2

FN8104.0

June 1, 2005

PIN DESCRIPTIONS

Chip Enable (CE)

The Chip Enable input must be HIGH to enable all

read/write operations. CE must remain HIGH following

a Read or Write command until the data transfer is

complete. CE LOW places the X24C45 in the low

power standby mode and resets the instruction register.

Therefore, CE must be brought LOW after the comple-

tion of an operation in order to reset the instruction reg-

ister in preparation for the next command.

Serial Clock (SK)

The Serial Clock input is used to clock all data into and

out of the device.

Data In (DI)

Data In is the serial data input.

Data Out (DO)

Data Out is the serial data output. It is in the high

impedance state except during data output cycles in

response to a READ instruction.

AUTOSTORE Output (AS)

AS is an open drain output which, when asserted indi-

drain outputs and used as an interrupt input to a micro-

controller or as an input to a low power reset circuit.

RECALL

RECALL LOW will initiate an internal transfer of data

from EEPROM to the RAM array.

PIN CONFIGURATION

PIN NAMES

Symbol

Description

CE

Chip Enable

SK

Serial Clock

DI

Serial Data In

DO

Serial Data Out

RECALL

Recall Input

AS

AUTOSTORE Oput

+5V

Ground

CE

SK

DI

DO

1

2

3

4

8

7

6

5

AS

RECALL

X24C45

DIP/SOIC

X24C45