- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄364551 > 8XC51SL.LOWVOLTAGE8XC51SL (Intel Corp.) KEYBOARD CONTROLLER PDF資料下載
參數(shù)資料
| 型號： | 8XC51SL.LOWVOLTAGE8XC51SL |
| 廠商： | Intel Corp. |
| 英文描述： | KEYBOARD CONTROLLER |
| 中文描述： | 鍵盤控制器 |
| 文件頁數(shù)： | 55/58頁 |
| 文件大?。?/td> | 233K |
| 代理商： | 8XC51SL.LOWVOLTAGE8XC51SL |
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頁當前第55頁第56頁第57頁第58頁
2003 Oct 30
55
Philips Semiconductors
Product specification
Low power single card reader
TDA8029
15 SOLDERING
15.1
Introduction to soldering surface mount
packages
Thistextgivesaverybriefinsighttoacomplextechnology.
A more in-depth account of soldering ICs can be found in
our “Data Handbook IC26; Integrated Circuit Packages”
(document order number 9398 652 90011).
There is no soldering method that is ideal for all surface
mount IC packages. Wave soldering can still be used for
certainsurfacemountICs,butitisnotsuitableforfinepitch
SMDs. In these situations reflow soldering is
recommended.
15.2
Reflow soldering
Reflow soldering requires solder paste (a suspension of
fine solder particles, flux and binding agent) to be applied
to the printed-circuit board by screen printing, stencilling or
pressure-syringe dispensing before package placement.
Driven by legislation and environmental forces the
worldwide use of lead-free solder pastes is increasing.
Several methods exist for reflowing; for example,
convection or convection/infrared heating in a conveyor
type oven. Throughput times (preheating, soldering and
cooling) vary between 100 and 200 seconds depending
on heating method.
Typical reflow peak temperatures range from
215 to 270
°
C depending on solder paste material. The
top-surface temperature of the packages should
preferably be kept:
below 220
°
C (SnPb process) or below 245
°
C (Pb-free
process)
– for all BGA and SSOP-T packages
– for packages with a thickness
≥
2.5 mm
– for packages with a thickness < 2.5 mm and a
volume
≥
350 mm
3
so called thick/large packages.
below 235
°
C (SnPb process) or below 260
°
C (Pb-free
process) for packages with a thickness < 2.5 mm and a
volume < 350 mm
3
so called small/thin packages.
Moisture sensitivity precautions, as indicated on packing,
must be respected at all times.
15.3
Wave soldering
Conventional single wave soldering is not recommended
forsurfacemountdevices(SMDs)orprinted-circuitboards
with a high component density, as solder bridging and
non-wetting can present major problems.
To overcome these problems the double-wave soldering
method was specifically developed.
If wave soldering is used the following conditions must be
observed for optimal results:
Use a double-wave soldering method comprising a
turbulent wave with high upward pressure followed by a
smooth laminar wave.
For packages with leads on two sides and a pitch (e):
– larger than or equal to 1.27 mm, the footprint
longitudinal axis is
preferred
to be parallel to the
transport direction of the printed-circuit board;
– smaller than 1.27 mm, the footprint longitudinal axis
must
be parallel to the transport direction of the
printed-circuit board.
The footprint must incorporate solder thieves at the
downstream end.
Forpackageswithleadsonfoursides,thefootprintmust
be placed at a 45
°
angle to the transport direction of the
printed-circuit board. The footprint must incorporate
solder thieves downstream and at the side corners.
During placement and before soldering, the package must
be fixed with a droplet of adhesive. The adhesive can be
applied by screen printing, pin transfer or syringe
dispensing. The package can be soldered after the
adhesive is cured.
Typical dwell time of the leads in the wave ranges from
3 to 4 seconds at 250
°
C or 265
°
C, depending on solder
material applied, SnPb or Pb-free respectively.
A mildly-activated flux will eliminate the need for removal
of corrosive residues in most applications.
15.4
Manual soldering
Fix the component by first soldering two
diagonally-opposite end leads. Use a low voltage (24 V or
less) soldering iron applied to the flat part of the lead.
Contact time must be limited to 10 seconds at up to
300
°
C.
When using a dedicated tool, all other leads can be
soldered in one operation within 2 to 5 seconds between
270 and 320
°
C.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 8XC51SLLOWVOLTAGE8XC51SL | KEYBOARD CONTROLLER |
| 8XC52 | 80C51 8-Bit Microcontroller Family (8K ROM,Low Voltage (2.7V-5.5V), Low Power, High Speed (33 MHz) )(80C51 8位微控制器系列產(chǎn)品) |
| 8XC54 | 80C51 8-bit microcontroller family 8K-64K/256-1K OTP/ROM/ROMless, low voltage 2.7V-5.5V), low power, high speed (33 MHz) |
| 8XC58 | 80C51 8-bit microcontroller family 8XC51FA/FB/FC/80C51FA8XC51RA+/RB+/RC+/RD+/80C51RA +8K 4K/256K OTP/ROM/ROMless,low voltage, low power, high speed (33 MHz)(80C51 8位微控制器系列產(chǎn)品) |
| 8XC562 | 80C51 FAMILY DERIVATIVES |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 8XC52 | 制造商:INTEL 制造商全稱:Intel Corporation 功能描述:CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER |
| 8XC54 | 制造商:INTEL 制造商全稱:Intel Corporation 功能描述:CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER |
| 8XC54/58 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:(360.35 k) |
| 8XC552 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:80C51 FAMILY DERIVATIVES |
| 8XC562 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:80C51 FAMILY DERIVATIVES |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。