From K1FK about the chips on the OMNI VI control board. He's dug deeper
than I have. Some parts the makers do show as obsolete, but I have
inquiries to TI and AD about the CODEC. Motorola PLL chips have often
tended to come and go as Motorola invented new versions.
73, Jerry, K0CQ
-------- Original Message --------
Subject: [TenTec] Why are so many dumping their OMNI VI Transceivers ????
Date: Thu, 10 Feb 2011 14:19:06 -0800 (PST)
From: David Bowker <david.bowker@yahoo.com>
To: geraldj@weather.net
Jerry,
All of the IC's on the VI/VI+ logic board are readily available in
single unit quantities from reliable sources and at reasonable cost as
of 21/01/2011. U4 and U9 require TT programming ... all the rest are
easily "owner replaceable" components ... if one has the technical
knowledge and ability to troubleshoot the board and identify the
defective component.
Several years ago I compiled a list of the ICs on the logic board and
their availability from various major component suppliers. After the
recent (early Jan/2011) thread on the list (and the 'notion' that some
components are obsolete) I updated the table - see attached. Feel free
to share with the list --- I'm not a subscriber.
73, Dave, K1FK
Fort Kent, ME
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His attachment unformatted.
> Sources for OMNI VI/VI+
> Logic Board Integrated Circuits
> Compiled by Dave Bowker, K1FK
> K1FK@arrl.net
> REF P/N FUNCTION MFR SUPPLIER
> U1 80C32 8 BIT uP Maxim, Phillips, Siemens Avnet, Newark, Arrow, Digi-Key
> U2 74HC573 Latch generic Mouser, Digi-Key, Newark, Arrow
> U3 74HC138 Decoder ditto Avnet, Newark, Mouser, Digi-Key
> U4 27C256 EPROM Amtel, STM Microelect. Mouser, Digi-Key, Newark,
must be programmed. Avnet, Future
Electronics
> U5 6264LL SRAM Cypress Semi. Alliance Memory Jameco
> U6 DS1285 Real time clock Maxim, Dallas Semi Q Components Portland, OR
Or replaced by DS12885 a current part GNJ
> U7 ADC0848 A-D Converter National Semi. Newark, Avnet, Arrow,
> Future Electronics
> U8 74HC573 Latch generic Mouser, Digi-Key,
> Newark,
> Arrow
> U9 27C64A EPROM Intel, STM Micro Newark, Avnet,
Must be programmed Future Electronics
> U10 ADSP 2105 DSP processor Analog Devices Newark, Avnet, Arrow
> U11 TLC32041 CODEC Texas Instruments Q Components Portland,
> OR
> U12 74HC74 D flip-flop generic Mouser, Digi-Key,
> Avnet,
> Newark
> U13 MC145170 PLL synthesizer Motorola Q Components Portland,
> OR
> U14 MAX232 RS232 transceiver Maxim Mouser, Digi-Key, Avnet
> U15 74HC00 Quad NAND generic Mouser, Digi-Key, Avnet,
> Newark
> U16 74HC00 Quad NAND generic Mouser, Digi-Key, Avnet,
> Newark
> U17 MC14077B Quad EX NOR generic Mouser, Avnet, Arrow
> U18 MC14077B Quad EX NOR generic Mouser, Avnet, Arrow
> U19 MC14093B Quad NAND generic Mouser, Newark, Avnet,
> Future Electronics
> U20 82C55A Peripheral interface Intersil Newark, Avnet, Arrow
> U21 74HC154 4-16 decode/demux generic Mouser, Newark, Digi-Key
> U22 ICL7660 High current driver Intersil Mouser, Newark, Avnet
> 1 Suppliers which have stock of correct package configuration and available
> in single unit quantities as of
> revision date of this table. This is NOT an all exclusive list of suppliers.
> 2 Commonly available component from various manufacturers. I called these
> generic GNJ
> 3 Requires TenTec firmware load.
> Revised 21/01/2011
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