Features
• Low-voltage and Standard-voltage Operation
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– 5.0 (VCC = 4.5V to 5.5V)
– 2.7 (VCC = 2.7V to 5.5V)
– 2.5 (VCC = 2.5V to 5.5V)
– 1.8 (VCC = 1.8V to 3.6V)
Internally Organized 16,384 x 8 and 32,768 x 8
2-wire Serial Interface
Schmitt Trigger, Filtered Inputs for Noise Suppression
Bidirectional Data Transfer Protocol
1 MHz (5V), 400 kHz (2.7V, 2.5V) and 100 kHz (1.8V) Compatibility
Write Protect Pin for Hardware and Software Data Protection
64-byte Page Write Mode (Partial Page Writes Allowed)
Self-timed Write Cycle (5 ms Typical)
High Reliability
– Endurance: 100,000 Write Cycles
– Data Retention: 40 Years
– ESD Protection: >4000V
Automotive Grade and Extended Temperature Devices Available
8-pin JEDEC PDIP, 8-pin JEDEC and EIAJ SOIC, 14-pin TSSOP, 8-pin Leadless Array,
and 8-ball dBGATM Packages
Description
The AT24C128/256 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’s cascadable feature allows up to 4 devices to share a common
2-wire bus. 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, 8-pin EIAJ, 8-pin JEDEC SOIC, 14-pin
TSSOP, 8-pin LAP, and 8-ball dBGA packages. In addition, the entire family is available in 5.0V (4.5V to 5.5V), 2.7V (2.7V to 5.5V), 2.5V (2.5V to 5.5V) and 1.8V (1.8V to
3.6V) versions.
Pin Configurations
8-pin PDIP
2-wire Serial
EEPROMs
128K (16,384 x 8)
256K (32,768 x 8)
AT24C128
AT24C256
8-pin SOIC
Pin Name
Function
A0 - A1
Address Inputs
SDA
Serial Data
SCL
WP
Write Protect
No Connect
VCC
WP
SCL
SDA
1
2
3
4
8-pin Leadless Array
NC
A0
A1
NC
GND
VCC
WP
SCL
SDA
8
7
6
5
Serial Clock Input
A0
A1
NC
GND
8
7
6
5
1
2
3
4
8
7
6
5
VCC
WP
SCL
SDA
1
2
3
4
A0
A1
NC
GND
8-ball dBGA
VCC
WP
SCL
SDA
Bottom View
8
1
7
2
6
3
5
4
A0
A1
NC
GND
Bottom View
14-pin TSSOP
A0
A1
NC
NC
NC
NC
GND
1
2
3
4
5
6
7
14
13
12
11
10
9
8
VCC
WP
NC
NC
NC
SCL
SDA
Rev. 0670E–07/01
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