CAT93C66
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
DESCRIPTION
The CAT93C66 is a 4-Kb CMOS Serial EEPROM
device which is organized as either 256 registers of 16
bits (ORG pin at V
CC
) or 512 registers of 8 bits (ORG
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.
PIN CONFIGURATION
PDIP (L)
SOIC (V, X)
TSSOP (Y)
TDFN (VP2, ZD4)*
CS
SK
DI
DO
1
2
3
4
8 V
CC
7 NC
6 ORG
5 GND
NC
V
CC
CS
SK
FUNCTIONAL SYMBOL
V
CC
SOIC (W)
1
2
3
4
8 ORG
7 GND
6 DO
5 DI
ORG
CS
SK
DI
CAT93C66
DO
* TDFN 3x3mm (ZD4) package is available only for Die Rev E
(not recommended for new designs)
GND
PIN FUNCTION
Pin Name
CS
SK
DI
DO
V
CC
GND
ORG
NC
Function
Chip Select
Clock Input
Serial Data Input
Serial Data Output
Power Supply
Ground
Memory Organization
No Connection
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
© 2007 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. 1089 Rev. P
CATALYST [ CATALYST SEMICONDUCTOR ]
