HP 54753A - Page 246

Transmission Line Theory Applied to Digital Systems
Signal Propagation Delay for Microstrip and Strip Lines with Distributed or Lumped Loads
11-18
Table 11-1
Maximum Open Line Length for MECL 10,100 (Gate Rise Time = 3.5 ns)
Z
o
(OHMS) FANOUT = 1
(2.9pF)
FANOUT = 2
(5.8pF)
FANOUT = 4
(11.6pF)
FANOUT = 8
(23.2pF)
l
MAX
(IN)
l
MAX
(IN)
l
MAX
(IN)
l
MAX
(IN)
MICROSTRIP
(Propagation Delay
0.148 ns/in.)
50 8.3 7.5 6.7 5.7
68 7.0 6.2 5.0 4.0
75 6.9 5.9 4.6 3.6
82 6.6 5.7 4.2 3.3
90 6.5 5.4 3.9 3.0
100 6.3 5.1 3.6 2.6
STRIPLINE
(Propagation Delay
0.188 ns/in.)
50 6.5 5.9 5.2 4.5
68 5.6 4.9 3.9 3.2
75 5.3 4.7 3.6 2.8
82 5.2 4.4 3.3 2.6
90 5.1 4.3 3.1 2.4
100 4.9 4.0 2.8 2.1
BACKPLANE
(Propagation Delay
0.140 ns/in.)
100 6.6 5.4 3.8 2.8
140 5.9 4.3 2.8 1.9
180 5.2 3.6 2.1 1.3