®
IS24C52
ISSI
2k-bit 2-WIRE SERIAL CMOS EEPROM
with Permanent Write-Protection
ADVANCEDINFORMATION
JANUARY2004
FEATURES
DESCRIPTION
• Two-Wire Serial Interface
The IS24C52 is an electrically erasable PROM device
that uses the standard 2-wire interface for
– Bidirectional data transfer protocol
– 400 kHz (I2C TM Protocol) Compatibility
communications. The IS24C52 contains a memory array
of 2,048-bits (256K x 8), and is further subdivided into 16
pages of 16 bytes each for page-write mode. The
software write-protection feature is initiated with a unique
irreversible instruction. After this command is
• Organization:
– 256-bit x 8-bit
transmitted, the first 128 bytes of the array become
permanently read-only. This feature is popular in
applications like DRAM DIMMs to retain DRAM related
data. This EEPROM is offered in wide operating voltages
of 1.8V to 5.5V (IS24C52-2) and 2.5V to 5.5V (IS24C52-
3) to be compatible with most application voltages. ISSI
designed the IS24C52 as a low-cost and low-power 2-
wire EEPROM solution. The devices are packaged in 8-
pin SOIC, and 8-pin TSSOP, and 8-pin MSOP.
• Data Protection Features
– Write Protect Pin
– Permanent Software Protection
• 16-Byte Page Write Buffer
– Partial Page-writes permitted
• Low Power CMOS Technology
– Active Current less than 2 mA (5V)
– Standby Current less than 6 µA (5V)
– Standby Current less than 2 µA (2.5V)
• Low Voltage Operation
The IS24C52 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 the IS24C52. 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 IS24C52 has a Write Protect pin (WP)
to allow blocking of any write instruction transmitted over
the bus.
– IS24C52-2: Vcc = 1.8V to 5.5V
– IS24C52-3: Vcc = 2.5V to 5.5V
• Random or Sequential Read Modes
• Filtered Inputs for Noise Suppression
• Self timed Write cycle with auto clear
– 5 ms @ 2.5V
• HighReliability
– Endurance: 1,000,000 Cycles
– Data Retention: 40 Years
• Commercial and Industrial temperature ranges
• 8-pin SOIC, 8-pin TSSOP, and 8-pin MSOP
Copyright © 2004 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
arisingoutoftheapplicationoruseofanyinformation, productsorservicesdescribedherein. Customersareadvisedtoobtainthelatestversionofthisdevicespecificationbeforerelyingonanypublished
informationandbeforeplacingordersforproducts.
Integrated Silicon Solution, Inc. — www.issi.com — 1-800-379-4774
PRELIMINARYINFORMATION Rev.00B
1
01/26/04