Datasheet

ST485
3/13
DC ELECTRICAL CHARACTERISTICS
(V
CC
=5V± 5%, T
A
=T
MIN
to T
MAX
, unless otherwise specified. Typical values are referred to T
A
= 25°C)
(See Note 1)
Note 1: All currents into device pins are positive; all cuttents out of device pins are negative; all voltages are referenced to device ground
unless specified.
Note 2: Supply current specification is valid for loaded transmitters when V
DE
=0V
Note 3: Applies to peak current. See typical Operating Characteristics.
Symbol Parameter Test Conditions
Value
Unit-40 to 85 °C -55 to 125 °C
Min. Typ. Max. Min. Max.
V
OD1
Differential Driver Output
(No Load)
55V
V
OD2
Differential Driver Output
(With Load)
R
L
=27Ω (RS-485) (See Fig.1)
R
L
=50Ω (RS-422) (See Fig.1)
1.5 5
5
1.4 5
5
V
V
∆V
OD
Change in Magnitude of
Driver Differential Output
Voltage for
Complementary Output
States
R
L
=27Ω or 50Ω (See Fig. 1) 0.2 0.2 V
V
OC
Driver Common-Mode
Output Voltage
R
L
=27Ω or 50Ω (See Fig. 1) 3 3 V
∆V
OC
Change in Magnitude of
Driver Common-Mode
Output Voltage for
Complementary Output
States
R
L
=27Ω or 50Ω (See Fig. 1) 0.2 0.2 V
V
IH
Input High Voltage RE, DE, DI 2.0 2.0 V
V
IL
Input Low Voltage RE, DE, DI 0.8 0.8 V
I
IN1
Input Current RE, DE, DI ± 2 ± 2 µA
I
IN2
Input Current (A, B) V
CM
= 0V or 5.25V V
DE
=0V
V
IN
= 12V
V
IN
= -7V
1
-0.8
1
-0.8
mA
mA
V
TH
Receiver Differential
Threshold Voltage
V
CM
= -7 to 12V -0.2 0.2 -0.2 0.2 V
∆V
TH
Receiver Input Hysteresis V
CM
=0V 70 mV
V
OH
Receiver Output High
Voltage
I
O
= -4mA V
ID
= 200mV 3.5 3.4 V
V
OL
Receiver Output Low
Voltage
I
O
=4mA V
ID
= -200mV 0.4 0.55 V
I
OZR
3-State (High Impedance)
Output Current at
Receiver
V
O
= 0.4 to 2.4V ± 1 ± 1 µA
R
IN
Receiver Input
Resistance
V
CM
= -7 to 12V 24 24 KΩ
I
CC
No Load Supply Current
(Note 2)
V
RE
=0VorV
CC
V
DE
=V
CC
V
DE
=0V
400
300
900
500
900
500
µA
µA
I
OSD1
Driver Short-Circuit
Current, V
O
=High
V
O
= -7 to 12V (Note 3) 35 250 35 250 mA
I
OSD2
Driver Short-Circuit
Current, V
O
=Low
V
O
= -7 to 12V (Note 3) 35 250 35 250 mA
I
OSR
Receiver Short-Circuit
Current
V
O
=0VtoV
CC
7 95795mA