XR5487EID-F Просмотр технического описания (PDF) - Exar Corporation

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XR5487EID-F

ULTRA HIGH SPEED RS-485/RS-422 PROFIBUS TRANSCEIVERS WITH 1/8TH UNIT LOAD AND +/-15KV ESD-PROTECTION

Exar Corporation 

XR5486E-5488E

REV. 1.0.0

ULTRA HIGH SPEED RS-485/RS-422 PROFIBUS TRANSCEIVERS WITH 1/8TH UNIT LOAD AND +/-15KV ESD-PROTECTION

FIGURE 6. DRIVER PROPAGATION DELAY TEST CIRCUIT

Y

DI D

VOD

Z

3.3V

RL

CL

54Ω 50pF

FIGURE 7. DRIVER PROPAGATION DELAY TIMING DIAGRAM

Vcc

DI

0V

Z

Y

VDIFF

VY – VZ

VO+

0V

VO–

Vcc/2

VO 1/2VO

tPLH

tPHL

Vcc/2

1/2VO

tDPLH

90%

10%

tR

tDPHL

t SKEW = |t DPLH - tDPHL|

90%

10%

tF

FIGURE 8. DRIVER ENABLE AND DISABLE TIME TEST CIRCUIT 1

0 or Vcc DI

Y

D

Z

S1

CL = 50pF

GENERATOR

50Ω

OUT

RL = 500Ω

9

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