Path: utzoo!utgpu!watmath!att!cbnewsh!mrb1
From: mrb1@cbnewsh.ATT.COM (maurice.r.baker)
Newsgroups: sci.electronics
Subject: Re: Chip to select one of two inputs
Summary: Video Multiplexer from Maxim
Message-ID: <3071@cbnewsh.ATT.COM>
Date: 14 Aug 89 20:04:29 GMT
References: <1058@clyde.Concordia.CA>
Organization: AT&T Bell Laboratories
Lines: 34

In article <1058@clyde.Concordia.CA>, jean@maxwell.Concordia.CA ( JEAN GOULET ) writes:
> I am looking for a chip which satisfies the following:
> 
> -There are two inputs (composite video signals, actually).
> -There is one output (one of the above).
> -There is a TTL control line which selects one of the two inputs.
> 

Try contacting Maxim Integrated Products, Inc., 120 San Gabriel Drive,
Sunnyvale, California 94086.  They are at 408-737-7600.  The product
you may be interested in is the MAX453/454/455 series of video multiplexer/
amplifiers.  (The 453 has 2 input channels, 454 has 4 input channels, and
the 455 has 8 input channels)

They are TTL controllable, and will drive a 75 ohm coax cable.  These ICs
do require a split +/-5 VDC supply.

Maxim is pretty good about supplying parts in small sample quantities.  While
you are at it, make sure to get a copy of the 1988/89 Seminar Applications
Book and the 1989 Integrated Circuits Data Book.  Both very useful.

It seems to me that Intersil also makes a similar IC, but it may be harder
getting info., etc. on it what with all the turmoil in the GE/RCA/Intersil/
Harris melting pot.  A quick look at a recent Harris data book "Integrated
Circuits for Linear Applications" reveals a part called the CA3256 (listed
as "Product Preview") which would do the job quite nicely....it even has
LED Drivers to show which of the 4 input channels has been selected!  It was
originally developed as an RCA part.

Hope this helps!

M. Baker
AT&T-Bell Labs, Holmdel
hoqub!mrb