Datasheet

ADM1490E/ADM1491E Data Sheet
Rev. D | Page 4 of 16
TIMING SPECIFICATIONS
T
A
= −40°C to +85°C.
Table 2.
Parameter Symbol Min Typ Max Unit Test Conditions/Comments
DRIVER
Maximum Data Rate 16 Mbps
Propagation Delay t
DPLH
, t
DPHL
11 17 ns R
L
= 54 Ω, C
L
= 100 pF, see Figure 23 and Figure 3
Driver Output Skew t
SKEW
0.5 2 ns R
L
= 54 Ω, C
L
= 100 pF, see Figure 23 and Figure 3,
t
SKEW
= |t
DPLH
− t
DPHL
|
Rise Time/Fall Time
t
DR
, t
DF
8
15
ns
R
L
= 54 Ω, C
L
= 100 pF, see Figure 23 and Figure 3
Enable Time t
ZH
, t
ZL
20 ns R
L
= 110 Ω, C
L
= 50 pF, see Figure 24 and Figure 5
Disable Time t
HZ
, t
LZ
20 ns R
L
= 110 Ω, C
L
= 50 pF, see Figure 24 and Figure 5
RECEIVER
Propagation Delay t
PLH
, t
PHL
12 20 ns C
L
= 15 pF, see Figure 25 and Figure 4
Skew |t
PLH
− t
PHL
| t
SKEW
0.4 2 ns C
L
= 15 pF, see Figure 25 and Figure 4
Enable Time t
ZH
, t
ZL
13 ns R
L
= 1 kΩ, C
L
= 15 pF, see Figure 26 and Figure 6
Disable Time t
HZ
, t
LZ
13 ns R
L
= 1 kΩ, C
L
= 15 pF, see Figure 26 and Figure 6
Timing Diagrams
Switching Characteristics
Z
Y
V
CC
/2 V
CC
/2
t
DPLH
t
DPHL
1/2V
O
V
O
90% POINT
10% POINT 10% POINT
90% POINT
V
DIFF
= V
(Y)
– V
(Z)
t
DR
t
DF
–V
O
V
DIFF
+V
O
0V
V
CC
07430-009
Figure 3. Driver Propagation Delay Rise/Fall Timing
A – B
RO
0V 0V
1.5V 1.5V
V
OH
V
OL
t
PLH
t
PHL
t
SKEW
= |
t
PLH
– t
PHL
|
07430-010
Figure 4. Receiver Propagation Delay Timing
DE
Y, Z
Y, Z
V
CC
0V
0V
V
OL
V
OH
0.5V
CC
0.5V
CC
t
ZL
t
LZ
t
ZH
t
HZ
V
OL
+ 0.5V
V
OH
– 0.5V
2.3V
2.3V
07430-011
Figure 5. Driver Enable/Disable Timing
OUTPUT LOW
OUTPUT HIGH
1.5V
1.5V
RO
RO
RE
0V
0.7V
CC
0.3V
CC
V
OL
V
OH
0.5V
CC
0.5V
CC
t
ZL
t
LZ
t
ZH
t
HZ
V
OL
+ 0.5V
V
OH
– 0.5V
07430-012
Figure 6. Receiver Enable/Disable Timing