SN55LBC176, SN65LBC176, SN65LBC176Q, SN75LBC176

DIFFERENTIAL BUS TRANSCEIVERS

SLLS067H − AUGUST 1990 − REVISED DECEMBER 2010

7

POST OFFICE BOX 655303

RECEIVER SECTION

electrical characteristics over recommended ranges of common-mode input voltage, supply

voltage, and operating free-air temperature (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

MAX

UNIT

Positive-going input threshold

voltage

0.2

V

Negative-going input threshold

voltage

V

(see Figure 4)

50

mV

Enable-input clamp voltage

−1.5

V

V

High level output voltage

27

V

High-level output voltage

See Figure 6

2.7

V

V

Low level output voltage

045

V

Low-level output voltage

See Figure 6

0.45

V

High-impedance-state output

current

−20

20

μA

I

Line input current

1

mA

Line input current

Other input = 0 V,

See Note 5

−0.8

mA

High-level enable-input current

−100

μA

Low-level enable-input current

−100

μA

Input resistance

12

kΩ

Receiver enabled

and driver disabled

3.9

mA

Supply current

No load

Ri

d

SN55LBC176,

SN65LBC176

025

Supply current

No load

Receiver and

driver disabled

SN65LBC176,

SN65LBC176Q

0.25

mA

driver disabled

SN75LBC176

0.2

NOTE 5: This applies for both power on and power off. Refer to ANSI Standard RS-485 for exact conditions.

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

PARAMETER

TEST CONDITIONS

SN55LBC176

SN65LBC176Q

SN65LBC176

SN75LBC176

UNIT

PARAMETER

TEST CONDITIONS

MIN

MAX

MIN

MAX

UNIT

Propagation delay time, low- to high-level

single-ended output

V

15 V t 15 V

11

37

11

33

ns

Propagation delay time, high- to low-level

single-ended output

See Figure 7

11

37

11

33

ns

10

3

6

ns

Output enable time to high level

See Figure 8

35

35

ns

Output enable time to low level

See Figure 8

35

30

ns

Output disable time from high level

See Figure 8

35

35

ns

Output disable time from low level

See Figure 8

35

30

ns