Datasheet

Electrical characteristics ST485EB - ST485EC - ST485EX
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4 Electrical characteristics
V
CC
= 5 V ± 5 %, T
A
= T
MIN
to T
MAX
, unless otherwise specified. Typical values are referred
to T
A
= 25 °C
Table 6. ESD performance: transmitter outputs, receiver inputs
Symbol Parameter Test conditions Min. Typ. Max. Unit
ESD ESD protection voltage Human body model ±15 kV
ESD ESD protection voltage IEC-1000-4-2 ±8kV
Table 7. DC electrical characteristics
Symbol Parameter Test conditions
(1)
Min. Typ. Max. Unit
V
OD1
Differential driver output (no
load)
5V
V
OD2
Differential driver output
(with load)
R
L
= 27 Ω (RS-485) (Figure 2)
R
L
= 50 Ω (RS-422) (Figure 2.)
1.5
5
5
V
V
ΔV
OD
Change in magnitude of
driver differential output
voltage for complementary
output states
R
L
= 27 Ω or 50 Ω (Figure 2)0.2V
V
OC
Driver common-mode output
voltage
R
L
= 27 Ω or 50 Ω (Figure 2)3V
ΔV
OC
Change in magnitude of
driver common-mode output
voltage for complementary
output states
R
L
= 27 Ω or 50 Ω (Figure 2)0.2V
V
IH
Input high voltage RE, DE, DI 2.0 V
V
IL
Input low voltage RE, DE, DI 0.8 V
I
IN1
Input current RE, DE, DI ± 2µA
I
IN2
Input current (A, B)
V
CM
= 0 V or 5.25 V, V
DE
= 0 V
V
IN
= 12 V
V
IN
= -7 V
1
-0.8
mA
mA
V
TH
Receiver differential
threshold voltage
V
CM
= -7 to 12 V -0.2 0.2 V
ΔV
TH
Receiver input hysteresis V
CM
= 0 V 70 mV
V
OH
Receiver output high voltage I
O
= -4 mA, V
ID
= 200 mV 3.5 V
V
OL
Receiver output low voltage I
O
= 4 mA, V
ID
= -200 mV 0.4 V
I
OZR
3-State (high impedance)
output current at receiver
V
O
= 0.4 to 2.4 V ± 1µA
R
IN
Receiver input resistance V
CM
= -7 to 12 V 96 kΩ
I
CC
No load supply current
(2)
V
RE
= 0V or V
CC
V
DE
= V
CC
V
DE
= 0 V
400
300
900
500
µA
µA