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74LS257B Datasheet PDF

74LS257B
Motorola

Part Number 74LS257B
Description QUAD 2-INPUT MULTIPLEXER
Page 4 Pages
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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.
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 E0 I0c I1c Zc I0d I1d Zd
16 15 14 13 12 11 10 9
SN54/74LS257B
VCC = PIN 16
GND = PIN 8
1 2 3 4 56 78
S I0a I1a Za I0b I1b Zb GND
VCC E0 I0c I1c Zc I0d I1d Zd
16 15 14 13 12 11 10 9
SN54/74LS258B
1 2 3 4 56 78
S I0a I1a Za I0b I1b Zb GND
NOTE:
The Flatpak version
has the same pinouts
(Connection Diagram) as
the Dual In-Line Package.
SN54/74LS257B
SN54/74LS258B
QUAD 2-INPUT MULTIPLEXER
WITH 3-STATE OUTPUTS
LOW POWER SCHOTTKY
16
1
16
1
16
1
J SUFFIX
CERAMIC
CASE 620-09
N SUFFIX
PLASTIC
CASE 648-08
D SUFFIX
SOIC
CASE 751B-03
ORDERING INFORMATION
SN54LSXXXJ
SN74LSXXXN
SN74LSXXXD
Ceramic
Plastic
SOIC
FAST AND LS TTL DATA
5-1

















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74LS257B datasheet pdf
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