[sdiy] Re: 7400 / 4000 series ICs--compatible?

[Ken Stone]

And don't expect them to work at the other end - 18V either. At a fraction
over that, they physically explode! Well, last time I tried
(unintentionally) they did.

Ken

>Danger Will Robinson
>
>Some of the 4000 series will run at 3V, but not all. I would
>be very careful about choosing only those devices that DO
>work well. The biggest problem will be that they will have
>almost no drive capability at 3V and the gate capacitance
>isn't getting any smaller. I've seen some that flaked out
>long before 3V
>
>H^) harry
>
>Scott Gravenhorst wrote:
>
>> Phil Harbison <alvitar at comcast.net> wrote:
>> >
>> >I'm not familiar with that specific part, but the differences
>> >between 40xx, 74HCxx, and 74HCTxx parts are primarily related
>> >to supply voltage and input thresholds.
>> >
>> >40xx:    Vdd ranges from +5V to +15V
>>
>> I've seen data sheets that show min. Vdd at 3V.
>>
>> >74HCxx:  Vdd +5V, CMOS compatible input levels
>> >74HCTxx: Vdd +5V, TTL compatible input levels
>> >
>>
>> ---------------------------------------------------------
>> - Where merit is not rewarded, excellence fades.
>> - Hydrogen is pointless without solar.
>> - What good are laws that only lawyers understand?
>> - The media's credibility should always be questioned.
>> - The only good terrorist is a dead terrorist.
>> - Governments do nothing well, save collect taxes.
>>
>> -- Scott Gravenhorst | LegoManiac / Lego Trains / RIS 1.5
>> -- Linux Rex         | RedWebMail by RedStarWare
>> -- FatMan: home1.gte.net/res0658s/fatman/
>> -- NonFatMan: home1.gte.net/res0658s/electronics/
>> -- Autodidactic Master of Arcane and Hidden Knowledge.
>
>
_______________________________________________________________________
Ken Stone   sasami at hotkey.net.au or sasami at cgs.synth.net
Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>