Datasheet

0
5
10
15
20
25
0 4.7 6.8 10 15 22 33 47 68 100
Slope (V/us)
Slope Control Resistance - kΩ
SN65HVD233-HT
www.ti.com SLLS933F –NOVEMBER 2008–REVISED AUGUST 2012
The standard specifies the interconnect to be a single twisted-pair cable (shielded or unshielded) with 120-Ω
characteristic impedance (Z
O
). Resistors equal to the characteristic impedance of the line terminate both ends of
the cable to prevent signal reflections. Unterminated drop lines (stubs) connecting nodes to the bus should be
kept as short as possible to minimize signal reflections.
Slope Control
The rise and fall slope of the SN65HVD233 driver output can be adjusted by connecting a resistor from R
s
(pin 8)
to ground (GND), or to a low-level input voltage (see Figure 28).
The slope of the driver output signal is proportional to the pin's output current. This slope control is implemented
with an external resistor value of 10 kΩ to achieve a ≉15-V/μs slew rate, and up to 100 kΩ to achieve a ≉2.0-
V/μs slew rate (see Figure 29). Typical driver output waveforms with slope control are displayed in Figure 30.
Figure 28. Slope Control/Standby Connection to DSP
Figure 29. SN65HVD233 Driver Output Signal Slope vs Slope Control Resistance Value
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