Document
AT24C128C
I2C-Compatible (2-Wire) Serial EEPROM 128-Kbit (16,384 x 8)
DATASHEET
Features
Low-voltage and Standard-voltage Operation ̶ VCC = 1.7V to 5.5V
Internally Organized as 16,384 x 8 2-wire Serial Interface Schmitt Trigger, Filtered Inputs for Noise Suppression Bidirectional Data Transfer Protocol 400kHz (1.7V) and 1MHz (2.5V, 2.7V, 5.0V) Compatibility Write Protect Pin for Hardware Protection 64-byte Page Write Mode
̶ Partial Page Writes Allowed Self-timed Write Cycle (5ms Max) High Reliability
̶ Endurance: 1,000,000 Write Cycles ̶ Data Retention: 40 Years Lead-free/Halogen-free Devices Available Green Package Options (Pb/Halide-free/RoHS Compliant) ̶ 8-lead JEDEC SOIC, 8-lead TSSOP, 8-pad UDFN, 8-pad XDFN,
8-ball VFBGA, and 4-ball WLCSP Packages Die Sale Options: Wafer Form, Waffle Pack, and Bumped Wafers
Description
The Atmel® AT24C128C provides 131,072-bits of Serial Electrically Erasable and Programmable Read-Only Memory (EEPROM) organized as 16,384 words of 8 bits each. The device’s cascading feature allows up to eight 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-lead JEDEC SOIC, 8-lead TSSOP, 8-pad UDFN, 8-pad XDFN, 8-ball VFBGA, and 4-ball WLCSP packages. In addition, this device operates from 1.7V to 5.5V.
Atmel-8734D-SEEPROM-AT24C128C-Datasheet_082015
1. Pin Configurations and Pinouts
Table 1-1.
Pin A0 A1 A2 GND SDA SCL WP VCC
Pin Configuration
Function Address Input Address Input Address Input Ground Serial Data Serial Clock Input Write Protect Device Power Supply
8-lead SOIC
A0 A1 A2 GND
18 27 36 45
Top View
VCC WP SCL SDA
A0 A1 A2 GND
8-lead TSSOP
18 27 36 45
Top View
VCC WP SCL SDA
8-pad UDFN/XDFN
8-ball VFBGA
A0 A1 A2 GND
18 27 36 45
Top View
VCC WP SCL SDA
A0 1 8 VCC A1 2 7 WP A2 3 6 SCL GND 4 5 SDA
Top View
4-ball WLCSP
VCC SCL SDA GND
Top View
2. Absolute Maximum Ratings*
Operating Temperature . . . . . . . . . . .-55°C to +125°C
Storage Temperature . . . . . . . . . . . -65°C to + 150°C
Voltage on any pin with respect to ground . . . . . . . . . . . . . . . -1.0 V +7.0V
Maximum Operating Voltage . . . . . . . . . . . . . . . 6.25V
DC Output Current . . . . . . . . . . . . . . . . . . . . . . .5.0mA
*Notice: Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this specification are not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
2 AT24C128C [DATASHEET]
Atmel-8734D-SEEPROM-AT24C128C-Datasheet_082015
3. Block Diagram
Figure 3-1.
Block Diagram
VCC GND
WP
SCL SDA
A2 A1 A0
Start Stop Logic
LOAD
Device Address Comparator
Serial Control Logic
COMP
LOAD INC
EN H.V. Pump/Timing Data Recovery
R/W Data Word Addr/Counter
EEPROM
X DEC
DIN DOUT
Y DEC
Serial MUX
DOUT/ACK LOGIC
4. Pin Descriptions
Serial Clock (SCL): The SCL input is used to positive-edge clock data into each EEPROM device and negativeedge clock data out of each device.
Serial Data (SDA): The SDA pin is bidirectional for serial data transfer. This pin is open drain driven and may be wire-ORed with any number of other open-drain or open-collector devices.
Device Addresses (A2, A1, A0): The A2, A1, and A0 pins are device address inputs that are hard wired (directly to GND or to VCC) for compatibility with other Atmel AT24C devices. When the pins are hard wired, as many as eight 128K devices may be addressed on a single bus system. (Device addressing is discussed in detail in Section 7. “Device Addressing” on page 9). A device is selected when a corresponding hardware and software match is true. If these pins are left floating, the A2, A1, and A0 pins will be internally pulled down to GND. However, due to capacitive coupling that may appear during customer applications, Atmel recommends always connecting the address pins to a known state. When using a pull-up resistor, Atmel recommends using 10k or less.
Write Protect (WP): The Write Protect input, when connected to GND, allows normal write operations. When WP is connected directly to VCC, all write operations to the memory are inhibited. If the pin is left floating, the WP pin will be internally pulled down to GND. However, due to capacitive coupling that may appear during customer applications, Atmel recommends always connecting the WP pins to a known state. When using a pull-up resistor, Atmel recommends using 10k or less.
Table 4-1. Write Protect
WP Pin Status At VCC At GND
Part of the Array Protected Full Array
Normal Read/Write Operations
AT24C128C [DATASHEET]
Atmel-8734D-SEEPROM-AT24C128C-Datasheet_082015
3
5. Memory Organization
AT24C128C, 128K Serial EEPROM: The 128K is int.