GA1086

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8

12

Ω

1.4 ns (max)

1.5 ns (typ)

1.5 ns (typ)

65

Ω

15 pF

65

Ω

15 pF

65

Ω

15 pF

12

Ω

65

Ω

CLK

GA1086

13

Ω

13

Ω

Q

FBIN

FBOUT

Figure 10. Split Unbalanced Termination

If rise times are critical and if overshoots and

undershoots can be tolerated, then unbalanced

termination may be used. Reflections due to

unbalanced termination can cause ringing at the load.

The transmission line lengths, therefore, must be long

enough to cause the ringing to occur only after the

waveform has completely switched to either the LOW

or the HIGH state, (the round trip). The propagation

time of the output signals should be greater than the

switching time for LOW to HIGH or HIGH to LOW.

37

Ω

65

Ω

30 pF

1.4 ns (max)

1.5 ns (typ)

65

Ω

37

Ω

CLK

GA1086

13

Ω

13

Ω

Q

FBIN

FBOUT

Figure 9. Unbalanced Termination

To double the number of loads (devices) driven by the

GA1086, split termination may be used. Examples of

three types of series termination and the resulting

waveforms, measured between 0.8 V and 2.0 V, are

shown in Figures 9 and 10 for one of the outputs.

Unused outputs must be terminated.