ADM2485 Ver la hoja de datos (PDF) - Analog Devices
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ADM2485 Datasheet PDF : 20 Pages
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ADM2485
TIMING SPECIFICATIONS
2.7 V ≤ VDD1 ≤ 5.5 V, 4.75 V ≤ VDD2 ≤ 5.25 V, TA = TMIN to TMAX, unless otherwise noted.
Table 2.
Parameter
DRIVER
Maximum Data Rate
Propagation Delay Input-to-Output
tPLH, tPHL
RTS-to-DE OUT Propagation Delay
Driver Output-to-Output, tSKEW
Rise/Fall Time, tR, tF
Enable Time
Disable Time
Enable Skew, |tAZH − tBZL|, |tAZL − tBZH|
Disable Skew, |tAHZ − tBLZ|, |tALZ − tBHZ|
RECEIVER
Propagation Delay, tPLH, tPHL
Differential Skew, tSKEW
Enable Time
Disable Time
Min Typ Max Unit Test Conditions/Comments
16
Mbps
25 45 55 ns
20 35 55 ns
25
ns
5 15 ns
43 53 ns
43 55 ns
13
ns
25
ns
RLDIFF = 54 Ω, CL1 = CL2 = 100 pF, see Figure 25
See Figure 26
RLDIFF = 54 Ω, CL1 = CL2 = 100 pF, see Figure 2 and Figure 25
RLDIFF = 54 Ω, CL1 = CL2 = 100 pF, see Figure 2 and Figure 25
See Figure 4 and Figure 27
See Figure 4 and Figure 27
See Figure 4 and Figure 27
See Figure 4 and Figure 27
25 45 55 ns
5
ns
3 13 ns
3 13 ns
CL = 15 pF, see Figure 3 and Figure 28
CL = 15 pF, see Figure 3 and Figure 28
RL = 1 kΩ, CL = 15 pF, see Figure 5 and Figure 29
RL = 1 kΩ, CL = 15 pF, see Figure 5 and Figure 29
Timing Diagrams
3V
1.5V
0V
B
1/2VOUT
VOUT
tPLH
A
+VOUT
0V
–VOUT
90% POINT
10% POINT
tR
1.5V
tPHL
tSKEW = |tPLH – tPHL|
90% POINT
10% POINT
tF
Figure 2. Driver Propagation Delay, Rise/Fall Timing
A–B
RxD
0V
0V
tPLH
tPHL
VOH
1.5V
tSKEW = |tPLH – tPHL|
1.5V
VOL
Figure 3. Receiver Propagation Delay
RTS
A–B
A–B
RE
RxD
RxD
0V
0.5VDD1
tZL
0.5VDD1
tLZ
0.7VDD1
0.3VDD1
2.3V
tZH
2.3V
VOH + 0.5V
VOL
tHZ
VOH – 0.5V
VOH
0V
Figure 4. Driver Enable/Disable Timing
0.5VDD1
tZL
0.5VDD1
tLZ
0.7VDD1
0.3VDD1
1.5V
OUTPUT LOW
tZH
OUTPUT HIGH
1.5V
VOH + 0.5V
VOL
tHZ
VOH
VOH – 0.5V
Figure 5. Receiver Enable/Disable Timing
Rev. A | Page 5 of 20
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