X24C45

FN8104 Rev 0.00

Page 2 of 12

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 com-

plete. CE LOW places the X24C45 in the low power

standby mode and resets the instruction register. There-

fore, CE must be brought LOW after the completion of an

operation in order to reset the instruction register 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 imped-

ance 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-

cates VCC has fallen below the AUTOSTORE threshold

(VASTH). AS may be wire-ORed with multiple open drain

outputs and used as an interrupt input to a microcontrol-

ler 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

VCC

+5V

VSS

Ground

CE

SK

DI

DO

1

2

3

4

8

7

6

5

VCC

AS

RECALL

VSS

X24C45

DIP/SOIC