Features
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Serial Peripheral Interface (SPI) Compatible
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Supports SPI Modes 0 (0,0) and 3 (1,1)
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– 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
SPI Serial
EEPROMs
32K (4096 x 8)
64K (8192 x 8)
Atmel
AT25320B
AT25640B
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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
SO
GND
VCC
WP
HOLD
Pin Configuration
Function
Chip Select
Serial Data Clock
Serial Data Input
Serial Data Output
Ground
Power Supply
Write Protect
Suspends Serial Input
CS
SO
WP
GND
8-lead SOIC
1
2
3
4
8
7
6
5
8-lead TSSOP
V
CC
HOLD
SCK
SI
CS
SO
WP
GND
1
2
3
4
8
7
6
5
V
CC
HOLD
SCK
SI
8-lead UDFN
V
CC
8
HOLD
7
SCK
6
SI
5
1
CS
2
SO
3
WP
4
GND
8-lead XDFN
V
CC
8
HOLD
7
SCK
6
SI
5
1
CS
2
SO
3
WP
4
GND
Bottom View
8-ball VFBGA
V
CC
8
HOLD
7
SCK
6
SI
5
1
2
3
4
Bottom View
CS
SO
WP
GND
8535F–SEEPR–6/10
Bottom View
ATMEL [ ATMEL CORPORATION ]
