74AHC244BQ datasheet(8/16 Pages) NXP

部件名	74AHC244BQ

功能描述	Octal buffer/line driver; 3-state

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制造商	NXP [NXP Semiconductors]

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8 / 16 page

74AHC_AHCT244_5

Product data sheet

Rev. 05 — 20 December 2007

8 of 16

NXP Semiconductors

74AHC244; 74AHCT244

Octal buffer/line driver; 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 tPZL and tPZH.

tdis is the same as tPLZ and tPHZ.

[3]

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

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

fi = input frequency in MHz;

fo = output frequency in MHz;

CL = output load capacitance in pF;

VCC = supply voltage in Volts.

11. Waveforms

For type 74AHCT244

tpd

propagation

delay

nAn to nYn; see Figure 6

[2]

VCC = 4.5 V to 5.5 V

CL = 15 pF

-

3.5

7.4

1.0

8.5

1.0

9.5

ns

CL = 50 pF

-

5.0

8.4

1.0

9.5

1.0

10.5

ns

ten

enable time

nOE to nYn; see Figure 7

VCC = 4.5 V to 5.5 V

CL = 15 pF

-

3.5

10.4

1.0

12.0

1.0

13.0

ns

CL = 50 pF

-

5.5

11.4

1.0

13.0

1.0

14.5

ns

tdis

disable time

nOE to nYn; see Figure 7

[2]

VCC = 4.5 V to 5.5 V

CL = 15 pF

-

5.0

9.4

1.0

10.0

1.0

12.0

ns

CL = 50 pF

-

7.0

11.4

1.0

13.0

1.0

14.5

ns

CPD

power

dissipation

capacitance

per buffer;

CL =50pF;f=1 MHz;

VI = GND to VCC

[3]

-12

-

pF

Table 7.

Dynamic characteristics …continued

GND = 0 V. For test circuit see Figure 8.

Symbol Parameter

Conditions

25

°C

−40 °C to +85 °C −40 °C to +125 °C Unit

Min

Typ[1] Max

Min

Max

Min

Max

Measurement points are given in Table 8.

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

Fig 6.

Propagation delay input (nAn) to output (nYn)

mna171

nAn input

nYn output

tPLH

tPHL

GND

VI

VM

VOH

VOL

类似零件编号 - 74AHC244BQ

制造商	部件名	数据表	功能描述
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