ICmic
TM
This X25020 device has been acquired by
IC MICROSYSTEMS from Xicor, Inc.
IC MICROSYSTEMS
2K
2
X25020
SPI Serial E PROM with Block Lock
TM
256 x 8 Bit
Protection
2
FEATURES
DESCRIPTION
The X25020 is a CMOS 2048-bit serial E PROM, internally
organized as 256 x 8. The X25020 features a serial
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
(CS) input, allowing any number of devices to share the
same bus.
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
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.
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.
•
1MHz Clock Rate
•
SPI Modes (0,0 & 1,1)
•
256 X 8 Bits
—4 Byte Page Mode
•
Low Power CMOS
—10
µ
A Standby Current
—3mA Active Write Current
•
2.7V To 5.5V Power Supply
•
Block Lock Protection
2
—Protect 1/4, 1/2 or all of E PROM Array
•
Built-in Inadvertent Write Protection
—Power-Up/Power-Down protection circuitry
—Write Latch
—Write Protect Pin
•
Self-Timed Write Cycle
—5ms Write Cycle Time (Typical)
•
High Reliability
—Endurance: 100,000 cycles per byte
—Data Retention: 100 Years
•
8-Lead PDlP Package
•
8-Lead SOIC Package
—ESD protection: 2000V on all pins
FUNCTIONAL DIAGRAM
STATUS
REGISTER
WRITE
PROTECT
LOGIC
X DECODE
LOGIC
256 BYTE
ARRAY
16
SO
SI
SCK
CS
16 X 32
COMMAND
DECODE
HOLD
AND
CONTROL
LOGIC
16
16 X 32
32
32 X 32
WP
WRITE
CONTROL
AND
TIMING
LOGIC
4
8
Y DECODE
DATA REGISTER
Direct Write
™
and Block Lock
™
Protection is a trademark of Xicor, Inc.
3834 FHD F01
Characteristics subject to change without notice
©Xicor, Inc. 1994, 1995, 1996 Patents Pending
3834-1.8 6/10/96 T3/C1/D0 NS
1
ICMIC [ IC MICROSYSTEMS ]
