GA1086MC500 Просмотр технического описания (PDF) - TriQuint Semiconductor

Номер в каталоге

Компоненты Описание

производитель

GA1086MC500

11-Output Clock Buffer

TriQuint Semiconductor 

GA1086

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.

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.

Figure 9. Unbalanced Termination

65 Ω

37 Ω

FBIN

13 Ω

FBOUT

13 Ω

Q

CLK

GA1086

37 Ω

Qt0

Qt0

65 Ω

Qt1

Qt1

30 pF

1.4 ns (max)

1.5 ns (typ)

Figure 10. Split Unbalanced Termination

65 Ω

FBIN

13 Ω

FBOUT

65 Ω

12 Ω

13 Ω

Q

CLK

GA1086

12 Ω

Qt0

15 pF

65 Ω

65 Ω

Qt0

Qt1

15 pF

Qt1

Qt2

15 pF

Qt2

1.4 ns (max)

1.5 ns (typ)

1.5 ns (typ)

Note: Rise time at Qt1 is measured between 0.8 V and 2.0 V.

8

For additional information and latest specifications, see our website: www.triquint.com

Share Link: