Datasheet
DS485
www.ti.com
SNLS122C –JULY 1998–REVISED APRIL 2013
ELECTRICAL CHARACTERISTICS
Over Supply Voltage and Operating Temperature Ranges, unless otherwise specified
(1)(2)
Symbol Parameter Conditions Pin Min Typ Max Units
V
OD1
Differential Driver Output Voltage (No Load) A, B 5 V
V
OD2
Differential Driver Output Voltage R
L
= 50Ω, (RS422), See Figure 2 2 2.8 V
with Load
R
L
= 27Ω, (RS485), See Figure 2 1.5 2.3 5 V
ΔV
OD
Change in Magnitude of Output R
L
= 27Ω or 50Ω
(3)
0.2 |V|
Differential Voltage
V
OD3
Differential Driver Output Voltage— R1 = 54Ω, R2 = 375Ω
1.5 2.0 5 V
Full Load with Max V
CM
V
TEST
= −7V to +12V, See Figure 6
V
OC
Driver Common-Mode Output Voltage R
L
= 27Ω or 50Ω, See Figure 2 3 V
ΔV
OC
Change in Magnitude of Common-Mode R
L
= 27Ω or 50Ω, See Figure 2
(3)
0.2 |V|
Output Voltage
V
IH
Input High Voltage DI, 2.0 V
DE,
V
IL
Input Low Voltage 0.8 V
RE*
I
IN1
Input Current V
IN
= 0V or V
CC
±2 μA
I
IN2
Input Current
(4)
V
IN
= +12V A, B 1.0 mA
DE = 0V, V
CC
= 0V or 5.25V
V
IN
= −7V −0.8 mA
V
TH
Receiver Differential Threshold Voltage −7V ≤ V
CM
≤ +12V −0.2 0.2 V
ΔV
TH
Receiver Input Hysteresis V
CM
= 0V 70 mV
V
OH
Receiver Output High Voltage I
O
= −4 mA, V
ID
= 0.2V RO 3.5 V
V
OL
Receiver Output Low Voltage I
O
= 4 mA, V
ID
= −0.2V 0.4 V
I
OZR
TRI-STATE Output Current at Receiver 0.4V ≤ V
O
≤ 2.4V ±1 μA
R
IN
Receiver Input Resistance −7V ≤ V
IN
≤ +12V A, B 12 kΩ
I
CC
No-Load Supply Current
(5)
DE = V
CC
, RE* = 0V or V
CC
V
CC
200 900 μA
DE = 0V, RE* = 0V or V
CC
200 500 μA
I
OSD1
Driver Short Circuit Current, V
O
= HIGH −7V ≤ V
O
≤ +12V A, B 35 250 mA
I
OSD2
Driver Short Circuit Current, V
O
= LOW −7V ≤ V
O
≤ +12V 35 250 mA
I
OSR
Receiver Short Circuit Current 0V ≤ V
O
≤ V
CC
RO 7 85 mA
(1) Current into device pins is defined as positive. Current out of device pins is defined as negative. All voltages are referenced to ground
except V
OD1/2/3
and V
ID
.
(2) All typicals are given for: V
CC
= +5.0V, T
A
= +25°C.
(3) Δ|V
OD
| and Δ|V
OC
| are changes in magnitude of V
OD
and V
OC
respectively, that occur when the input changes state.
(4) I
IN2
includes the receiver input current and driver TRI-STATE leakage current.
(5) Supply current specification is valid for loaded transmitters when DE = 0V or enabled (DE = H) with no load.
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