- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄370443 > HCD40C4082 (Hitachi,Ltd.) Low-Voltage AS Microcomputers with On-Chip A/D Converter(帶片上A/D轉(zhuǎn)換器的低壓微計算機) PDF資料下載
參數(shù)資料
| 型號： | HCD40C4082 |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | Low-Voltage AS Microcomputers with On-Chip A/D Converter(帶片上A/D轉(zhuǎn)換器的低壓微計算機) |
| 中文描述： | 低電壓如同在微機芯片的A / D轉(zhuǎn)換器（帶片上的A / D轉(zhuǎn)換器的低壓微計算機） |
| 文件頁數(shù)： | 122/162頁 |
| 文件大?。?/td> | 482K |
| 代理商： | HCD40C4082 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁第89頁第90頁第91頁第92頁第93頁第94頁第95頁第96頁第97頁第98頁第99頁第100頁第101頁第102頁第103頁第104頁第105頁第106頁第107頁第108頁第109頁第110頁第111頁第112頁第113頁第114頁第115頁第116頁第117頁第118頁第119頁第120頁第121頁當(dāng)前第122頁第123頁第124頁第125頁第126頁第127頁第128頁第129頁第130頁第131頁第132頁第133頁第134頁第135頁第136頁第137頁第138頁第139頁第140頁第141頁第142頁第143頁第144頁第145頁第146頁第147頁第148頁第149頁第150頁第151頁第152頁第153頁第154頁第155頁第156頁第157頁第158頁第159頁第160頁第161頁第162頁
HD404374/HD404384/HD404389/HD404082/HD404084 Series
122
Notes on PROM Programming
Principles of Programming/Erasure:
A memory cell in a ZTAT microcomputer is the same as an
EPROM cell; it is programmed by applying a high voltage between its control gate and drain to inject hot
electrons into its floating gate. These electrons are stable, surrounded by an energy barrier formed by an
SiO
2
film. The change in threshold voltage of a memory cell with a charged floating gate makes the
corresponding bit appear as 0; a cell whose floating gate is not charged appears as a 1 bit (figure 73).
The charge in a memory cell may decrease with time. This decrease is usually due to one of the following
causes:
Ultraviolet light excites electrons, allowing them to escape. This effect is the basis of the erasure
principle.
Heat excites trapped electrons, allowing them to escape.
High voltages between the control gate and drain may erase electrons.
If the oxide film covering a floating gate is defective, the electron erasure rate will be greater. However,
electron erasure does not often occur because defective devices are detected and removed at the testing
stage.
Control gate
Floating gate
Drain
SiO
2
Source
N
N
+
+
Control gate
Floating gate
Drain
SiO
2
Source
N
N
+
+
Erasure (1)
Write (0)
Figure 73 Cross-Sections of a PROM Cell
PROM Programming:
PROM memory cells must be programmed under specific voltage and timing
conditions. The higher the programming voltage V
PP
and the longer the programming pulse t
PW
is applied,
the more electrons are injected into the floating gates. However, if V
PP
exceeds specifications, the pn
junctions may be permanently damaged. Pay particular attention to overshooting in the PROM
programmer. In addition, note that negative voltage noise will produce a parasitic transistor effect that may
reduce breakdown voltages.
The ZTAT microcomputer is electrically connected to the PROM programmer by a socket adapter.
Therefore, note the following points:
Check that the socket adapter is firmly mounted on the PROM programmer.
Do not touch the socket adapter or the LSI during the programming. Touching them may affect the
quality of the contacts, which will cause programming errors.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HCD404082 | Low-Voltage AS Microcomputers with On-Chip A/D Converter(帶片上A/D轉(zhuǎn)換器的低壓微計算機) |
| HCD404084 | Low-Voltage AS Microcomputers with On-Chip A/D Converter(帶片上A/D轉(zhuǎn)換器的低壓微計算機) |
| HCD40C4084 | Low-Voltage AS Microcomputers with On-Chip A/D Converter(帶片上A/D轉(zhuǎn)換器的低壓微計算機) |
| HCD40C4344R | 4-bit HMCS400-series microcomputer(4位單片微計算機) |
| HCD44780UBxx | 320 x 240 pixel format, CFL backlight available with power harness |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HCD40C4344R | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:4-bit microcomputers |
| HCD44780UA00 | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Dot Matrix Liquid Crystal Display Controller/Driver |
| HCD44780UA02 | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Dot Matrix Liquid Crystal Display Controller/Driver |
| HCD44780UBXX | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Dot Matrix Liquid Crystal Display Controller/Driver |
| HCD48-3318-75 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:DC to DC Converter |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。