74HCT257DB datasheet(8/17 Pages) NXP

No. de pieza	74HCT257DB

Descripción Electrónicos	Quad 2-input multiplexer; 3-state

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74HC_HCT257_5

Product data sheet

Rev. 05 — 13 January 2010

8 of 17

NXP Semiconductors

74HC257; 74HCT257

Quad 2-input multiplexer; 3-state

[1]

tpd is the same as tPHL, tPLH.

[2]

ten is the same as tPZH, tPZL.

[3]

tdis is the same as tPHZ, tPLZ.

[4]

tt is the same as tTHL, tTLH.

[5]

CPD is used to determine the dynamic power dissipation (PD in μW).

PD = CPD × VCC2 × fi × N + ∑(CL × VCC2 × fo) where:

fi = input frequency in MHz;

fo = output frequency in MHz;

CL = output load capacitance in pF;

VCC = supply voltage in V;

N = number of inputs switching;

∑(C

L × VCC

2

× f

o) = sum of outputs.

tt

transition time

see Figure 6

[4]

VCC = 2.0 V

14

60

75

90

ns

VCC = 4.5 V

5

12

15

18

ns

VCC = 6.0 V

4

10

13

15

ns

CPD

power dissipation

capacitance

per multiplexer;

VI = GND to VCC

[5]

45

-

pF

74HCT257

tpd

propagation delay

nl0 to nY or nl1 to nY;

see Figure 6

[1]

VCC = 4.5 V

16

30

38

45

ns

VCC = 5.0 V; CL = 15 pF

13

-

ns

S to nY; see Figure 6

VCC = 4.5 V

20

35

44

53

ns

VCC = 5.0 V; CL = 15 pF

17

-

ns

ten

enable time

OE to nY; VCC = 4.5 V;

see Figure 7

[2]

15

30

38

45

ns

tdis

disable time

OE to nY; VCC = 4.5 V;

see Figure 7

[3]

16

30

38

45

ns

tt

transition time

VCC = 4.5 V; see Figure 6

[4]

5

12

15

18

ns

CPD

power dissipation

capacitance

per multiplexer;

VI = GND to VCC

[5]

45

-

pF

Table 7.

Dynamic characteristics …continued

Voltages are referenced to GND (ground = 0 V); For test circuit see Figure 8.

Symbol Parameter

Conditions

25

°C

−40 °C to

+85

°C

−40 °C to

+125

°C

Unit

Typ

Max

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