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SN75LBC784 Datasheet(PDF) 4 Page - Texas Instruments

Part No. SN75LBC784
Description  QUADRUPLE RS-423-B DRIVER/RECEIVER
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
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SN75LBC784 Datasheet(HTML) 4 Page - Texas Instruments

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SN75LBC784
QUADRUPLE RS-423-B DRIVER/RECEIVER
SLLS187A – NOVEMBER 1994 – REVISED AUGUST 1995
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
RECEIVER SECTION
electrical characteristics over recommended ranges of supply voltage and operating free-air
temperature, VDD = 10.8 V to 13.2 V, VSS = –10.8 V to –13.2 V, TA = 0°C to 70°C (unless otherwise
noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
VIT
Positive input threshold voltage
200
mV
VIT+
Positive input threshold voltage
With 500
Ω series resistor
400
mV
VIT
Negative input threshold voltage
– 200
mV
VIT–
Negative input threshold voltage
With 500
Ω series resistor
– 400
mV
II
Input current
VI = 10 V
Other input to GND
1.3
3.25
mA
II
Input current
VI = – 10 V
Other input to GND
– 3.25
– 1.3
mA
Vhys
Hysteresis (VIT + – VIT –)
20
40
150
mV
VOH
High level output voltage (see Note 2)
IO = –20 µA
3.5
5
V
VOH
High-level output voltage (see Note 2)
IO = – 4 mA
2.4
5
V
VOL
Low-level output voltage
IO = 20 µA to 4 mA
0.4
V
IRX
RX short circuit current
50
mA
VID
Differential input voltage
Receiver inputs open circuit
1.6
2.1
2.6
V
Vofs
Fail safe output voltage
See Note 3
3.5
V
NOTES:
2. Device has an internal RX supply regulator. Maximum RX logic output voltage under no load is thus defined by an internal voltage
value. This is nominally set to 4.5 V with a tolerance of
±5%.
3. One input at ground, other input open circuit, IO = –20 µA, or both open circuit.
switching characteristics over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted)
test conditions: VDD = 10.8 V to 13.2 V, VSS = –10.8 V to –13.2 V, TA = 0°C to 70°C (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
NOM
MAX
UNIT
tPLH
Propagation Delay time low-to-high (see Figure 2)
015
1
µs
tPHL
Propagation delay time high-to-low (see Figure 2)
CL =50 pF
0.15
1
µs
tTHL
Transition time high-to-low (see Figure 3)
CL = 50 pF
20
200
ns
tTLH
Transition time low-to-high (see Figure 3)
20
200
ns


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