SN75LBC784

QUADRUPLE RS-423-B DRIVER/RECEIVER

SLLS187A – NOVEMBER 1994 – REVISED AUGUST 1995

4

POST OFFICE BOX 655303

RECEIVER SECTION

electrical characteristics over recommended ranges of supply voltage and operating free-air

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)

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