74AHCT240D datasheet(7/16 Pages) NXP

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74AHC_AHCT240

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Product data sheet

Rev. 2 — 26 November 2010

7 of 16

NXP Semiconductors

74AHC240; 74AHCT240

Octal buffer/line driver; inverting; 3-state

[1]

Typical values are measured at nominal supply voltage (VCC = 3.3 V and VCC = 5.0 V).

[2]

tpd is the same as tPLH and tPHL; ten is the same as tPZH and tPZL; tdis is the same as tPLZ and tPHZ.

[3]

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

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

 f

o) = sum of outputs.

11. Waveforms

74AHCT240

tpd

propagation delay

nAn to nYn; see Figure 5

[2]

VCC = 4.5 V to 5.5 V; CL = 15 pF

3.0

5.8

1.0

6.8

8.5

VCC = 4.5 V to 5.5 V; CL = 50 pF

4.4

8.4

1.0

9.5

11.9

ten

enable time

nOE to nYn; see Figure 6

[2]

VCC = 4.5 V to 5.5 V; CL = 15 pF

3.4

7.5

1.0

9.0

14.4

VCC = 4.5 V to 5.5 V; CL = 50 pF

4.5

9.5

1.0

11.5

14.4

tdis

disable time

nOE to nYn; see Figure 6

[2]

VCC = 4.5 V to 5.5 V; CL = 15 pF

3.9

6.1

1.0

6.7

8.3

VCC = 4.5 V to 5.5 V; CL = 50 pF

6.2

8.7

1.0

9.2

11.5

CPD

power dissipation

capacitance

VI = GND to VCC; CL =50pF;

fi =1MHz

[3]

-9

Table 7.

Dynamic characteristics …continued

Voltages are referenced to GND (ground = 0 V); for test circuit see Figure 7.

Symbol Parameter

Conditions

C

40 C to +125 C

Unit

Min

Typ[1]

Max

Min

Max

(85

C)

Max

(125

C)

Measurement points are given in Table 8.

VOL and VOH are typical voltage output drop that occur with the output load.

Fig 5.

Propagation delay input (nAn) to output (nYn)

mgu781

nAn input

nYn output

tPHL

tPLH

GND

VOH

VOL

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