74LVC244ABQ(2009) 데이터 시트보기 (PDF) - NXP Semiconductors.

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74LVC244ABQ
(Rev.:2009)

Octal buffer/line driver; 3-state

NXP Semiconductors. 

NXP Semiconductors

74LVC244A; 74LVCH244A

Octal buffer/line driver; 3-state

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

Min Typ[2] Max

CPD

power

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

10

-

dissipation

capacitance

−40 °C to +125 °C Unit

Min

Max

-

- pF

[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(CL × VCC2 × fo) = sum of the outputs.

11. AC waveforms

VI

nAn input

GND

VOH

tPLH

nYn output

VOL

VM

VM

VM

tPHL

VM

mna171

Fig 6.

Measurement points are given in Table 8.

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

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

74LVC_LVCH244A_6

Product data sheet

Rev. 06 — 13 August 2009

© NXP B.V. 2009. All rights reserved.

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