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74AHC139PW Datasheet PDF : 14 Pages
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NXP Semiconductors
74AHC139; 74AHCT139
Dual 2-to-4 line decoder/demultiplexer
10. Dynamic characteristics
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
tpd
propagation nAn to nYn; see Figure 5 [2]
delay
VCC = 3.0 V to 3.6 V
CL = 15 pF
- 5.5 11.0 1.0 13.0
1.0
14.0 ns
CL = 50 pF
- 7.9 14.5 1.0 16.5
1.0
18.5 ns
VCC = 4.5 V to 5.5 V
CL = 15 pF
- 3.9 7.2 1.0
8.5
1.0
9.0 ns
CL = 50 pF
- 5.6 9.2 1.0 10.5
1.0
11.5 ns
nE to nYn; see Figure 6
[2]
VCC = 3.0 V to 3.6 V
CL = 15 pF
- 4.8 9.2 1.0 11.0
1.0
11.5 ns
CL = 50 pF
- 6.9 12.7 1.0 14.5
1.0
16.0 ns
VCC = 4.5 V to 5.5 V
CL = 15 pF
- 3.4 6.3 1.0
7.5
1.0
8.0 ns
CL = 50 pF
- 4.9 8.3 1.0
9.5
1.0
10.5 ns
CPD
power
fi = 1 MHz; VI = GND to VCC [3] -
26 -
-
-
-
- pF
dissipation
capacitance
74AHCT139; VCC = 4.5 V to 5.5 V
tpd
propagation nAn to nYn; see Figure 5 [2]
delay
CL = 15 pF
- 4.7 7.2 1.0
8.5
1.0
9.0 ns
CL = 50 pF
- 6.5 9.2 1.0 10.5
1.0
11.5 ns
nE to nYn; see Figure 6
[2]
CL = 15 pF
- 3.6 6.3 1.0
7.5
1.0
8.0 ns
CL = 50 pF
- 5.2 8.3 1.0
9.5
1.0
10.5 ns
CPD
power
fi = 1 MHz; VI = GND to VCC [3] -
23 -
-
-
-
- pF
dissipation
capacitance
[1] Typical values are measured at nominal supply voltage (VCC = 3.3 V and VCC = 5.0 V).
[2] tpd is the same as tPLH and tPHL.
[3] CPD is used to determine the dynamic power dissipation (PD in µW).
PD = CPD × VCC2 × fi × N + Σ(CL × VCC2 × fo) where:
fi = input frequency in MHz;
fo = output frequency in MHz;
CL = output load capacitance in pF;
VCC = supply voltage in V;
N = number of inputs switching;
Σ(CL × VCC2 × fo) = sum of the outputs.
74AHC_AHCT139_2
Product data sheet
Rev. 02 — 9 May 2008
© NXP B.V. 2008. All rights reserved.
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