SP3490EP Просмотр технического описания (PDF) - Exar Corporation
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SP3490EP Datasheet PDF : 12 Pages
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Test Circuits
D
Vcc
R
VOD
R
VOC
Figure 1: Driver DC Test Load Circuit
CL
D
GENERATOR
(NOTE 1)
50Ω
VCC
RL = OUT
60Ω
C L= 15pF (NOTE 2)
Figure 3: Driver Differential Output Delay and
Transition Time Circuit.
S1
0V OR 3V
D
GENERATOR
(NOTE 1)
50Ω
C L = 50pF
(NOTE 2)
VCC
RL = 110Ω
OUT
Figure 5: Driver Enable and Disable Timing Circuit,
Output Low
1.5V
-1.5V
S3
VID
R
GENERATOR
(NOTE 1)
50Ω
1k
C L= 15pF
(NOTE 2)
S1
VCC
S2
Figure 7: Receiver Enable and Disable Timing Circuit
SP3490 / SP3491
VDM
S1
D
GENERATOR
(NOTE 1)
50Ω
VCC
R L = 27Ω
OUT
C L = 15pF
(NOTE 2)
VOM =
VOH + VOL
2
≈ 1.5V
Figure 2: Driver Propagation Delay Test Circuit
GENERATOR
(NOTE 1)
S1
D
CL = 50pF
(NOTE 2)
50Ω
OUT
RL = 110Ω
VOM =
VOH + VOL
2
≈
1.5V
Figure 4: Driver Enable and Disable Timing Circuit,
Output High
GENERATOR
(NOTE 1)
V ID
R
50Ω
OUT
CL = 15pF
(NOTE 2)
1.5V
0V
VOM = VCC
2
Figure 6: Receiver Propagation Delay Test Circuit
DE = 0 or Vcc
A/Y
DI = 0 or Vcc
D
B/Z
IOS D
100Ω
-7V to +12V V
Figure 8: Driver Short Circuit Current Limit Test
REV 1.0.3
7/12
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