74HC_HCT240

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© NXP Semiconductors N.V. 2016. All rights reserved.

Product data sheet

Rev. 4 — 25 February 2016

9 of 17

NXP Semiconductors

74HC240; 74HCT240

Octal buffer/line driver; 3-state; inverting

Test data is given in Table 9.

Definitions test circuit:

RT = Termination resistance should be equal to output impedance Zo of the pulse generator.

CL = Load capacitance including jig and probe capacitance.

RL = Load resistance.

S1 = Test selection switch.

Fig 8.

Test circuit for measuring switching times

Table 9.

Test data

Type

Input

Load

S1 position

VI

tr, tf

CL

RL

tPHL, tPLH

tPZH, tPHZ

tPZL, tPLZ

74HC240

VCC

6ns

15pF, 50 pF

1k



open

GND

VCC

74HCT240

3 V

6 ns

15 pF, 50 pF

1 k



open

GND

VCC