CAT24WC66
64K-Bit I
2
C Serial CMOS EEPROM
FEATURES
s
400 kHz I
2
C bus compatible*
s
1.8 to 6 volt read and write operation
s
Cascadable for up to eight devices
s
32-byte page write buffer
s
Self-timed write cycle with auto-clear
s
Schmitt trigger inputs for noise protection
H
GEN
FR
ALO
EE
LE
A
D
F
R
E
E
TM
s
Commercial, industrial and automotive
temperature ranges
s
Write protection
–Top 1/4 array protected when WP at V
IH
s
1,000,000 program/erase cycles
s
100 year data retention
s
8-pin DIP or 8-pin SOIC packages
DESCRIPTION
The CAT24WC66 is a 64K-bit Serial CMOS EEPROM
internally organized as 8192 words of 8 bits each.
Catalyst’s advanced CMOS technology substantially
reduces device power requirements. The
CAT24WC66 features a 32-byte page write buffer. The
device operates via the I
2
C bus serial interface and is
available in 8-pin DIP or 8-pin SOIC packages.
PIN CONFIGURATION
DIP Package (P, L)
A0
A1
A2
VSS
1
2
3
4
8
7
6
5
VCC
WP
SCL
SDA
BLOCK DIAGRAM
EXTERNAL LOAD
DOUT
ACK
VCC
VSS
WORD ADDRESS
BUFFERS
COLUMN
DECODERS
256
SENSE AMPS
SHIFT REGISTERS
SOIC Package (J, K, W, X)
A0
A1
A2
VSS
1
2
3
4
8
7
6
5
VCC
WP
SCL
SDA
SDA
START/STOP
LOGIC
XDEC
WP
CONTROL
LOGIC
256
EEPROM
256 X 256
PIN FUNCTIONS
Pin Name
A0, A1, A2
SDA
SCL
WP
V
CC
V
SS
Function
Device Address Inputs
Serial Data/Address
Serial Clock
Write Protect
+1.8V to +6V Power Supply
Ground
SCL
A0
A1
A2
STATE COUNTERS
SLAVE
ADDRESS
COMPARATORS
HIGH VOLTAGE/
TIMING CONTROL
DATA IN STORAGE
* Catalyst Semiconductor is licensed by Philips Corporation to carry the I
2
C Bus Protocol.
© 2005 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
Doc. No. 1037, Rev. H
1
CATALYST [ CATALYST SEMICONDUCTOR ]
