74AHC138 데이터 시트보기 (PDF) - NXP Semiconductors.
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74AHC138 Datasheet PDF : 17 Pages
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Nexperia
74AHC138; 74AHCT138
3-to-8 line decoder/demultiplexer; inverting
Table 7. Dynamic characteristics …continued
GND = 0 V; For test circuit see Figure 8.
Symbol Parameter Conditions
25 C
40 C to +85 C 40 C to +125 C Unit
Min Typ[1] Max Min
Max
Min
Max
For type 74AHCT138
tpd
propagation An to Yn; see Figure 6
[2]
delay
VCC = 4.5 V to 5.5 V
CL = 15 pF
- 4.4 10.4 1.0
12.0
1.0
13.0 ns
CL = 50 pF
- 6.2 11.4 1.0
13.0
1.0
14.5 ns
E3 to Yn; see Figure 6
[2]
VCC = 4.5 V to 5.5 V
CL = 15 pF
- 4.3 9.1 1.0
10.5
1.0
11.5 ns
CL = 50 pF
-
6.2 10.1 1.0
11.5
1.0
13.0 ns
E1, E2 to Yn; see Figure 7 [2]
VCC = 4.5 V to 5.5 V
CL = 15 pF
-
4.3 9.6 1.0
11.0
1.0
12.0 ns
CL = 50 pF
- 6.2 10.6 1.0
12.0
1.0
13.5 ns
CPD
power
CL = 50 pF; fi = 1 MHz;
[4] - 23.0 -
-
-
-
-
pF
dissipation VI = GND to VCC
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] Skew between any two outputs of the same package switching in the same direction. This parameter is guaranteed by design.
[4] CPD is used to determine the dynamic power dissipation (PD in W).
PD = CPD VCC2 fi N + (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
(CL VCC2 fo) = sum of the outputs.
11. Waveforms
VCC
An, E3 input
GND
VOH
Yn output
VOL
VM
tPHL
VM
tPLH
001aah080
Fig 6.
Measurement points are given in Table 8.
VOL and VOH are typical voltage output levels that occur with the output load.
The inputs An, E3 to outputs Yn propagation delays
74AHC_AHCT138
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 4 — 2 April 2014
© Nexperia B.V. 2017. All rights reserved
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