CAT24WC257 Datasheet, PDF (1/10 Pages) Catalyst Semiconductor – 256K-Bit I2C Serial CMOS EEPROM

CAT24WC257
256K-Bit I²C Serial CMOS EEPROM
(CAT24WC257 not recommended for new designs. See CAT24FC257 data sheet.)
FEATURES
ALOGEN ^FR
LEA
D
F
R
E
E
TM
I 1MHz I²C bus compatible*
I 1.8 to 6 volt operation
I Low power CMOS technology
I 64-Byte page write buffer
I Self-timed write cycle with auto-clear
I Commercial, industrial and automotive
temperature ranges
I Write protect feature
– Top 1/4 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
I "Green" package options available
DESCRIPTION
The CAT24WC257 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 CAT24WC257
features a 64-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
DIP Package (P, L)
A0 ¹
A1 2
NC 3
VSS 4
8 VCC
7 WP
6 SCL
5 SDA
BLOCK DIAGRAM
EXTERNAL LOAD
VCC
VSS
DOUT
ACK
WORD ADDRESS
BUFFERS
SENSE AMPS
SHIFT REGISTERS
COLUMN
DECODERS
SOIC Package (J, W, K, X)
A0 ¹
A1 ²
NC ³
VSS ⁴
8 _VCC
7 _WP
6 _SCL
5 _SDA
PIN FUNCTIONS
Pin Name
Function
A0, A1
Address Inputs
SDA
Serial Data/Address
SCL
Serial Clock
WP
Write Protect
V_CC
+1.8V to +6.0V Power Supply
V_SS
Ground
NC
No Connect
SDA
WP
SCL
A0
A1
START/STOP
LOGIC
CONTROL
LOGIC
512
XDEC 512
EEPROM
512X512
STATE COUNTERS
SLAVE
ADDRESS
COMPARATORS
DATA IN STORAGE
HIGH VOLTAGE/
TIMING CONTROL
* Catalyst Semiconductor is licensed by Philips Corporation to carry the I²C Bus Protocol.
© 2004 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. 1030, Rev. E