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74F138SC bảng dữ liệu(PDF) 2 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
tên linh kiện 74F138SC
Giải thích chi tiết về linh kiện  1-of-8 Decoder/Demultiplexer
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nhà sản xuất  NSC [National Semiconductor (TI)]
Trang chủ  http://www.national.com
Logo NSC - National Semiconductor (TI)

74F138SC bảng dữ liệu(HTML) 2 Page - National Semiconductor (TI)

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Unit LoadingFan Out
54F74F
Pin Names
Description
UL
Input IIH IIL
HIGHLOW
Output IOH IOL
A0–A2
Address Inputs
1010
20 mA b06 mA
E1 E2
Enable Inputs (Active LOW)
1010
20 mA b06 mA
E3
Enable Input (Active HIGH)
1010
20 mA b06 mA
O0–O7
Outputs (Active LOW)
50333
b
1 mA20 mA
Functional Description
The ’F138 high-speed 1-of-8 decoderdemultiplexer ac-
cepts three binary weighted inputs (A0 A1 A2) and when
enabled provides eight mutually exclusive active LOW out-
puts (O0–O7) The ’F138 features three Enable inputs two
active LOW (E1 E2) and one active HIGH (E3) All outputs
will be HIGH unless E1 and E2 are LOW and E3 is HIGH
This multiple enable function allows easy parallel expansion
of the device to a 1-of-32 (5 lines to 32 lines) decoder with
just four ’F138 devices and one inverter (See
Figure 1 ) The
’F138 can be used as an 8-output demultiplexer by using
one of the active LOW Enable inputs as the data input and
the other Enable inputs as strobes The Enable inputs which
are not used must be permanently tied to their appropriate
active HIGH or active LOW state
Truth Table
Inputs
Outputs
E1
E2
E3
A0
A1
A2
O0
O1
O2
O3
O4
O5
O6
O7
H
X
X
X
X
X
HH
H
HHHHH
X
H
X
X
X
X
H
H
H
HHHHH
X
X
L
X
X
X
HH
H
HHHHH
L
L
H
L
L
L
L
H
H
HHHHH
L
L
H
H
L
L
H
L
H
HHHHH
L
L
H
L
H
L
HH
L
HHHHH
L
L
H
H
H
L
HH
H
L
HHHH
L
L
H
L
L
H
HH
H
H
L
HHH
L
L
H
H
L
H
H
H
H
H
HLH
H
L
L
H
L
H
H
HH
H
HHH
L
H
L
L
H
H
H
H
HH
H
HHHH
L
H e HIGH Voltage Level
L e LOW Voltage Level
X e Immaterial
2


Số phần tương tự - 74F138SC

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Mô tả tương tự - 74F138SC

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