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| AT25320/640 Features * * * * * * * * * * * Serial Peripheral Interface (SPI) Compatible Supports SPI Modes 0 and 3 Low Voltage and Standard Voltage Operation 5.0 (VCC = 4.5V to 5.5V) 2.7 (VCC = 2.7V to 5.5V) 1.8 (VCC = 1.8V to 3.6V) 2 MHz Clock Rate 32-Byte Page Mode Block Write Protection Protect 1/4, 1/2, or Entire Array Write Protect (WP) Pin and Write Disable Instructions for Both Hardware and Software Data Protection Self-Timed Write Cycle (10 ms Max) High Reliability Endurance: 1 Million Cycles Data Retention: 100 Years Automotive Grade and Extended Temperature Devices Available 8-Pin PDIP and JEDEC SOIC Packages SPI Serial CMOS E2PROMs 32K (4096 x 8) 64K (8192 x 8) Description The AT25320/640 provides 32768/65536 bits of serial electrically erasable programmable read only memory (EEPROM) organized as 4096/8192 words of 8 bits each. The device is optimized for use in many industrial and commercial applications where low power and low voltage operation are essential. The AT25320/640 is available in space saving 8-pin PDIP and 8-pin JEDEC (SOIC) packages. The AT25320/640 is enabled through the Chip Select pin (CS) and accessed via a 4-wire interface consisting of Serial Data Input (SI), Serial Data Output (SO), and Serial Clock (SCK). All programming cycles are completely self-timed, and no separate ERASE cycle is required before WRITE. (continued) Advance Information 8-Pin PDIP Pin Configurations Pin Name CS SCK SI SO GND VCC WP HOLD Function Chip Select Serial Data Clock Serial Data Input Serial Data Output Ground Power Supply Write Protect Suspends Serial Input AT25320/640 8-Pin SOIC 0639A 2-115 Description (Continued) BLOCK WRITE protection is enabled by programming the status register with one of four blocks of write protection. Separate program enable and program disable instructions are provided for additional data protection. Hardware data protection is provided via the WP pin to protect against inadvertent write attempts to the status register. The HOLD pin may be used to suspend any serial communication without resetting the serial sequence. Absolute Maximum Ratings* Operating Temperature................... -55C to +125C Storage Temperature...................... -65C to +150C Voltage on Any Pin with Respect to Ground ..................... -1.0V to +7.0V Maximum Operating Voltage ........................... 6.25V DC Output Current ......................................... 5.0 mA *NOTICE: Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Block Diagram 2-116 AT25320/640 |
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