X25401PI datasheet(2/14 Pages) XICOR

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X25401

PIN CONFIGURATION

PIN DESCRIPTIONS

Chip Select (

CS)

The Chip Select input must be LOW to enable all read/

write operations.

CS must remain LOW following a

Read or Write command until the data transfer is com-

plete.

CS HIGH places the X25401 in the low power

standby mode and resets the instruction register. There-

fore,

CS must be brought HIGH after the completion of

an operation in order to reset the instruction register in

preparation for the next command.

Serial Clock (SCK)

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

out of the device.

Serial Data In (SI)

SI is the serial data input.

Serial Data Out (SO)

SO 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 VCC has fallen below the AUTOSTORE thresh-

old (VASTH). 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 E2PROM to the RAM array.

PIN NAMES

Symbol

Description

Chip Enable

SCK

Serial Clock

Serial Data In

Serial Data Out

RECALL

Recall Input

AUTOSTORE Output

VCC

+5V

VSS

Ground

2051 PGM T01

SCK

VCC

RECALL

VSS

X25401

2051 FHD F02

DIP/SOIC

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