DE Key Terms #3

DE

Logic Gate

An electronic circuit that performs a Boolean algebraic function.

Logic HIGH

The higher of two voltages in a digital system with two logic levels.

Logic LOW

The lower of two voltages in a digital system with two logic levels.

Medium Scale Integration (MSI)

An IC that contains circuitry equivalent to more than 11 and less than 100 gates.

NOT Gate

Also called an INVERTER gate. A logic gate that changes its input logic level to the opposite state.

OR Gate

The output of this circuit is HIGH (logic level 1) if any or all of its inputs are HIGH.

Plastic Leaded Chip Carrier (PLCC)

A square IC package with leads on all four sides designed for surface mounting on a circuit board.

Schottky TTL

TTL subfamily that uses the basic TTL standard circuit except that it uses a Schottky barrier code (SBD) connected between the base and the collector of each transistor for faster switching.

Sequential Logic

Digital circuitry in which the output state of the circuit depends not only on the states of the inputs, but also on the sequence in which they reached their present states.

Simulation

Testing design function by specifying a set of inputs and observing the resultant outputs.

Small Outline IC (SOIC)

An IC package similar to a DIP, but smaller, which is designed for automatic placement and soldering on the surface of a circuit board.

Small-Scale Integration (SSI)

An integrated circuit having 12 or fewer gates in one package.

Solder

Metallic alloy of tin and lead that is used to join two metal surfaces.

Solder Bridge

The unwanted formation of a conductive path of solder between conductors.

Soldering

Process of joining two metallic surfaces to make an electrical contact by melting solder (usually tin and lead) across them.