64K
X25650
5MHz SPI Serial E
2
PROM with Block Lock
TM
Protection
8K x 8 Bit
FEATURES
DESCRIPTION
The X25650 is a CMOS 65,536-bit serial E
2
PROM,
internally organized as 8K x 8. The X25650 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
controlled through a chip select (CS) input, allowing
any number of devices to share the same bus.
The X25650 also features two additional inputs that
provide the end user with added flexibility. By
asserting the HOLD input, the X25650 will ignore tran-
sitions on its inputs, thus allowing the host to service
higher priority interrupts. The WP input can be used as
a hardwire input to the X25650 disabling all write
attempts to the status register, thus providing a mech-
anism for limiting end user capability of altering 0, 1/4,
1/2 or all of the memory.
The X25650 utilizes Xicor’s proprietary Direct Write
TM
cell, providing a minimum endurance of 100,000
cycles and a minimum data retention of 100 years.
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5MHz Clock Rate
Low Power CMOS
<1
µ
A Standby Current
<5mA Active Current
2.5V To 5.5V 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 E
2
PROM Array
Programmable Hardware Write Protection
In-Circuit Programmable ROM Mode
Built-in Inadvertent Write Protection
Power-Up/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
Packages
8-Lead SOIC
20-Lead TSSOP
FUNCTIONAL DIAGRAM
ST
ATUS
REGISTER
WRITE
PROTECT
LOGIC
X DECODE
LOGIC
64
64 X 256
SO
SI
SCK
CS
HOLD
COMMAND
DECODE
AND
CONTROL
LOGIC
64
64 X 256
8K BYTE
ARRAY
128
128 X 256
WP
WRITE
CONTROL
AND
TIMING
LOGIC
32
8
Y DECODE
DATA REGISTER
7037 FRM F01
Direct Write™ and Block Lock™ Protection is a trademark of Xicor, Inc.
©
Xicor, Inc. 1994, 1995, 1996 Patents Pending
7037–1.5 6/19/97 T1/C0/D0 SH
1
Characteristics subject to change without notice
XICOR [ XICOR INC. ]
