SN65LBC174A, SN75LBC174A

QUADRUPLE RS485 DIFFERENTIAL LINE DRIVERS

SLLS446C − OCTOBER 2000 − REVISED MAY 2003

5

POST OFFICE BOX 655303

switching characteristics over recommended operating conditions

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

tPLH

Propagation delay time, low-to-high level output

5.5

8

11

ns

tPHL

Propagation delay time, high-to-low level output

5.5

8

11

ns

tr

Differential output voltage rise time

3

7.5

11

ns

tf

Differential output voltage fall time

RL = 54 Ω, CL = 50 pF,

3

7.5

11

ns

tsk(p)

Pulse skew |tPLH – tPHL|

RL = 54 Ω, CL = 50 pF,

See Figure 4

0.6

2

ns

tsk(p)

Pulse skew |tPLH – tPHL|

See Figure 4

0.6

2

ns

tsk(o)

Output skew†

2

ns

tsk(pp) Part-to-part skew‡

3

ns

tPZH

Propagation delay time, high-impedance-to-high-level output

See Figure 5

25

ns

tPHZ

Propagation delay time, high-level-output-to-high impedance

See Figure 5

25

ns

tPZL

Propagation delay time, high-impedance-to-low-level output

See Figure 6

30

ns

tPLZ

Propagation delay time, low-level-output-to-high impedance

See Figure 6

20

ns

† Output skew (tsk(o)) is the magnitude of the time delay difference between the outputs of a single device with all of the inputs connected together.

‡ Part-to-part skew (tsk(pp)) is the magnitude of the difference in propagation delay times between any specified terminals of two devices when

both devices operate with the same input signals, the same supply voltages, at the same temperature, and have identical packages and test

circuits.