74LVC244AD datasheet(9/19 Pages) NXP

9 / 19 page

74LVC_LVCH244A

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Product data sheet

Rev. 8 — 26 June 2013

9 of 19

NXP Semiconductors

74LVC244A; 74LVCH244A

Octal buffer/line driver; 3-state

11. AC waveforms

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

Measurement points are given in Table 8.

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

Fig 7.

3-state enable and disable times.

mna362

tPLZ

tPHZ

outputs

disabled

outputs

enabled

outputs

enabled

output

LOW-to-OFF

OFF-to-LOW

output

HIGH-to-OFF

OFF-to-HIGH

nOE input

VOL

VOH

VCC

GND

tPZL

tPZH

Table 8.

Measurement points

Supply voltage

Input

Output

VCC

1.2 V

VCC

0.5

 V

0.5

 V

VOL + 0.15 V

VOH  0.15 V

1.65 V to 1.95 V

VCC

0.5

 V

0.5

 V

VOL + 0.15 V

VOH  0.15 V

2.3 V to 2.7 V

VCC

0.5

 V

0.5

 V

VOL + 0.15 V

VOH  0.15 V

2.7 V

1.5 V

VOL + 0.3 V

VOH  0.3 V

3.0 V to 3.6 V

2.7 V

1.5 V

VOL + 0.3 V

VOH  0.3 V

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