IS24C32A/B
IS24C64A/B
64K-bit/32K-bit
2-WIRE SERIAL CMOS EEPROM
JANUARY 2008
FEATURES
DESCRIPTION
• Two-Wire Serial Interface, I2CTM Compatible
–Bi-directional data transfer protocol
• Wide Voltage Operation
–Vcc = 1.8V to 5.5V
• 400 KHz (2.5V) and 1MHz (5.0V) Compatible
• Low Power CMOS Technology
–Standby Current less than 6 µA (5.0V)
–Read Current less than 2 mA (5.0V)
–Write Current less than 3 mA (5.0V)
• Hardware Data Protection
–IS24C32A/64A: WP protects entire array
–IS24C32B/64B: WP protects top quarter of
array
• Sequential Read Feature
• Filtered Inputs for Noise Suppression
• Self time write cycle with auto clear
5 ms max.@ 2.5V
• Organization:
–IS24C32A/B: 4Kx8 (128 pages of 32 bytes)
–IS24C64A/B: 8Kx8 (256 pages of 32 bytes)
• 32 Byte Page Write Buffer
• High Reliability
–Endurance: 1,000,000 Cycles
–Data Retention: 100 Years
• Automotive and Industrial temperature ranges
• 8-pin PDIP, 8-pin SOIC, 8-pin TSSOP, 8-pad
DFN, and 8-pin MSOP packages
• Lead-free
The IS24C32A/B and IS24C64A/B are electrically
erasable PROM devices that use the standard 2wire interface for communications. The IS24C32A/B
and IS24C64A/B contain a memory array of 32Kbits (4K x 8) and 64K-bits (8K x 8), respectively.
Each device is organized into 32 byte pages for
page write mode.
This EEPROM operates in a wide voltage range of
1.8V to 5.5V to be compatible with most application
voltages. ISSI designed this device family to be a
practical, low-power 2-wire EEPROM solution.
The devices are available in 8-pin PDIP, 8-pin
SOIC, 8-pin TSSOP, 8-pad DFN, and 8-pin MSOP
packages.
The IS24C32A/32B/64A/64B (IS24CXX) maintains
compatibility with the popular 2-wire bus protocol,
so it is easy to use in 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 this device. 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 IS24CXX
has a Write Protect pin (WP) to allow blocking of
any write instruction transmitted over the bus.
Copyright © 2007 Integrated Silicon Solution, Inc. All rights reserved. ISSI reserves the right to make changes to this specification and its products at any time
without notice. ISSI assumes no liability arising out of the application or use of any information, products or services described herein. Customers are advised to
obtain the latest version of this device specification before relying on any published information and before placing orders for products.
Integrated Silicon Solution, Inc. | www.issi.com
Rev. D
01/04/08
1
