LTC2873H Просмотр технического описания (PDF) - Analog Devices
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LTC2873H Datasheet PDF : 32 Pages
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LTC2873
ELECTRICAL CHARACTERISTICS 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)
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX
VOH
Receiver Output High Voltage
RTERM
Three-State (High Impedance) Output Current (RO)
Short-Circuit Current (RO)
Terminating Resistor
RS232 Driver
Output High, I(RO) = –3mA (Sourcing),
3V ≤ VL ≤ 5.5V
Output High, I(RO) = –1mA (Sourcing),
1.7V ≤ VL < 3V
0V ≤ RO ≤ VL, VL = 5.5V, RE485 = VL
0V ≤ RO ≤ VL, VL = 5.5V
TE485 = 0V, VAB = 2V,
VB = –7V, 0V, 10V (Figure 8)
l VL – 0.4
l VL – 0.4
l
0
±5
l
±135
l 108 120
156
VOLD
Output Low Voltage
VOHD
Output High Voltage
Output Short-Circuit Current
RL = 3kΩ, VEE ≤ –6V
RL = 3kΩ, VDD ≥ 6.5V
Driver Output = 0V
l –5
–5.5
VEE
l5
5.9
VDD
l
±25
±90
RS232 Receiver
Input Threshold Voltage
l 0.6
1.5
2.5
Input Hysteresis
l 0.1
0.4
1.0
Output Low Voltage
Output High Voltage
Input Resistance
I(RO) = 1mA (Sinking), 1.7V ≤ VL < 5.5V
l
0.4
I(RO) = –1mA (Sourcing), 1.7V ≤ VL < 5.5V l VL – 0.4
–15V ≤ B/RI ≤ 15V, 485/232 = 0V
l3
5
7
Output Short-Circuit Current
Logic Inputs
VL = 5.5V, 0V ≤ RO ≤ VL
l
±25
±50
Threshold Voltage
Input Current
l 0.4
l
0.75 • VL
0
±5
ESD
Interface Pins (A/DO, B/RI)
Human Body Model to GND or VCC, Powered
±26
or Unpowered (Note 5)
All Other Pins
Human Body Model (Note 5)
±4
UNITS
V
V
µA
mA
Ω
V
V
mA
V
V
V
V
kΩ
mA
V
µA
kV
kV
REV B
4
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