LT1785 查看數據表（PDF） - Linear Technology
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LT1785 Datasheet PDF : 16 Pages
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LT1785/LT1785A/
LT1791/LT1791A
DC ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C, VCC = 5V.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VOD1 Differential Driver Output Voltage (Unloaded)
IO = 0
l
4.1
5
V
VOD2 Differential Driver Output Voltage (With Load)
R = 50Ω (RS422), Figure 1
l 2.0
2.70
V
R = 27Ω (RS485), Figure 1
l 1.5
2.45
V
R = 18Ω
l 1.2
2.2
V
VOD
Change in Magnitude of Driver Differential Output
R = 27Ω or R = 50Ω, Figure 1
l
Voltage for Complementary Output States
0.2
V
VOC
Driver Common Mode Output Voltage
R = 27Ω or R = 50Ω, Figure 1
l
2
2.5
3
V
Δ|VOC| Change in Magnitude of Driver Common Mode Output R = 27Ω or R = 50Ω, Figure 1
l
Voltage for Complementary Output States
0.2
V
VIH
Input High Voltage
VIL
Input Low Voltage
IIN1
Input Current
DI, DE, RE
DI, DE, RE
DI, DE, RE
l
2
l
l
V
0.8
V
5
μA
IIN2
Input Current (A, B); (LT1791 or LT1785 with DE = 0V) VIN = 12V
VIN = –7V
–60V ≤ VIN ≤ 60V
l
0.15
0.3
mA
l –0.15 –0.08
mA
l –6
6
mA
VTH
Differential Input Threshold Voltage for Receiver
LT1785/LT1791: –7V ≤ VCM ≤ 12V l –0.2
LT1785A/LT1791A: –7V ≤ VCM ≤ 12V l –0.2
0.2
V
0
V
ΔVTH Receiver Input Hysteresis
–7V < VCM < 12V
20
mV
VOH
Receiver Output High Voltage
IO = –400μA, VID = 200mV
l 3.5
4
V
VOL
Receiver Output Low Voltage
Three-State (High Impedance) Output Current at
Receiver 0V < VOUT < 6V
IO = 1.6mA, VID = –200mV
RE > 2V or Power Off
l
0.3
0.5
V
l –1
1
μA
RIN
Receiver Input Resistance (LT1791)
–7V ≤ VCM ≤ 12V
l 85
125
kΩ
– 60V ≤ VCM ≤ 60V
125
kΩ
LT1785
–7V ≤ VCM ≤ 12V
l 50
90
kΩ
RS485 Unit Load
0.25
ISC
Driver Short-Circuit Current
Driver Output Fault Current
Receiver Short-Circuit Current
Driver Three-State Output Current
ICC
Supply Current
VOUT = HIGH, Force VO = –7V
VOUT = LOW, Force VO = 12V
VO = 60V
VO = –60V
0V ≤ VO ≤ VCC
–7V ≤ VO ≤ 12V
–60V ≤ VO ≤ 60V
No Load, RE = 0V, DE = 5V
No Load, RE = 5V, DE = 5V
No Load, RE = 0V, DE = 0V
No Load, RE = 5V, DE = 0V
l 35
l 35
250
mA
250
mA
l
l –6
6
mA
mA
l
±35
mA
l –0.2
l –6
0.3
mA
6
mA
l
5.5
9
mA
l
5.5
9
mA
l
4.5
8
mA
l
0.2
0.3
mA
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