74HC_HCT240_3

© NXP B.V. 2007. All rights reserved.

Product data sheet

Rev. 03 — 2 August 2007

9 of 18

NXP Semiconductors

74HC240; 74HCT240

Octal buffer/line driver; 3-state; inverting

Measurement points are given in Table 8.

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

Fig 7.

3-state enable and disable times

001aae014

tPLZ

tPHZ

outputs

disabled

outputs

enabled

VY

VX

outputs

enabled

nYn output

LOW-to-OFF

OFF-to-LOW

nYn output

HIGH-to-OFF

OFF-to-HIGH

nOE input

VI

VOL

VOH

VCC

VM

GND

GND

tPZL

tPZH

VM

VM

Table 8.

Measurement points

Type

Input

Output

VM

VM

VX

VY

74HC240

0.5

× VCC

0.5

× VCC

0.1

× VCC

0.9

× VCC

74HCT240

1.3 V

1.3 V

0.1

× VCC

0.9

× VCC