Re: 74HC4052 Alternative?
- From: "mkaras" <mkaras@xxxxxxxxxxxxxxxxxx>
- Date: 30 Nov 2006 21:50:03 -0800
jecottrell65@xxxxxxxxx wrote:
I'm switching the RX & TX lines from an MCU to two different serial
I/Os (XBee radio & regular old serial). I don't need the 1:4 capability
in the 74HC4052 and I'd like to get the lowest power option possible.
Does anyone have any suggestions or slick alternatives?
Thanks,
John
You have many choices available. The number of choices is greater if
you are switching the TxD and RxD lines at the logic level voltages
right at the microcontroller. If on the other hand the switching is
being done on the other side of an RS232 transceiver then your choice
of available switch parts becomes a lot more limited.
You could look at the MAX303 switching element. It offers two SPDT
configured switches that looks like it it would fit your application
directly. This part could be designed in to support the switching on
either side of the RS232 transceivers. See here:
http://www.maxim-ic.com/quick_view2.cfm/qv_pk/1060
Another choice you could consider is to toss the mux/switch idea all
together (and as long as both of your ports already require level
translators) you could look at a part similar to the ADM211 (there are
many others too) that has a tri-state enable pin. These essentially
allow you to tri-state bus multi-drop the microcontroller serial port
lines to multiple RS232 ports.
- mkaras
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