Datasheet

DRIVER ELECTRICAL CHARACTERISTICS
DRIVER SWITCHING CHARACTERISTICS
SN65HVD179
www.ti.com .................................................................................................................................................... SLLS668C – FEBRUARY 2006 – REVISED JULY 2008
over recommended operating conditions unless otherwise noted
PARAMETER TEST CONDITIONS MIN TYP
(1)
MAX UNIT
V
I(K)
Input clamp voltage I
I
= – 18 mA – 1.5
I
O
= 0 4 V
CC
R
L
= 54 Ω , See Figure 1 (RS-485) 1.7 2.6
|V
OD(SS)
| Steady-state differential output voltage
V
R
L
= 100 Ω , See Figure 1 (RS-422) 2.4 3.2
V
test
= – 7 V to 12 V, See Figure 2 1.6
Change in magnitude of steady-state
Δ |V
OD(SS)
| R
L
= 54 Ω , See Figure 1 and Figure 2 – 0.2 0.2
differential output voltage between states
Differential Output Voltage overshoot and R
L
= 54 Ω , C
L
= 50 pF, See Figure 5 and
V
OD(RING)
10%
(2)
undershoot Figure 3 for definition
V
OC(PP)
Peak-to-peak common-mode output voltage 0.5
V
OC(SS)
Steady-state common-mode output voltage 2.2 3.3
See Figure 4 V
Change in steady-state common-mode
Δ V
OC(SS)
– 0.1 0.1
output voltage
V
CC
= 0 V, V
Z
or V
Y
= 12 V,
90
Other input at 0 V
I
Z(Z)
or
High-impedance state output current µ A
I
Y(Z)
V
CC
= 0 V, V
Z
or V
Y
= – 7 V,
– 10
Other input at 0 V
V
Z
or V
Y
= – 7 V – 250 250
I
Z(S)
or Other input
Short Circuit output current
(3)
mA
I
Y(S)
at 0 V
V
Z
or V
Y
= 12 V – 250 250
I
I
Input current V
I
= 0, V
I
= 2 0 100 µ A
C
(OD)
Differential output capacitance 16 pF
(1) All typical values are at 25 ° C and with a 5-V supply.
(2) 10% of the peak-to-peak Differential Output voltage swing, per TIA/EIA-485.
(3) Under some conditions of short-circuit to negative voltages, output currents exceeding the ANSI TIA/EIA-485-A maximum current of
250 mA may occur. Continuous exposure may affect device reliability.
over recommended operating conditions unless otherwise noted
PARAMETER TEST CONDITIONS MIN TYP
(1)
MAX UNIT
t
PLH
Propagation delay time, low-to-high-level output
4 8 12 ns
t
PHL
Propagation delay time, high-to-low-level output
R
L
= 54 Ω , C
L
= 50 pF,
See Figure 5
t
r
Differential output signal rise time
3 6 12 ns
t
f
Differential output signal fall time
t
sk(p)
Pulse skew (|t
PHL
- t
PLH
|) 1.4 ns
t
sk(pp)
(2)
Part-to-part skew 1 ns
(1) All typical values are at 25 ° C and with a 5-V supply.
(2) t
sk(pp)
is the magnitude of the difference in propagation delay times between any specified terminals of two devices when both devices
operate with the same supply voltages, at the same temperature, and have identical packages and test circuits.
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