74HC04 Vs 74HCT14 - diyAudio
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Old 14th November 2003, 06:59 AM   #1
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Default 74HC04 Vs 74HCT14

I have tried to replace 74HC04 with 74HCT14 in my X-DAC. But my X-DAC could not recognise signal from CDT.

Is 74HC04 compatible with 74HCT14 chip? Any way to modify?
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Old 14th November 2003, 07:42 AM   #2
Netlist is offline Netlist  Belgium
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Look here to find the differences.
http://www.semiconductors.philips.co...74HCT14DB.html
http://www.semiconductors.philips.com/pip/74HCT04D.html

/Hugo
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Old 14th November 2003, 08:23 AM   #3
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Thanks. But I'm a dumb in electronic tech stuff.

Can anyone decode it for me? Thanks.
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Old 15th November 2003, 12:47 AM   #4
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Default 74HCU04

It should be 74HCU04 instead of 74HC04
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Old 15th November 2003, 05:47 AM   #5
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Default Re: 74HCU04

Quote:
Originally posted by patricklyw
It should be 74HCU04 instead of 74HC04

74HC04 (Chinese Character Website)

http://www.diyzone.net/sections.php?...page&artid=172


74HCU04 (Chinese Character Website)

http://eddie.dyec.com.tw/diy-demo/au...d-4550/p10.htm
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Old 15th November 2003, 07:26 AM   #6
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Hi Patrick
http://www.semiconductors.philips.com/pip/74HCU04.html
I'm not into digital, but it might be something with that TTL vs. CMOS thing. Supply voltage?

/Hugo
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Old 15th November 2003, 09:53 PM   #7
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Default Re: 74HCU04

Quote:
Originally posted by patricklyw
It should be 74HCU04 instead of 74HC04
The HCU04 part is unbuffered -- it's essentially a pair of MOSFETs. It's an inverter, but it's more like a unity-gain analog inverter -- if the inputs are not square waves, the outputs won't be square waves.

It's commonly used with a crystal in oscillator circuits.

The 74HC14, on the other hand, is a Schmitt trigger inverter. This device WILL square up unsquare inputs.

In other words, these devices are both inverters, but you cannot substitute one for the other in applications designed to use each chip's "feature."
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Old 16th November 2003, 07:51 AM   #8
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Thanks guys. I guess I have to stick with the 74HCU04 then.
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Old 16th November 2003, 05:56 PM   #9
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Compatible 74HC04 is 74AC04

74HC04 delay 8ns state logical V IL- 30% Vcc , V IH - 70% Vcc, Vcc +2.- 6V

74AC04 delay 4ns state logikal V IL- 30% Vcc , V IH - 70% Vcc, Vcc +2 - 6V

74HCT14 compatible 74ACT14

74HCT14 delay 9ns VIL-0,8V, V IH-2V, Vcc 4,5- 5,5V.

74ACT14 delay 6ns VIL-0,8V, VIH -2V, Vcc 4,5 -5,5V.

Arrangements are compatible.
Logical the same levels.

I exchanged juz this arrangement.
Effect is superb.

I greet
Greg


gregaudio.republika.pl
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Old 16th November 2003, 06:59 PM   #10
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Buffering onto exit will be digital SPDIF, koaxal best 74HCU04.

Buffer ckock is best 74AC04.
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