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參數(shù)資料
| 型號(hào)： | CD74HC138SM |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | LM5575 SIMPLE SWITCHER® 75V, 1.5A Step-Down Switching Regulator; Package: TSSOP EXP PAD; No of Pins: 16 |
| 中文描述： | 高速CMOS邏輯3至8線路解碼器/多路解復(fù)用器反相和非反相 |
| 文件頁數(shù)： | 6/7頁 |
| 文件大小： | 43K |
| 代理商： | CD74HC138SM |
6
Enable to Output
HC/HCT138
t
PLH,
t
PHL
C
L
= 50pF
2
-
-
150
-
190
-
265
ns
4.5
-
-
30
-
38
-
53
ns
6
-
-
26
-
33
-
45
ns
Output Transition Time
(Figure 1)
t
TLH
, t
THL
C
L
= 50pF
2
-
-
75
-
95
-
110
ns
4.5
-
-
15
-
19
-
22
ns
6
-
-
13
-
16
-
19
ns
Power Dissipation
Capacitance, (Notes 5, 6)
C
PD
C
L
= 15pF
5
-
67
-
-
-
-
-
pF
Input Capacitance
C
IN
-
-
-
-
10
-
10
-
10
pF
HCT TYPES
Propagation Delay
Address to Output
t
PLH
, t
PHL
C
L
= 50pF
4.5
-
-
35
-
44
-
53
ns
C
L
= 15pF
5
-
14
-
-
-
-
-
ns
Enable to Output
HC/HCT138
t
PLH
, t
PHL
C
L
= 50pF
4.5
-
-
35
-
44
-
53
ns
Enable to Output
HC/HCT238
t
PLH,
t
PHL
C
L
= 15pF
4.5
-
-
40
-
50
-
60
ns
Output Transition Time
(Figure 2)
t
TLH
, t
THL
C
L
= 50pF
4.5
-
-
15
-
19
-
22
ns
Power Dissipation
Capacitance, (Notes 5, 6)
C
PD
C
L
= 15pF
5
-
67
-
-
-
-
-
pF
Input Capacitance
C
IN
-
-
-
-
10
-
10
-
10
pF
NOTES:
5. C
PD
is used to determine the dynamic power consumption, per gate.
6. P
D
= V
CC2
f
i
(C
PD
+ C
L
) where: f
i
= Input Frequency, C
L
= Output Load Capacitance, V
CC
= Supply Voltage.
Switching Specifications
Input t
r
, t
f
= 6ns
(Continued)
PARAMETER
SYMBOL
TEST
CONDITIONS
V
CC
(V)
25
o
C
-40
o
C TO
85
o
C
-55
o
C TO 125
o
C
UNITS
MIN
TYP
MAX
MIN
MAX
MIN
MAX
Test Circuits and Waveforms
FIGURE 7. HC AND HCU TRANSITION TIMES AND PROPAGA-
TION DELAY TIMES, COMBINATION LOGIC
FIGURE 8. HCT TRANSITION TIMES AND PROPAGATION
DELAY TIMES, COMBINATION LOGIC
t
PHL
t
PLH
t
THL
t
TLH
90%
50%
10%
50%
10%
INVERTING
OUTPUT
INPUT
GND
V
CC
t
r
= 6ns
t
f
= 6ns
90%
t
PHL
t
PLH
t
THL
t
TLH
2.7V
1.3V
0.3V
1.3V
10%
INVERTING
OUTPUT
INPUT
GND
3V
t
r
= 6ns
t
f
= 6ns
90%
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