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
R
RE
GENERATOR
50Ω
1kΩ
C_L= 15pF
S1
Vcc
S2
Receiver Enable and DisableTiming Diagram
S1 is open, S2 is closed, S3 = 1.5V
3V
RE
1.5V
t t ZH, ZH(SHDN)
VOH
OUT
VOH /2
0V
S1 is closed, S2 is open, S3 = -1.5V
3V
RE
1.5V
0V
t t ZL, ZL(SHDN)
VCC
OUT
VOL= VCC /2
VOL
S1 is open, S2 is closed, S3 = 1.5V
3V
RE
1.5V
t_HZ
0.25V
VOH
OUT
0V
S1 is closed, S2 is open, S3 = -1.5V
RE
1.5V
t LZ
3V
0V
VCC
OUT
0.25V
VOL
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
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SP1486E_100_061009