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參數(shù)資料
| 型號： | 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)： | 1/7頁 |
| 文件大小： | 43K |
| 代理商： | CD74HC138SM |
1
Data sheet acquired from Harris Semiconductor
SCHS147A
Features
Select One Of Eight Data Outputs
Active Low for 138, Active High for 238
l/O Port or Memory Selector
Three Enable Inputs to Simplify Cascading
Typical Propagation Delay of 13ns at V
CC
= 5V,
C
L
= 15pF, T
A
= 25
o
C
Fanout (Over Temperature Range)
- Standard Outputs. . . . . . . . . . . . . . . 10 LSTTL Loads
- Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads
Wide Operating Temperature Range . . . -55
o
C to 125
o
C
Balanced Propagation Delay and Transition Times
Significant Power Reduction Compared to LSTTL
Logic ICs
HC Types
- 2V to 6V Operation
- High Noise Immunity: N
IL
= 30%, N
IH
= 30% of V
CC
at V
CC
= 5V
HCT Types
- 4.5V to 5.5V Operation
- Direct LSTTL Input Logic Compatibility,
V
IL
= 0.8V (Max), V
IH
= 2V (Min)
- CMOS Input Compatibility, I
l
≤
1
μ
A at V
OL
, V
OH
Pinout
CD74HC138, CD74HCT138, CD74HC238, CD74HCT238
(PDIP, SOIC)
TOP VIEW
Signal names in parentheses are for ’HC238 and ’HCT238.
14
15
16
9
13
12
11
10
1
2
3
4
5
7
6
8
A0
A1
A2
E1
E2
E3
GND
(Y7) Y7
V
CC
Y1 (Y1)
Y2 (Y2)
Y3 (Y3)
Y4 (Y4)
Y5 (Y5)
Y6 (Y6)
Y0 (Y0)
October 1997 - Revised February 1999
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
Copyright
1999, Texas Instruments Incorporated
CD74HC138, CD74HCT138,
CD74HC238, CD74HCT238
High Speed CMOS Logic 3-to-8 Line Decoder/
Demultiplexer Inverting and Non-Inverting
[ /Title
(CD74
HC138
,
CD74
HCT13
8,
CD74
HC238
,
CD74
HCT23
8)
/Sub-
ject
(High
Speed
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