HP 54753A - Page 247

Transmission Line Theory Applied to Digital Systems
Signal Propagation Delay for Microstrip and Strip Lines with Distributed or Lumped
Loads
11-19
Table 11-2
Maximum Open Line Length for MECL 10,200, MECL 10H100, 10H210, 10H211 (Gate Rise Time = 2 ns)
Z
o
(OHMS) FANOUT = 1
(3.3pF)
FANOUT = 2
(6.6pF)
FANOUT = 4
(13.2pF)
FANOUT = 8
(26.4pF)
l
MAX
(IN)
l
MAX
(IN)
l
MAX
(IN)
l
MAX
(IN)
MICROSTRIP
(Propagation
Delay 0.148 ns/in.)
50 3.5 2.8 1.9 1.2
68 3.2 2.3 1.5 0.8
75 3.0 2.2 1.3 0.7
82 2.9 2.0 1.2 0.6
90 2.8 1.9 1.0 0.5
100 2.6 1.8 0.9 0.4
STRIPLINE
(Propagation
Delay 0.188 ns/in.)
50 2.8 2.2 1.5 1.0
68 2.5 1.9 1.2 0.6
75 2.4 1.7 1.1 0.6
82 2.3 1.6 0.9 0.5
90 2.2 1.5 0.8 0.4
100 2.0 1.4 0.7 0.3
BACKPLANE
(Propagation
Delay 0.140 ns/in.)
100 2.8 1.8 0.9 0.4
140 2.4 1.4 0.5 0.3
180 2.0 1.0 0.3 0.1