MAX3440E–MAX3444E
±15kV ESD-Protected, ±60V Fault-Protected,
10Mbps, Fail-Safe RS-485/J1708 Transceivers
Test Circuits and Waveforms (continued)
1.5V
-1.5V
S3
A
VID R
RO
B
GENERATOR
(NOTE 4)
50Ω
1kΩ
CL = 20pF
(NOTE 5)
S1
VCC
S2
3V
S1 OPEN
RE
1.5V
S2 CLOSED
RE
tRPZH
tRPSH
tRPWAKE
0
VS3 = 1.5V
VOH
RO
1.5V
RO
0
RE
RO 0.5V
1.5V
tRPHZ
3V
S1 OPEN
S2 CLOSED
RE
0
VS3 = 1.5V
VOH
RO
0
1.5V
tRPZL
tRPSL
1.5V
1.5V
tRPLZ
0.5V
3V
S1 CLOSED
S2 OPEN
0 VS3 = -1.5V
VCC
VOL
3V
S1 CLOSED
S2 OPEN
0 VS3 = -1.5V
VCC
VOL
Figure 8. Receiver Enable and Disable Times
Note 4: The input pulse is supplied by a generator with the following characteristics: f = 5MHz, 50% duty cycle; tr ≤ 6ns; Z0 = 50Ω.
Note 5: CL includes probe and stray capacitance.
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