1. Features
• Low-voltage and Standard-voltage Operation
– 1.8 (VCC = 1.8V to 5.5V)
• Internally Organized as 16,384 x 8
• Two-wire Serial Interface
• Schmitt Trigger, Filtered Inputs for Noise Suppression
• Bidirectional Data Transfer Protocol
• 1 MHz (5.5V, 2.5V), and 400 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)
Two-wire Serial
EEPROM
• High Reliability
– Endurance: One Million Write Cycles
128K (16,384 x 8)
– Data Retention: 40 Years
• Lead-free/Halogen-free
• 8-lead JEDEC PDIP, 8-lead JEDEC SOIC, 8-lead Ultra Thin Mini MAP, 8-lead Ultra Lead
Frame Land Grid Array (ULA), 8-lead TSSOP, and 8-ball dBGA2 Packages
• Die Sales: Wafer Form, Tape and Reel and Bumped Wafers
AT24C128B
2. Description
The AT24C128B provides 131,072 bits of serial electrically erasable and programma-
ble read-only memory (EEPROM) organized as 16,384 words of 8 bits each. The
device’s cascadable feature allows up to eight devices to share a common two-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-lead JEDEC PDIP, 8-lead JEDEC SOIC, 8-lead Ultra Thin Mini
MAP, 8-lead Ultra Lead Frame Land Grid Array (ULA), 8-lead TSSOP, and 8-ball
dBGA2 packages. In addition, the entire family is available in a 1.8V (5.5V to 3.6V)
version.
8-lead PDIP
8-lead SOIC
1
2
3
4
A0
A1
8
7
6
5
VCC
WP
8
7
6
5
A0
A1
1
2
3
4
VCC
WP
Table 0-1.
Pin Configurations
A2
SCL
SDA
A2
SCL
SDA
GND
GND
Pin Name
A0–A2
SDA
Function
Address Inputs
Serial Data
Serial Clock Input
Write Protect
Ground
8-lead dBGA2
8-lead TSSOP
VCC
8
7
6
5
1
2
3
4
A0
8
7
6
5
A0
1
2
3
4
VCC
WP
SCL
SDA
A1
A1
A2
WP
SCL
A2
SCL
SDA
GND
GND
WP
Bottom View
8-lead Ultra Lead Frame Land Grid Array
GND
8-lead Ultra Thin Mini MAP
VCC
WP
8
7
6
5
1
2
3
4
A0
VCC
WP
8
7
6
5
1
2
3
4
A0
A1
A1
SCL
SDA
A2
SCL
SDA
A2
GND
GND
Bottom View
Bottom View
Rev. 5296A–SEEPR–1/08