Electrical characteristics ST3485E
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4 Electrical characteristics
Table 6. Electrical characteristics
V
CC
= 3V to 3.6V, T
A
= -40 to 85°C, unless otherwise specified. Typical values are referred
to T
A
= 25°C)
Symbol Parameter Test conditions Min. Typ. Max. Unit
I
SUPPLY
V
CC
Power supply current No Load, DI=0V or V
CC
DE=V
CC
,
RE
=0V or V
CC
1.3 2.2 mA
DE=0V,
RE=0V
1.2 1.9 mA
I
SHDN
Shutdown supply current DE=0V, RE=V
CC
, DI=0V or V
CC
0.002 1 µA
Table 7. Logic input electrical characteristics
V
CC
= 3V to 3.6V, T
A
= -40 to 85°C, unless otherwise specified. Typical values are referred
to T
A
= 25°C)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
IL
Input logic threshold low DE, DI, RE 1.3 0.8 V
V
IH
Input logic threshold high DE, DI, RE 2 V
I
IN1
Logic input current DE, DI, RE ± 2.0 µA
I
IN2
Input current (A, B) DE=0V, V
CC
= 0 or 3.6V
V
IN
=12V 1 mA
V
IN
=-7V -0.8 mA
Table 8. Transmitter electrical characteristics
V
CC
= 3V to 3.6V, T
A
= -40 to 85°C, unless otherwise specified. Typical values are referred
to T
a
= 25°C)
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
OD
Differential drive output
R
L
= 100Ω (RS-422) (Figure 1.)2 V
R
L
= 54Ω (RS-485) (Figure 1.)1.5 V
R
L
= 60Ω (RS-485) (Figure 2.)1.5 V
∆V
OD
Change in magnitude of driver
differential output voltage for
complementary output states
(Note: 1)
R
L
= 54Ω or 100Ω (Figure 1.)0.2V
V
OC
Driver common mode output
voltage
R
L
= 54Ω or 100Ω (Figure 1.)3V
∆V
OC
Change in magnitude of driver
common mode output voltage
(Note: 1)
R
L
= 54Ω or 100Ω (Figure 1.)0.2V
I
OSD
Driver short circuit output
current
± 250 mA
