What is a TTL chip?

What is a TTL chip?

Transistor–transistor logic (TTL) is a logic family built from bipolar junction transistors. Some TTL chips are now also made in surface-mount technology packages. TTL became the foundation of computers and other digital electronics.

Why 74LS devices are better than 74 devices?

The 74S family, using Schottky circuitry, uses more power than the 74, but is faster. The 74LS family of ICs is a lower-power version of the 74S family, with slightly higher speed but lower power dissipation than the original 74 family; it became the most popular variant once it was widely available.

What is the difference between 74LS and 74HC?

difference between 74ls 74hc The 74LS is Transistor to Transistor logic. Uses Shottky transistors to reduce the stored charge and get higher switching speeds then with conventional bipolar transistors. The 74HC uses MOSFET technology. Therefore can operate with wider variety of voltages.

What is temperature range of 74 series of TTL families?

74 − Commercial grade, IC plastic package with temperature range of 0°C to +70°C although some sub families have an extended range of − 40°C to +125°C.

What does TTL output mean?

Transistor-Transistor Logic
A majority of systems we use rely on either 3.3V or 5 V TTL Levels. TTL is an acronym for Transistor-Transistor Logic. It relies on circuits built from bipolar transistors to achieve switching and maintain logic states. Basically, this means that output voltage of the device driving HIGH will always be at least 2.7 V.

Is 74LS a CMOS?

The 74LS (Low-power Schottky) family (like the original) uses TTL (Transistor-Transistor Logic) circuitry which is fast but requires more power than later families. The 74HC family has High-speed CMOS circuitry, combining the speed of TTL with the very low power consumption of the 4000 series.

Is 74HC compatible with 74LS?

The 74HC family has High-speed CMOS circuitry, combining the speed of TTL with the very low power consumption of the 4000 series. The 74HCT family is a special version of 74HC with 74LS TTL-compatible inputs so 74HCT can be safely mixed with 74LS in the same system.

What is the difference between 74 series and 54 series?

The 74 identifies the IC as a commercial-grade member of the family. The 54 identifies the IC as a high-quality military-grade member of the family. These devices are encapsulated in exotic packages, can use supplies within the limit +4.5 V to +5.5 V, and can operate over the temperature range -55° C to +125° C.

Which logic family has lowest power consumption?

The logic family with the lowest power dissipation is

• TTL.
• DTL.
• CMOS.
• ECL.