Datasheet

Electrical characteristics ST3485EB, ST3485EC
6/21 DocID9102 Rev 6
4 Electrical characteristics
Table 7. Electrical characteristics (V
CC
= 3 V to 3.6 V, 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 = 0 V or V
CC
DE = V
CC
,
RE = 0 V or V
CC
1.3 2.2 mA
DE = 0 V,
RE = 0 V
1.2 1.9 mA
I
SHDN
Shutdown supply current DE = 0 V, RE = V
CC
, DI = 0 V or V
CC
0.002 1 µA
Table 8. Logic input electrical characteristics (V
CC
= 3 V to 3.6 V, 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 2V
I
IN1
Logic input current DE, DI, RE ±2.0 µA
I
IN2
Input current (A, B) DE = 0 V, V
CC
= 0 or 3.6 V
V
IN
= 12 V 1 mA
V
IN
= -7 V -0.8 mA
Table 9. Transmitter electrical characteristics (V
CC
= 3 V to 3.6 V, 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
= 100  (RS-422) (Figure 2)2 V
R
L
= 54  (RS-485) (Figure 2)1.5 V
R
L
= 60  (RS-485) (Figure 3)1.5 V
V
OD
Change in magnitude of
driver differential output
voltage for complementary
output states
(1)
R
L
= 54  or 100  (Figure 2)0.2V
V
OC
Driver common mode
output voltage
R
L
= 54  or 100  (Figure 2)3V
V
OC
Change in magnitude of
driver common mode
output voltage
(1)
R
L
= 54  or 100  (Figure 2)0.2V
I
OSD
Driver short-circuit output
current
±250 mA
1.  V
OD
and  V
OC
are the changes in V
OD
and V
OC
, respectively, when the DI input changes state.