Description:
The Atmel® AT25320B/640B provides 32,768-/65,536-bits of Serial Electrically-Erasable Programmable Read-Only Memory (EEPROM) organized as 4,096/8,192 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 TSSOP, 8-lead UDFN, 8-lead XDFN, and 8-ball VFBGA packages.
The AT25320B/640B is enabled through the Chip Select pin (CS) and accessed via a 3-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.
Standard Features
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
̶ 1.8V (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: 1,000,000 Write Cycles
̶ Data Retention: 100 Years
Green (Pb/Halide-free/RoHS Compliant) Packaging Options
Die Sales: Wafer Form, Tape and Reel, and Bumped Wafers
The AT25320B/640B is designed to interface directly with the synchronous Serial Peripheral Interface (SPI) of the 6805 and 68HC11 series of microcontrollers. The AT25320B/640B utilizes an 8-bit instruction register. The list of instructions and their operation codes are contained in Table 6-1. All instructions, addresses, and data are transferred with the MSB first and start with a high-to-low CS transition.
Applications
Computers & Computer Peripherals, Industrial, Commercial
ATFU Excess Inventory of ATMEL/MICROCHIP Series Memory chip:
AT24C02C AT24C02D
AT24C04C
AT24C08C
AT24C16C
AT24C64D
AT24C128C
AT24C256C
AT24C512C
AT93C66B
