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74F253 Datasheet

Dual 4-Input Multiplexer with TRI-STATE Outputs

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November 1994
54F 74F253
Dual 4-Input Multiplexer with TRI-STATE Outputs
General Description
The ’F253 is a dual 4-input multiplexer with TRI-STATE
outputs It can select two bits of data from four sources
using common select inputs The output may be individually
switched to a high impedance state with a HIGH on the
respective Output Enable (OE) inputs allowing the outputs
to interface directly with bus oriented systems
Features
Y Multifunction capability
Y Non-inverting TRI-STATE outputs
Y Guaranteed 4000V minimum ESD protection
Commercial
74F253PC
74F253SC (Note 1)
74F253SJ (Note 1)
Military
54F253DM (Note 2)
54F253FM (Note 2)
54F253LL (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 9505–3
TL F 9505 – 1
TL F 9505 – 2
TL F 9505–5
TRI-STATE is a registered trademark of National Semiconductor Corporation
C1995 National Semiconductor Corporation TL F 9505
RRD-B30M75 Printed in U S A


National Semiconductor Electronic Components Datasheet

74F253 Datasheet

Dual 4-Input Multiplexer with TRI-STATE Outputs

No Preview Available !

Unit Loading Fan Out
Pin Names
I0a – I3a
I0b – I3b
S0 – S1
OEa
OEb
Za Zb
Description
Side A Data Inputs
Side B Data Inputs
Common Select Inputs
Side A Output Enable Input (Active LOW)
Side B Output Enable Input (Active LOW)
TRI-STATE Outputs
54F 74F
UL
HIGH LOW
10 10
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
20 mA b0 6 mA
b3 mA 24 mA (20 mA)
Functional Description
This device contains two identical 4-input multiplexers with
TRI-STATE outputs They select two bits from four sources
selected by common Select inputs (S0 S1) The 4-input mul-
tiplexers have individual Output Enable (OEa OEb) inputs
which when HIGH force the outputs to a high impedance
(High Z) state This device is the logic implementation of a
2-pole 4-position switch where the position of the switch is
determined by the logic levels supplied to the two select
inputs The logic equations for the outputs are shown below
Za e OEa  (I0a  S1  S0 a I1a  S1  S0 a
I2a  S1  S0 a I3a  S1  S0)
Zb e OEb  (I0b  S1  S0 a I1b  S1  S0 a
I2b  S1  S0 a I3b  S1  S0)
If the outputs of 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 De-
signers should ensure that Output Enable signals to TRI-
STATE devices whose outputs are tied together are de-
signed so that there is no overlap
Logic Diagram
Truth Table
Select
Inputs
S0 S1
XX
LL
LL
HL
Data Inputs
I0 I1 I2 I3
XXXX
LXXX
HXXX
XLXX
Output
Enable
OE
H
L
L
L
Output
Z
Z
L
H
L
H L XHXX
L H XXLX
L H XXHX
H H XXXL
H H XXXH
L
L
L
L
L
Address inputs S0 and S1 are common to both sections
H e HIGH Voltage Level
L e LOW Voltage Level
X e Immaterial
Z e High Impedance
H
L
H
L
H
TL F 9505 – 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 74F253
Description Dual 4-Input Multiplexer with TRI-STATE Outputs
Maker National
Total Page 8 Pages
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