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X25640 Datasheet, PDF (1/14 Pages) Xicor Inc. – Advanced SPI Serial E2PROM With Block LockTM Protection
APPLICATION NOTES
AVA I L A B L E
X25640AN19 • AN38 • AN41 • AN61
64K
X25640
8K x 8 Bit
Advanced SPI Serial E2PROM With Block LockTM Protection
FEATURES
• 1MHz Clock Rate
• Low Power CMOS
—200µA Standby Current
—5mA Active Current
• 5 Volt Power Supply
• SPI Modes (0,0 & 1,1)
• 8K X 8 Bits
—32 Byte Page Mode
• Block Lock Protection
—Protect 1/4, 1/2 or all of E2PROM Array
• Built-in Inadvertent Write Protection
—Power-Up/Power-Down protection circuitry
—Write Enable Latch
—Write Protect Pin
• Self-Timed Write Cycle
—5ms Write Cycle Time (Typical)
• High Reliability
—Endurance: 100,000 cycles
—Data Retention: 100 Years
—ESD protection: 2000V on all pins
• 8-Lead PDlP Package
• 14-Lead SOIC Package
DESCRIPTION
The X25640 is a CMOS 65,536-bit serial E2PROM,
internally organized as 8K x 8. The X25640 features a
Serial Peripheral Interface (SPI) and software protocol
allowing operation on a simple three-wire bus. The bus
signals are a clock input (SCK) plus separate data in (SI)
and data out (SO) lines. Access to the device is con-
trolled through a chip select (CS) input, allowing any
number of devices to share the same bus.
The X25640 also features two additional inputs that
provide the end user with added flexibility. By asserting
the HOLD input, the X25640 will ignore transitions on its
inputs, thus allowing the host to service higher priority
interrupts. The WP input can be used as a hardwire input
to the X25640 disabling all write attempts to the status
register, thus providing a mechanism for limiting end
user capability of altering 0, 1/4, 1/2 or all of the memory.
The X25640 utilizes Xicor’s proprietary Direct Write™
cell, providing a minimum endurance of 100,000 cycles
and a minimum data retention of 100 years.
FUNCTIONAL DIAGRAM
SO
SI
SCK
CS
HOLD
STATUS
REGISTER
COMMAND
DECODE
AND
CONTROL
LOGIC
WRITE
PROTECT
LOGIC
X DECODE
LOGIC
64
64
128
8K BYTE
ARRAY
64 X 256
64 X 256
128 X 256
WRITE
CONTROL
AND
WP
TIMING
LOGIC
Direct Write™ and Block Lock™ Protection is a trademark of Xicor, Inc.
©Xicor, Inc. 1994, 1995, 1996 Patents Pending
3089-1.8 6/17/96 T4/C4/D1 NS
1
32
8
Y DECODE
DATA REGISTER
3089 ILL F01
Characteristics subject to change without notice