LF13508M NSC [National Semiconductor], LF13508M Datasheet

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LF13508M

Manufacturer Part Number
LF13508M
Description
8-Channel Analog Multiplexer
Manufacturer
NSC [National Semiconductor]
Datasheet
C 1995 National Semiconductor Corporation
LF13508 8-Channel Analog Multiplexer
LF13509 4-Channel Differential Analog Multiplexer
General Description
The LF13508 is an 8-channel analog multiplexer which con-
nects the output to 1 of the 8 analog inputs depending on
the state of a 3-bit binary address An enable control allows
disconnecting the output thereby providing a package se-
lect function
This device is fabricated with National’s BI-FET technology
which provides ion-implanted JFETs for the analog switch
on the same chip as the bipolar decode and switch drive
circuitry This technology makes possible low constant
‘‘ON’’ resistance with analog input voltage variations This
device does not suffer from latch-up problems or static
charge blow-out problems associated with similar CMOS
parts The digital inputs are designed to operate from both
TTL and CMOS levels while always providing a definite
break-before-make action
The LF13509 is a 4-channel differential analog multiplexer
A 2-bit binary address will connect a pair of independent
Functional Diagrams and Truth Tables
TL H 5668
LF13508
LF13509
analog inputs to one of any 4 pairs of independent analog
outputs The device has all the features of the LF13508
series and should be used whenever differential analog in-
puts are required
Features
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
JFET switches rather than CMOS
No static discharge blow-out problem
No SCR latch-up problems
Analog signal range 11V
Constant ‘‘ON’’ resistance for analog signals between
b
‘‘ON’’ resistance 380
Digital inputs compatible with TTL and CMOS
Output enable control
Break-before-make action t
Lower leakage devices available
11V and 11V
TL H 5668 – 1
EN
H
H
H
H
H
H
H
H
L
EN
H
H
H
H
L
A2
H
H
H
H
L
L
L
L
X
typ
A1
X
H
H
L
L
b
A1
OFF
15V
H
H
H
H
X
L
L
L
L
A0
H
H
X
L
L
e
0 2 s t
A0
H
H
H
H
L
L
L
L
X
PAIR ON
SWITCH
RRD-B30M115 Printed in U S A
None
S1
S2
S3
S4
SWITCH
NONE
ON
January 1995
ON
S1
S2
S3
S4
S5
S6
S7
S8
e
2 s typ

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LF13508M Summary of contents

Page 1

LF13508 8-Channel Analog Multiplexer LF13509 4-Channel Differential Analog Multiplexer General Description The LF13508 is an 8-channel analog multiplexer which con- nects the output the 8 analog inputs depending on the state of a 3-bit binary address An ...

Page 2

Absolute Maximum Ratings If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Positive Supply Negative Supply ( Positive Analog Input Voltage (Note 1) Negative Analog Input Voltage ...

Page 3

... Cavity DIP (D) 100 C W Connection Diagrams LF13508 Dual-In-Line ( Small Outline (SO) Packages Order Number LF13508D See NS Package Number D16C Order Number LF13508M See NS Package Number M16A Order Number LF13508N See NS Package Number N16A AC Test Circuits and Switching Time Waveforms (T T ...

Page 4

AC Test Circuit and Switching Time Waveforms Transition Times and Transients (Continued) FIGURE 2 Enable Times FIGURE 3 Break-Before-Make TL H 5668– 5668– 5668– 5668 – 5668 ...

Page 5

Typical Performance Characteristics ‘‘ON’’ Resistance Switch Leakage Currents Switching Times (Figures 1 and 3) Bias Currents ‘‘ON’’ Resistance ‘‘ON’’ Resistance Switch Leakage Switch Leakage Currents Currents Enable Delay Times ‘‘OFF’’ Isolation and (Figure 2) Crosstalk Supply Currents Switch Capacitances 5 ...

Page 6

Application Hints The LF11508 series is an 8-channel analog multiplexer which allows the connection of a single load differ- ent analog inputs These multiplexers incorporate JFETs in a switch configuration which insures a constant ‘‘ON’’ resist- ...

Page 7

Typical Applications A SIMPLIFIED SYSTEM DISCUSSION Analog multiplexers (MUX) are usually used for multi-chan- nel Data Acquisition Units (DAU) Figure 5 shows a system in which 8 different analog inputs are sampled and convert- ed into digital words for further ...

Page 8

Typical Applications (Continued) B SPEED CONSIDERATIONS In the system of Figure 5 with the S H omitted if n-bit accu- racy is desired the change of the analog input voltage should be less than 1 2 LSB over the A ...

Page 9

Typical Applications (Continued) FIGURE 7a Sequentially Multiplexed DAU with Sample and Hold FIGURE 7b Timing Diagram 9 EOC End of Conversion SC Start Conversion TL H 5668 – 14 ...

Page 10

Typical Applications (Continued) D DOUBLING THE SYSTEM CHANNEL CAPABILITY This is done in two different ways First we can use second level multiplexing with speed benefits as shown in Figure 9 A fast 2-channel multiplexer made by the dual analog ...

Page 11

Typical Applications (Continued) FIGURE 9a A Fast 16-Channel DAU with Second Level Multiplexing FIGURE 9b Timing Diagram 5668 – 16 ...

Page 12

Typical Applications (Continued) FIGURE 10 A 16-Channel Multiplexer with Sequential Multiplexing TL H 5668 – ...

Page 13

Schematic Diagrams LF13508 13 ...

Page 14

Schematic Diagrams (Continued) LF13509 14 ...

Page 15

... Physical Dimensions inches (millimeters) Order Number LF13508D or LF13509D 16-Lead (0 150 Wide) Molded Small Outline Package JEDEC (SO) Order Number LF13508M or LF13509M Dual-In-Line Package (D) NS Package D16C NS Package Number M16A 15 ...

Page 16

Physical Dimensions inches (millimeters) (Continued) Order Number LF13508N or LF13509N LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMICONDUCTOR ...

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