SP1486E Datasheet, PDF (11/15 Pages) Sipex Corporation – +5V, 20Mbps PROFIBUS RS485/RS422 Transceivers Advanced Failsafe, 1/8th Unit Load, ±15kV ESD-Protected

Receiver Enable and Disable Times Test Circuit
DESCRIPTION
1.5V
-1.5V
S3
B
A
S1
1KΩ
S2
RE
CL=15pF
GENERATOR
50Ω
VCC
Receiver Enable and DisableTiming Diagram
S1 is open, S2 is closed, S3=1.5V
3V
1.5V
RE
tZH, tZH(SHDN)
OUT
VOH
VOH/2
0V
S1 is closed, S2 is open, S3= -1.5V
3V
RE
1.5V
0V
tZL, tZL(SHDN)
OUT
VOL = VCC/2
VCC
VOL
S1 is open, S2 is closed, S3=1.5V
3V
1.5V
RE
0.25V
VOH
OUT
0V
S1 is closed, S2 is open, S3= -1.5V
RE
1.5V
tLZ
3V
0V
OUT
0.25V
VCC
VOL
Rev J 3/8/2007
SP1486E PROFIBUS/RS485 Transceivers
11
© Copyright 2007 Sipex Corporation