Day2 Logic Circuits
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Transcript of Day2 Logic Circuits
Logic Circuits
Logic CircuitsLogic Circuits
Turn to Real World from Logic
Real World: Real World: Electrical CharacteristicsElectrical Characteristics
LOGIC simulator
Scope
Think of Physics, other than LOGIC
TTL and CMOS IOTTL and CMOS IO
CMOS input only consumes leakage current
What is 1, 0 and High, LowWhat is 1, 0 and High, Low
Logic 1
Logic 0
output
Logic 1
Logic 0
inputNoiseMargin
VoltageVCC
Invalid
VOH
GND
VIH
VIL
5V VIH VIL VOH VOLTTL 2.0 0.8 2.4 0.4CMOS 3.5 1.5 4.4 0.33
3.3VCMOS 2.0 0.8 2.4 0.4
HIGH
LOWVOL
CMOS
=Vcc-0.1
=Gnd+0.1
Nosie MarginNosie Margin
Interface: Check Data SheetInterface: Check Data Sheet
Open Collector/Drain, Wire-OR, Open Collector/Drain, Wire-OR, LEVEL SHIFTERLEVEL SHIFTER
OPEN DRAIN
Tri-State, Hi Impedence, FloatingTri-State, Hi Impedence, FloatingCMOS
TTL
Propagation DelayPropagation Delay
TPLHtPHLrising time: trfalling time: tf
min, typ, max
Timing Hazard, GlitchTiming Hazard, Glitch
1
1
Fanout, LoadingFanout, Loading
Unit Loads = IOH/IIH = IOL/IIL = 400 μA/40 μA = 16 mA/1.6 mA = 10
TTLCMOS
Cap-load vs Freq
Schmitt Trigger InputSchmitt Trigger Input
Driving Strength and NosieDriving Strength and Nosie
Water PipeInductance
Logic CircuitsLogic Circuits
More On MAX II Device
MAX II, IO BankMAX II, IO Bank
MAX II, Power SupplyMAX II, Power Supply
MAX II, 3.3V LVTTL, LVCMOSMAX II, 3.3V LVTTL, LVCMOS
MAX II, 5.0V ComaptibilityMAX II, 5.0V Comaptibility
DIRECT DRIVE to 5VTTL3.3V ---> 2.4V
MAAX II, ACMAAX II, AC
MAX II IOEMAX II IOE
3.3V(400mv)2.5V(190mv)
25K~95KOhm
EPM1270T144C5ESEPM1270T144C5ES
SummarySummary
● TTL, CMOS basic characteristic● Voltage Level, Noise Margin● Logic: DC Level, propagation delay, fan-out● Open Collector/Drain, Wire-OR, Hi-Z● Schmitt Trigger Input● MAX II IO Bank, Power Supply● MAX II IOE, Interface● MAX II Data Sheet●