AT25320B Datasheet, PDF (1/23 Pages) ATMEL Corporation – SPI Serial EEPROMs 32K (4096 x 8) 64K (8192 x 8)

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
– 1.8 (V_CC = 1.8V to 5.5V)
• 20 MHz 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 (5 ms max)
• High Reliability
– Endurance: One Million Write Cycles
– Data Retention: 100 Years
• Automotive Devices Available
• 8-lead JEDEC PDIP, 8-lead JEDEC SOIC, 8-lead Ultra Thin Mini-MAP (MLP 2x3), 8-lead
TSSOP and 8-lead Ultra Lead Frame Land Grid Array (ULA) Packages
• Die Sales: Wafer Form, Tape and Reel, and Bumped Wafers
Description
The AT25320B/640B provides 32768/65536 bits of serial electrically-erasable pro-
grammable 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 PDIP, 8-lead JEDEC SOIC, 8-lead Ultra Thin Mini-
MAP (MLP 2x3), 8-lead Ultra Lead Frame Land Grid Array (ULA) and 8-lead TSSOP
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 sepa-
rate erase cycle is required before write.
Table 0-1. Pin Configuration
8-lead PDIP
Pin Name
CS
SCK
SI
Function
Chip Select
Serial Data Clock
Serial Data Input
CS 1
SO 2
WP 3
GND 4
8 VCC
7 HOLD
6 SCK
5 SI
SO
Serial Data Output
GND
VCC
Ground
Power Supply
8-lead TSSOP
WP
HOLD
Write Protect
Suspends Serial Input
CS 1
SO 2
WP 3
GND 4
8 VCC
7 HOLD
6 SCK
5 SI
SPI Serial
EEPROMs
32K (4096 x 8)
64K (8192 x 8)
AT25320B
AT25640B
Advance
Information
8535B–SEEPR–7/08