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
Two-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 Max)
High Reliability
– Endurance: One Million Write Cycles
– Data Retention: 40 Years
Extended Temperature and Lead-free/Halogen-free
Devices Available
8-lead JEDEC PDIP, 8-lead JEDEC and EIAJ SOIC, 8-lead MAP, 8-lead TSSOP, 8-lead
SAP and 8-ball dBGA2 Packages
Die Sales: Wafer Form, Waffle Pack, and Bumped Wafers
Two-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
Two-wire bus. The device is optimized for use in many industrial and commercial appli-
cations 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, 8-lead SOIC Array Package 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.
Table 1.
Pin Configuration
Pin Name
Function
AT24C128
AT24C256
(1)
Note:
1. Not recommended for
new design; please
refer to AT24C256B
datasheet.
8-lead PDIP
A0
A1
NC
GND
1
2
3
4
8
7
6
5
VCC
WP
SCL
SDA
8-lead TSSOP
A0
A1
NC
GND
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-lead SOIC
A0
A1
NC
GND
1
2
3
4
8
7
6
5
VCC
WP
SCL
SDA
8-lead MAP
VCC
WP
SCL
SDA
8
7
6
5
1
2
3
4
A0
A1
NC
GND
Bottom View
8-ball dBGA2
VCC
WP
SCL
SDA
8
7
6
5
1
2
3
4
8-lead SAP
VCC
WP
SCL
SDA
8
7
6
5
1
2
3
4
A0
A1
NC
GND
A0
A1
NC
GND
Bottom View
Bottom View
0670S–SEEPR–5/06
1
ATMEL [ ATMEL CORPORATION ]
