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74HCT238BQ Fiches technique(PDF) 8 Page - NXP Semiconductors

No de pièce 74HCT238BQ
Description  3-to-8 line decoder/demultiplexer
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Fabricant  NXP [NXP Semiconductors]
Site Internet  http://www.nxp.com
Logo NXP - NXP Semiconductors

74HCT238BQ Fiches technique(HTML) 8 Page - NXP Semiconductors

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74HC_HCT238_3
© NXP B.V. 2007. All rights reserved.
Product data sheet
Rev. 03 — 16 July 2007
8 of 18
NXP Semiconductors
74HC238; 74HCT238
3-to-8 line decoder/demultiplexer
[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;
∑ (C
L × VCC
2
× f
o) = sum of outputs.
11. Waveforms
74HCT238
tpd
propagation delay
An to Yn; see Figure 6
[1]
VCC = 4.5 V
-
19
35
44
53
ns
VCC = 5.0 V; CL =15pF
-
18
-
-
-
ns
E3 to Yn; see Figure 6
[1]
VCC = 4.5 V
-
20
37
46
56
ns
VCC = 5.0 V; CL =15pF
-
20
-
-
-
ns
En to Yn or see Figure 7
[1]
VCC = 4.5 V
-
20
35
44
53
ns
VCC = 5.0 V; CL =15pF
-
21
-
-
-
ns
tt
transition time
VCC = 4.5 V;
see Figure 6 and Figure 7
[2]
-
7
15
19
22
ns
CPD
power dissipation
capacitance
per package;
VI = GND to VCC − 1.5 V
[3]
-76-
-
-
pF
Table 7.
Dynamic characteristics
GND = 0 V; test circuit see Figure 8.
Symbol Parameter
Conditions
25
°C
−40 °C to +125 °C
Min
Typ
Max
Max
(85
°C)
Max
(125
°C)
Unit
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
001aag757
An, E3 input
Yn output
tTHL
tTLH
VM
VM
VX
VY
tPHL
tPLH


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