SN75LBC786

QUADRUPLE RS-423-B DRIVER/RECEIVER WITH LOOPBACK

SLLS184 – NOVEMBER 1994

4

POST OFFICE BOX 655303

RECEIVER SECTION

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

temperature (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

VIT

Receiver input threshold voltage

VIT = (VI+ – VI–)

– 200

200

mV

VIT

g

(see Figure 5)

VIT = (VI+ – VI–) with 500-Ω series resistor

– 400

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 voltage

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

IOS

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