E749BPJ(1998) 查看數據表（PDF） - Semtech Corporation

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E749BPJ
(Rev.:1998)

Octal Pin Electronics Driver/Receiver

Semtech Corporation 

EDGE HIGH-PERFORMANCE PRODUCTS

Circuit Description (continued)

Driver Output Protection

In a functional testing environment, where a resistor is

added in series with the driver output (to create a 50Ω

output impedance), the Edge749 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

Edge749 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

 2000 Semtech Corp.

5

Edge749

www.semtech.com

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