Chapter 8 Digital Electronics
DIP
A very common IC package with two parallel rows of pins intended to be inserted into a socket or through holes drilled in a printed circuit board
Transmission gate (bilateral switch)
CMOS circuit that acts like a single pole, single throw switch controlled by an input logic level
Noise immunity
Circuit's ability to tolerate noise voltages on its inputs
Latch-up
Condition of dangerously high current in a CMOS IC caused by high-voltage spikes or ringing at device input and output pins.
Power-supply decoupling
Connection of a small RF capacitor between ground and Vcc near each TTL integrated circuit on a circuit board.
CMOS (Complementary Metal-Oxide-Semiconductor)
IC technology that uses MOSFETs as the principal circuit element. This logic family belongs to the category of unipolar digital ICs
N-MOS (N Channel Metal-Oxide-Semiconductor)
IC technology that uses N-channel MOSFETs as the principal circuit element
P-MOS (P Channel Metal-Oxide-Semiconductor)
IC technology that uses P Channel MOSFETS as the principal circuit element
Floating inputs
Input signal that is left disconnected in a logic circuit
Interfacing
Joining of dissimilar devices in such a way that they are able to function in a compatible and coordinated manner; connection of the output of a system to the input of a different system with different electrical characteristics.
Fan-out
Maximum number of standard logic inputs that the output of a digital circuit can reliably drive
MOSFETs
Metal-oxide-semiconductor field-effect transistor
Noise margin
Quantitative measure of noise immunity
Totem pole
Term used to describe the way in which two bipolar transistors are arranged at the output of most TTL circuits
Electrostatic discharge (ESD)
The often detrimental act of the transfer of static electricity (i.e., an electrostatic charge) from one surface to another. This impulse of current can destroy electronic devices.
Current sinking
The output of a logic circuit sinks current from the input of the logic circuit that is driving
Current sourcing
The output of a logic circuit sources, or supplies, current to the input of the logic circuit that is driving.
Surface-mount technology (SMT)
a method of manufacturing circuit boards whereby ICs are soldered to conductive pads on the surface of the boards
Bus contention
a situation in which the outputs of two or more active devices are placed on the same bus line every time
Low voltage differential signaling (LVDS)
a technology for driving high speed data lines in a low voltage systems that uses two conductors and reverses the polarity to distinguish between high and low
buffer/driver
circuit designed to have a greater output current and/or voltage capability than an ordinary logic circuit
analog voltage comparator
circuit that compares two analog input voltages and produces an output that indicates which input is greater
Voltage-level translator
circuit that takes one set of input voltage levels and translates it to a different set of output levels
TTL
integrated circuit technology that uses the bipolar transistor as the principal circuit element
Current-sinking transistor (pull-down transistor)
name given to the output transistor of a TTL circuit. This transistor is turned on when the output logic level is low
Wired-AND
term used to describe the logic function created when an open collector outputs are tied together
Logic pulser
testing tool that generates a short duration pulse when actuated manually
Lead pitch
the distance between the centers of adjacent pins on an IC
Open-collector output
type of output structure of some TTL circuits in which you only have one transistor with a floating collector is used
Tristate
type of output structure that allows three types of output states, HIGH and LOW, and high impedance