X88257 Datasheet PDF - Xicor
| Part Number | X88257 | |
| Description | E2 Micro-Peripheral | |
| Manufacturers | Xicor | |
| Logo |  |
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There is a preview and X88257 download ( pdf file ) link at the bottom of this page. Total 15 Pages | ||
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8X0858125M7icrocontroller Family Compatible
256K
X88257
32,768 x 8 Bit
E2 Micro-Peripheral
FEATURES
• Multiplexed Address/Data Bus
—Direct Interface to Popular 8051 Family
• High Performance CMOS
—Fast Access Time, 120ns
—Low Power
—60mA Active Maximum
—500µA Standby Maximum
• Software Data Protection
• Toggle Bit Polling
—Early End of Write Detection
• Page Mode Write
—Allows up to 128 Bytes to be Written in
One Write Cycle
• High Reliability
—Endurance: 10,000 Write Cycle
—Data Retention: 100 Years
• 28-Lead PDIP Package
• 28-Lead SOIC Package
• 32-Lead PLCC Package
DESCRIPTION
The X88257 is an 32K x 8 E2PROM fabricated with
advanced CMOS Textured Poly Floating Gate Technol-
ogy. The X88257 features a multiplexed address and
data bus allowing direct interface to a variety of popular
single-chip microcontrollers operating in expanded mul-
tiplexed mode without the need for additional interface
circuitry.
FUNCTIONAL DIAGRAM
CE, CE
WR
RD
PSEN
A8–A14
ALE
CONTROL
LOGIC
LX
AD
TE
CC
HO
ED
SE
SOFTWARE
DATA
PROTECT
32K x 8
E2PROM
Y DECODE
I/O & ADDRESS LATCHES AND BUFFERS
A/D0–A/D7
6509 ILL F02.1
© Xicor, Inc. 1994-1997 Patents Pending
6509-1.9 4/9/96 T2/C5/D8 NS
1 Characteristics subject to change without notice
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X88257
TOGGLE BIT POLLING
Because the typical write timing is less than the specified
5ms, Toggle Bit Polling has been provided to determine
the early end of write. During the internal programming
cycle I/O6 will toggle from “1” to “0” and “0” to “1” on
Toggle Bit Polling RD/WR Control
subsequent attempts to read the device. When the
internal cycle is complete the toggling will cease and the
device will be accessible for additional read or write
operations.
OPERATION
LAST BYTE
WRITTEN
CE
I/O6=X
I/O6=X
I/O6=X
I/O6=X
X88C64 READY FOR
NEXT OPERATION
ALE
A/D0–A/D7
AIN DIN
AIN DOUT
AIN DOUT
AIN DOUT
AIN DOUT
AIN
A8–A14
An
An
An
An
An ADDR
WR
RD
SOFTWARE DATA PROTECTION
Software Data Protection (SDP) is employed to protect
the entire array against inadvertent writes. To write to the
X88257, a three-byte command sequence must precede
the byte(s) being written. All write operations, both the
command sequence and any data write operations must
conform to the page write timing requirements.
Writing with SDP
WRITE AA
TO 5555
WRITE 55
TO 2AAA
6509 ILL F09.1
WRITE A0
TO 5555
PERFORM BYTE
OR PAGE WRITE
OPERATIONS
WAIT tWC
EXIT ROUTINE
6509 ILL F10.1
5
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Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for X88257 electronic component. |
| Information | Total 15 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ X88257.PDF Datasheet ] | |
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