AT25320B and AT25640B SPI Serial EEPROM 32Kb (4096 x 8) and 64Kb (8192 x 8) DATASHEET 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 (V = 1.8V to 5.5V) CC 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 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. 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. Atmel-8535H-SEEPROM-AT25320B-640B-Datasheet 0120151. Pin Configurations and Pinouts Table 1-1. Pin Configurations 8-lead SOIC 8-lead TSSOP Pin Name Function CS V 1 8 CC 1 CS 8 V CC SO HOLD CS Chip Select 2 7 SO 2 7 HOLD WP 3 6 SCK WP SCK 3 6 GND 4 5 SI SCK Serial Data Clock GND 4 5 SI Top View Top View SI Serial Data Input SO Serial Data Output 8-pad UDFN 8-pad XDFN GND Ground V 8 1 CS V 8 1 CS CC CC V Power Supply 7 2 7 2 CC HOLD SO HOLD SO SCK 6 3 SCK 6 3 WP WP WP Write Protect SI 5 4 GND SI 5 4 GND HOLD Suspends Serial Input Bottom View Bottom View 8-ball VFBGA V 8 1 CS CC HOLD 7 2 SO SCK 6 3 WP SI 5 4 GND Bottom View Note: Drawings are not to scale. 2. Absolute Maximum Ratings* *Notice: Stresses beyond those listed under Absolute Operating Temperature . -55C to +125 C Maximum Ratings may cause permanent Storage Temperature . -65C to +150 C damage to the device. This is a stress rating only and functional operation of the device at Voltage on Any Pin these or any other conditions beyond those with Respect to Ground .-1.0V to +7.0V indicated in the operational sections of this specification is not implied. Exposure to Maximum Operating Voltage . 6.25V absolute maximum rating conditions for DC Output Current . 5.0mA extended periods may affect device reliability. 2 AT25320B/640B DATASHEET Atmel-8535H-SEEPROM-AT25320B-640B-Datasheet 012015