CAT93C66

© 2007 Catalyst Semiconductor, Inc.

1

Doc. No. 1089 Rev. P

Characteristics subject to change without notice

4-Kb Microwire Serial CMOS EEPROM

FEATURES

High speed operation: 2MHz

1.8V to 5.5V supply voltage range

Selectable x8 or x16 memory organization

Sequential read

Software write protection

Power-up inadvertant write protection

Low power CMOS technology

1,000,000 Program/erase cycles

100 year data retention

Industrial temperature ranges

RoHS-compliant 8-pin PDIP, SOIC, TSSOP and

8-pad TDFN packages

PIN CONFIGURATION

PDIP (L)

SOIC (V, X)

TSSOP (Y)

TDFN (VP2, ZD4)*

CS

1

SK

2

7 NC

DI

3

6 ORG

DO

4

5 GND

SOIC (W)

NC

1

8 ORG

7 GND

CS

3

6 DO

SK

4

5DI

* TDFN 3x3mm (ZD4) package is available only for Die Rev E

(not recommended for new designs)

PIN FUNCTION

Pin Name

Function

CS

Chip Select

SK

Clock Input

DI

Serial Data Input

DO

Serial Data Output

Power Supply

GND

Ground

ORG

Memory Organization

NC

No Connection

DESCRIPTION

The CAT93C66 is a 4-Kb CMOS Serial EEPROM

device which is organized as either 256 registers of 16

pin at GND). Each register can be written (or read)

serially by using the DI (or DO) pin. The CAT93C66

features sequential read and self-timed internal write

with auto-clear. On-chip Power-On Reset circuitry

protects the internal logic against powering up in the

wrong state.

For Ordering Information details, see page 15.

FUNCTIONAL SYMBOL

CS

SK

DI

ORG

DO

CAT93C66

GND

Note: When the ORG pin is connected to VCC, the x16 organization

is selected. When it is connected to ground, the x8 organization is

selected. If the ORG pin is left unconnected, then an internal pullup

device will select the x16 organization