Datasheet

74HC_HCT154_6 © NXP B.V. 2007. All rights reserved.
Product data sheet Rev. 06 — 12 February 2007 10 of 21
NXP Semiconductors
74HC154; 74HCT154
4-to-16 line decoder/demultiplexer
10. Dynamic characteristics
[1] t
pd
is the same as t
PLH
and t
PHL
[2] t
t
is the same as t
TLH
and t
THL
[3] C
PD
is used to determine the dynamic power dissipation (P
D
in µW).
P
D
=C
PD
× V
CC
2
× f
i
× N+Σ(C
L
× V
CC
2
× f
o
) where:
f
i
= input frequency in MHz;
f
o
= output frequency in MHz;
C
L
= output load capacitance in pF;
V
CC
= supply voltage in V;
N = number of load switching outputs;
Σ(C
L
× V
CC
2
× f
o
) = sum of the outputs.
Table 8. Dynamic characteristics
GND (ground = 0 V); C
L
= 50 pF unless otherwise specified; for test circuit, see Figure 9.
Symbol Parameter Conditions 25 °C −40 °C to +125 °C Unit
Min Typ Max Min Max
(85 °C)
Max
(125 °C)
74HC154
t
pd
propagation delay An to Yn; see Figure 7
[1]
V
CC
= 2.0 V - 36 150 - 190 225 ns
V
CC
= 4.5 V - 13 30 - 38 45 ns
V
CC
= 5 V; C
L
= 15 pF - 11 - - - - ns
V
CC
= 6.0 V - 10 26 - 33 38 ns
En to Yn; see Figure 8
V
CC
= 2.0 V - 39 150 - 190 225 ns
V
CC
= 4.5 V - 14 30 - 38 45 ns
V
CC
= 5 V; C
L
= 15 pF - 11 - - - - ns
V
CC
= 6.0 V - 11 26 - 33 38 ns
t
t
transition time see Figure 7 and 8
[2]
V
CC
= 2.0 V - 19 75 - 95 110 ns
V
CC
= 4.5 V - 7 15 - 19 22 ns
V
CC
= 6.0 V - 6 13 - 16 19 ns
C
PD
power dissipation
capacitance
per gate; V
I
= GND to
V
CC
[3]
-60----pF
74HCT154
t
pd
propagation delay An to Yn; see Figure 7
[1]
V
CC
= 4.5 V - 16 35 - 44 53 ns
V
CC
= 5 V; C
L
= 15 pF - 13 - - - - ns
En to Yn; see Figure 8
V
CC
= 4.5 V - 15 32 - 40 48 ns
V
CC
= 5 V; C
L
= 15 pF - 13 - - - - ns
t
t
transition time see Figure 7 and 8
[2]
V
CC
= 4.5 V - 7 15 - 19 22 ns
C
PD
power dissipation
capacitance
per gate; V
I
= GND to
(V
CC
− 1.5 V)
[3]
-60----pF