CD74AC20 datasheet(4/5 Pages) TI

Part #	CD74AC20

Description	Dual 4-Input NAND Gate

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Manufacturer	TI [Texas Instruments]

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Switching Speciﬁcations Input tr, tf = 3ns, CL = 50pF (Worst Case)

PARAMETER

SYMBOL

VCC (V)

-40oC TO 85oC

-55oC TO 125oC

UNITS

MIN

TYP

MAX

MIN

TYP

MAX

AC TYPES

Propagation Delay, Input to

Output

tPLH, tPHL

1.5

-

139

-

153

ns

3.3

(Note 9)

4.4

-

15.5

4.3

-

17.1

ns

5

(Note 10)

3.1

-

11.1

3.1

-

12.2

ns

Input Capacitance

CI

-

-10-

-10

pF

Power Dissipation Capacitance

CPD

(Note 11)

-

48

-

48

-

pF

ACT TYPES

Propagation Delay, Input to

Output

tPHL

tPLH

5

(Note 10)

3.5

-

12.3

3.4

-

13.5

ns

Input Capacitance

CI

-

-10-

-10

pF

Power Dissipation Capacitance

CPD

(Note 11)

-

48

-

48

-

pF

NOTES:

8. Limits tested at 100%.

9. 3.3V Min at 3.6V, Max at 3V.

10. 5V Min at 5.5V, Max at 4.5V.

11. CPD is used to determine the dynamic power consumption per gate.

AC: PD = VCC

2 f

i (CPD + CL)

ACT: PD = VCC

2 f

i (CPD + CL) + VCC ∆ICC where fi = input frequency, CL = output load capacitance, VCC = supply voltage.

DUT

OUTPUT

RL (NOTE)

OUTPUT

LOAD

500

Ω

CL

50pF

NOTE: For AC Series Only: When VCC = 1.5V, RL = 1kΩ.

FIGURE 1. PROPAGATION DELAY TIMES

AC

ACT

Input Level

VCC

3V

Input Switching Voltage, VS

0.5 VCC

1.5V

Output Switching Voltage, VS

0.5 VCC

FIGURE 2.

GND

INPUT

LEVEL

tr = 3ns

tf = 3ns

VI

VO

90%

VS

10%

GND

VS

tPHL

tPLH

CD74AC20, CD54/74ACT20

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