X25021P datasheet, PDF - EEWORLD Datasheet

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X25021P: DescriptionSPI Serial E2PROM with Block LockTM Protection; File Size58KB，14 Pages; ManufacturerXicon Passive Components; Websitehttp://www.xicor.com

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X25021P Overview

SPI Serial E2PROM with Block LockTM Protection

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X25021

SPI Serial E

PROM with Block Lock

Protection

DESCRIPTION

256 x 8 Bit

FEATURES

•

1MHz Clock Rate

SPI Modes (0,1 & 1,0)

256 X 8 Bits

—4 Byte Page Mode

Low Power CMOS

—10

A Standby Current

—3mA Active Current

2.7V To 5.5V Power Supply

Block Lock Protection

—Protect 1/4, 1/2 or all of E

PROM Array

Built-in Inadvertent Write Protection

—Power-Up/Power-Down protection circuitry

—Write Latch

—Write Protect Pin

Self-Timed Write Cycle

—5ms Write Cycle Time (Typical)

High Reliability

—Endurance: 100,000 cycles per byte

—Data Retention: 100 Years

—ESD protection: 2000V on all pins

8-Lead PDlP Package

8-Lead SOIC Package

The X25021 is a CMOS 2048-bit serial E

PROM, inter-

nally organized as 256 x 8. The X25021 features a Serial

Peripheral Interface (SPI) and software protocol allow-

ing operation on a simple three-wire bus. The bus

signals are a clock input (SCK) plus separate data in (SI)

and data out (SO) lines. Access to the device is con-

trolled through a chip select (CS) input, allowing any

number of devices to share the same bus.

The X25021 also features two additional inputs that

provide the end user with added flexibility. By asserting

the

HOLD

input, the X25021 will ignore transitions on its

inputs, thus allowing the host to service higher priority

interrupts. The

input can be used as a hardwire input

to the X25021 disabling all write attempts, thus providing

a mechanism for limiting end user capability of altering

the memory.

The X25021 utilizes Xicor’s proprietary Direct Write™

cell, providing a minimum endurance of 100,000 cycles

per byte and a minimum data retention of 100 years.

FUNCTIONAL DIAGRAM

STATUS

WRITE

PROTECT

LOGIC

X DECODE

LOGIC

256 BYTE

ARRAY

16 X 32

SCK

HOLD

COMMAND

DECODE

AND

CONTROL

LOGIC

16 X 32

32 X 32

WRITE

CONTROL

AND

TIMING

LOGIC

Y DECODE

DATA REGISTER

Direct Write™ and Block Lock™ Protection is a trademark of Xicor, Inc.

6615-1.5 6/10/96 T3/C1/D0 NS

6615 FHD F01

Characteristics subject to change without notice

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