A
PPLICATION
N
OTE
A V A I L A B L E
X25080
8K
AN61
X25080
SPI Serial E
2
PROM With Block Lock
TM
Protection
DESCRIPTION
1K x 8 Bit
FEATURES
• 2MHz Clock Rate
• SPI Modes (0,0 & 1,1)
• 1K X 8 Bits
— 32 Byte Page Mode
• Low Power CMOS
— <1
µ
A Standby Current
— <5mA Active Current
• 2.7V To 5.5V Power Supply
• Block Lock Protection
— Protect 1/4, 1/2 or all of E
2
PROM 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
• 8-Lead SOIC Package
• 14-Lead TSSOP Package
FUNCTIONAL DIAGRAM
STATUS
REGISTER
WRITE
PROTECT
LOGIC
The X25080 is a CMOS 8192-bit serial E
2
PROM,
internally organized as 1K x 8. The X25080 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 X25080 also features two additional inputs that
provide the end user with added flexibility. By asserting
the
HOLD
input, the X25080 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 X25080 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 X25080 utilizes Xicor’s proprietary Direct Write™
cell, providing a minimum endurance of 100,000 cycles
and a minimum data retention of 100 years.
X DECODE
LOGIC
8
1K BYTE
ARRAY
8 X 256
SO
SI
SCK
CS
HOLD
COMMAND
DECODE
AND
CONTROL
LOGIC
8
8 X 256
16
16 X 256
WP
WRITE
CONTROL
AND
TIMING
LOGIC
32
8
Y DECODE
DATA REGISTER
3090 ILL F01
Direct Write™ and Block Lock™ Protection is a trademark of Xicor, Inc.
©Xicor, Inc. 1994, 1995, 1996 Patents Pending
3090-1.7 6/11/96 T3/C1/D0 NS
1
Characteristics subject to change without notice
XICOR [ XICOR INC. ]
