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74LVC_LVCH245A

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Product data sheet

Rev. 8 — 28 June 2013

7 of 18

Nexperia

74LVC245A; 74LVCH245A

Octal bus transceiver; 3-state

10. Dynamic characteristics

[1]

tpd is the same as tPLH and tPHL.

ten is the same as tPZL and tPZH.

tdis is the same as tPLZ and tPHZ.

[2]

Typical values are measured at Tamb =25 C and VCC = 1.2 V, 1.8 V, 2.5 V, 2.7 V and 3.3 V respectively.

[3]

Skew between any two outputs of the same package switching in the same direction. This parameter is guaranteed by design.

[4]

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 Volts

N = number of inputs switching

(C

L  VCC

2

 f

o) = sum of the outputs.

Table 7.

Dynamic characteristics

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

Symbol Parameter

Conditions

40 C to +85 C

40 C to +125 C Unit

Min

Typ[2]

Max

Min

Max

tpd

propagation

delay

nAn to nBn; nBn to nAn; see Figure 5

[1]

VCC = 1.2 V

-

17.0

-

-

-

ns

VCC = 1.65 V to 1.95 V

1.5

6.5

14.6

1.5

16.9

ns

VCC = 2.3 V to 2.7 V

1.0

3.4

7.6

1.0

8.7

ns

VCC = 2.7 V

1.5

3.4

7.3

1.5

9.5

ns

VCC = 3.0 V to 3.6 V

1.5

2.9

6.3

1.5

8.0

ns

ten

enable time

nOE to nAn, nBn; see Figure 6

[1]

VCC = 1.2 V

-

22.0

-

-

-

ns

VCC = 1.65 V to 1.95 V

1.9

8.3

19.5

1.9

22.5

ns

VCC = 2.3 V to 2.7 V

1.5

4.6

10.7

1.5

12.4

ns

VCC = 2.7 V

1.5

4.8

9.5

1.5

12.0

ns

VCC = 3.0 V to 3.6 V

1.5

3.7

8.5

1.5

11.0

ns

tdis

disable time

nOE to nAn, nBn; see Figure 6

[1]

VCC = 1.2 V

-

12.0

-

-

-

ns

VCC = 1.65 V to 1.95 V

2.9

5.5

12.3

2.9

14.2

ns

VCC = 2.3 V to 2.7 V

1.0

3.1

7.1

1.0

8.2

ns

VCC = 2.7 V

1.5

3.9

8.0

1.5

10.0

ns

VCC = 3.0 V to 3.6 V

1.7

3.6

7.0

1.7

9.0

ns

tsk(o)

output skew

time

[3]

-

-

1.0

-

1.5

ns

CPD

power

dissipation

capacitance

per input; VI =GND to VCC

[4]

VCC = 1.65 V to 1.95 V

-

7.7

-

-

-

pF

VCC = 2.3 V to 2.7 V

-

11.3

-

-

-

pF

VCC = 3.0 V to 3.6 V

-

14.4

-

-

-

pF