MM74HCT251 datasheet(3/4 Pages) NSC

Part #	MM74HCT251

Description	8-Channel TRI-STATE-R Multiplexer

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Manufacturer	NSC [National Semiconductor (TI)]

Direct Link	http://www.national.com

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AC Electrical Characteristics VCCe5V TAe25 C CLe15 pF tretfe6ns

Symbol

Parameter

Conditions

Typ

Guaranteed

Units

Limit

tPHL tPLH

Maximum Propagation Delay

26

35

ns

A BorCtoY

tPHL tPLH

Maximum Propagation

27

35

ns

Delay A B or C to W

tPHL tPLH

Maximum Propagation

22

31

ns

Delay Any D to Y

tPHL tPLH

Maximum Propagation

24

32

ns

Delay Any D to W

tPZH tPZL

Maximum Output Enable

RLe1kX

19

27

ns

Time W Output

CLe50 pF

tPZH tPZL

Maximum Output Enable

RLe1kX

19

26

ns

Time Y Output

CLe50 pF

tPHZ tPLZ

Maximum Output Disable Time

RLe1kX

26

40

ns

W Output

CLe5pF

tPHZ tPLZ

Maximum Output Disable Time

RLe1kX

27

40

ns

Y Output

CLe5pF

AC Electrical Characteristics VCC e 50V g10% CLe50 pF tretfe6 ns (unless otherwise specified)

TAe25 C

74HC

54HC

Symbol

Parameter

Conditions

TAeb40 Cto a85 CTAeb55 Cto a125 C Units

Typ

Guaranteed Limits

tPHL tPLH Maximum Propagation Delay

33

46

58

69

ns

A BorCtoY

tPHL tPLH Maximum Propagation

33

46

58

69

ns

Delay A B or C to W

tPHL tPLH Maximum Propagation

27

40

50

60

ns

Delay any D to Y

tPHL tPLH Maximum Propagation

27

40

50

60

ns

Delay any D to W

tPZH tPZL Maximum Output Enable Time RLe1kX

21

30

38

45

ns

W Output

tPZH tPZL Maximum Output Enable Time RLe1kX

21

30

38

45

ns

Y Output

tPHZ tPLZ Maximum Output Disable Time RLe1kX

22

40

50

60

ns

W Output

tPHZ tPLZ Maximum Output Disable Time RLe1kX

23

40

50

60

ns

Y Output

tTHL tTLH Maximum Output Rise

815

19

23

ns

and Fall Time

CPD

Power Dissipation

(per Package)

110

pF

Capacitance (Note 5)

CIN

Maximum Input

510

pF

Capacitance

Note 5

CPD determines the no load dynamic power consumption PDeCPD VCC2 faICC VCC and the no load dynamic current consumption ISeCPD VCC faICC

3

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