DE Ch 9

Latches and flip-flops are used as integral parts of more complex devices.

T

Pushbutton or toggle switches are sometimes used to generate pulses for digital circuit inputs

T

A device enabled by an edge is edge triggered or edge sensitive

T

Sequential circuits are circuits whose outputs are functions only of their present inputs

F

In a NAND latch, the gates have active-High inputs and active LOW outputs

F

Elapsed time from the 50% point of the leading edge of a pulse to the 50% point of the trailing edge is

pulse width

The output of a ____ is a function both of the present input conditions and the previous conditions of the inputs and/or outputs

sequential circuit

A latch input that makes the latch store a logic 0 describes

Reset 1

The difference between a latch and a flip-flop is

the condition under which the stored bit is allowed to change

______ can be a serious problem, particularly when a switch is used as an input to a digital circuit that responds to individual pulses

Contact bounce

A latch whose output follows its data inputs when its ENABLE input is active is a

transparent latch

_______ is an enabling input to a sequential circuit that is sensitive to the positive or negative going edge of a waveform

Clock

_________ is the momentary variation of voltage from one logic level to the opposite level and back again

Pulse

________is the part of a signal where the logic level is in transition from a LOW to a HIGH

Rising edge

A circuit in an edge triggered flip flop that converts the active edge of a CLOCK input into an active-level pulse at the internal latch's SET and RESET inputs is an

edge detector

A gated latch with a clock input is called a

Flip Flop

The ____ has two inputs SET and RESET

SR Latch

A ________ operates only when it is held down; when released, a spring returns the switch to its rest position

momentary-contact switch

When a switch is operated and contact is made__________, the contact - because it is mechanical- will bounce a few times before settling into the new position

on a new terminal

The CLOCK input enables a circuit only while in transition, so it can be referred to as:

dynamic