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參數(shù)資料
| 型號： | SN54HCT138FK |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS |
| 中文描述： | 3線至8線解碼器/解復(fù)用器 |
| 文件頁數(shù)： | 4/6頁 |
| 文件大?。?/td> | 95K |
| 代理商： | SN54HCT138FK |
SN54HCT138, SN74HCT138
3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS
SCLS171C – MARCH 1984 – REVISED MAY 1997
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
recommended operating conditions
SN54HCT138
MIN
NOM
SN74HCT138
MIN
NOM
UNIT
MAX
MAX
VCC
VIH
VIL
VI
VO
tt
TA
Supply voltage
4.5
5
5.5
4.5
5
5.5
V
High-level input voltage
VCC = 4.5 V to 5.5 V
VCC = 4.5 V to 5.5 V
2
2
V
Low-level input voltage
0
0.8
0
0.8
V
Input voltage
0
VCC
VCC
500
0
VCC
VCC
500
V
Output voltage
0
0
V
Input transition (rise and fall) time
0
0
ns
°
C
Operating free-air temperature
–55
125
–40
85
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
VCC
TA = 25
°
C
TYP
4.499
SN54HCT138
MIN
4.4
SN74HCT138
MIN
4.4
UNIT
MIN
4.4
MAX
MAX
MAX
VOH
VI= VIHor VIL
IOH = –20
μ
A
IOH = –4 mA
IOL = 20
μ
A
IOL = 4 mA
4 5 V
4.5 V
V
3.98
4.3
3.7
3.84
VOL
VI= VIHor VIL
VI = VIH or VIL
4 5 V
4.5 V
0.001
0.1
0.1
0.1
V
0.17
±
0.1
0.26
±
100
0.4
0.33
±
1000
II
ICC
VI = VCC or 0
VI = VCC or 0,
One input at 0.5 V or 2.4 V,
Other inputs at 0 or VCC
5.5 V
±
1000
160
nA
μ
A
IO = 0
5.5 V
8
80
ICC
5.5 V
1.4
2.4
3
2.9
mA
Ci
4.5 V
to 5.5 V
3
10
10
10
pF
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.
switching characteristics over recommended operating free-air temperature range, C
L
= 50 pF
(unless otherwise noted) (see Figure 1)
PARAMETER
FROM
(INPUT)
TO
VCC
TA = 25
°
C
TYP
SN54HCT138
MIN
SN74HCT138
MIN
UNIT
(OUTPUT)
MIN
MAX
MAX
MAX
A B or C
A, B, or C
Any Y
4.5 V
23
36
54
45
td
tpd
5.5 V
17
32
49
34
ns
Enable
Any Y
4.5 V
22
33
50
42
5.5 V
18
30
45
38
tt
Y
4.5 V
5.5 V
12
11
15
14
22
20
19
17
ns
operating characteristics, T
A
= 25
°
C
PARAMETER
TEST CONDITIONS
TYP
UNIT
Cpd
Power dissipation capacitance
No load
85
pF
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