Product Summary

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 PageWrite 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


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


? 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 μA (5V)
– Standby Current less than 2 μA (2.5V)
? Wide Voltage Operation
– IS24C256-2: Vcc = 1.8V to 5.5V
– IS24C256-3: Vcc = 2.5V to 5.5V
? 1 MHz (I2CTM 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