HEF4078BD datasheet(3/3 Pages) PHILIPS

Part #	HEF4078BD

Description	8-input NOR gate

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Manufacturer	PHILIPS [NXP Semiconductors]

Direct Link	http://www.nxp.com

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3 / 3 page

January 1995

3

Philips Semiconductors

Product speciﬁcation

8-input NOR gate

HEF4078B

gates

AC CHARACTERISTICS

VSS =0V; Tamb =25 °C; CL = 50 pF; input transition times ≤ 20 ns

VDD

V

SYMBOL

TYP.

MAX.

TYPICAL EXTRAPOLATION

FORMULA

Propagation delays

In → On

5

80

160

ns

53 ns

+ (0,55 ns/pF) CL

HIGH to LOW

10

tPHL

35

70

ns

24 ns

+ (0,23 ns/pF) CL

15

25

50

ns

17 ns

+ (0,16 ns/pF) CL

5

80

160

ns

53 ns

+ (0,55 ns/pF) CL

LOW to HIGH

10

tPLH

35

70

ns

24 ns

+ (0,23 ns/pF) CL

15

25

50

ns

17 ns

+ (0,16 ns/pF) CL

Output transition

times

5

60

120

ns

10 ns

+ (1,0 ns/pF) C

L

HIGH to LOW

10

tTHL

30

60

ns

9 ns

+ (0,42 ns/pF) CL

15

20

40

ns

6 ns

+ (0,28 ns/pF) CL

5

60

120

ns

10 ns

+ (1,0 ns/pF) CL

LOW to HIGH

10

tTLH

30

60

ns

9 ns

+ (0,42 ns/pF) CL

15

20

40

ns

6 ns

+ (0,28 ns/pF) CL

VDD

V

TYPICAL FORMULA FOR P (

µW)

Dynamic power

5

750 fi +∑ (foCL) × VDD 2

where

dissipation per

10

2800 fi +∑ (foCL) × VDD 2

fi = input freq. (MHz)

package (P)

15

7500 fi +∑ (foCL) × VDD 2

fo = output freq. (MHz)

CL = load capacitance (pF)

∑ (f

oCL) = sum of outputs

VDD = supply voltage (V)

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