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E649

Octal Pin Electronics Driver/Receiver

Semtech Corporation 

TEST AND MEASUREMENT PRODUCTS

Circuit Description (continued)

Driver Output Protection

In a functional testing environment, where a resistor is

added in series with the driver output, the Edge649 can

withstand a short to any legal DUT voltage for an indefinite

amount of time.

In a low impedance application with no additional output

series resistance, care must be exercised and systems

should be designed to check for this condition and tristate

the driver if a short is detected.

Receiver Functionality

Edge649 supports programmable thresholds per

channel. There are no shared lines between comparators.

THRESHOLD is a high input impedance analog input

which defines a logical “1” and “0” at the DUT (see

Figure 4). If the DUT voltage is more positive than

THRESHOLD, DATA OUT will be high. With DUT lower

than THRESHOLD, DATA OUT will be low.

DATA OUT

+

DUT

–

THRESHOLD

THRESHOLD

DUT

DATA OUT

Tpd

Figure 4. Receiver Functionality

Revision 5 / October 21, 2002

5

Edge649

www .semtech.com

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