SN74LS257D Motorola, SN74LS257D Datasheet

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SN74LS257D

Manufacturer Part Number
SN74LS257D
Description
QUAD 2-INPUT MULTIPLEXER WITH 3-STATE OUTPUTS
Manufacturer
Motorola
Datasheet
QUAD 2-INPUT MULTIPLEXER
WITH 3-STATE OUTPUTS
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 (E O ) 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.
The LSTTL / MSI SN54 / 74LS257B and the SN54 / 74LS258B are Quad
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
V CC
V CC
16
16
1
S
1
S
E 0
15
I 0a
E 0
15
I 0a
2
2
I 1a
I 1a
I 0c
14
I 0c
14
3
3
SN54/74LS257B
SN54/74LS258B
CONNECTION DIAGRAM DIP (TOP VIEW)
I 1c
I 1c
13
13
Z a
Z a
4
4
Z c
Z c
12
I 0b
12
I 0b
5
5
I 0d
I 0d
11
I 1b
11
I 1b
6
6
I 1d
I 1d
10
10
Z b
Z b
7
7
GND
GND
Z d
Z d
9
8
9
8
FAST AND LS TTL DATA
NOTE:
The Flatpak version
has the same pinouts
(Connection Diagram) as
the Dual In-Line Package.
V CC = PIN 16
GND = PIN 8
5-427
QUAD 2-INPUT MULTIPLEXER
SN54/74LS257B
SN54/74LS258B
16
16
WITH 3-STATE OUTPUTS
ORDERING INFORMATION
LOW POWER SCHOTTKY
16
1
SN54LSXXXJ
SN74LSXXXN
SN74LSXXXD
1
1
Ceramic
Plastic
SOIC
CASE 751B-03
CASE 620-09
CASE 648-08
CERAMIC
N SUFFIX
D SUFFIX
J SUFFIX
PLASTIC
SOIC

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SN74LS257D Summary of contents

Page 1

... HIGH on the common Output Enable ( In- put, allowing the outputs to interface directly with bus oriented systems 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 ...

Page 2

SN54/74LS257B LOGIC DIAGRAMS PIN 16 4 GND = PIN PIN NUMBERS D ...

Page 3

SN54/74LS257B FUNCTIONAL DESCRIPTION The LS257B and LS258B are Quad 2-Input Multiplexers with 3-state outputs. They select four bits of data from two sources each under control of a Common Data Select Input. When the Select Input is LOW, the I ...

Page 4

SN54/74LS257B DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE Symbol Symbol Parameter Parameter V IH Input HIGH Voltage Input LOW Voltage Input LOW Voltage V IK Input Clamp Diode Voltage Output HIGH Voltage Output ...

Page 5

G - 0.25 (0.010 - SEATING -T- PLANE 0.25 (0.010) ...

Page 6

... Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. “Typical” parameters can and do vary in different applications. All operating parameters, including “ ...

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