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IS93C56A
IS93C66A
ISSI
MAY 2006
®
2K-BIT/4K-BIT SERIAL ELECTRICALLY ERASABLE PROM
FEATURES DESCRIPTION
• Industry-standard Microwire Interface The IS93C56A/66A are 2kb/4kb non-volatile, — Non-volatile data storage ISSI ® serial EEPROMs. They are fabricated using — Wide voltage operation: an enhanced CMOS design and process. The Vcc = 1.8V to 5.5V IS93C56A/66A contain power-efficient read/write — Auto increment for efficient data dump memory, and organization of either 256/512 bytes • User Configured Memory Organization of 8 bits or 128/256 words of 16 bits. When the — By 16-bit or by 8-bit ORG pin is connected to Vcc or left unconnected, • Hardware and software write protection x16 is selected; when it is connected to ground, — Defaults to write-disabled state at power-up x8 is selected. The IS93C56A/66A are fully — Software instructions for write-enable/disable backward compatible with IS93C56/66. 2 • Enhanced low voltage CMOS E PROM An instruction set defines the operation of the technology devices, including read, write, and mode-enable • Versatile, easy-to-use Interface functions. To protect against inadvertent data — Self-timed programming cycle modification, all erase and write instructions are — Automatic erase-before-write accepted only while the devices are write-enabled. — Programming status indicator A selected x8 byte or x16 word can be modified — Word and chip erasable with a single WRITE or ERASE instruction. Shee — Chip select enables power savings Additionally, the two instructions WRITE ALL or Data • Durable and reliable ERASE ALL can program an entire array. Once a DataSheet4U.com — 40-year data retention after 1M write cycles device begins its self-timed program procedure, — 1 million write cycles the data out pin (Dout) can indicate the READY/ — Unlimited read cycles BUSY status by raising chip select (CS). The self— Schmitt-trigger inputs timed write cycle includes an automatic erase• Industrial and Automotive Temperature Grade before-write capability. The devices can output • Lead-free available any number of consecutive bytes/words using a single READ instruction.
FUNCTIONAL BLOCK DIAGRAM
DUMMY BIT R/W AMPS INSTRUCTION DECODE, CONTROL, AND CLOCK GENERATION ADDRESS REGISTER ADDRESS DECODER EEPROM ARRAY 256/512x8 128/256x16
DATA REGISTER DIN INSTRUCTION REGISTER
DOUT
CS
SK
WRITE ENABLE
HIGH VOLTAGE GENERATOR
Copyright © 2006 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 DataSheet4U.com 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 — 1-800-379-4774
Rev. A 05/02/06
1
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IS93C56A
IS93C66A
ISSI
8-Pin JEDEC SOIC “GR”
®
PIN CONFIGURATIONS
8-Pin DIP, 8-Pin TSSOP
CS SK DIN DOUT 1 2 3 4 8 7 6 5 VCC NC ORG GND
CS SK DIN DOUT
1 2 3 4
8 7 6 5
VCC NC ORG GND
PIN DESCRIPTIONS
CS SK DIN DOUT NC Vcc GND Chip Select Serial Data Clock Serial Data Input Serial Data Output Organization Select Not Connected Power Ground
et4U.com ORG
instruction begins with a start bit of the logical “1” or HIGH. Following this are the opcode (2 bits), address field (8 or 9 bits), and data, if appropriate. The clock signal may be held stable at any moment to suspend the device at its last state, allowing clockspeed flexibility. Upon completion of bus communication, CS would be pulled LOW. The device then would enter Standby mode if no internal programming is underway. DataSheet4U.com Read (READ) The READ instruction is the only instruction that outputs serial data on the DOUT pin. After the read instruction and address have been decoded, data is transferred from the selected memory register into a serial shift register. (Please note that one logical “0” bit precedes the actual 8 or 16-bit output data string.) The output on DOUT changes during the low-to-high transitions of SK (see Figure 3).
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Applications
The IS93C56A/66A are very popular in many applications which require low-power, low-density storage. Applications using these devices include industrial controls, networking, and numerous other consumer electronics.
Low Voltage Read
The IS93C56A/66A are designed to ensure that data read operations are reliable in low voltage environments. They provide accurate operation with Vcc as low as 1.8V.
Endurance and Data Retention
The IS93C56A/66A are designed for applications requiring up to 1M programming cycles (WRITE, WRALL, ERASE and ERAL). They provide 40 years of secure data retention without power after the execution of 1M programming cycles.
Auto Increment Read Operations
In the interest of memory transfer operation applicatio.