MAX14780E_11 Datasheet, PDF (6/14 Pages) Maxim Integrated Products – 5.0V, 30kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceiver

+5.0V, ±30kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceiver
Test Circuits and Waveforms (continued)
B
RECEIVER
ATE
VID
OUTPUT
R
A
Figure 6. Receiver Propagation Delay Test Circuit
A
B
t_RPLH
V_OH
VOL ^VCC/2
RO
THE RISE TIME AND FALL TIME OF INPUTS A AND B < 4ns
Figure 7. Receiver Propagation Delays
+1V
-1V
tRPHL
+1.5V
S3
-1.5V
VID
1kΩ
CL
15pF
S1
V_CC
S2
GENERATOR
50Ω
S1 OPEN
S2 CLOSED
VS3 = +1.5V
V_CC
RE
RE
0
tRZH, tRZH(SHDN)
V_OH
RO
VOH / 2
RO
0
S1 CLOSED
S2 OPEN
VS3 = -1.5V
V_CC
VCC/2
0
tRZL, tRZL(SHDN)
VCC
(VOL + VCC)/2
V_OL
S1 OPEN
S2 CLOSED
VS3 = +1.5V
RE
50%
VCC/2
t_RHZ
10%
0.25V
RO
S1 CLOSED
S2 OPEN
VCC
V_S3 = -1.5V
VCC
50%
V_CC/2
0
RE
0
t_RLZ
V_CC
V_OH
0
RO 10%
0.25V
V_OL
Figure 8. Receiver Enable and Disable Times
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