ISSI
IS93C66-3
4,096-BIT SERIAL ELECTRICALLY
ERASABLE PROM
®
MARCH 2001
FEATURES
OVERVIEW
• State-of-the-art architecture
— Non-volatile data storage
— Low voltage operation:
3.0V (Vcc = 2.7V to 6.0V)
— Full TTL compatible inputs and outputs
— Auto increment for efficient data dump
• Low voltage read operation
— Down to 2.7V
• Hardware and software write protection
— Defaults to write-disabled state at power-up
— Software instructions for write-enable/disable
• Advanced low voltage CMOS E2PROM
technology
• Versatile, easy-to-use interface
— Self-timed programming cycle
— Automatic erase-before-write
— Programming status indicator
— Word and chip erasable
— Stop SK anytime for power savings
• Durable and reliable
— 10-year data retention after 100K write cycles
— 100,000 write cycles
— Unlimited read cycles
The IS93C66-3 is a low cost 4,096-bit, non-volatile, serial
E2PROM. It is fabricated using ISSI's advanced CMOS
E2PROM technology. The IS93C66-3 provides efficient
non-volatile read/write memory arranged as 256 registers
of 16 bits each. Seven 11-bit instructions control the
operation of the device, which includes read, write, and
mode enable functions. The data out pin (DOUT) indicates
the status of the device during in the self-timed non-volatile
programming cycle.
The self-timed write cycle includes an automatic erasebefore-write capability. To protect against inadvertent
writes, the WRITE instruction is accepted only while the
chip is in the write enabled state. Data is written in 16 bits
per write instruction into the selected register. If Chip
Select (CS) is brought HIGH after initiation of the write cycle,
the Data Output (DOUT) pin will indicate the READY/BUSY
status of the chip.
APPLICATIONS
The IS93C66-3 is ideal for high-volume applications
requiring low power and low density storage. This device
uses a low cost, space saving 8-pin package. Candidate
applications include robotics, alarm devices, electronic
locks, meters and instrumentation settings.
FUNCTIONAL BLOCK DIAGRAM
DATA
REGISTER
(16 BITS)
INSTRUCTION
REGISTER
(11 BITS)
DIN
CS
SK
DUMMY
BIT
DOUT
R/W
AMPS
INSTRUCTION
DECODE,
CONTROL,
AND
CLOCK
GENERATION
ADDRESS
REGISTER
1 OF 256
DECODER
EEPROM
ARRAY
(256 X 16)
WRITE
ENABLE
HIGH VOLTAGE
GENERATOR
ISSI reserves the right to make changes to its products at any time without notice in order to improve design and supply the best possible product. We assume no responsibility for any
errors which may appear in this publication. © Copyright 2001, Integrated Silicon Solution, Inc.
Integrated Silicon Solution, Inc. — 1-800-379-4774
Rev. G
04/26/01
1
