CAT24FC256
256K-Bit I
2
C Serial CMOS EEPROM
FEATURES
I
Fast mode I
2
C bus compatible*
I
Max clock frequency:
I
Industrial and automotive
H
LOGEN
FR
A
EE
LE
temperature ranges
I
5 ms max write cycle time
I
Write protect feature
A
D
F
R
E
E
TM
- 400kHz for V
CC
= 1.8 V to 5.5 V
- 1MHz for V
CC
= 2.5 V to 5.5 V
I
Schmitt trigger filtered inputs for noise suppression
I
Low power CMOS technology
I
64-byte page write buffer
I
Self-timed write cycle with auto-clear
– Entire array protected when WP at V
IH
I
100,000 program/erase cycles
I
100 year data retention
I
8-pin DIP or 8-pin SOIC(JEDEC) and 8-pin SOIC
(EIAJ)
DESCRIPTION
The CAT24FC256 is a 256K-bit Serial CMOS EEPROM
internally organized as 32,768 words of 8 bits each.
Catalyst’s advanced CMOS technology substantially
reduces device power requirements. The CAT24FC256
features a 64-byte page write buffer. The device oper-
ates 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
512
SENSE AMPS
SHIFT REGISTERS
SOIC Package (J, W, K, 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
512
EEPROM
512X512
PIN FUNCTIONS
Pin Name
A0, A1, A2
SDA
SCL
WP
V
CC
V
SS
NC
Function
Address Inputs
Serial Data/Address
Serial Clock
Write Protect
+1.8V to +5.5V Power Supply
Ground
No Connect
A0
A1
A2
SLAVE
ADDRESS
COMPARATORS
SCL
STATE COUNTERS
HIGH VOLTAGE/
TIMING CONTROL
DATA IN STORAGE
* Catalyst Semiconductor is licensed by Philips Corporation to carry the I
2
C Bus Protocol.
© 2004 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. 1040, Rev. J
CATALYST [ CATALYST SEMICONDUCTOR ]
