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| 型號： | SST28SF040A-150-4CNH |
| 英文描述： | IC SMD |
| 中文描述： | 集成電路貼片 |
| 文件頁數(shù)： | 2/28頁 |
| 文件大小： | 280K |
| 代理商： | SST28SF040A-150-4CNH |
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2
2000 Silicon Storage Technology, Inc.
310-3 6/00
4 Megabit SuperFlash EEPROM
SST28SF040A / SST28VF040A
Data Sheet
Command Definitions
Table 3 contains a command list and a brief summary of
the commands. The following is a detailed description of
the operations initiated by each command.
Sector-Erase Operation
The Sector-Erase operation erases all bytes within a
sector and is initiated by a setup command and an
execute command. A sector contains 256 Bytes. This
sector erasability enhances the flexibility and usefulness
of the SST28SF040A/28VF040A, since most applica-
tions only need to change a small number of bytes or
sectors, not the entire chip.
The setup command is performed by writing 20H to the
device. The execute command is performed by writing
D0H to the device. The Erase operation begins with the
rising edge of the WE# or CE#, whichever occurs first
and terminates automatically by using an internal timer.
The End-of-Erase can be determined using either Data#
Polling, Toggle Bit, or Successive Reads detection
methods. See Figure 8 for timing waveforms.
The two-step sequence of a setup command followed by
an execute command ensures that only memory con-
tents within the addressed sector are erased and other
sectors are not inadvertently erased.
Sector-Erase Flowchart Description
Fast and reliable erasing of the memory contents within
a sector is accomplished by following the Sector-Erase
flowchart as shown in Figure 17. The entire procedure
consists of the execution of two commands. The Sector-
Erase operation will terminate after a maximum of 4 ms.
A Reset command can be executed to terminate the
Sector-Erase operation; however, if the Erase operation
is terminated prior to the 4 ms time-out, the sector may
not be fully erased. A Sector-Erase command can be
reissued as many times as necessary to complete the
Erase operation. The SST28SF040A/28VF040A cannot
be “overerased”.
Chip-Erase Operation
The Chip-Erase operation is initiated by a setup command
(30H) and an execute command (30H). The Chip-Erase
operation allows the entire array of the SST28SF040A/
28VF040A to be erased in one operation, as opposed to
2048 Sector-Erase operations. Using the Chip-Erase
operation will minimize the time to rewrite the entire
memory array. The Chip-Erase operation will terminate
after a maximum of 20 ms. A Reset command can be
executed to terminate the Erase operation; however, if the
Chip-Erase operation is terminated prior to the 20 ms
time-out, the chip may not be completely erased. If an
erase error occurs a Chip-Erase command can be reis-
sued as many times as necessary to complete the Chip-
Erase operation. The SST28SF040A/28VF040A cannot
be overerased. (See Figure 7)
Byte-Program Operation
The Byte-Program operation is initiated by writing the
setup command (10H). Once the program setup is
performed, programming is executed by the next WE#
pulse. See Figures 4 and 5 for timing waveforms. The
address bus is latched on the falling edge of WE# or CE#,
whichever occurs last. The data bus is latched on the
rising edge of WE# or CE#, whichever occurs first, and
begins the Program operation. The Program operation is
terminated automatically by an internal timer. See Figure
15 for the programming flowchart.
The two-step sequence of a setup command followed by
an execute command ensures that only the addressed
byte is programmed and other bytes are not inadvert-
ently programmed.
The Byte-Program Flowchart Description
Programming data into the SST28SF040A/28VF040A is
accomplished by following the Byte-Program flowchart
shown in Figure 15. The Byte-Program command sets up
the byte for programming. The address bus is latched on
the falling edge of WE# or CE#, whichever occurs last.
The data bus is latched on the rising edge of WE# or CE#,
whichever occurs first and begins the Program opera-
tion. The end of program can be detected using either the
Data# Polling, Toggle bit, or Successive reads.
Reset Operation
The Reset command is provided as a means to safely
abort the Erase or Program command sequences. Fol-
lowing either setup commands (Erase or Program) with
a write of FFH will safely abort the operation. Memory
contents will not be altered. After the Reset command,
the device returns to the Read mode. The Reset com-
mand does not enable Software Data Protection. See
Figure 6 for timing waveforms.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SST28SF040A-150-4C-NH | 制造商:SST 制造商全稱:Silicon Storage Technology, Inc 功能描述:4 Mbit (512K x8) SuperFlash EEPROM |
| SST28SF040A-150-4C-PH | 制造商:SST 制造商全稱:Silicon Storage Technology, Inc 功能描述:4 Mbit (512K x8) SuperFlash EEPROM |
| SST28SF040A-150-4C-WH | 制造商:SST 制造商全稱:Silicon Storage Technology, Inc 功能描述:4 Mbit (512K x8) SuperFlash EEPROM |
| SST28SF040A-150-4I-EH | 制造商:SST 制造商全稱:Silicon Storage Technology, Inc 功能描述:4 Mbit (512K x8) SuperFlash EEPROM |
| SST28SF040A-150-4I-NH | 制造商:SST 制造商全稱:Silicon Storage Technology, Inc 功能描述:4 Mbit (512K x8) SuperFlash EEPROM |
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