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74F258A Datasheet

Quad 2-Input Multiplexer with TRI-STATE Outputs

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November 1994
54F 74F258A
Quad 2-Input Multiplexer with TRI-STATE Outputs
General Description
The ’F258A is a quad 2-input multiplexer with TRI-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 the complement (inverted) form The
outputs may be switched to a high impedance state with a
HIGH on the common Output Enable (OE) input allowing
the outputs to interface directly with bus-oriented systems
Features
Y Multiplexer expansion by tying outputs together
Y Inverting TRI-STATE outputs
Y Guaranteed 4000V minimum ESD protection
Commercial
74F258APC
74F258ASC (Note 1)
74F258ASJ (Note 1)
Military
54F258ADM (Note 2)
54F258AFM (Note 2)
54F258ALL (Note 2)
Package
Number
N16E
J16A
M16A
M16D
W16A
E20A
Package Description
16-Lead (0 300 Wide) Molded Dual-In-Line
16-Lead Ceramic Dual-In-Line
16-Lead (0 150 Wide) Molded Small Outline JEDEC
16-Lead (0 300 Wide) Molded Small Outline EIAJ
16-Lead Cerpack
20-Lead Ceramic Leadless Chip Carrier Type C
Note 1 Devices also available in 13 reel Use suffix e SCX and SJX
Note 2 Military grade device with environmental and burn-in processing Use suffix e DMQB FMQB and LMQB
Logic Symbols
Connection Diagrams
Pin Assignment
for DIP SOIC and Flatpak
Pin Assignment
for LCC
IEEE IEC
TL F 9508–3
TL F 9508 – 1
TL F 9508 – 2
TL F 9508–5
TRI-STATE is a registered trademark of National Semiconductor Corporation
C1995 National Semiconductor Corporation TL F 9508
RRD-B30M75 Printed in U S A


National Semiconductor Electronic Components Datasheet

74F258A Datasheet

Quad 2-Input Multiplexer with TRI-STATE Outputs

No Preview Available !

Unit Loading Fan Out
Pin Names
S
OE
I0a – I0d
I1a – I1d
Za – Zd
Description
Common Data Select Input
TRI-STATE Output Enable Input (Active LOW)
Data Inputs from Source 0
Data Inputs from Source 1
TRI-STATE Inverting Data Outputs
54F 74F
UL
HIGH LOW
10 10
10 10
10 10
10 10
150 40 (33 3)
Input IIH IIL
Output IOH IOL
20 mA b0 6 mA
20 mA b0 6 mA
20 mA b0 6 mA
20 mA b0 6 mA
b3 mA 24 mA (20 mA)
Functional Description
The ’F258A is a quad 2-input multiplexer with TRI-STATE
outputs It selects four bits of data from two sources under
control of a common Select input (S) When the Select input
is LOW the I0x inputs are selected and when Select is
HIGH the I1x inputs are selected The data on the selected
inputs appears at the outputs in inverted form The ’F258A
is the logic implementation of a 4-pole 2-position switch
where the position of the switch is determined by the logic
levels supplied to the Select input The logic equation for
the outputs is shown below
Zn e OE  (I1n  S a I0n  S)
When the Output Enable input (OE) is HIGH the outputs are
forced to a high impedance OFF state If the outputs of the
TRI-STATE devices are tied together all but one device
must be in the high impedance state to avoid high currents
that would exceed the maximum ratings Designers should
ensure that Output Enable signals to TRI-STATE devices
whose outputs are tied together are designed so there is no
overlap
Truth Table
Output
Enable
OE
H
L
L
L
L
Select
Input
S
X
H
H
L
L
Data
Inputs
I0 I1
XX
XL
XH
LX
HX
Output
Z
Z
H
L
H
L
H e HIGH Voltage Level
L e LOW Voltage Level
X e Immaterial
Z e High Impedance
Logic Diagram
TL F 9508 – 4
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays
2


Part Number 74F258A
Description Quad 2-Input Multiplexer with TRI-STATE Outputs
Maker National Semiconductor
Total Page 8 Pages
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