74LVC244ADB datasheet(8/18 Pages) NXP

8 / 18 page

74LVC_LVCH244A_6

Product data sheet

Rev. 06 — 13 August 2009

8 of 18

NXP Semiconductors

74LVC244A; 74LVCH244A

Octal buffer/line driver; 3-state

[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.

[3]

Typical values are measured at Tamb =25 °C and VCC = 3.3 V.

[4]

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

[5]

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

× f

o) = sum of the outputs.

11. AC waveforms

CPD

power

dissipation

capacitance

per buffer; VI = GND to VCC;VCC = 3.3 V [5]

-10-

Table 7.

Dynamic characteristics …continued

Voltages are referenced to GND (ground = 0 V). For test circuit see Figure 8.

Symbol Parameter

Conditions

−40 °C to +85 °C

−40 °C to +125 °C Unit

Min

Typ[2]

Max

Min

Max

Measurement points are given in Table 8.

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

Fig 6.

The input (nAn) to output (nYn) propagation delays

mna171

nAn input

nYn output

tPLH

tPHL

GND

VOH

VOL

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