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參數資料
| 型號： | MC74F251N |
| 廠商： | MOTOROLA INC |
| 元件分類： | 通用總線功能 |
| 英文描述： | Processor Supervisory Circuits 5-SOT-23 -40 to 85 |
| 中文描述： | F/FAST SERIES, 8 LINE TO 1 LINE MULTIPLEXER, COMPLEMENTARY OUTPUT, PDIP16 |
| 封裝： | 648-08 |
| 文件頁數： | 1/3頁 |
| 文件大小： | 68K |
| 代理商： | MC74F251N |
4-117
FAST AND LS TTL DATA
8-INPUT MULTIPLEXER
WITH 3-STATE OUTPUTS
The MC54/74F251 is a high-speed 8-input digital multiplexer. It provides,
in one package, the ability to select one bit of data from up to eight sources.
It can be used as a universal function generator to generate any logic function
of four variables. Both assertion and negation outputs are provided.
Multifunctional Capacity
On-Chip Select Logic Decoding
Inverting and Noninverting 3-State Outputs
FUNCTIONAL DESCRIPTION
This device is a logical implementation of a single-pole, 8-position switch
with the switch position controlled by the state of three Select inputs, S0, S1,
S2. Both assertion and negation outputs are provided. The Output Enable in-
put (OE) is active LOW. When it is activated, the logic function provided at the
output is:
Z = OE
(I0
S0
S1
S2 + I1
S0
S1
S2 +
I2
S0
S1
S2 + I3
S0
S1
S2 +
I4
S0
S1
S2 + I5
S0
S1
S2 +
I6
S0
S1
S2 + I7
S0
S1
S2 +
When the Output Enable is HIGH, both outputs are in the high impedance
(high Z) state. This feature allows multiplexer expansion by tying the outputs
of up to 128 devices together. When the outputs of the 3-state devices are tied
together, all but one device must be in the high impedance state to avoid high
currents that would exceed the maximum ratings. The Output Enable signals
should be designed to ensure there is no overlap in the active LOW portion
of the enable voltages.
CONNECTION DIAGRAM
15
16
14
13
12
11
10
2
1
3
4
5
6
7
VCC
9
8
I4
GND
I5
I6
I7
S0
S1
S2
I3
I2
I1
I0
Z
Z
OE
FAST
SCHOTTKY TTL
8-INPUT MULTIPLEXER
WITH 3-STATE OUTPUTS
MC54/74F251
J SUFFIX
CERAMIC
CASE 620-09
N SUFFIX
PLASTIC
CASE 648-08
16
1
16
1
ORDERING INFORMATION
MC54FXXXJ
MC74FXXXN
MC74FXXXD
Ceramic
Plastic
SOIC
16
1
D SUFFIX
SOIC
CASE 751B-03
LOGIC SYMBOL
9
10
11
6
5
7
4
3
2
1
15
14
13
12
I3
I4
I2
I0
I1
S2
I6
I7
I5
OE
VCC = PIN 16
GND = PIN 8
S1S0
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相關代理商/技術參數 |
參數描述 |
|---|---|
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| MC74F253M | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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