E649BPJ Datasheet, PDF (5/14 Pages) Semtech Corporation – Octal Pin Electronics Driver/Receiver

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, 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
 2000 Semtech Corp.
5
Edge649
www.semtech.com