SN74LS257D

Manufacturer Part NumberSN74LS257D
DescriptionQUAD 2-INPUT MULTIPLEXER WITH 3-STATE OUTPUTS
ManufacturerMotorola
SN74LS257D datasheet
 
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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 (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.
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)
V CC
E 0
I 0c
I 1c
Z c
I 0d
I 1d
16
15
14
13
12
11
10
SN54/74LS257B
1
2
3
4
5
6
7
S
I 0a
I 1a
Z a
I 0b
I 1b
Z b
V CC
E 0
I 0c
I 1c
Z c
I 0d
I 1d
16
15
14
13
12
11
10
SN54/74LS258B
1
2
3
4
5
6
7
S
I 0a
I 1a
Z a
I 0b
I 1b
Z b
Z d
9
V CC = PIN 16
GND = PIN 8
8
GND
Z d
9
NOTE:
The Flatpak version
has the same pinouts
(Connection Diagram) as
the Dual In-Line Package.
8
GND
FAST AND LS TTL DATA
5-427
SN54/74LS257B
SN54/74LS258B
QUAD 2-INPUT MULTIPLEXER
WITH 3-STATE OUTPUTS
LOW POWER SCHOTTKY
J SUFFIX
CERAMIC
CASE 620-09
16
1
N SUFFIX
PLASTIC
CASE 648-08
16
1
D SUFFIX
SOIC
16
CASE 751B-03
1
ORDERING INFORMATION
SN54LSXXXJ
Ceramic
SN74LSXXXN
Plastic
SN74LSXXXD
SOIC

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 “ ...