X25138 Datasheet, PDF (1/18 Pages) Xicor Inc. – 5MHz SPI Serial E2PROM with Block Lock PROTECTION

128K
X25138
16K x 8 Bit
5MHz SPI Serial E²PROM with Block Lock^TM Protection
FEATURES
• 5MHz Clock Rate
• Low Power CMOS
<1mA Standby Current
<5mA Active Current
• 2.5V To 5.5V Power Supply
• SPI Modes (0,0 & 1,1)
• 16K X 8 Bits
32 Byte Page Mode
• Block Lock™ Protection
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
Endurance: 100,000 cycles
Data Retention: 100 Years
ESD protection: 2000V on all pins
• Packages
8-Lead XBGA
8, 14-Lead SOIC
8-Lead PDIP
8-Lead TSSOP
FUNCTIONAL DIAGRAM
STATUS
REGISTER
WRITE
PROTECT
LOGIC
SO
SI
SCK
CS
HOLD
COMMAND
DECODE
AND
CONTROL
LOGIC
DESCRIPTION
The X25138 is a CMOS 128K-bit serial E²PROM,
internally organized as 16K x 8. The X25138 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 X25138 also features two additional inputs that
provide the end user with added flexibility. By
asserting the HOLD input, the X25138 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 X25138 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 X25138 utilizes Xicor’s proprietary Direct Write^TM
cell, providing a minimum endurance of 100,000
cycles and a minimum data retention of 100 years.
X DECODE
LOGIC
128
16K BYTE
ARRAY
128 X 256
128
128 X 256
256
256 X 256
WRITE
CONTROL
AND
WP
TIMING
LOGIC
Direct WriteÔ and Block LockÔ Protection is a trademark of Xicor, Inc.
ÓXicor, Inc. 1998 Patents Pending
1
7056–1.5 8/13/98 T2/C0/D1 EW
32
8
Y DECODE
DATA REGISTER
7037 FRM F01
Characteristics subject to change without notice