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參數(shù)資料
| 型號(hào)： | X84041V |
| 英文描述： | Micro Port Saver E2PROM |
| 中文描述： | 微型端口節(jié)電器E2PROM的 |
| 文件頁(yè)數(shù)： | 2/13頁(yè) |
| 文件大小： | 67K |
| 代理商： | X84041V |
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X84041
2
A Write Protect (
WP
) pin provides hardware protection
against inadvertent writes to the memory.
Xicor E
2
PROMs are designed and tested for applica-
tions requiring extended endurance. Inherent data re-
tention is greater than 100 years.
PIN DESCRIPTIONS
Chip Enable (
CE
)
The Chip Enable input must be LOW to enable all read/
write operations. When
CE
is HIGH, the chip is dese-
lected, the I/O pin is in the high impedance state, and
unless a nonvolatile write operation is underway, the
X84041 is in the standby power mode.
Output Enable (
OE
)
The Output Enable input must be LOW to enable the
output buffer and to read data from the X84041 on the
I/O line.
Write Enable (
WE
)
The Write Enable input must be LOW to write either data
or command sequences to the X84041.
Data In/Data Out (I/O)
Data and command sequences are serially written to or
serially read from the X84041 through the I/O pin.
Write Protect (
WP
)
When the Write Protect input is LOW, nonvolatile writes
to the X84041 are disabled. When
WP
is HIGH, all
functions, including nonvolatile writes, operate normally.
If a nonvolatile write cycle is in progress,
WP
going LOW
will have no effect on the cycle already underway, but
will inhibit any additional nonvolatile write cycles.
DEVICE OPERATION
The X84041 is a serial 512 x 8 bit E
2
PROM designed to
interface directly with most microprocessor buses. Stan-
dard
CE
,
OE
, and
WE
signals control the read and write
operations, and a single l/O line is used to send and
receive data and commands serially.
Data Timing
Data input on the l/O line is latched on the rising edge of
either
WE
or
CE
, whichever occurs first. Data output on
the l/O line is active whenever both
OE
and
CE
are LOW.
Care should be taken to ensure that
WE
and
OE
are
never both LOW while
CE
is LOW.
Read Sequence
A read sequence consists of sending a 16-bit address
followed by the reading of data serially. The address is
written by issuing 16 separate write cycles (
WE
and
CE
LOW,
OE
HIGH) to the part without a read cycle be-
tween the write cycles. The address is sent serially, most
significant bit first, over the I/O line. Note that this
sequence is fully static, with no special timing restric-
tions, and the processor is free to perform other tasks on
the bus whenever the X84041
CE
pin is HIGH. Once the
16 address bits are sent, a byte of data can be read on
the I/O line by issuing 8 separate read cycles (
OE
and
CE
LOW,
WE
HIGH). At this point, issuing a reset
sequence will terminate the read sequence, otherwise
the X84041 will await further reads in the sequential
read mode.
Sequential Read
The byte address is automatically incremented to the
next higher address after each byte of data is read. The
data stored in the memory at the next address can be
read sequentially by continuing to issue read cycles.
When the highest address is reached ($1FF), the ad-
dress counter rolls over to address $000 and reading
may be continued indefinitely.
Reset Sequence
The reset sequence resets the X84041 and sets an
internal write enable latch. A reset sequence can be sent
at any time by performing a read/write “0”/read se-
quence (see Figs. 1 and 2). This sequence breaks the
multiple read or write cycle sequences that are normally
used when reading from or writing to the part. This
sequence can be used at any time to interrupt or end a
sequential read or page load. As soon as the write “0”
cycle is complete, the part is reset (unless a nonvolatile
write cycle is in progress). The second read cycle in this
sequence, and any further read cycles, will read a HIGH
on the l/O pin until a valid read sequence is issued. The
reset sequence must be issued at the beginning of both
read and write sequences to be sure the X84041
initiates these operations properly.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| X84041V-2.7 | Micro Port Saver E2PROM |
| X84041V-3 | Micro Port Saver E2PROM |
| X84129ZI | Serial EEPROM |
| X84129ZI-1.8 | Serial EEPROM |
| X84129ZM | Serial EEPROM |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| X84041V-2.7 | 制造商:XICOR 制造商全稱:Xicor Inc. 功能描述:Micro Port Saver E2PROM |
| X84041V-3 | 制造商:XICOR 制造商全稱:Xicor Inc. 功能描述:Micro Port Saver E2PROM |
| X84041VI | 制造商:XICOR 制造商全稱:Xicor Inc. 功能描述:Micro Port Saver E2PROM |
| X84041VI2.7 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Serial EEPROM |
| X84041VI-2.7 | 制造商:XICOR 制造商全稱:Xicor Inc. 功能描述:Micro Port Saver E2PROM |
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