APPLICATION NOTE
A V A I LABLE
AN76 • AN78 • AN81 • AN87
64K/32K/16K
X24F064/032/016
8K/4K/2K x 8 Bit
SerialFlash™ Memory with Block Lock™ Protection
FEATURES
• 1.8V to 3.6V or 5V “Univolt” Read and Program
Power Supply Versions
• Low Power CMOS
—Active read current less than 1mA
—Active program current less than 3mA
—Standby current less than 1µA
• Internally Organized 8K/4K/2K x 8
• New Programmable Block Lock Protection
—Software write protection
—Programmable hardware write protect
• Block Lock (0, 1/4, 1/2, or all of the Flash Memory
Array)
• 2 Wire Serial Interface
• Bidirectional Data Transfer Protocol
• 32 Byte Sector Programming
• Self Timed Program Cycle
—Typical programming time of 5ms per sector
• High Reliability
—Endurance: 100,000 cycles per byte
—Data retention: 100 years
• Available Packages
—8-lead PDIP
—8-lead SOIC (JEDEC)
—14-lead TSSOP (X24F032/016)
—20-lead TSSOP (X24F064)
DESCRIPTION
The X24F064/032/016 is a CMOS SerialFlash Memory
Family, internally organized 8K/4K/2K x 8. The family
features a serial interface and software protocol allow-
ing operation on a simple two wire bus.
Device select inputs (S0, S1, S2) allow up to eight
devices to share a common two wire bus.
A Program Protect Register accessed at the highest
address location, provides three new programming pro-
tection features: Software Programming Protection, Block
Lock Protection, and Hardware Programming Protection.
The Software Programming Protection feature prevents
any nonvolatile writes to the device until the WEL bit in
the program protect register is set. The Block LockTM Pro-
tection feature allows the user to individually protect four
blocks of the array by programming two bits in the pro-
gramming protect register. The Programmable Hardware
Program Protect feature allows the user to install each
device with PP tied to VCC, program the entire memory
array in place, and then enable the hardware program-
ming protection by programming a PPEN bit in the pro-
gram protect register. After this, selected blocks of the
array, including the program protect register itself, are
permanently protected from being programmed.
Xicor SerialFlash Memories are designed and tested for
applications requiring extended endurance. Inherent
data retention is greater than 100 years.
BLOCK DIAGRAM
SDA
Data Register
Sector Decode Logic
SCL
S0/S0
S1/S1
S2/S2
Command
Decode
and
Control Logic
X
Decode
Logic
Program
Protect
Register
32 8
Sectored
Memory
Array
PP
SerialFlash™ Memory and Block Lock™
Protection are trademarks of Xicor, Inc.
©Xicor, Inc. 2000 Patents Pending
6686-3.8 10/27/00 EP
Programming Control Logic
High Voltage
Control
Characteristics subject to change without notice. 1 of 17
