Datasheet

www.ti.com
t
c
Previous Cycle Current Cycle
t
0
min
t
1
min
RA
RB
t
0
max
t
1
max
t
2
min
t
2
max
t
3
min
t
3
max
t
4
min
t
4
max
t
5
min
t
5
max
t
6
min
t
6
max
RCLK
min max
t
SK
t
SK
min max min max
t
n
t
STPOS
t
n+1
1.4 V
1 V
RA+ or RB+
RA− or RB−
C
Ideal Strobe Position
SN75LVDT1422
SLLS653 – JUNE 2005
PARAMETER MEASUREMENT INFORMATION (continued)
Figure 17. Receiver LVDS Input Strobe Position
(1) C – Setup and hold time (internal data sampling window) defined by t
STPOS
(receiver input strobe position) min and
max
(2) t
n
– Transmitter output pulse position (min and max)
(3) t
SK
= Cable skew (type, length) + source clock jitter (cycle to cycle)
(5)
+ ISI (inter-symbol interference)
(6)
(4) Cable skew – typically 10 ps to 40 ps per foot, media dependent
(5) Cycle-to-cycle jitter is less than 150 ps at 85 MHz
(6) ISI is dependent on interconnect length; may be zero
Figure 18. Receiver LVDS Input Skew Margin
15