CD74HCT221M datasheet(8/23 Pages) TI1

Part #	CD74HCT221M

Description	High-Speed CMOS Logic

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Manufacturer	TI1 [Texas Instruments]

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8

Test Circuits and Waveforms

NOTE: Outputs should be switching from 10% VCC to 90% VCC in

accordance with device truth table. For fMAX, input duty cycle = 50%.

FIGURE 1. HC CLOCK PULSE RISE AND FALL TIMES AND

PULSE WIDTH

NOTE: Outputs should be switching from 10% VCC to 90% VCC in

accordance with device truth table. For fMAX, input duty cycle = 50%.

FIGURE 2. HCT CLOCK PULSE RISE AND FALL TIMES AND

PULSE WIDTH

FIGURE 3. HC TRANSITION TIMES AND PROPAGATION

DELAY TIMES, COMBINATION LOGIC

FIGURE 4. HCT TRANSITION TIMES AND PROPAGATION

DELAY TIMES, COMBINATION LOGIC

CLOCK

90%

50%

10%

GND

VCC

trCL

tfCL

50%

tWL

tWH

10%

tWL + tWH =

fCL

I

CLOCK

2.7V

1.3V

0.3V

GND

3V

trCL = 6ns

tfCL = 6ns

1.3V

tWL

tWH

0.3V

tWL + tWH =

fCL

I

tPHL

tPLH

tTHL

tTLH

90%

50%

10%

50%

10%

INVERTING

OUTPUT

INPUT

GND

VCC

tr = 6ns

tf = 6ns

90%

tPHL

tPLH

tTHL

tTLH

2.7V

1.3V

0.3V

1.3V

10%

INVERTING

OUTPUT

INPUT

GND

3V

tr = 6ns

tf = 6ns

90%

CD54HC221, CD74HC221, CD74HCT221

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