描述 Description

The AT24C256B provides 262,144 bits of serial electrically erasable and programmable 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.

特性 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