X25F128

1

SerialFlash™ and Block Lock™ Protection are trademarks of Xicor, Inc.

SerialFlash™ Memory With Block Lock™ Protection

FEATURES

• 1MHz Clock Rate

• SPI Serial Interface

• 16K X 8 Bits

— 32 Byte Small Sector Program Mode

• Low Power CMOS

—<1

— <5mA Active Current

• 1.8V – 3.6V or 5V “Univolt” Read and

Program Power Supply Versions

• Block Lock Protection

• Built-in Inadvertent Program Protection

— Power-Up/Power-Down protection circuitry

— Program Enable Latch

— Program Protect Pin

• Self-Timed Program Cycle

— 5ms Program Cycle Time (Maximum)

• High Reliability

— Endurance: 100,000 cycles per byte

— Data Retention: 100 Years

— ESD protection: 2000V on all pins

• 8-Lead PDlP Package

• 16-Lead 150 mil SOIC Package

FUNCTIONAL DIAGRAM

© Xicor, Inc. 1995, 1996 Patents Pending

Characteristics subject to change without notice

6829-1.9 4/7/97 T3/C0/D0 SH

6829 ILL F01.1

COMMAND

DECODE

AND CONTROL

LOGIC

X

DECODE

LOGIC

MEMORY

ARRAY

SI

SO

CS

HOLD

STATUS

REGISTER

PROGRAMMING

CONTROL LOGIC

PP

HIGH VOLTAGE

CONTROL

SECTOR DECODE LOGIC

32

8

DATA REGISTER

SCK

DESCRIPTION

The X25F128 is a 131,072-bit CMOS SerialFlash

memory, internally organized 16K X 8. It features a

“Univolt” Program and Read voltage, Serial Peripheral

Interface (SPI), and software protocol allowing 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 controlled through a chip

select (

CS) input, allowing any number of devices to

share the same bus.

The X25F128 also features two additional inputs that

provide the end user with added flexibility. By asserting

the

HOLD input, the X25F128 will ignore transitions on

its inputs, thus allowing the host to service higher priority

interrupts. The

PP input can be used as a hardwire input

to the X25F128 disabling all program attempts to the

status register, thus providing a mechanism for limiting

end user capability of altering 0, 1/4, 1/2, or all of the

memory.

The X25F128 utilizes Xicor’s proprietary flash cell, pro-

viding a minimum endurance of 100,000 cycles and a

minimum data retention of 100 years.

X25F128

16K x 8 Bits

A V A I L A B L E

AN61 • AN75 • AN77 • AN79 • AN82