LMH6574 Datasheet, PDF (15/27 Pages) National Semiconductor (TI) – 4:1 High Speed Video Multiplexer

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LMH6574
SNCS103D – NOVEMBER 2004 – REVISED DECEMBER 2014
Typical Application (continued)
7.2.4 Multiplexer Expansion
It is possible to use multiple LMH6574 devices to expand the number of inputs that can be selected for output.
Figure 29 shows an 8:1 MUX using two LMH6574 devices.
Figure 29. 8:1 MUX Using Two LMH6574 Devices
In such an application, the output settling may be longer than the LMH6574 switching specifications (~20ns),
while switching between two separate LMH6574 devices. The switching time limiting factor occurs when one
LMH6574 is turned off and another one is turned on, using the SD (shutdown) pin. The output settling time
consists of the time needed for the first LMH6574 to enter high impedance state plus the time required for the
second LMH6574 output to dissipate the left-over output charge of the first device (limited by the output current
capability of the second device) and the time needed to settle to the final voltage value.
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