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G4VWL > TECHNIK 02.03.01 02:17l 31 Lines 1033 Bytes #-9071 (0) @ WW
BID : 2814_G4VWL
Read: DK1ZZ GUEST OE7FMI
Subj: Re: BCD CLOCK CHIP INFO NEEDED/PINOUT
Path: DB0ZKA<DB0GPP<DB0LX<DB0RBS<DB0PSC<DB0ACH<PI8JOP<IK1ZNW<GB7CRV<GB7WLR<
GB7BOB<GB7OAR<GB7OAR
Sent: 010302/0032z @:GB7OAR.#16.GBR.EU $:2814_G4VWL Sally 3.1.066
Message from: G4VWL@GB7OAR.#16.GBR.EU
Quoting from a previous message...
>
> From: KC8IDG@N8SUV.#SEMI.MI.USA.NOAM
> To : TECH@WW
>
> BACK IN THE 70-80'S THEY MADE A CLOCK CHIP THAD PUT OUT EITHER DECIMAL OR
> BCD FOR A READOUT, I CAME ACROSS THE CHIPS BUT DO NOT KNOW WHICH ONE IT
> IS..
The AY-5-1224 by General Instruments was such a chip. It provided either
direct mutiplexed 7-segment LED drive or TTL-level BCD output.
The CT7002 by Cal-Tex provided only BCD outputs. The CT7001 being the more
usual multiplexed 7-segment output. The CT7003 was for fluorescent/gas-
discharge type displays but I don't know whether it was 7-seg or BCD output.
I can't imagine either still being available though but I have some more
info on them here if you think it would be useful.
Other clock chips from that era were MK50250N, MK50253N and MK50254N from
Mostek. The different numbers were for 50 or 60Hz and 12/24 hour display
options.
73 John.
Timed Friday 02 March 2001 00:25 gmt
BBS G4VWL@GB7OAR.#16.GBR.EU
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