74ALVC245D datasheet(6/14 Pages) NXP

6 / 14 page

74ALVC245_2

Product data sheet

Rev. 02 — 7 January 2008

6 of 14

NXP Semiconductors

74ALVC245

Octal bus transceiver; 3-state

10. Dynamic characteristics

[1]

All typical values are measured at Tamb = 25 °C and VCC = 1.8 V, 2.5 V, 2.7 V and 3.3 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 in µW).

PD =CPD × VCC2 × fi × N+ Σ(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;

Σ(C

L × VCC

× 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

Unit

Min

Typ[1]

Max

tpd

propagation delay An to Bn; Bn to An; see Figure 5

[2]

VCC = 1.65 V to 1.95 V

1.0

2.7

6.0

VCC = 2.3 V to 2.7 V

1.0

2.1

3.5

VCC = 2.7 V

1.0

3.0

3.6

VCC = 3.0 V to 3.6 V

1.0

2.3

3.4

ten

enable time

OE to An; OE to Bn; see Figure 6

[2]

VCC = 1.65 V to 1.95 V

1.0

4.0

8.6

VCC = 2.3 V to 2.7 V

1.0

3.0

6.0

VCC = 2.7 V

1.0

2.6

6.3

VCC = 3.0 V to 3.6 V

1.0

2.9

5.5

tdis

disable time

OE to An; OE to Bn; see Figure 6

[2]

VCC = 1.65 V to 1.95 V

1.0

4.4

8.0

VCC = 2.3 V to 2.7 V

1.0

2.3

4.8

VCC = 2.7 V

1.0

3.3

5.3

VCC = 3.0 V to 3.6 V

1.0

3.2

5.5

CPD

power dissipation

capacitance

per buffer; VI = GND to VCC;VCC = 3.3 V

[3]

outputs enabled

outputs disabled

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