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Integrated Silicon Solution, Inc. — www.issi.com
1
Advanced Information Rev. 00C
07/16/09
IS25C32B
Copyright 2009 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 products are not designed, intended, authorized or warranted for use as components in systems or equipment intended for critical medical or surgical
equipment, aerospace or military, or other applications planned to support or sustain life. It is the customer's obligation to optimize the design in their own products for
the best performance and optimization on the functionality and etc. 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 prior placing orders for
products.
32K-BIT SPI SERIAL CMOS EEPROM
FEATURES
Serial Peripheral Interface (SPI) Compatible
— Supports SPI Modes 0 (0,0) and 3 (1,1)
Wide Voltage Operation
— Vcc = 1.8V to 5.5V
Low power CMOS
— Active current less than 1 mA (1.8V)
— Standby current less than 1 A (1.8V)
Block Write Protection
— Protect 1/4, 1/2, or Entire Array
32 byte page write mode
— Partial page writes allowed
10 MHz Clock Rate (5V)
Self timed write cycles
— 5 ms max @ 2.5V
High-reliability
— Endurance: 1 million cycles
— Data retention: 100 years
Packages (8-pin): SOIC/SOP, TSSOP, PDIP, and DFN
Advanced Information
JULY 2009
The IS25C32B is an electrically erasable PROM device
that uses the Serial Peripheral Interface (SPI) for
communications. The IS25C32B is 32Kbit (4096 x 8). It
is offered in a wide operating voltage range of 1.8V to
5.5V to be compatible with most application voltages.
ISSI designed the IS25C32B to be an efficient SPI
EEPROM solution. The devices are packaged in 8-pin
SOIC, 8-pin TSSOP, 8-pin PDIP, and 8-pad DFN.
The functional features of the IS25C32B allows them to
be among the most advanced serial non-volatile memo-
ries available. Each device has a Chip-Select (CS) pin,
and a 3-wire interface of Serial Data In (SI), Serial Data
Out (SO), and Serial Clock (SCK). While the 3-wire
interface of the IS25C32B provides for high-speed ac-
cess, a HOLD pin allows the memories to ignore the
interface in a suspended state; later the HOLD pin re-
activates communication without re-initializing the serial
sequence. A Status Register facilitates a flexible write
protection mechanism, and a device-ready bit (RDY).
DESCRIPTION