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74HCT138N View Datasheet(PDF) - Texas Instruments

Part NameDescriptionManufacturer
74HCT138N 3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS TI
Texas Instruments TI
74HCT138N Datasheet PDF : 21 Pages
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SN54HCT138, SN74HCT138
3ĆLINE TO 8ĆLINE DECODERS/DEMULTIPLEXERS
SCLS171E − MARCH 1984 − REVISED SEPTEMBER 2003
recommended operating conditions (see Note 3)
SN54HCT138
MIN NOM MAX
SN74HCT138
UNIT
MIN NOM MAX
VCC
VIH
VIL
VI
VO
t/v
Supply voltage
High-level input voltage
Low-level input voltage
Input voltage
Output voltage
Input transition rise/fall time
VCC = 4.5 V to 5.5 V
VCC = 4.5 V to 5.5 V
4.5
5 5.5 4.5
5 5.5 V
2
2
V
0.8
0.8 V
0
VCC
0
VCC V
0
VCC
0
VCC V
500
500 ns
TA
Operating free-air temperature
−55
125 −40
85 °C
NOTE 3: All unused inputs of the device must be held at VCC or GND to ensure proper device operation. Refer to the TI application report,
Implications of Slow or Floating CMOS Inputs, literature number SCBA004.
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
VCC
TA = 25°C
SN54HCT138 SN74HCT138
MIN TYP MAX MIN MAX MIN MAX
VOH
VOL
II
ICC
ICC†
VI = VIH or VIL
IOH = −20 µA
IOH = −4 mA
VI = VIH or VIL
IOL = 20 µA
IOL = 4 mA
VI = VCC or 0
VI = VCC or 0,
IO = 0
One input at 0.5 V or 2.4 V,
Other inputs at 0 or VCC
4.5 V
4.5 V
5.5 V
5.5 V
5.5 V
4.4 4.499
3.98 4.3
0.001
0.17
±0.1
0.1
0.26
±100
8
1.4 2.4
4.4
3.7
0.1
0.4
±1000
160
3
4.4
3.84
0.1
0.33
±1000
80
2.9
Ci
4.5 V
to 5.5 V
3
10
10
10
This is the increase in supply current for each input that is at one of the specified TTL voltage levels, rather than 0 V or VCC.
UNIT
V
V
nA
µA
mA
pF
switching characteristics over recommended operating free-air temperature range, CL = 50 pF
(unless otherwise noted) (see Figure 1)
PARAMETER
tpd
tt
FROM
(INPUT)
A, B, or C
Enable
TO
(OUTPUT)
Any Y
Any Y
Y
VCC
4.5 V
5.5 V
4.5 V
5.5 V
4.5 V
5.5 V
TA = 25°C
MIN TYP MAX
23
36
17
32
22
33
18
30
12
15
11
14
SN54HCT138
MIN MAX
54
49
50
45
22
20
SN74HCT138
MIN MAX
45
34
42
38
19
17
UNIT
ns
ns
operating characteristics, TA = 25°C
PARAMETER
Cpd Power dissipation capacitance
TEST CONDITIONS
No load
TYP UNIT
85 pF
4
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
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