MAX3291CSD datasheet(4/16 Pages) MAXIM

4 / 16 page

RS-485/RS-422 Transceivers with Preemphasis

for High-Speed, Long-Distance Communication

_______________________________________________________________________________________

SWITCHING CHARACTERISTICS (continued)

(Typical Operating Circuit, VCC = +5V ±5%, RPSET = 0 (MAX3292), VCC = VCCD (MAX3292), TA = +25°C, unless otherwise noted.

Typical values are at VCC = +5V and TA = +25°C.)

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 3: DPER is defined as (VODP / VOD).

Note 4:

∆VODP and ∆VOC are the changes in VDD and VOC, respectively, when the DI input changes. This specification reflects

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

Note 5:

∆VODP and ∆VOC are the changes in VOD and VOC, respectively, when the DI input changes state.

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

entered shutdown. Time to shutdown for the device (tSHDN) is measured by monitoring R0 as in Figure 4.

Figures 2 and 6, S2 closed, RL = 500Ω,

CL = 100pF

Figures 2 and 6, RL = 500Ω, CL = 100pF,

S2 closed

CONDITIONS

6000

8750

tDZH(SHDN)

Driver Enable from Shutdown

to Output High

UNITS

MIN

TYP

MAX

SYMBOL

PARAMETER

Figures 4 and 11 (Note 7)

160

500

tSHDN

Time to Shutdown

Figures 2 and 8, RL = 1kΩ, CL = 100pF,

S1 closed

343

tRZL

Receiver Enable to Output

Low

Figures 2 and 8, RL = 1kΩ, CL = 15pF,

S1 closed

Figures 2 and 8, RL = 1kΩ, CL = 100pF,

S2 closed

tRLZ

Receiver Disable Time from

Low

343

tRZH

Receiver Enable to Output

High

Figures 2 and 8, RL = 1kΩ, CL = 15pF,

S2 closed

tRHZ

Receiver Disable Time from

High

Figures 2 and 6, RL = 500Ω, CL = 100pF,

S1 closed

6000

8750

tDZL(SHDN)

Driver Enable from Shutdown

to Output Low

Figures 2 and 8, RL = 1kΩ, CL = 100pF,

S1 closed

1500

tRZL(SHDN)

Receiver Enable from

Shutdown to Output Low

Figures 2 and 8, RL = 1kΩ, CL = 100pF,

S2 closed

850

1500

tRZH(SHDN)

Receiver Enable from

Shutdown to Output High

Figures 7 and 9, CL = 100pF

tRSKEW

Receiver Output Skew

 tRPLH - tRPHL

Driver Enable to Output High

tDZH

105

Figures 7 and 9, CL = 50pF, VID = 2V,

VCM = 0

Receiver Propagation Delay

tRPHL

tRPLH

Figures 2 and 6, S2 closed, RL = 500Ω,

CL = 15pF

Driver Disable Time from High

tDHZ

100

Figures 2 and 6, S1 closed, RL = 500Ω,

CL = 15pF

Driver Disable Time from Low

tDLZ

100

Figures 2 and 6, S1 closed, RL = 500Ω,

CL = 100pF

Driver Enable to Output Low

tDZL

105

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