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參數資料
| 型號： | MC74F257A |
| 廠商： | Motorola, Inc. |
| 英文描述： | QUAD 2-INPUT MULTIPLEXER WITH 3-STATE OUTPUTS |
| 中文描述： | 四2輸入多路復用器與三態輸出 |
| 文件頁數： | 1/3頁 |
| 文件大小： | 75K |
| 代理商： | MC74F257A |
4-127
FAST AND LS TTL DATA
QUAD 2-INPUT MULTIPLEXER
WITH 3-STATE OUTPUTS
The MC74F257 is a quad 2-input multiplexer with 3-state outputs. Four bits
of data from two sources can be selected using a common Data Select input.
The four outputs present the selected data in true (non-inverted) form. The
outputs may be switched to a high impedance state with a HIGH on the com-
mon Output Enable (OE) input, allowing the outputs to interface directly with
bus oriented systems.
Multiplexer Expansion by Tying Outputs Together
Non-Inverting 3-State Outputs
Input Clamp Diodes Limit High-Speed Termination Effects
AC Enhanced Version of the F257
CONNECTION DIAGRAM
15
16
14
13
12
11
10
2
1
3
4
5
6
7
VCC
9
8
GND
OE
I0c
I1c
Zc
I0d
I1d
S
I0a
I1a
Za
I0b
I1b
Zb
Zd
LOGIC DIAGRAM
I0b
Za
Zb
Zc
Zd
OE
I0a
I1b
I0c
I1c
I0d
I1d
S
I1a
FUNCTION TABLE
Output
Enable
Select
Input
Data
Inputs
Outputs
OE
H
S
X
I0
X
I1
X
Z
Z
L
H
X
L
L
L
H
X
H
H
L
L
L
X
L
L
L
H
X
H
N SUFFIX
PLASTIC
CASE 648-08
16
1
J SUFFIX
CERAMIC
CASE 620-09
16
1
MC54FXXXAJ
MC74FXXXAN Plastic
MC74FXXXAD SOIC
Ceramic
MC74F257A
QUAD 2-INPUT MULTIPLEXER
WITH 3-STATE OUTPUTS
FAST
SCHOTTKY TTL
ORDERING INFORMATION
16
1
D SUFFIX
SOIC
CASE 751B-03
LOGIC SYMBOL
VCC = PIN 16
GND = PIN 8
1
15
2
3
5
6
14
13
11
10
S
OE
I0a
I1a
I0b
I1b
I0c
I1c
I0d
I1d
4
7
12
9
Za
Zb
Zc
Zd
H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
Z = High Impedance
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相關代理商/技術參數 |
參數描述 |
|---|---|
| MC74F257A WAF | 制造商:ON Semiconductor 功能描述: |
| MC74F257AD | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MC74F257ADR2 | 制造商:Motorola Inc 功能描述: |
| MC74F257AM | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MC74F257AMEL | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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