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basics | Trying to identify a chip...
There are 6 messages in this thread.
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Trying to identify a chip... - Dave - 2009-11-17 10:15:00
Suspect it is a MC145155-2 in the 18-pin DIP package. Datasheet for this chip shows pin 5 as VDD, and I am wondering, isn't VDD usually the same as GND? (Don't see any pins labled as GND, although there is VSS ,which I am thinking is +5 volts). And the chip mentioned above is a PLL, btw. Any help is appreciated... Thanks, Dave
Re: Trying to identify a chip... - baron - 2009-11-17 10:28:00
Dave Inscribed thus: > Suspect it is a MC145155-2 in the 18-pin DIP package. Datasheet for > this chip shows pin 5 as VDD, and I am wondering, isn't VDD usually > the same as > GND? (Don't see any pins labled as GND, although there is VSS ,which > I am > thinking is +5 volts). And the chip mentioned above is a PLL, btw. > Any help is appreciated... > > Thanks, > > Dave <http://encyclobeamia.solarbotics.net/articles/vxx.html>; -- Best Regards: Baron.
Re: Trying to identify a chip... - Dave - 2009-11-17 10:37:00
"baron" <b...@linuxmaniac.nospam.net> wrote in message news:hduff2$e4s$1...@news.eternal-september.org... > Dave Inscribed thus: > >> Suspect it is a MC145155-2 in the 18-pin DIP package. Datasheet for >> this chip shows pin 5 as VDD, and I am wondering, isn't VDD usually >> the same as >> GND? (Don't see any pins labled as GND, although there is VSS ,which >> I am >> thinking is +5 volts). And the chip mentioned above is a PLL, btw. >> Any help is appreciated... >> >> Thanks, >> >> Dave > > <http://encyclobeamia.solarbotics.net/articles/vxx.html>; > > -- > Best Regards: > Baron. Why *thank you* Baron. Much appreciated... Dave
Re: Trying to identify a chip... - Bob Eld - 2009-11-17 10:41:00
"Dave" <d...@hotmail.com> wrote in message news:S...@posted.internetamerica... > Suspect it is a MC145155-2 in the 18-pin DIP package. Datasheet for this > chip shows pin 5 as VDD, and I am wondering, isn't VDD usually the same as > GND? (Don't see any pins labled as GND, although there is VSS ,which I am > thinking is +5 volts). And the chip mentioned above is a PLL, btw. Any > help is appreciated... > > Thanks, > > Dave I believe you have it backwards, Vdd is + Voltage and Vss is GND. According to the data sheet, Vdd can be between +3Volts and +9Volts.
Re: Trying to identify a chip... - Dave - 2009-11-17 10:56:00
"Bob Eld" <n...@yahoo.com> wrote in message news:hdug68$moj$1...@news.eternal-september.org... > > "Dave" <d...@hotmail.com> wrote in message > news:S...@posted.internetamerica... >> Suspect it is a MC145155-2 in the 18-pin DIP package. Datasheet for this >> chip shows pin 5 as VDD, and I am wondering, isn't VDD usually the same >> as >> GND? (Don't see any pins labled as GND, although there is VSS ,which I >> am >> thinking is +5 volts). And the chip mentioned above is a PLL, btw. Any >> help is appreciated... >> >> Thanks, >> >> Dave > > I believe you have it backwards, Vdd is + Voltage and Vss is GND. > According > to the data sheet, Vdd can be between +3Volts and +9Volts. > > Yes, I see that now. Had it exactly backwards. <shaking head> Thanks.
Re: Trying to identify a chip... - baron - 2009-11-17 11:07:00
Dave Inscribed thus: > > "baron" <b...@linuxmaniac.nospam.net> wrote in message > news:hduff2$e4s$1...@news.eternal-september.org... >> Dave Inscribed thus: >> >>> Suspect it is a MC145155-2 in the 18-pin DIP package. Datasheet for >>> this chip shows pin 5 as VDD, and I am wondering, isn't VDD usually >>> the same as >>> GND? (Don't see any pins labled as GND, although there is VSS >>> ,which I am >>> thinking is +5 volts). And the chip mentioned above is a PLL, btw. >>> Any help is appreciated... >>> >>> Thanks, >>> >>> Dave >> >> <http://encyclobeamia.solarbotics.net/articles/vxx.html>; >> >> -- >> Best Regards: >> Baron. > > Why *thank you* Baron. Much appreciated... > > Dave You're welcome. -- Best Regards: Baron.