Datasheet

DS36C278
www.ti.com SNLS096C –JULY 1998–REVISED APRIL 2013
Recommended Operating Conditions
Min Typ Max Units
Supply Voltage (V
CC
) +4.75 +5.0 +5.25 V
Bus Voltage −7 +12 V
Operating Free-Air Temperature (T
A
)
DS36C278T −40 25 +85 °C
DS36C278 0 25 +70 °C
Electrical Characteristics
(1) (2)
Over Supply Voltage and Operating Temperature ranges, unless otherwise specified
Parameter Test Conditions Reference Min Typ Max Units
DIFFERENTIAL DRIVER CHARACTERISTICS
V
OD1
Differential Output Voltage I
O
= 0 mA (No Load) 1.5 5.0 V
(422)
V
OD0
Output Voltage I
O
= 0 mA 0 5.0 V
(485)
V
OD0*
Output Voltage (Output to GND) 0 5.0 V
V
OD2
Differential Output Voltage R
L
= 50Ω (422) Figure 2 2.0 2.8 V
(Termination Load) R
L
= 27Ω (485) 1.5 2.3 5.0 V
ΔV
OD2
Balance of V
OD2
R
L
= 27Ω or 50Ω
(3)
−0.2 0.1 +0.2 V
|V
OD2
− V
0D2*
| (422, 485)
V
OD3
Differential Output Voltage R1 = 54Ω, R2 = 375Ω
Figure 3 1.5 2.0 5.0 V
(Full Load) V
TEST
= −7V to +12V
V
OC
Driver Common Mode R
L
= 27Ω (485) 0 3.0 V
Figure 2
Output Voltage
R
L
= 50Ω (422) 0 3.0 V
ΔV
OC
Balance of V
OC
R
L
= 27Ω or
(3)
−0.2 +0.2 V
|V
OC
− V
OC*
| R
L
= 50Ω (422, 485)
I
OSD
Driver Output Short-Circuit V
O
= +12V (485) 200 +250 mA
Current
V
O
= −7V (485) −190 −250 mA
RECEIVER CHARACTERISTICS
V
TH
Differential Input High V
O
= V
OH
, I
O
= −0.4V
+0.035 +0.2 V
Threshold Voltage −7V ≤ V
CM
≤ +12V
(4)
(422, 485)
V
TL
Differential Input Low V
O
= V
OL
, I
O
= 0.4 mA
−0.2 −0.035 V
Threshold Voltage −7V ≤ V
CM
≤ +12V
V
HST
Hysteresis V
CM
= 0V
(5)
70 mV
R
IN
Input Resistance −7V ≤ V
CM
≤ +12V DS36C278T 24 68 kΩ
R
IN
Input Resistance −7V ≤ V
CM
≤ +12V DS36C278 48 68 kΩ
I
IN
Line Input Current Other Input = 0V, DS36C278 V
IN
= +12V 0 0.19 0.25 mA
(6)
DE = V
IL
, RE* = V
IL
, V
IN
= −7V 0 −0.1 −0.2 mA
V
CC
= 4.75 to 5.25 DS36C278T V
IN
= +12V 0 0.19 0.5 mA
or 0V V
IN
= −7V 0 −0.1 −0.4 mA
I
ING
Line Input Current Glitch Other Input = 0V, DS36C278 V
IN
= +12V 0 0.19 0.25 mA
(6)
DE = V
IL
, RE* = V
IL
, V
IN
= −7V 0 −0.1 −0.2 mA
V
CC
= +3.0V or 0V, DS36C278T V
IN
= +12V 0 0.19 0.5 mA
T
A
= 25°C V
IN
= −7V 0 −0.1 −0.4 mA
I
B
Input Balance Test RS = 500Ω (422)
(7)
±400 mV
(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
and V
OD2
.
(2) All typicals are given for: V
CC
= +5.0V, T
A
= + 25°C.
(3) Delta |V
OD2
| and Delta |V
OC
| are changes in magnitude of V
OD2
and V
OC
, respectively, that occur when input changes state.
(4) Threshold parameter limits specified as an algebraic value rather than by magnitude.
(5) Hysteresis defined as V
HST
= V
TH
− V
TL
.
(6) I
IN
includes the receiver input current and driver TRI-STATE leakage current.
(7) For complete details of test, see RS-485.
Copyright © 1998–2013, Texas Instruments Incorporated Submit Documentation Feedback 3
Product Folder Links: DS36C278