32K
4K x 8 Bit
X25330
2
TM
5MHz SPI Serial E PROM with Block Lock Protection
FEATURES
DESCRIPTION
• 5MHz Clock Rate
• Low Power CMOS
The X25330 is a CMOS 32K-bit serial E2PROM, inter-
nally organized as 4K x 8. The X25330 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.
<1µA Standby Current
<5mA Active Current
• 2.5V To 5.5V Power Supply
• SPI Modes (0,0 & 1,1)
• 4K X 8 Bits
32 Byte Page Mode
• Block Lock™ Protection
The X25330 also features two additional inputs that
provide the end user with added flexibility. By
asserting the HOLD input, the X25330 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 X25330 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.
Protect 1/4, 1/2 or all of E2PROM 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
The X25330 utilizes Xicor’s proprietary Direct WriteTM
cell, providing a minimum endurance of 100,000
cycles and a minimum data retention of 100 years.
Endurance: 100,000 cycles
Data Retention: 100 Years
ESD protection: 2000V on all pins
• Packages
8-Lead SOIC
14-Lead TSSOP
FUNCTIONAL DIAGRAM
WRITE
STATUS
PROTECT
REGISTER
LOGIC
X DECODE
LOGIC
4K BYTE
ARRAY
32
32
32 X 256
32 X 256
SO
COMMAND
DECODE
SI
SCK
CS
AND
CONTROL
LOGIC
HOLD
64
64 X 256
WRITE
CONTROL
AND
TIMING
LOGIC
WP
32
8
Y DECODE
DATA REGISTER
7037 FRM F01
Direct Write and Block Lock Protection is a trademark of Xicor, Inc.
Xicor, Inc. 1994 - 1997 Patents Pending
7048–1.0 6/18/97 T0/C0/D0 SH
1
Characteristics subject to change without notice