X24C45 Datasheet, PDF (2/12 Pages) Xicor Inc. – Serial AUTOSTORE™ NOVRAM

X24C45
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-
cates V_CC has fallen below the AUTOSTORE thresh-
old (V_ASTH). AS may be wire-ORed with multiple open
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
DIP/SOIC
CE 1
8
V_CC
SK 2
7 AS
X24C45
DI 3
6 RECALL
DO 4
5
V_SS
PIN NAMES
Symbol
CE
SK
DI
DO
RECALL
AS
V_CC
V_SS
Description
Chip Enable
Serial Clock
Serial Data In
Serial Data Out
Recall Input
AUTOSTORE Oput
+5V
Ground
2
FN8104.0
June 1, 2005