

A

C

K

N

O

A

C

K

S

P

S

BUS ACTIVITY

MASTER

SDA LINE

BUS ACTIVITY

S

T

A

R

T

S

T

O

P

CONTROL

BYTE

A

C

K

WORD

ADDRESS (n)

CONTROL

BYTE

S

T

A

R

T

DATA (n)

A

C

K

A

C

K

N

O

A

C

K

P

BUS ACTIVITY

MASTER

SDA LINE

BUS ACTIVITY

S

T

O

P

CONTROL

BYTE

A

C

K

N

O

A

C

K

DATA n

DATA n + 1

DATA n + 2

DATA n + X

A

C

K

A

C

K

A

C

K

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 pull-up

Ω).

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

WP

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

entire memory will be write-protected. Read operations

are not affected.

This feature allows the user to use the 24C08B/16B as

8.4

A0, A1, A2

These pins are not used by the 24C08B/16B. They