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X68257JM Schematic ( PDF Datasheet ) - Xicor

Teilenummer X68257JM
Beschreibung E2 Micro-Peripheral
Hersteller Xicor
Logo Xicor Logo 




Gesamt 14 Seiten
X68257JM Datasheet, Funktion
6X86X8X25M7icrocontroller Family Compatible
256K
X68257
32,768 x 8 Bit
E2 Micro-Peripheral
FEATURES
• Multiplexed Address/Data Bus
—Direct Interface to Popular 68HC11 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 X68257 is an 32K x 8 E2PROM fabricated with
advanced CMOS Textured Poly Floating Gate Technol-
ogy. The X68257 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
R/W
E
SEL
A8–A14
AS
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
6539 ILL F02.2
© Xicor, Inc. 1994, 1995, 1996 Patents Pending
6539-1.7 9/16/96 T0/C1/D2 SH
1
Characteristics subject to change without notice






X68257JM Datasheet, Funktion
X68257
Software Data Protection
Software Data Protection (SDP) is employed to protect
the entire array against inadvertent writes. To write to
the X68257, 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
SYMBOL TABLE
WAVEFORM INPUTS
OUTPUTS
Must be
steady
May change
from LOW
to HIGH
May change
from HIGH
to LOW
Don’t Care:
Changes
Allowed
N/A
Will be
steady
Will change
from LOW
to HIGH
Will change
from HIGH
to LOW
Changing:
State Not
Known
Center Line
is High
Impedance
WRITE 55
TO 2AAA
WRITE A0
TO 5555
PERFORM BYTE
OR PAGE WRITE
OPERATIONS
WAIT tWC
EXIT ROUTINE
6539 FHD F09.1
6

6 Page









X68257JM pdf, datenblatt
X68257
PACKAGING INFORMATION
28-LEAD PLASTIC SMALL OUTLINE GULL WING PACKAGE TYPE S
0.299 (7.59)
0.290 (7.37)
0.419 (10.64)
0.394 (10.01)
0.020 (0.508)
0.014 (0.356)
0° – 8°
0.105 (2.67)
0.092 (2.34)
0.713 (18.11)
0.697 (17.70)
0.050 (1.270)
BSC
0.012 (0.30)
0.003 (0.08)
BASE PLANE
SEATING PLANE
0.0200 (0.5080)
0.0100 (0.2540) X 45°
0.013 (0.32)
0.008 (0.20)
0.42" MAX
0.050" TYPICAL
0.050"
TYPICAL
0.0350 (0.8890)
0.0160 (0.4064)
FOOTPRINT
0.030" TYPICAL
28 PLACES
NOTES:
1. ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS)
2. FORMED LEAD SHALL BE PLANAR WITH RESPECT TO ONE ANOTHER WITHIN 0.004 INCHES
3926 FHD F17
12

12 Page





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