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PDF X28HC256 Data sheet ( Hoja de datos )
| Número de pieza | X28HC256 | |
| Descripción | Byte Alterable EEPROM | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
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DATASHEET
256k, 32k x 8-Bit, 5V, Byte Alterable EEPROM
X28HC256
The X28HC256 is a second generation high performance
CMOS 32k x 8 EEPROM. It is fabricated with Intersil’s
proprietary, textured poly floating gate technology, providing a
highly reliable 5V only nonvolatile memory.
The X28HC256 supports a 128-byte page write operation,
effectively providing a 24µs/byte write cycle, and enabling the
entire memory to be typically rewritten in less than 0.8s. The
X28HC256 also features DATA polling and Toggle bit polling,
two methods of providing early end of write detection. The
X28HC256 also supports the JEDEC standard software data
protection feature for protecting against inadvertent writes
during power-up and power-down.
Endurance for the X28HC256 is specified as a minimum
100,000 write cycles per byte and an inherent data retention
of 100 years.
Features
• Access time: 90ns
• Simple byte and page write
- Single 5V supply
- No external high voltages or VP-P control circuits
- Self timed
- No erase before write
- No complex programming algorithms
- No overerase problem
• Low power CMOS
- Active: 60mA
- Standby: 500µA
• Software data protection
- Protects data against system level inadvertent writes
• High speed page write capability
• Highly reliable Direct Write™ cell
- Endurance: 100,000 cycles
- Data retention: 100 years
• Early end of write detection
- DATA polling
- Toggle bit polling
• RoHS compliant
August 27, 2015
FN8108.5
A0 TO A14
ADDRESS
INPUTS
CE
OE
WE
VCC
VSS
X BUFFERS
LATCHES AND
DECODER
256k BIT
EEPROM
ARRAY
Y BUFFERS
LATCHES AND
DECODER
CONTROL
LOGIC AND
TIMING
I/O BUFFERS
AND LATCHES
I/O0 TO I/O7
DATA INPUTS/OUTPUTS
FIGURE 1. BLOCK DIAGRAM
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2005-2007, 2010, 2011, 2015. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
1 page  
AC Conditions of Test
Input pulse levels
Input rise and fall times
Input and output timing levels
Mode Selection
CE OE WE
MODE
L LH
Read
LHL
Write
H X X Standby and write
inhibit
X L X Write inhibit
X X H Write inhibit
Equivalent AC Load Circuit
X28HC256
Symbol Table
0V to 3V
5ns
1.5V
WAVEFORM INPUTS
Must be
steady
I/O
DOUT
DIN
High Z
POWER
active
active
standby
——
——
May change
from LOW
to HIGH
May change
from HIGH
to LOW
Don’t Care:
Changes
Allowed
N/A
OUTPUTS
Will be
steady
Will change
from LOW
to HIGH
Will change
from HIGH
to LOW
Changing:
State Not
Known
Center Line
is High
Impedance
5V
1.92k
OUTPUT
1.37k
30pF
FIGURE 2. EQUIVALENT AC LOAD CIRCUIT
AC Electrical Specifications Across recommended operating conditions, unless otherwise specified.
X28HC256-70
X28HC256-90
X28HC256-12
X28HC256-15
PARAMETER
SYMBOL
MIN MAX MIN
MAX MIN MAX MIN
MAX UNIT
Read Cycle Time
tRC 70
90 120 150 ns
Chip Enable Access Time
tCE 70 90 120 150 ns
Address Access Time
tAA 70 90 120 150 ns
Output Enable Access Time
tOE 35 40 50 50 ns
CE LOW to Active Output
tLZ (Note 9)
0
0
0
0 ns
OE LOW to Active Output
tOLZ (Note 9)
0
0
0
0 ns
CE HIGH to High Z Output
tHZ (Note 9)
35
40
50 50 ns
OE HIGH to High Z Output
tOHZ (Note 9)
35
40
50 50 ns
Output Hold from Address Change
tOH 0
0
0
0 ns
NOTE:
9. tLZ minimum, tHZ, tOLZ minimum and tOHZ are periodically sampled and not 100% tested, tHZ and tOHZ are measured with CL = 5pF, from the point
when CE, OE return HIGH (whichever occurs first) to the time when the outputs are no longer driven..
Submit Document Feedback
5
FN8108.5
August 27, 2015
5 Page 
LAST
WE WRITE
CE
OE
I/O7
VIH
A0 TO A14
An
X28HC256
HIGH Z
VOL
An An
An
An
An
FIGURE 8. DATA POLLING BUS SEQUENCE
WRITE DATA
WRITES
COMPLETE?
NO
YES
SAVE LAST DATA
AND ADDRESS
READ LAST
ADDRESS
IO7
COMPARE?
YES
NO
X28HC256
READY
FIGURE 9. DATA POLLING SOFTWARE FLOW
VOH
X28HC256
READY
An
Submit Document Feedback 11
FN8108.5
August 27, 2015
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet X28HC256.PDF ] | |
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