74AHCT245BQ datasheet(7/16 Pages) NXP

部品番号	74AHCT245BQ

部品情報	Octal bus transceiver 3-state

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7 / 16 page

74AHC_AHCT245_3

Product data sheet

Rev. 03 — 25 September 2007

7 of 16

NXP Semiconductors

74AHC245; 74AHCT245

Octal bus transceiver; 3-state

10. Dynamic characteristics

Table 7.

Dynamic characteristics

GND = 0 V. For test circuit see Figure 7.

Symbol Parameter

Conditions

25

°C

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

Min

Typ[1] Max

Min

Max

Min

Max

For type 74AHC245

tpd

propagation

delay

nAn to nYn; see Figure 5

[2]

VCC = 3.0 V to 3.6 V

CL = 15 pF

-

5.0

8.4

1.0

10.0

1.0

10.5

ns

CL = 50 pF

-

6.5

11.9

1.0

13.5

1.0

15.0

ns

VCC = 4.5 V to 5.5 V

CL = 15 pF

-

3.5

5.5

1.0

6.5

1.0

7.0

ns

CL = 50 pF

5.0

7.5

1.0

8.5

1.0

9.5

ns

ten

enable time

nOE to nYn; see Figure 6

[2]

VCC = 3.0 V to 3.6 V

CL = 15 pF

-

6.5

13.2

1.0

15.5

1.0

16.5

ns

CL = 50 pF

-

9.0

16.7

1.0

19.0

1.0

21.0

ns

VCC = 4.5 V to 5.5 V

CL = 15 pF

-

4.0

8.5

1.0

10.0

1.0

11.0

ns

CL = 50 pF

-

5.0

10.6

1.0

12.0

1.0

13.5

ns

tdis

disable time

nOE to nYn; see Figure 6

[2]

VCC = 3.0 V to 3.6 V

CL = 15 pF

-

7.5

12.5

1.0

15.5

1.0

16.0

ns

CL = 50 pF

-

10.0

15.8

1.0

18.0

1.0

20.0

ns

VCC = 4.5 V to 5.5 V

CL = 15 pF

-

4.5

7.8

1.0

9.2

1.0

10.0

ns

CL = 50 pF

-

6.0

9.7

1.0

11.0

1.0

12.5

ns

CPD

power

dissipation

capacitance

CL = 50 pF; fi = 1 MHz;

VI = GND to VCC

[3]

-12

-

pF

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