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CAT25C128/256

128K/256K-Bit SPI Serial CMOS E

2

PROM

FEATURES

s

5 MHz SPI Compatible

s

1.8 to 6.0 Volt Operation

s

Hardware and Software Protection

s

Zero Standby Current

s

Low Power CMOS Technology

s

SPI Modes (0,0 &1,1)

s

Commercial, Industrial and Automotive

s

100,000 Program/Erase Cycles

s

100 Year Data Retention

s

Self-Timed Write Cycle

s

8-Pin DIP/SOIC, 16-Pin SOIC, 14-Pin TSSOP

and 20-Pin TSSOP

s

64-Byte Page Write Buffer

s

Block Write Protection

Temperature Ranges

鈥?Protect 1/4, 1/2 or all of E

2

PROM Array

DESCRIPTION

The CAT25C128/256 is a 128K/256K-Bit SPI Serial

CMOS E

2

PROM internally organized as 16Kx8/32Kx8

bits. Catalyst鈥檚 advanced CMOS Technology substan-

tially reduces device power requirements. The

CAT25C128/256 features a 64-byte page write buffer.

The device operates via the SPI bus serial interface and

is enabled though a Chip Select (CS). In addition to the

Chip Select, the clock input (SCK), data in (SI) and data

out (SO) are required to access the device. The

HOLD

pin may be used to suspend any serial communication

without resetting the serial sequence. The CAT25C128/

256 is designed with software and hardware write pro-

tection features including Block Lock protection. The

device is available in 8-pin DIP, 8-pin SOIC, 16-pin

SOIC, 14-pin TSSOP and 20-pin TSSOP packages.

PIN CONFIGURATION

SOIC Package (S, K) TSSOP Package (U14)

CS

SO

WP

VSS

1

2

3

4

8

7

6

5

VCC

HOLD

SCK

SI

BLOCK DIAGRAM

DIP Package (P)

CS

SO

WP

VSS

1

2

3

4

8

7

6

5

VCC

HOLD

SCK

SI

WORD ADDRESS

BUFFERS

SENSE AMPS

SHIFT REGISTERS

SOIC Package (S16)

CS

SO

NC

NC

NC

NC

WP

V

SS

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

VCC

HOLD

NC

NC

NC

NC

SCK

SI

CS

SO

NC

NC

NC

WP

V

SS

1

2

3

4

5

6

7

14

13

12

11

10

9

8

VCC

HOLD

NC

NC

NC

SCK

SI

COLUMN

DECODERS

TSSOP Package (U20)

NC

CS

SO

SO

NC

NC

WP

V

SS

NC

NC

PIN FUNCTIONS

Pin Name

SO

SCK

WP

V

CC

V

SS

CS

SI

HOLD

NC

1

2

3

4

5

6

7

8

9

10

20

19

18

17

16

15

14

13

12

11

NC

VCC

HOLD

HOLD

NC

NC

SCK

SI

NC

NC

SO

SI

CS

WP

HOLD

SCK

I/O

CONTROL

SPI

CONTROL

LOGIC

BLOCK

PROTECT

LOGIC

CONTROL LOGIC

XDEC

E

2

PROM

ARRAY

Function

Serial Data Output

Serial Clock

Write Protect

+1.8V to +6.0V Power Supply

Ground

Chip Select

Serial Data Input

Suspends Serial Input

No Connect

STATUS

REGISTER

DATA IN

STORAGE

HIGH VOLTAGE/

TIMING CONTROL

25C128 F02

Note: CAT25C256 not available in 8-Lead S or U packages.

Doc. No. 25088-00 1/01

漏 2001 by Catalyst Semiconductor, Inc.

Characteristics subject to change without notice

1

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  128K/256K-Bit SPI Serial CMOS E2PROM
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• 25C256
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  128K/256K-Bit SPI Serial CMOS E2PROM
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