RS-485/RS-422 Transceivers with Preemphasis

for High-Speed, Long-Distance Communication

4

_______________________________________________________________________________________

SWITCHING CHARACTERISTICS (continued)

Note 1: All currents into the device are positive; all currents out of the device are negative. All voltages are referenced to device

ground unless otherwise noted.

Note 2: Guaranteed by design.

Note 4:

constant operating conditions. When operating conditions shift, the maximum value may be momentarily exceeded.

Note 5:

Note 6: Maximum current level applies to peak current just prior to foldback-current limiting; minimum current level applies during

current limiting.

Note 7: Shutdown is enabled by bringing RE high and DE low. If the enable inputs are in this state for less than 50ns, the device is

guaranteed not to enter shutdown. If the enable inputs are in this state for at least 500ns, the device is guaranteed to have

S2 closed

CONDITIONS

ns

ns

6000

8750

Driver Enable from Shutdown

to Output High

UNITS

MIN

TYP

MAX

SYMBOL

PARAMETER

Figures 4 and 11 (Note 7)

ns

50

160

500

Time to Shutdown

S1 closed

ns

343

55

Receiver Enable to Output

Low

S1 closed

ns

S2 closed

25

45

Receiver Disable Time from

Low

ns

343

55

Receiver Enable to Output

High

S2 closed

ns

25

45

Receiver Disable Time from

High

S1 closed

ns

6000

8750

Driver Enable from Shutdown

to Output Low

S1 closed

ns

30

1500

Receiver Enable from

Shutdown to Output Low

S2 closed

ns

850

1500

Receiver Enable from

Shutdown to Output High

ns

3

Receiver Output Skew

Driver Enable to Output High

72

105

Receiver Propagation Delay

52

85

ns

49

85

Driver Disable Time from High

71

100

ns

Driver Disable Time from Low

53

100

ns

Driver Enable to Output Low

55

105

ns