74HC238PW,118 데이터 시트보기 (PDF) - NXP Semiconductors.
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74HC238PW,118 Datasheet PDF : 18 Pages
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NXP Semiconductors
74HC238; 74HCT238
3-to-8 line decoder/demultiplexer
Table 7. Dynamic characteristics
GND = 0 V; test circuit see Figure 8.
Symbol Parameter
Conditions
Min
74HCT238
tpd
propagation delay An to Yn; see Figure 6
VCC = 4.5 V
VCC = 5.0 V; CL = 15 pF
E3 to Yn; see Figure 6
VCC = 4.5 V
VCC = 5.0 V; CL = 15 pF
En to Yn or see Figure 7
VCC = 4.5 V
VCC = 5.0 V; CL = 15 pF
tt
transition time
VCC = 4.5 V;
see Figure 6 and Figure 7
CPD
power dissipation per package;
capacitance
VI = GND to VCC − 1.5 V
[1]
-
-
[1]
-
-
[1]
-
-
[2]
-
[3]
-
[1] tpd is the same as tPHL and tPLH.
[2] tt is the same as tTHL and tTLH.
[3] CPD is used to determine the dynamic power dissipation (PD in µW):
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 outputs.
25 °C
Typ
19
18
20
20
20
21
7
76
−40 °C to +125 °C
Max Max
Max Unit
(85 °C) (125 °C)
35
44
-
-
37
46
-
-
35
44
-
-
15
19
-
-
53 ns
- ns
56 ns
- ns
53 ns
- ns
22 ns
- pF
11. Waveforms
An, E3 input
VM
Yn output
tPHL
VY
tTHL
VM
VX
tPLH
tTLH
001aag757
Measurement points are given in Table 8.
VOL and VOH are typical voltage output levels that occur with the output load.
Fig 6. Input (An, E3) to output (Yn) propagation delays and output transition times
74HC_HCT238_3
Product data sheet
Rev. 03 — 16 July 2007
© NXP B.V. 2007. All rights reserved.
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