Currently there are huge amounts of different digital IC chips available in the market starting from simplest logical elements and ending with processors and gate arrays (FPGA). Of course there also are lots of IC manufacturers offering IC’s. Many of them are specialized and wont be reviewed here. Lets limit ourself to smaller more general digital chips basically TTL 74series . This series is produced by many manufacturers like Texas Instruments (TI).
Common marking:

Manufacturer identifier indicates the manufacturer name;

Family – also indicates a temperature range:

• 74 - commercial (0…70°C), while CMOS chips has a range of (-40…+85°C);

• 54 – military where working temperature range is (-55…+125°C);

Series code – up to three symbols:

• none – standard TTL;

• LS – Low power Schottky;

• S – Schottky TTL;

• ALS – Advanced Schottky TTL;

• F – Tast TTL;

• HC- high speed CMOS;

• HCT – High speed CMOS with TTL inputs;

• AC – Advanced CMOS;

• ACT – Advanced CMOS with TTL inputs;

• BCT – BiCMOS technology;

• ABT- Advanced BiCMOS Technology;

• LVT – Low Voltage Technology with low voltage power source;

Identifier of special type – two symbols that can be excluded;

IC type – IC type describing its function;

Package type:

• N – plastic DIL (DIP);

• J- ceramic DIP;

• T- flat metal.

For instance SN74ALS373, SN74ACT7801, SN7400.

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This entry was posted on Monday, January 15th, 2007 at 7:20 pm and is filed under Electronics. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.