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参数资料
| 型号： | E649-EDGE649 |
| 英文描述： | Octal Pin Electronics Driver / Receiver |
| 中文描述： | 八路引脚电子驱动器/接收器 |
| 文件页数： | 11/16页 |
| 文件大小： | 150K |
| 代理商： | E649-EDGE649 |
4
Revision 5 / October 21, 2002
www .semtech.com
TEST AND MEASUREMENT PRODUCTS
Edge649
Circuit Description
Driver Description
Figure 1. Driver Diagram
As shown in Figure 1, Edge649 supports programmable
high and low levels and tristate per channel. There are
no shared lines between any drivers. The DVR EN* and
DATA IN signals are TTL compatible inputs that control
the driver (see Figure 2).
With DVR EN* high, the DUT driver goes into a high
impedance state. With DVR EN* low, DATA IN high forces
the driver into a high state (DUT = V
HIGH), and DATA IN
low forces the driver low (DUT = V
LOW).
Figure 2. Driver Functionality
VHIGH and VLOW
VHIGH and VLOW define the logical “1” and “0” levels of
the DUT driver and can be adjusted anywhere over the
range determined by VCC and VEE. Table 1 documents
the relationship between the analog power to supplies
(VCC and VEE), the driver range (VHIGH and VLOW), and
the comparator threshold range (VTHRESHOLD).
The VHIGH and VLOW inputs are unbuffered in that they
also provide the driver output current (see Figure 3), so
the source of VHIGH and VLOW must have ample current
drive capability.
Figure 3.
Simplified Model of the
Unbuffered Output Stage
Table 1. Power Supply Requirement
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DUT
DATA IN
DVR EN*
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VLOW
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DATA IN
DVR EN*
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VLOW
DUT
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