Features
•
Low-voltage and Standard-voltage Operation
•
•
•
•
•
•
•
•
•
•
•
– 2.7 (V
CC
= 2.7V to 5.5V)
– 1.8 (V
CC
= 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: One Million Write Cycles
– Data Retention: 40 Years
Automotive Grade, Extended Temperature and Lead-Free Devices Available
8-lead JEDEC PDIP, 8-lead JEDEC and EIAJ SOIC, 8-lead MAP, 8-lead TSSOP and 8-ball
dBGA2
TM
Packages
2-wire Serial
EEPROMs
128K (16,384 x 8)
256K (32,768 x 8)
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 applica-
tions where low power and low voltage operation are essential. The devices are
available in space-saving 8-lead JEDEC PDIP, 8-lead JEDEC SOIC, 8-lead EIAJ
SOIC, 8-lead MAP (24C128), 8-lead TSSOP and 8-ball dBGA2 packages. In addition,
the entire family is available in 2.7V (2.7V to 5.5V) and 1.8V (1.8V to 3.6V) versions.
AT24C128
AT24C256
Pin Configurations
Pin Name
Function
8-lead PDIP
A0
A1
NC
GND
1
2
3
4
8
7
6
5
VCC
WP
SCL
SDA
A0
A1
NC
GND
8-lead SOIC
1
2
3
4
8
7
6
5
VCC
WP
SCL
SDA
A0 - A1
SDA
SCL
WP
NC
GND
Address Inputs
Serial Data
Serial Clock Input
Write Protect
No Connect
Ground
8-ball dBGA2
VCC
WP
SCL
SDA
8
7
6
5
1
2
3
4
8-lead TSSOP
A0
A1
NC
GND
1
2
3
4
8
7
6
5
VCC
WP
SCL
SDA
A0
A1
NC
GND
Bottom View
8-lead MAP
VCC
WP
SCL
SDA
8
7
6
5
1
2
3
4
A0
A1
NC
GND
Bottom View
Rev. 0670K–SEEPR–7/03
1
ATMEL [ ATMEL CORPORATION ]
