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| 型号： | ICS889875AK |
| 厂商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分类： | 时钟及定时 |
| 英文描述： | 889875 SERIES, LOW SKEW CLOCK DRIVER, 2 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), QCC16 |
| 封装： | 3 X 3 MM, 0.95 MM HEIGHT, MO-220, VFQFN-16 |
| 文件页数： | 2/15页 |
| 文件大小： | 1123K |
| 代理商： | ICS889875AK |
ICS889875
DIFFERENTIAL-TO-LVDS BUFFER/DIVIDER W/INTERNAL TERMINATION
IDT / ICS LVDS BUFFER/DIVIDER W/INTERNAL TERMINATION
10
ICS889875AK REV. A FEBRUARY 13, 2008
VFQFN EPAD Thermal Release Path
In order to maximize both the removal of heat from the package
and the electrical performance, a land pattern must be
incorporated on the Printed Circuit Board (PCB) within the footprint
of the package corresponding to the exposed metal pad or
exposed heat slug on the package, as shown in Figure 4. The
solderable area on the PCB, as defined by the solder mask, should
be at least the same size/shape as the exposed pad/slug area on
the package to maximize the thermal/electrical performance.
Sufficient clearance should be designed on the PCB between the
outer edges of the land pattern and the inner edges of pad pattern
for the leads to avoid any shorts.
While the land pattern on the PCB provides a means of heat
transfer and electrical grounding from the package to the board
through a solder joint, thermal vias are necessary to effectively
conduct from the surface of the PCB to the ground plane(s). The
land pattern must be connected to ground through these vias. The
vias act as “heat pipes”. The number of vias (i.e. “heat pipes”) are
application specific and dependent upon the package power
dissipation as well as electrical conductivity requirements. Thus,
thermal and electrical analysis and/or testing are recommended to
determine the minimum number needed. Maximum thermal and
electrical performance is achieved when an array of vias is
incorporated in the land pattern. It is recommended to use as many
vias connected to ground as possible. It is also recommended that
the via diameter should be 12 to 13mils (0.30 to 0.33mm) with 1oz
copper via barrel plating. This is desirable to avoid any solder
wicking inside the via during the soldering process which may
result in voids in solder between the exposed pad/slug and the
thermal land. Precautions should be taken to eliminate any solder
voids between the exposed heat slug and the land pattern. Note:
These recommendations are to be used as a guideline only. For
further information, please refer to the Application Note on the
Surface Mount Assembly of Amkor’s Thermally/Electrically
Enhance Leadfame Base Package, Amkor Technology.
Figure 4. P.C. Assembly for Exposed Pad Thermal Release Path – Side View (drawing not to scale)
2.5V LVDS Driver Termination
Figure 5 shows a typical termination for LVDS driver in
characteristic impedance of 100
differential (50 single)
transmission line environment. For buffer with multiple LDVS driver,
it is recommended to terminate the unused outputs.
Figure 5. Typical LVDS Driver Termination
SOLDER
PIN
EXPOSED HEAT SLUG
PIN PAD
GROUND PLANE
LAND PATTERN
(GROUND PAD)
THERMAL VIA
2.5V
LVDS Driver
R1
100
–
+
2.5V
50
50
100
Differential Transmission Line
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