鈥?/div>
2-Wire Serial
EEPROMs
with Permanent
Software Write
Protect
128K (16,384 x 8)
256K (32,768 x 8)
Description
The AT24CS128/256 provides 131,072/262,144 bits of serial electrically erasable and
programmable read only memory (EEPROM) organized as 16,384/32,768 words of 8
bits each. The device鈥檚 cascadable feature allows up to 4 devices to share a common
2-wire bus. The device also features a one-time programmable 2048 bit array, which
once enabled, becomes read-only and cannot be overwritten. If not enabled, the OTP
section will function as part of the normal memory array. The device is optimized for
use in many industrial and commercial applications where low power and low voltage
operation are essential. The devices are available in space-saving 8-pin JEDEC PDIP
(AT24CS128/256), 8-pin EIAJ (AT24CS128/256), 8-pin JEDEC SOIC (AT24CS128)
packages. In addition, the entire family is available in 5.0V (4.5V to 5.5V), 2.7V (2.7V
to 5.5V) and 1.8V (1.8V to 3.6V) versions.
Pin Configurations
Pin Name
A0 to A2
SDA
SCL
WP
Function
Address Inputs
Serial Data
Serial Clock Input
Write Protect
A0
A1
A2
GND
8-Pin PDIP
1
2
3
4
8
7
6
5
VCC
WP
SCL
SDA
AT24CS128
AT24CS256
with Permanent
Software Write
Protect
Advanced
Information
8-Pin SOIC
A0
A1
A2
GND
1
2
3
4
8
7
6
5
VCC
WP
SCL
SDA
Rev. 1152A鈥?9/98
1