X84041

1

4K

X84041

DESCRIPTION

The X84041 Micro Port Saver is a 4096-bit CMOS

microcontroller or I/O limited microprocessor designs.

The X84041 provides all of the benefits of serial memo-

ries, such as low cost, low power, low voltage operation,

and small package size, while featuring higher data

transfer rates and reduced interface code requirements—

without the need for a dedicated serial bus. The X84041

is organized as a 512 x 8, but is also suitable in 16-bit or

32-bit environments, due to the bit serial nature of the

interface.

The X84041 directly connects to the processor bus and

communicates over a single data line using a sequence

of standard bus read and write operations. This elimi-

nates the need for dedicated port pins, parallel to serial

converters, complicated ASIC implementations, or other

glue logic, lowering system cost.

FEATURES

• Direct Interface to Micros

—Eliminates I/O port requirements

—No interface glue logic required

—Eliminates need for parallel to serial converters

• 3.3Mbps data transfer rate

• Low Power CMOS

—2.7V to 5.5V Operation

—Standby Current Less than 50

—Active Current Less than 1mA

• 45ns Read Access Time

• 8-Byte Page Write Mode

• Typical Nonvolatile Write Cycle Time: 5ms

• High Reliability

—100,000 Endurance Cycles

—Guaranteed Data Retention: 100 Years

• 8-Lead PDIP, 8-Lead SOIC, and

14-Lead TSSOP Packages

© Xicor, Inc. 1994, 1995, 1996 Patents Pending

Characteristics subject to change without notice

2704-4.4 6/12/96 T3/C1/D0 NS

CE

I/O

H.V. GENERATION

TIMING & CONTROL

EEPROM

ARRAY

512 x 8

COMMAND

DECODE

AND

CONTROL

LOGIC

X

DEC

Y DECODE

DATA REGISTER

WP

2704 ILL F02

OE

WE

PIN NAMES

I/O

Data Input/Output

CE

Chip Enable Input

OE

Output Enable Input

WE

Write Enable Input

WP

Write Protect Input

Supply Voltage

Ground

NC

No Connect

2704 PGM T01

PIN CONFIGURATION

BLOCK DIAGRAM

A V AILABLE

AN10 • AN17 • AN57 • XK84

VCC

NC

OE

WE

2704 ILL F01.2

CE

I/O

WP

VSS

1

2

3

4

8

7

6

5

X84041

DIP/SOIC

1

2

3

4

5

6

7

14

13

12

11

10

9

8

2704 ILL F02a.1

TSSOP

X84041

CE

I/O

NC

NC

NC

WP

V

SS

V

CC

NC

NC

NC

NC

OE

WE