Preliminary
E
CAT24WC32/64
32K/64K-Bit I2C Serial CMOS EEPROM
TM
FEATURES
■ 400 KHz I2C bus compatible*
■ Zero standby current
■ 1.8 to 6 volt read and write operation
■ Cascadable for up to eight devices
■ 32-Byte page write buffer
■ Commercial, industrial, automotive and
extended automotive temperature ranges
■ Write protection
– Entire array protected when WP at VIH
■ Self-timed write cycle with auto-clear
■ 8-pin DIP or 8-pin SOIC
■ 1,000,000 Program/erase cycles
■ 100 year data retention
■ Schmitt trigger inputs for noise protection
DESCRIPTION
The CAT24WC32/64 is a 32K/64K-bit Serial CMOS
E2PROM internally organized as 4096/8192 words of 8
bits each. Catalyst’s advanced CMOS technology sub-
stantially reduces device power requirements. The
CAT24WC32/64 features a 32-byte page write buffer.
The device operates via the I2C bus serial interface and
is available in 8-pin DIP or 8-pin SOIC packages.
PIN CONFIGURATION
BLOCK DIAGRAM
EXTERNAL LOAD
DIP Package (P)
SENSE AMPS
SHIFT REGISTERS
D
1
2
3
4
8
7
6
5
A
V
CC
WP
OUT
0
ACK
A
1
A
2
SCL
SDA
V
CC
V
SS
WORD ADDRESS
BUFFERS
COLUMN
DECODERS
V
SS
256
START/STOP
SOIC Package (J,K)
SDA
LOGIC
1
2
3
4
8
7
6
5
A
A
A
V
CC
WP
0
1
2
E2PROM
128/256 X 256
XDEC 128/256
SCL
SDA
CONTROL
LOGIC
V
SS
WP
24WC32/64 F01
PIN FUNCTIONS
Pin Name
Function
DATA IN STORAGE
A0, A1, A2
SDA
Device Address Inputs
Serial Data/Address
Serial Clock
HIGH VOLTAGE/
TIMING CONTROL
SCL
WP
Write Protect
SCL
STATE COUNTERS
VCC
+1.8V to +6V Power Supply
Ground
SLAVE
ADDRESS
COMPARATORS
A
A1
A2
0
VSS
24WC32/64 F02
2
* Catalyst Semiconductor is licensed by Philips Corporation to carry the I C Bus Protocol.
© 2003 by Catalyst Semiconductor, Inc.
Doc. No. 1039, Rev. C
Characteristics subject to change without notice
1