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ADM1491EBRZ Datasheet(PDF) 4 Page - Analog Devices

No. de pieza ADM1491EBRZ
Descripción Electrónicos  16 Mbps, ESD Protected, Full-Duplex RS-485 Transceivers
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Fabricante Electrónico  AD [Analog Devices]
Página de inicio  http://www.analog.com
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ADM1491EBRZ Datasheet(HTML) 4 Page - Analog Devices

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ADM1491E
Rev. 0 | Page 4 of 16
TIMING SPECIFICATIONS
TA = −40°C to +85°C.
Table 2.
Parameter
Symbol
Min
Typ
Max
Unit
Test Conditions
DRIVER
Maximum Data Rate
16
Mbps
Propagation Delay
tDPLH, tDPHL
11
17
ns
RL = 54 Ω, CL = 100 pF, see Figure 21 and Figure 2
Driver Output Skew
tSKEW
0.5
2
ns
RL = 54 Ω, CL = 100 pF, see Figure 21 and Figure 2,
tSKEW = |tDPLH − tDPHL|
Rise Time/Fall Time
tDR, tDF
8
15
ns
RL = 54 Ω, CL = 100 pF, see Figure 21 and Figure 2
Enable Time
tZH, tZL
20
ns
RL = 110 Ω, CL = 50 pF, see Figure 22 and Figure 4
Disable Time
tHZ, tLZ
20
ns
RL = 110 Ω, CL = 50 pF, see Figure 22 and Figure 4
RECEIVER
Propagation Delay
tPLH, tPHL
12
20
ns
CL = 15 pF, see Figure 23 and Figure 3
Skew |tPLH − tPHL|
tSKEW
0.4
2
ns
CL = 15 pF, see Figure 23 and Figure 3
Enable Time
tZH, tZL
13
ns
RL = 1 kΩ, CL = 15 pF, see Figure 24 and Figure 5
Disable Time
tHZ, tLZ
13
ns
RL = 1 kΩ, CL = 15 pF, see Figure 24 and Figure 5
Timing Diagrams
Switching Characteristics
DE
Y, Z
Y, Z
VCC
0V
0V
VOL
VOH
0.5VCC
0.5VCC
tZL
tLZ
tZH
tHZ
VOL + 0.5V
VOH – 0.5V
2.3V
2.3V
Z
Y
VCC/2
VCC/2
tDPLH
tDPHL
1/2VO
VO
90% POINT
10% POINT
10% POINT
90% POINT
VDIFF = V(Y) – V(Z)
tDR
tDF
–VO
VDIFF
+VO
0V
VCC
Figure 4. Driver Enable/Disable Timing
Figure 2. Driver Propagation Delay Rise/Fall Timing
A – B
RO
0V
0V
1.5V
1.5V
VOH
VOL
tPLH
tPHL
tSKEW =|tPLH tPHL|
OUTPUT LOW
OUTPUT HIGH
1.5V
1.5V
RO
RO
RE
0V
0.7VCC
0.3VCC
VOL
VOH
0.5VCC
0.5VCC
tZL
tLZ
tZH
tHZ
VOL + 0.5V
VOH –0.5V
Figure 5. Receiver Enable/Disable Timing
Figure 3. Receiver Propagation Delay Timing


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