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參數(shù)資料
| 型號： | E646-EDGE646 |
| 英文描述： | Pin Electronics Driver. Window Comparator. and Switch Matrix |
| 中文描述： | 引腳電子驅(qū)動程序。窗口比較器。和開關矩陣 |
| 文件頁數(shù)： | 11/14頁 |
| 文件大?。?/td> | 140K |
| 代理商： | E646-EDGE646 |
6
Revision 2 / October 21, 2002
www .semtech.com
TEST AND MEASUREMENT PRODUCTS
Edge646
Application Information
PRELIMINARY
Power Supplies Decoupling
A .1
F capacitor is recommended between VCC and VEE.
In addition, solid VCC and VEE planes are recommended
to provide a low inductance path for the power supply
currents. These planes will reduce any inductive supply
drops associated with swtiching currents on the power
supply pins. If solid planes are not possible, then wide
power busses are preferable.
VH, VL, and VTT Decoupling
As the VH, VL, and VTT inputs are unbuffered and must
supply the driver output current, decoupling capacitors for
these inputs are recommended in proportion to the amount
of output current the application requires. In general, a
surge current of 50 mA (5V swings series terminated with
50 Ohms into a 50 Ohm transmission line) are the maxi-
mum dynamic output currents the driver should see. The
decoupling capacitors should be able to provide this cur-
rent for the duration of the round trip time between the
pin electronics and the DUT, and then recharge themselves
before the next such transition would occur. Once this
condition is satisfied, the VH, VL, and VTT supply voltages
are more responsible for establishing the DC levels asso-
ciated with each function and recharging the capacitors,
rather than providing the actual dynamic currents required
to drive the DUT transmission line.
Ideally, VH, VL, and VTT would each have a dedicated power
layer on the PC board for the lowest possible inductance
power supply distribution.
VCC
VEE
1N5820 or
Equivalent
Power Supplies
The Edge646 uses two power supplies for circuit opera-
tion; VCC and VEE. In order to protect the Edge646 and
avoid damaging it, the following power supply requirements
must be satisifed at all times:
VEE
≤ All Inputs ≤ VCC
The sequence below can be used as a guideline when
operating the Edge646:
Power-On Sequencing
Power-Off Sequencing
1. VCC (substrate)
1. Inputs
2. VEE
3. Inputs
3. VCC
The two diode configuration shown in Figure 3 should be
used on a once-per-board basis to ensure power supply
sequence and fault tolerance.
Figure 3. Power Supply Protection Scheme
Warning: It is extremely important that the voltage
on any device pin does not exceed the range of VEE
–0.5V to VCC +0.5V at any time, either during power
up, normal operation, or during power down. Failure
to adhere to this requirement could result in latchup
of the device, which could be destructive if the sys-
tem power supplies are capable of supplying large
amounts of current. Even if the device is not imme-
diately destroyed, the cumulative damage caused by
the stress of repeated latchup may affect device re-
liability.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| E64710-000 | 制造商:TE Connectivity 功能描述:TXR66SJ00-3616AI - Bulk |
| E-6471-021 | 制造商:MOLEX 制造商全稱:Molex Electronics Ltd. 功能描述:2.54mm (.100) Pitch KK? Crimp Terminal Housing, Friction Ramp, 2 Circuits, Use with 4809 |
| E-6471-031 | 制造商:MOLEX 制造商全稱:Molex Electronics Ltd. 功能描述:2.54mm (.100) Pitch KK? Crimp Terminal Housing, Friction Ramp, 3 Circuits, Use with 4809 |
| E-6471-041 | 制造商:MOLEX 制造商全稱:Molex Electronics Ltd. 功能描述:2.54mm (.100) Pitch KK? Crimp Terminal Housing, Friction Ramp, 4 Circuits, Use with 4809 |
| E-6471-051 | 制造商:MOLEX 制造商全稱:Molex Electronics Ltd. 功能描述:2.54mm (.100) Pitch KK? Crimp Terminal Housing, Friction Ramp, 5 Circuits, Use with 4809 |
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