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LTC2873 bảng dữ liệu(PDF) 4 Page - Analog Devices

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Giải thích chi tiết về linh kiện  Single-Bus RS485/RS232 Multiprotocol Transceiver with Switchable Termination
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LTC2873
4
REV B
For more information www.analog.com
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VOH
Receiver Output High Voltage
Output High, I(RO) = –3mA (Sourcing),
3V ≤ VL ≤ 5.5V
l
VL – 0.4
V
Output High, I(RO) = –1mA (Sourcing),
1.7V ≤ VL < 3V
l
VL – 0.4
V
Three-State (High Impedance) Output Current (RO) 0V ≤ RO ≤ VL, VL = 5.5V, RE485 = VL
l
0
±5
µA
Short-Circuit Current (RO)
0V ≤ RO ≤ VL, VL = 5.5V
l
±135
mA
RTERM
Terminating Resistor
TE485 = 0V, VAB = 2V,
VB = –7V, 0V, 10V (Figure 8)
l
108
120
156
Ω
RS232 Driver
VOLD
Output Low Voltage
RL = 3kΩ, VEE ≤ –6V
l
–5
–5.5
VEE
V
VOHD
Output High Voltage
RL = 3kΩ, VDD ≥ 6.5V
l
5
5.9
VDD
V
Output Short-Circuit Current
Driver Output = 0V
l
±25
±90
mA
RS232 Receiver
Input Threshold Voltage
l
0.6
1.5
2.5
V
Input Hysteresis
l
0.1
0.4
1.0
V
Output Low Voltage
I(RO) = 1mA (Sinking), 1.7V ≤ VL < 5.5V
l
0.4
V
Output High Voltage
I(RO) = –1mA (Sourcing), 1.7V ≤ VL < 5.5V
l
VL – 0.4
V
Input Resistance
–15V ≤ B/RI ≤ 15V, 485/232 = 0V
l
3
5
7
Output Short-Circuit Current
VL = 5.5V, 0V ≤ RO ≤ VL
l
±25
±50
mA
Logic Inputs
Threshold Voltage
l
0.4
0.75 • VL
V
Input Current
l
0
±5
µA
ESD
Interface Pins (A/DO, B/RI)
Human Body Model to GND or VCC, Powered
or Unpowered (Note 5)
±26
kV
All Other Pins
Human Body Model (Note 5)
±4
kV
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = VL = 3.3V, TE485 = VL, LB = 0V unless otherwise noted. (Notes 2, 6)
ELECTRICAL CHARACTERISTICS


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