There are currently huge amounts of different digital IC chips available in the market, starting from the 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 won’t be reviewed here. Let’s limit ourselves to smaller, more general digital chips, basically TTL 74series. This series is produced by many manufacturers like Texas Instruments (TI).
Manufacturer identifier indicates the manufacturer name;
Family – also indicates a temperature range:
- 74 – commercial (0…70°C), while CMOS chips have a range of (-40…+85°C);
- 54 – military where the 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 – Fast 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;
- N – plastic DIL (DIP);
- J – ceramic DIP;
- T– flat metal.
For instance SN74ALS373, SN74ACT7801, SN7400.