AT93C56B/AT93C66B Three-Wire Automotive Temperature Serial EEPROM 2- Kbit (256 x 8 or 128 x 16) and 4-Kbit (512 x 8 or 256 x 16) Features Medium-Voltage and Standard-Voltage Operations: V = 2.5V to 5.5V CC User-Selectable Internal Organization: 2K: 256 x 8 or 128 x 16 4K: 512 x 8 or 256 x 16 Automotive Temperature Range: -40C to +125C Three-Wire Serial Interface Sequential Read Operation 2 MHz Clock Rate (5V) Self-Timed Write Cycle within 5 ms Maximum Automotive AEC-Q100 Qualified High Reliability: Endurance: 1,000,000 write cycles Data retention: 100 years Green Package Options (Lead-free/Halide-free/RoHS compliant) Packages 8-Lead SOIC and 8-Lead TSSOP DS20006278A-page 1 2019 Microchip Technology Inc. AT93C56B/AT93C66B Table of Contents Features......................................................................................................................................................... 1 Packages........................................................................................................................................................1 1. Package Types (not to scale)..................................................................................................................4 2. Pin Descriptions...................................................................................................................................... 5 2.1. Chip Select (CS)...........................................................................................................................5 2.2. Serial Data Clock (SK)................................................................................................................. 5 2.3. Serial Data Input (DI)....................................................................................................................5 2.4. Serial Data Output (DO)...............................................................................................................5 2.5. Ground (GND)..............................................................................................................................5 2.6. Internal Organization (ORG)........................................................................................................ 5 2.7. Device Power Supply (V )......................................................................................................... 6 CC 3. Description.............................................................................................................................................. 7 3.1. Block Diagram..............................................................................................................................7 4. Electrical Characteristics.........................................................................................................................8 4.1. Absolute Maximum Ratings..........................................................................................................8 4.2. DC and AC Operating Range.......................................................................................................8 4.3. DC Characteristics....................................................................................................................... 8 4.4. AC Characteristics........................................................................................................................9 4.5. Synchronous Data Timing.......................................................................................................... 10 4.6. Electrical Specifications..............................................................................................................10 5. Device Commands and Addressing......................................................................................................12 5.1. READ......................................................................................................................................... 12 5.2. Erase/Write Enable (EWEN)...................................................................................................... 13 5.3. Erase/Write Disable (EWDS)..................................................................................................... 13 5.4. ERASE....................................................................................................................................... 14 5.5. WRITE........................................................................................................................................14 5.6. Write All (WRAL)........................................................................................................................ 15 5.7. Erase All (ERAL)........................................................................................................................ 15 6. Packaging Information.......................................................................................................................... 17 6.1. Package Marking Information.....................................................................................................17 7. Revision History.................................................................................................................................... 23 The Microchip Website.................................................................................................................................24 Product Change Notification Service............................................................................................................24 Customer Support........................................................................................................................................ 24 Product Identification System.......................................................................................................................25 Microchip Devices Code Protection Feature................................................................................................25 DS20006278A-page 2 2019 Microchip Technology Inc.