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TND306

更新时间: 2024-09-13 03:27:03
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安森美 - ONSEMI /
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High-Speed CMOS Product Designation Definitions

TND306 数据手册

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TND306  
High-Speed CMOS Product  
Designation Definitions  
Prepared by: Steve West  
ON Semiconductor  
http://onsemi.com  
TECHNICAL NOTE  
Designers can use HCT devices to perform logic level  
conversions only. In newer designs, the designer wants all  
the advantages of a true CMOS system and designs using  
only HC devices.  
HC vs. HCT  
ON Semiconductor’s High–Speed CMOS product family,  
intended to give the designer an alternative to LSTTL.  
HSCMOS, with the faster speed advantage over  
metal–gate CMOS (MC14000 series) and the lower power  
consumption advantage over LSTTL, is an optimum choice  
for midrange designs. With the availability of high–speed  
CMOS microprocessors and memories, the ability to design  
a 100% CMOS system is possible.  
HCT devices offer a short–term solution to the TTL/  
NMOS–to–CMOS interface problem. To achieve this  
interface capability, some CMOS advantages had to be  
compromised. These compromises include power  
consumption, operating voltage range, and noise immunity.  
In most cases HCT devices are drop–in replacements of  
TTL devices with significant advantages over the TTL  
devices. However, in some cases, an equivalent HCT  
device may not replace a TTL device without some form of  
circuit modification.  
“A” versus “Non–A”  
“A” Versus “Non–A” — ON Semiconductor has a  
device performance enhancement program for the  
High–Speed CMOS family. This is indicated by an “A” suffix  
on the device identification. Some of the characteristics of  
this “A” enhancement program are improved design, a  
better quality process, faster performing AC propagation  
delays and enhancements to various DC characteristics.  
The old “Non–A” process was a 5 micron process that  
was modified to run a 3.5 micron family. The new “A”  
process is a true 3 micron process and gives better process  
control, with improved performance and quality.  
Please see the specific device data sheet for “A”  
designation parameters.  
Semiconductor Components Industries, LLC, 2002  
1
Publication Order Number:  
January, 2002 – Rev. 0  
TND306/D  

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