ATT 8 Test Latest Update Exam Revision

ATT 8 Test Latest Update

This study guide provides a structured breakdown of digital circuits, focusing
on logic gates, flip-flops, timers, registers, and memory, crucial for the ATT 8
exam.

I. Digital Circuit Fundamentals

 Sequential Circuits:

o Utilize feedback lines.

 Word:

o A complete unit of digital data.

 Flip-Flops:

o Store data via output-to-input feedback.

o Level triggering: Relies on low pulse width.

 Registers:

o Function to store and transfer data.

 Logic Probe:

o Indicates a high signal with a red LED.

 Integrated Circuits (ICs):

o Enabled by semiconductor invention.

o Features: Pins, part number, pin indicator.

 IC Families:

o CMOS: Lowest power rating/requirements, 0V-15V I/O.

o ECL: Fastest switching speed.

o TTL: lower power then ECL.

 Digital Signals:

o Presence: 5V/high/true/on.

o Absence: 0V/low/false/off.

 Voltage Levels:

, o Low: 0-0.8V.

o High: 2V or more.

o Float: 0.8-2v.

 IC Classification (Gate Count):

o SSI: <12 gates.

o MSI: 12-99 gates.

o LSI: 100-9,999 gates.

o VLSI: 10,000-99,999 gates.

o ULSI: 100,000+ gates.

 Buffer Functions:

o Protection, driver, switching.

 ESD Sensitivity:

o Low operating current and voltage levels.

II. Logic Gates and Functions

 Decimal Encoder:

o Decimal to binary conversion.

 Binary Decoder:

o Binary to alphanumeric conversion.

 AND Gate:

o High output: All inputs high.

 NAND Gate:

o Low output: All inputs high.

 NOR Gate:

o High output: All inputs low.

o Low output: Any input high.

 XOR Gate:

o High output: Odd number of high inputs.