Rainbow Electronics AT25F1024 - Manual

1
Features
• Serial Peripheral Interface (SPI) Compatible
• Supports SPI Modes 0 (0,0) and 3 (1,1)
• 20 MHz Clock Rate
• Byte Mode and 256-byte Page Mode for Program Operations
• Sector Architecture:
– Two Sectors with 32K Bytes Each (512K)
– Four Sectors with 32K Bytes Each (1M)
– 128 Pages per Sector
• Product Identification Mode
• Low-voltage Operation
– 2.7 (V
CC
= 2.7V to 3.6V)
• Sector Write Protection
• Write Protect (WP) Pin and Write Disable Instructions for
both Hardware and Software Data Protection
• Self-timed Program Cycle (60 µs/Byte Typical)
• Self-timed Sector Erase Cycle (1 second/Sector Typical)
• Single Cycle Reprogramming (Erase and Program) for Status Register
• High Reliability
– Endurance: 10,000 Write Cycles Typical
• Lead-free Devices Available
• 8-lead JEDEC SOIC and 8-lead SAP Packages
Description
The AT25F512/1024 provides 524,288/1,048,576 bits of serial reprogrammable Flash
memory organized as 65,536/131,072 words of 8 bits each. The device is optimized
for use in many industrial and commercial applications where low-power and low-volt-
age operation are essential. The AT25F512/1024 is available in a space-saving 8-lead
JEDEC SOIC and 8-lead SAP packages.
The AT25F512/1024 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 write cycles are completely self-timed.
BLOCK WRITE protection for top 1/4, top 1/2 or the entire memory array (1M) or
entire memory array (512K) is enabled by programming the status register. Separate
write enable and write 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.
Rev. 1440P–SEEPR–6/04
SPI Serial
Memory
512K (65,536 x 8)
1M (131,072 x 8)
AT25F512
AT25F1024
Pin Configurations
Pin Name Function
CS Chip Select
SCK Serial Data Clock
SI Serial Data Input
SO Serial Data Output
GND Ground
VCC Power Supply
WP Write Protect
HOLD Suspends Serial Input
8-lead SOIC
1
2
3
4
8
7
6
5
CS
SO
WP
GND
VCC
HOLD
SCK
SI
8-lead SAP
Bottom View
1
2
3
4
8
7
6
5
VCC
HOLD
SCK
SI
CS
SO
WP
GND