Datasheet

74HC_HCT240_3 © NXP B.V. 2007. All rights reserved.
Product data sheet Rev. 03 — 2 August 2007 7 of 18
NXP Semiconductors
74HC240; 74HCT240
Octal buffer/line driver; 3-state; inverting
10. Dynamic characteristics
Table 7. Dynamic characteristics
GND = 0 V; for load circuit see Figure 8.
Symbol Parameter Conditions 25 °C −40 °C to +125 °C Unit
Min Typ Max Max
(85 °C)
Max
(125 °C)
74HC240
t
pd
propagation delay nAn to nYn;
see
Figure 6
[1]
V
CC
= 2.0 V - 30 100 125 150 ns
V
CC
= 4.5 V - 11 20 25 30 ns
V
CC
= 5.0 V; C
L
=15pF - 9 - - - ns
V
CC
= 6.0 V - 9 17 21 26 ns
t
en
enable time nOE to nYn; see Figure 7
[2]
V
CC
= 2.0 V - 39 150 190 225 ns
V
CC
= 4.5 V - 14 30 38 45 ns
V
CC
= 6.0 V - 11 26 33 38 ns
t
dis
disable time nOE to nYn or see Figure 7
[3]
V
CC
= 2.0 V - 41 150 190 225 ns
V
CC
= 4.5 V - 15 30 38 45 ns
V
CC
= 6.0 V - 12 26 33 38 ns
t
t
transition time see Figure 6
[4]
V
CC
= 2.0 V - 14 60 75 90 ns
V
CC
= 4.5 V - 5 12 15 18 ns
V
CC
= 6.0 V - 4 10 13 15 ns
C
PD
power dissipation
capacitance
per transceiver;
V
I
= GND to V
CC
[5]
-30- - -pF