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AT24C256B-TH-B Datasheet(PDF) 1 Page - ATMEL Corporation

Part # AT24C256B-TH-B
Description  Two-wire Serial EEPROM
Download  24 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT24C256B-TH-B Datasheet(HTML) 1 Page - ATMEL Corporation

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Features
Low-voltage and Standard-voltage Operation
– 1.8 (VCC = 1.8V to 5.5V)
Internally Organized as 32,768 x 8
Two-wire Serial Interface
Schmitt Trigger, Filtered Inputs for Noise Suppression
Bidirectional Data Transfer Protocol
1 MHz (5.0V, 2.7V, 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)
High Reliability
– Endurance: One Million Write Cycles
– Data Retention: 40 Years
Lead-free/Halogen-free Devices Available
8-lead JEDEC PDIP, 8-lead JEDEC SOIC, EIAJ SOIC, 8-lead Ultra Thin Small Array
Package (SAP), 8-lead TSSOP, and 8-ball dBGA2 Packages
Die Sales: Wafer Form, Waffle Pack and Bumped Wafers
Description
The AT24C256B provides 262,144 bits of serial electrically erasable and programma-
ble read-only memory (EEPROM) organized as 32,768 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 SAP, 8-
lead TSSOP, and 8-ball dBGA2 packages. In addition, the entire family is available in
a 1.8V (1.8V to 5.5V) version.
Two-wire Serial
EEPROM
256K (32,768 x 8)
AT24C256B
Rev. 5279C–SEEPR–3/09
Pin Configurations
Pin Name
Function
A0–A2
Address Inputs
SDA
Serial Data
SCL
Serial Clock Input
WP
Write Protect
GND
Ground
A0
A1
A2
GND
VCC
WP
SCL
SDA
1
2
3
4
8
7
6
5
VCC
WP
SCL
SDA
8
7
6
5
1
2
3
4
A0
A1
A2
GND
8
7
6
5
1
2
3
4
VCC
WP
SCL
SDA
A0
A1
A2
GND
8-lead PDIP
8-lead SOIC
8-lead dBGA2
Bottom View
8
7
6
5
1
2
3
4
VCC
WP
SCL
SDA
A0
A1
A2
GND
8-lead Ultra Thin SAP
Bottom View
A0
A1
A2
GND
VCC
WP
SCL
SDA
1
2
3
4
8
7
6
5
8-lead TSSOP


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