The Atmel high speed 64 Kbit SPI bus serial EEPROM supports SPI modes 0 and 3 operation. The EEPROM is organized as 8192 words x 8 bits and optimized for industrial and commercial applications where low-power and low-voltage operations are essential.The EEPROM is available in a variety of space-saving packaging options at 1.8 (VCC = 1.8V to 5.5V). The three-wire serial interface consists of a data input, output, and a shift clock. All programming cycles are completely self-timed, and no separate erase cycle is required before write. Block write protection is program enabled and separate program enable and disable instructions are provided for additional data protection. Hardware data protection provided to protect against inadvertent write attempts to the status register. Any serial communication suspension can be accomplished without resetting the serial sequence.
Feature
• Serial Peripheral Interface (SPI) Compatible
• Supports SPI Modes 0 (0,0) and 3 (1,1)
– Datasheet Describes Mode 0 Operation
• Low-voltage and Standard-voltage Operation
– 1.8 (VCC = 1.8V to 5.5V)
• 20MHz Clock Rate (5V)
• 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 (5ms max)
• High Reliability
– Endurance: One Million Write Cycles
– Data Retention: 100 Years
• Green (Pb/Halide-free/RoHS Compliant) Packaging Options
• Die Sales: Wafer Form, Tape and Reel, and Bumped Wafers
Description
The Atmel® AT25320B/640B 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 AT25320B/640B is available in space-saving 8-lead JEDEC SOIC, 8-lead UDFN, 8-lead XDFN, 8-lead TSSOP, and 8-ball VFBGA packages.
The AT25320B/640B is enabled through the Chip Select pin (CS) and accessed via a three-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.
(Picture: Pinout)
