IS24C256

Features:

• Organization:
32K-bit x 8-bit
• 64-Byte Page Write Buffer
• Two-Wire Serial Interface
   Bi-directional data transfer protocol
• Low Power CMOS Technology
   Active Current less than 3 mA (5V)
   Standby Current less than 6 A (5V)
   Standby Current less than 2 A (2.5V)
• Wide Voltage Operation
   IS24C256-2: Vcc = 1.8V to 5.5V
   IS24C256-3: Vcc = 2.5V to 5.5V
• 1 MHz (I²C^TM Protocol) Compatibility
• Hardware Data Protection
   Write Protect pin
• Sequential Read Feature
• Filtered Inputs for Noise Suppression
• Self time Write cycle with auto clear
   5 ms @ 5.0V
• High Reliability
   Endurance: 100,000 Cycles
   Data Retention: 40 Years
• Commercial and Industrial temperature ranges
• 8-pin PDIP, 8-pin SOIC, and 14-pin TSSOP


Pinout




Specifications

Symbol       Parameter                        Value                    Unit

VS               Supply Voltage                    +0.5 to +6.25           V

VP               Voltage on Any Pin             0.5 to Vcc +0.5       V

TBIAS           Temperature Under Bias      40 to +85             °C

TSTG           Storage Temperature          65 to +150           °C

IOUT            Output Current                           5                 mA

Description

The IS24C256 is an electrically erasable PROM device that uses the standard 2-wire interface for communications. The IS24C256 contains a memory array of 256K-bits (32,768 x 8), and is further subdivided into 512 pages of 64 bytes each for Page- Write mode. This EEPROM is offered in wide operating voltages of 1.8V to 5.5V (IS24C256-2) and 2.5V to 5.5V (IS24C256-3) to be compatible with most application voltages. ISSI designed the IS24C256 to be a low-cost and low-power 2-wire EEPROM solution. The devices are packaged in 8-pin PDIP, 8-pin SOIC, and 14-pin TSSOP.

The IS24C256 maintains compatibility with the popular 2-wire bus protocol, so it is easy to design into applications implementing this bus type. The simple bus consists of the Serial Clock wire (SCL) and the Serial Data wire (SDA). Using the bus, a Master device such as a microcontroller is usually connected to one or more Slave devices such as the IS24C256. The bit stream over the SDA line includes a series of bytes, which identifies a particular Slave device, an instruction, an address within that Slave device, and a series of data, if appropriate. The IS24C256 has a Write Protect pin (WP) to allow blocking of any write instruction transmitted over the bus.