Datasheet
SN65HVD1785, SN65HVD1786
SN65HVD1787, SN65HVD1791
SN65HVD1792, SN65HVD1793
SLLS872H –JANUARY 2008–REVISED FEBRUARY 2010
www.ti.com
ELECTRICAL CHARACTERISTICS
over recommended operating conditions (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
RS-485 with T
A
≤ 85°C 1.5
common-mode load,
V
CC
> 4.75 V, see
T
A
≤ 105°C 1.4
|V
OD
| Driver differential output voltage magnitude V
Figure 1
R
L
= 54 Ω, 4.75 V ≤ V
CC
≤ 5.25 V 1.5 2
R
L
= 100 Ω, 4.75 V ≤ V
CC
≤ 5.25 V 2 2.5
Change in magnitude of driver differential output
Δ|V
OD
| R
L
= 54 Ω –0.2 0 0.2 V
voltage
V
OC(SS)
Steady-state common-mode output voltage 1 V
CC
/2 3 V
Change in differential driver output
ΔV
OC
–100 0 100 mV
common-mode voltage
Peak-to-peak driver common-mode output Center of two 27-Ω load resistors, See
V
OC(PP)
500 mV
voltage Figure 2
C
OD
Differential output capacitance 23 pF
Positive-going receiver differential input voltage
V
IT+
–100 –10 mV
threshold
Negative-going receiver differential input
V
IT–
V
CM
= –20 V to 25 V –200 –150 mV
voltage threshold
Receiver differential input voltage threshold
V
HYS
30 50 mV
hysteresis (V
IT+
– V
IT–
)
V
CC
I
OH
= –8 mA 2.4
– 0.3
V
OH
Receiver high-level output voltage V
I
OH
= –400 mA 4
T
A
≤ 85°C 0.2 0.4
V
OL
Receiver low-level output voltage I
OL
= 8 mA V
T
A
≤ 105°C 0.2 0.5
Driver input, driver enable, and receiver enable
I
I
–100 100 mA
input current
I
OZ
Receiver output high-impedance current V
O
= 0 V or V
CC
, RE at V
CC
–1 1 mA
I
OS
Driver short-circuit output current –250 250 mA
V
I
= 12 V 75 125
85, 86,
91, 92
V
I
= –7 V –100 –40
V
CC
= 4.5 to 5.5 V or
I
I
Bus input current (disabled driver) mA
V
CC
= 0 V, DE at 0 V
V
I
= 12 V 500
87, 93
V
I
= –7 V –400
DE = V
CC
,
Driver and receiver
RE = GND, 4 6
enabled
no load
DE = V
CC
,
Driver enabled,
RE = V
CC
, 3 5 mA
receiver disabled
no load
I
CC
Supply current (quiescent)
DE = GND,
Driver disabled,
RE = GND, 2 4
receiver enabled
no load
DE = GND,
Driver and receiver D = open
0.5 5 mA
disabled RE = V
CC
,
no load
Supply current (dynamic) See TYPICAL CHARACTERISTICS section
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