UG121 Rev.0.00
Page 8 of 20
May 3, 2017
ISL71026MEVAL1Z
3. Using the Board to Measure Propagation Delay, Skew, and Rise/Fall Time
(8) In fast speed mode (RS = 0V):
• t
PLH
should be around 75ns and no greater than 150ns.
• t
PHL
should be around 80ns and no greater than 155ns.
• t
rise
should be around 55ns and no less than 20ns or greater than 100ns.
• t
fall
should be around 25ns and no less than 10ns or greater than 75ns.
(9) Move the jumper from J8 to J7 (selects medium driver edges by connecting the RS pin to ground through a
10kΩ resistor). Note: No jumpers should be installed at J5, J6, J8, and J9.
(10) The scope plot should look like the ones in
.
(11) In medium speed mode (RS = 10kΩ):
• t
PLH
should be around 520ns and no greater than 850ns.
• t
PHL
should be around 460ns and no greater than 800ns.
• t
r
should be around 400ns and no less than 200ns or greater than 780ns.
• t
f
should be around 300ns and no less than 175ns or greater than 500ns.
(12) Move the jumper from J7 to J6 (selects slow driver edges by connecting the RS pin to ground through a 50kΩ
resistor). Note: No jumpers should be installed at J5, J7, J8, and J9.
(13) The scope plot should look like the ones in
(14) In slow speed mode (RS = 50kΩ):
• t
PLH
should be around 850ns and no greater than 1400ns.
• t
PHL
should be around 725ns and no greater than 1300ns.
• t
r
should be around 700ns and no less than 400ns or greater than 1400ns.
• t
f
should be around 650ns and no less than 300ns or greater than 1000ns.
Summary of Contents for ISL71026MEVAL1Z
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