QUAD 2-INPUT MULTIPLEXER
WITH 3-STATE OUTPUTS
The LSTTL / MSI SN54 / 74LS257B and the SN54 / 74LS258B are Quad
2-Input Multiplexers 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 common Output Enable (EO) In-
put, allowing the outputs to interface directly with bus oriented systems. It is
fabricated with the Schottky barrier diode process for high speed and is com-
pletely compatible with all Motorola TTL families.
SN54/74LS257B
SN54/74LS258B
QUAD 2-INPUT MULTIPLEXER
WITH 3-STATE OUTPUTS
LOW POWER SCHOTTKY
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Schottky Process For High Speed
Multiplexer Expansion By Tying Outputs Together
Non-Inverting 3-State Outputs
Input Clamp Diodes Limit High Speed Termination Effects
Special Circuitry Ensures Glitch Free Multiplexing
ESD > 3500 Volts
CONNECTION DIAGRAM DIP
(TOP VIEW)
VCC
16
E0
15
I0c
14
I1c
13
Zc
12
I0d
11
I1d
10
Zd
9
J SUFFIX
CERAMIC
CASE 620-09
16
1
16
1
N SUFFIX
PLASTIC
CASE 648-08
SN54/74LS257B
VCC = PIN 16
GND = PIN 8
16
1
D SUFFIX
SOIC
CASE 751B-03
1
S
VCC
16
2
I0a
E0
15
3
I1a
I0c
14
4
Za
I1c
13
5
I0b
Zc
12
6
I1b
I0d
11
7
Zb
I1d
10
8
GND
Zd
9
ORDERING INFORMATION
SN54LSXXXJ
SN74LSXXXN
SN74LSXXXD
NOTE:
The Flatpak version
has the same pinouts
(Connection Diagram) as
the Dual In-Line Package.
Ceramic
Plastic
SOIC
SN54/74LS258B
1
S
2
I0a
3
I1a
4
Za
5
I0b
6
I1b
7
Zb
8
GND
FAST AND LS TTL DATA
5-427
54LS257相關(guān)型號(hào)PDF文件下載
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