TM
ICmic
256 x 8 Bit
This X25020 device has been acquired by
IC MICROSYSTEMS from Xicor, Inc.
IC MICROSYSTEMS
2K
X25020
SPI Serial E2PROM with Block LockTM Protection
FEATURES
DESCRIPTION
The X25020 is a CMOS 2048-bit serial E2PROM, internally
organized as 256 x 8. The X25020 features a serial
•1MHz Clock Rate
•SPI Modes (0,0 & 1,1)
•256 X 8 Bits
—4 Byte Page Mode
interface 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 controlled through a chip select
•Low Power CMOS
—10µA Standby Current
—3mA Active Write Current
•2.7V To 5.5V Power Supply
(CS) input, allowing any number of devices to share the
same bus.
•Block Lock Protection
—Protect 1/4, 1/2 or all of E2PROM Array
•Built-in Inadvertent Write Protection
The X25020 also features two additional inputs that
provide the end user with added flexibility. By asserting
the HOLD input, the X25020 will ignore transitions on its
inputs, thus allowing the host to service higher priority
—Power-Up/Power-Down protection circuitry
—Write Latch
interrupts. The WP input can be used as a hardwire input to
the X25020 disabling all write attempts, thus providing a
mechanism for limiting end user capability of altering the
memory.
—Write Protect Pin
•Self-Timed Write Cycle
—5ms Write Cycle Time (Typical)
•High Reliability
—Endurance: 100,000 cycles per byte
—Data Retention: 100 Years
The X25020 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
256 BYTE
ARRAY
16
16
32
16 X 32
16 X 32
32 X 32
SO
SI
SCK
COMMAND
DECODE
AND
CONTROL
LOGIC
CS
HOLD
WRITE
CONTROL
AND
TIMING
LOGIC
WP
4
8
Y DECODE
DATA REGISTER
3834 FHD F01
™ ™
Direct Write and Block Lock Protection is a trademark of Xicor, Inc.
©Xicor, Inc. 1994, 1995, 1996 Patents Pending
3834-1.8 6/10/96 T3/C1/D0 NS
Characteristics subject to change without notice
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