MAX3480A データシートの表示（PDF） - Maxim Integrated
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MAX3480A Datasheet PDF : 16 Pages
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Complete, Isolated, 3.3V
RS-485/RS-422 Data Interface
_________________________________________________________________Test Circuits
A
VOD
B
R
R
VOC
ISOLATION BARRIER
3.3V
DE´
A
DI´
D
VID
B
ISOLATION BARRIER
3.3V
CL1
A
R3
RDIFF
R
RO
B
CL2
Figure 3. Driver DC Test Load
Figure 4. Driver/Receiver Timing Test Circuit
OUTPUT
UNDER TEST
500Ω
CL
ISO VCC1,
S1
ISO VCC2
S2
Figure 5. Driver Timing Test Load
_______________________________________________________Switching Waveforms
VCC_ - 0.4V
´ VCC_ - 0.4V
DI
2
0V
B
A
VDIFF
VO
0V
-VO
VO
1/2 VO
10%
tR
VCC_ - 0.4V
2
tPLH
tPHL
1/2 VO
VDIFF = VA - VB
90%
90%
10%
tF
tSKEW = | tPLH - tPHL |
Figure 6. Driver Propagation Delays and Transition Times
VCC_ - 0.4V
DE´
VCC_ - 0.4V
2
0V
A, B
VOL
A, B
0V
VCC_ - 0.4V
2
tZL
tLZ
2.3V OUTPUT NORMALLY LOW
OUTPUT NORMALLY HIGH
2.3V
tZH
tHZ
VOL + 0.5V
VOH - 0.5V
Figure 7. Driver Enable and Disable Times
______________________________________________________________________________________ 11
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