X84256 Xicor, X84256 Datasheet

X84256

Manufacturer Part Number

X84256

Description

Manufacturer

Xicor

Datasheet

1.X84256.pdf (15 pages)

Specifications of X84256

Case

SOP8

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Price

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BOSTOCK HK LIMITED

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X84256

Manufacturer:

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X84256BI-2.5T

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Meier Automation Equipment Co., Limited

Part Number:

X84256S8I-2.5

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BLOCK DIAGRAM

256K

FEATURES

• Up to 10MHz data transfer rate

• 25ns Read Access Time

• Direct Interface to Microprocessors and

• Low Power CMOS

• Byte or Page Write Capable

• Typical Nonvolatile Write Cycle Time: 2ms

• High Reliability

• Small Packages Options

4005 1 8/24/99 WW

Preliminary

Xicor, Inc. 1998 Patents Pending

Microcontrollers

—Eliminates I/O port requirements

—No interface glue logic required

—Eliminates need for parallel to serial converters

—2.5V–5.5V and 5V ±10% Versions

—Standby Current Less than 1µA

—Active Current Less than 3mA

—64-Byte Page Write Mode

—1,000,000 Endurance Cycles

—Guaranteed Data Retention: 100 Years

—8, 16-Lead SOIC Packages

—14-Lead TSSOP Packages

—8-Lead XBGA Packages

Ports

Saved

System Connection

P0/CS

P1/CLK

P2/DI

P3/DO

RISC

ASIC

DSP

µP

µC

A15

µPort Saver EEPROM

X84256

DESCRIPTION

The µPort Saver memories need no serial ports or spe-

cial hardware and connect to the processor memory bus.

Replacing bytewide data memory, the µPort Saver uses

bytewide memory control functions, takes a fraction of

the board space and consumes much less power.

Replacing serial memories, the µPort Saver provides all

the serial beneﬁts, such as low cost, low power, low volt-

age, and small package size while releasing I/Os for

more important uses.

The µPort Saver memory outputs data within 25ns of an

active read signal. This is less than the read access time

of most hosts and provides “no-wait-state” operation.

This prevents bottlenecks on the bus. With rates to 10

MHz, the µPort Saver supplies data faster than required

by most host read cycle speciﬁcations. This eliminates

the need for software NOPs.

The µPort Saver memories communicate over one line

of the data bus using a sequence of standard bus read

and write operations. This “bit serial” interface allows the

µPort Saver to work well in 8-bit, 16 bit, 32-bit, and 64-bit

systems.

A Write Protect (WP) pin prevents inadvertent writes to

the memory.

Xicor EEPROMs are designed and tested for applica-

tions requiring extended endurance. Inherent data reten-

tion is greater than 100 years.

I/O

COMMAND

CONTROL

DECODE

LOGIC

AND

Internal Block Diagram

DEC

Characteristics subject to change without notice

MPS

MPS EEPROM

TIMING & CONTROL

H.V. GENERATION

DATA REGISTER

Y DECODE

EEPROM

ARRAY

32K x 8

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