74AHC_AHCT139_2 © NXP B.V. 2008. All rights reserved.
Product data sheet Rev. 02 — 9 May 2008 7 of 14
NXP Semiconductors
74AHC139; 74AHCT139
Dual 2-to-4 line decoder/demultiplexer
10. Dynamic characteristics
[1] Typical values are measured at nominal supply voltage (V
CC
= 3.3 V and V
CC
= 5.0 V).
[2] t
pd
is the same as t
PLH
and t
PHL
.
[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 inputs switching;
Σ(C
L
× V
CC
2
× f
o
) = sum of the outputs.
Table 7. Dynamic characteristics
Voltages are referenced to GND (ground = 0 V); for test circuit see Figure 7.
Symbol Parameter Conditions 25 °C −40 °C to +85 °C −40 °C to +125 °C Unit
Min Typ
[1]
Max Min Max Min Max
74AHC139
t
pd
propagation
delay
nAn to nYn; see Figure 5
[2]
V
CC
= 3.0 V to 3.6 V
C
L
= 15 pF - 5.5 11.0 1.0 13.0 1.0 14.0 ns
C
L
= 50 pF - 7.9 14.5 1.0 16.5 1.0 18.5 ns
V
CC
= 4.5 V to 5.5 V
C
L
= 15 pF - 3.9 7.2 1.0 8.5 1.0 9.0 ns
C
L
= 50 pF - 5.6 9.2 1.0 10.5 1.0 11.5 ns
n
EtonYn; see Figure 6
[2]
V
CC
= 3.0 V to 3.6 V
C
L
= 15 pF - 4.8 9.2 1.0 11.0 1.0 11.5 ns
C
L
= 50 pF - 6.9 12.7 1.0 14.5 1.0 16.0 ns
V
CC
= 4.5 V to 5.5 V
C
L
= 15 pF - 3.4 6.3 1.0 7.5 1.0 8.0 ns
C
L
= 50 pF - 4.9 8.3 1.0 9.5 1.0 10.5 ns
C
PD
power
dissipation
capacitance
f
i
= 1 MHz; V
I
= GND to V
CC
[3]
-26- - - - -pF
74AHCT139; V
CC
= 4.5 V to 5.5 V
t
pd
propagation
delay
nAn to nYn; see Figure 5
[2]
C
L
= 15 pF - 4.7 7.2 1.0 8.5 1.0 9.0 ns
C
L
= 50 pF - 6.5 9.2 1.0 10.5 1.0 11.5 ns
n
EtonYn; see Figure 6
[2]
C
L
= 15 pF - 3.6 6.3 1.0 7.5 1.0 8.0 ns
C
L
= 50 pF - 5.2 8.3 1.0 9.5 1.0 10.5 ns
C
PD
power
dissipation
capacitance
f
i
= 1 MHz; V
I
= GND to V
CC
[3]
-23- - - - -pF