74LVCH322245AEC datasheet(7/13 Pages) NXP

No de pièce	74LVCH322245AEC

Description	32-bit bus transceiver with direction pin; 30 W series

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Fabricant	NXP [NXP Semiconductors]

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74LVCH322245A_3

Product data sheet

Rev. 03 — 20 August 2007

7 of 13

NXP Semiconductors

74LVCH322245A

32-bit bus transceiver with direction pin, 30

Ω resistors

10. Dynamic characteristics

[1]

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

[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]

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 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 Volts

N = number of inputs switching

Σ(C

L × VCC

2

× f

o) = sum of the outputs.

11. Waveforms

Table 7.

Dynamic characteristics

Voltages are referenced to GND (ground = 0 V). For test circuit see Figure 6.

Symbol Parameter

Conditions

VCC (V)

Min

Typ[1]

Max

Unit

Tamb = −40 °C to +85 °C

tpd

propagation delay

nAn to nBn; nBn to nAn; see

Figure 4

1.2

[2]

-12-

ns

2.7

1.0

4.2

6.7

ns

3.0 to 3.6

1.0

3.3

5.7

ns

ten

enable time

nOE to nAn, nBn: see Figure 5

1.2

[2]

-18-

ns

2.7

1.5

5.1

8.5

ns

3.0 to 3.6

1.0

3.4

7.5

ns

tdis

disable time

nOE to nAn, nBn; see Figure 5

1.2

[2]

-10-

ns

2.7

1.5

3.5

7.5

ns

3.0 to 3.6

1.5

3.3

6.5

ns

tsk(o)

output skew time

3.0 to 3.6

[3]

-

1.0

ns

CPD

power dissipation

capacitance

per buffer; VI = GND to VCC

3.3

[4]

-28-

pF

VM = 1.5 V at VCC ≥ 2.7 V

VM = 0.5 × VCC at VCC < 2.7 V

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

Fig 4.

The input (nAn, nBn) to output (nBn, nAn) propagation delays

mna477

nAn, nBn

input

nBn, nAn

output

tPHL

tPLH

GND

VI

VM

VOH

VOL

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