74HC04 Vs 74HCT14

patricklyw · 14th November 2003, 06:59 AM

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?

Netlist · 14th November 2003, 07:42 AM

Look here to find the differences.
http://www.semiconductors.philips.co...74HCT14DB.html
http://www.semiconductors.philips.com/pip/74HCT04D.html

/Hugo

patricklyw · 14th November 2003, 08:23 AM

Thanks. But I'm a dumb in electronic tech stuff.

Can anyone decode it for me? Thanks.

patricklyw · 15th November 2003, 12:47 AM

It should be 74HCU04 instead of 74HC04

MCLL · 15th November 2003, 05:47 AM

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

Netlist · 15th November 2003, 07:26 AM

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

Bassman59 · 15th November 2003, 09:53 PM

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."

patricklyw · 16th November 2003, 07:51 AM

Thanks guys. I guess I have to stick with the 74HCU04 then.

gregaudio · 16th November 2003, 05:56 PM

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

gregaudio · 16th November 2003, 06:59 PM

Buffering onto exit will be digital SPDIF, koaxal best 74HCU04.

Buffer ckock is best 74AC04.

14th November 2003, 06:59 AM	#1
patricklyw diyAudio Member Join Date: Nov 2003 Location: Hong Kong	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?

15th November 2003, 12:47 AM	#4
patricklyw diyAudio Member Join Date: Nov 2003 Location: Hong Kong	74HCU04 It should be 74HCU04 instead of 74HC04

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14th November 2003, 07:42 AM	#2
Netlist diyAudio Moderator Emeritus Join Date: Jan 2003	Look here to find the differences. http://www.semiconductors.philips.co...74HCT14DB.html http://www.semiconductors.philips.com/pip/74HCT04D.html /Hugo

14th November 2003, 08:23 AM	#3
patricklyw diyAudio Member Join Date: Nov 2003 Location: Hong Kong	Thanks. But I'm a dumb in electronic tech stuff. Can anyone decode it for me? Thanks.

15th November 2003, 07:26 AM	#6
Netlist diyAudio Moderator Emeritus Join Date: Jan 2003	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

16th November 2003, 07:51 AM	#8
patricklyw diyAudio Member Join Date: Nov 2003 Location: Hong Kong	Thanks guys. I guess I have to stick with the 74HCU04 then.

16th November 2003, 05:56 PM	#9
gregaudio diyAudio Member Join Date: Jun 2003 Location: Pu?awy	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

16th November 2003, 06:59 PM	#10
gregaudio diyAudio Member Join Date: Jun 2003 Location: Pu?awy	Buffering onto exit will be digital SPDIF, koaxal best 74HCU04. Buffer ckock is best 74AC04.