UM3487E Datasheet, PDF (9/14 Pages) Union Semiconductor, Inc. – ±15kV ESD-Protected, Fail-Safe, Hot-Swappable Auto Polarity Reversal RS-485 Transceivers

UM3487E
B
ATE
V_D
R ^Receiver
Output
A
Figure 6. Receiver Propagation Delay Test Circuit
3V
1.5V
DI 0V
L1
VO
L2
VO
tDPLH
90%
1/2VO
VDIFF 0V
10%
-VO
tDR
VDIFF = VL1 - VL2
tSKEW=|tDPLH-tDPHL|
1.5V
tDPHL
1/2VO
90%
10%
tDF
Figure 7. Driver Propagation Delays
3V
1.5V
DE 0V
L1 VOH
VOL
VOH
L2 ^VOL
1.5V
tDZL(SHDN), tDZL
tDLZ
1.4V
Output Normally Low
VOL+0.5V
Output Normally High
1.4V
tDZH(SHDN), tDZH
tDHZ
VOH-0.5V
Figure 8. Driver Enable and Disable Times
VOH
RO
VOL
L2 1V
L1 -1V
1.5V
tRPHL
OUTPUT
INPUT
1.5V
tRPLH
Figure 9. Receiver Propagation Delays
3V
RE
1.5V
0V
VOH
RO
VOL
1.5V
tRZL(SHDN), tRZL
tRLZ
1.5V
Output Normally Low
Output Normally High
1.5V
VOL+0.5V
VOH-0.5V
tRZH(SHDN), tRZH
tRHZ
Figure 10. Receiver Enable and Disable Times
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http://www.union-ic.com Rev.02 Jan.2014
9/14