Datasheet

SN65LVDS387, SN75LVDS387, SN65LVDS389
SN75LVDS389, SN65LVDS391, SN75LVDS391
HIGH-SPEED DIFFERENTIAL LINE DRIVERS
SLLS362D – SEPTEMBER 1999 – REVISED MAY 2001
11
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
APPLICATION INFORMATION
width
abs .
jitter
height
unit interval
Figure 15. Typical LVDS Eyepattern
A generally accepted range of jitter at the receiver inputs that allows data recovery is 5% to 20% of the unit
interval (data pulse width). Table 1 shows the signaling rate achieved on various cables and lengths at a 5%
eyepattern jitter with a typical LVDS driver.
Table 1. Signaling Rates for Various Cables for 5% Eyepattern Jitter
LENGTH
CABLE
†
LENGTH
(m)
A
(Mbps)
B
(Mbps)
C
(Mbps)
D
(Mbps)
E
(Mbps)
F
(Mbps)
1 240 200 240 270 180 230
5 205 210 230 250 215 230
10 180 150 195 200 145 180
†
Cable A: CAT 3, specified up to 16 MHz, no shield, outside conductor diameter (∅) 0.52 mm
Cable B: CAT 5, specified up to 100 MHz, no shield, ∅ 0.52 mm
Cable C: CAT 5, specified up to 100 MHz, taped over all shield, ∅ 0.52 mm
Cable D: CAT 5 (exceeding CAT 5), specified up to 300 MHz, braided over all shield plus taped individual shield for any
pair, ∅ 0.64 mm (AWG22)
Cable E: CAT 5 (exceeding CAT 5), specified up to 350 MHz, ∅ 0.64 mm (AWG22), no shield
Cable F: CAT 5 (exceeding CAT 5), specified up to 350 MHz, “self-shielded”, ∅ 0.64 mm (AWG22)
During synchronous parallel transfers, skew between the data and clock lines will also reduce the timing margin.
This must be accounted for in the system timing budget. Fortunately, the low output skew of this LVDS driver
will generally be a small portion of this budget.
other LVDS products
For other products and applications notes in the LVDS and LVDM product families visit our Web site at
http://www.ti.com/sc/datatran.