AT25320B_10 Datasheet, PDF (1/26 Pages) ATMEL Corporation – serial electrically-erasable programmable read-only memory

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)
• 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 sepa-
rate erase cycle is required before write.
Table 0-1.
Pin Name
CS
SCK
SI
Pin Configuration
Function
Chip Select
Serial Data Clock
Serial Data Input
8-lead SOIC
CS 1
SO 2
WP 3
GND 4
8
VCC
7 HOLD
6 SCK
5 SI
8-lead TSSOP
CS 1
SO 2
WP 3
GND 4
8 V_CC
7 HOLD
6 SCK
5 SI
SO
Serial Data Output
8-lead UDFN
8-lead XDFN
GND
VCC
WP
Ground
Power Supply
Write Protect
VCC 8
HOLD 7
SCK 6
SI 5
1 CS
2 SO
3 WP
4 GND
VCC 8
HOLD 7
SCK 6
SI 5
1 CS
2 SO
3 WP
4 GND
HOLD
Suspends Serial Input
Bottom View
Bottom View
8-ball VFBGA
VCC 8
HOLD 7
SCK 6
SI 5
1 CS
2 SO
3 WP
4 GND
Bottom View
SPI Serial
EEPROMs
32K (4096 x 8)
64K (8192 x 8)
Atmel
AT25320B
AT25640B
8535F–SEEPR–6/10