ADM1490E/ADM1491E
Data Sheet
Rev. D | Page 4 of 16
TIMING SPECIFICATIONS
TA = 40°C to +85°C.
Table 2.
Parameter
Symbol
Min
Typ
Max
Unit
Test Conditions/Comments
DRIVER
Maximum Data Rate
16
Mbps
Propagation Delay
tDPLH, tDPHL
11
17
ns
Driver Output Skew
tSKEW
0.5
2
ns
tSKEW = |tDPLH tDPHL|
Rise Time/Fall Time
tDR, tDF
8
15
ns
Enable Time
tZH, tZL
20
ns
Disable Time
tHZ, tLZ
20
ns
RECEIVER
Propagation Delay
tPLH, tPHL
12
20
ns
Skew |tPLH tPHL|
tSKEW
0.4
2
ns
Enable Time
tZH, tZL
13
ns
Disable Time
tHZ, tLZ
13
ns
Timing Diagrams
Switching Characteristics
Z
Y
VCC/2
tDPLH
tDPHL
1/2VO
VO
90% POINT
10% POINT
90% POINT
VDIFF = V(Y) – V(Z)
tDR
tDF
–VO
VDIFF
+VO
0V
VCC
07430-
009
Figure 3. Driver Propagation Delay Rise/Fall Timing
A – B
RO
0V
1.5V
VOH
OL
tPLH
tPHL
tSKEW = |tPLH – tPHL|
07430-
010
Figure 4. Receiver Propagation Delay Timing
DE
Y, Z
VCC
0V
VOL
VOH
0.5VCC
tZL
tLZ
tZH
tHZ
VOL + 0.5V
VOH – 0.5V
2.3V
07430-
0
1
Figure 5. Driver Enable/Disable Timing
OUTPUT LOW
OUTPUT HIGH
1.5V
RO
RE
0V
0.7VCC
0.3VCC
VOL
VOH
0.5VCC
0.5VCC
tZL
tLZ
tZH
tHZ
VOL + 0.5V
VOH – 0.5V
07430-
012
Figure 6. Receiver Enable/Disable Timing