I often use hct parts to interface 3.3v logic to 5v.

Harold

> Primary differences (very general):
>
> HC
> Operating Voltage: 2-6V
> Input trip points are CMOS levels(1/3 Vdd and 2/3 Vdd). This spec varies
> by brand and part.
>
> HCT
> Operating Voltage: 4.5 - 5.5V
> Input trip points are TTL Levels (0.8 Low and 2.4V highs) specs varies by
> brand.
>
>
> Sent on the Sprint=AE Now Network from my BlackBerry=AE
>
> -----Original Message-----
> From: William Couture <bcouture@gmail.com>
> Sender: piclist-bounces@mit.edu
> Date: Thu, 5 Sep 2013 10:34:09
> To: Microcontroller discussion list - Public.<piclist@mit.edu>
> Reply-To: "Microcontroller discussion list - Public." <piclist@mit.edu>
> Subject: [EE] 74xx part numbering
>
> Quick question:  in a 74??? part, what is the difference between a
> 74HC??? and a 74HCT???
>
> Thanks!
>
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