TM
ICmic
512 x 8 Bit
This X25040 device has been acquired by
IC MICROSYSTEMS from Xicor, Inc.
IC MICROSYSTEMS
4K
X25040
SPI Serial E2PROM with Block LockTM Protection
FEATURES
DESCRIPTION
The X25040 is a CMOS 4096-bit serial E2PROM, internally
organized as 512 x 8. The X25040 features a Serial
•1MHz Clock Rate
•SPI Modes (0,0 & 1,1)
•512 X 8 Bits
—4 Byte Page Mode
Peripheral Interface (SPI) and software protocol allowing
operation on a simple three-wire bus. The bus
•Low Power CMOS
—150µA Standby Current
—3mA Active Current
signals are a clock input (SCK) plus separate data in (SI) and
data out (SO) lines. Access to the device is controlled
through a chip select (CS) input, allowing any number of
devices to share the same bus.
•2.7V To 5.5V Power Supply
•Block Lock Protection
The X25040 also features two additional inputs that
provide the end user with added flexibility. By asserting
—Protect 1/4, 1/2 or all of E2PROM Array
•Built-in Inadvertent Write Protection
—Power-Up/Power-Down protection circuitry
—Write Latch
the HOLD input, the X25040 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 X25040 disabling all write attempts, thus providing
—Write Protect Pin
a mechanism for limiting end user capability of altering the
memory.
•Self-Timed Write Cycle
—5ms Write Cycle Time (Typical)
•High Reliability
—Endurance: 100,000 cycles per byte
—Data Retention: 100 Years
The X25040 utilizes Xicor’s proprietary Direct Write™ cell,
providing a minimum endurance of 100,000 cycles
per byte and a minimum data retention of 100 years.
—ESD protection: 2000V on all pins
•8-Lead PDlP Package
•8-Lead SOIC Package
FUNCTIONAL DIAGRAM
WRITE
PROTECT
LOGIC
STATUS
REGISTER
X DECODE
LOGIC
512 BYTE
ARRAY
32
32
64
32 X 32
32 X 32
64 X 32
SO
SI
COMMAND
DECODE
SCK
AND
CONTROL
LOGIC
CS
HOLD
WRITE
CONTROL
AND
TIMING
LOGIC
WP
4
8
Y DECODE
DATA REGISTER
6451 FHD F01
Direct Write™ and Block Lock™ Protection is a trademark of Xicor, Inc.
©Xicor, Inc. 1994, 1995, 1996 Patents Pending
6451-3.6 6/10/96 T5/C1/D0 NS
Characteristics subject to change without notice
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