LF13508 Datasheet, PDF (1/16 Pages) National Semiconductor (TI) – 8-Channel Analog Multiplexer

January 1995
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
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 _{JFET switches rather than CMOS}
Y _{No static discharge blow-out problem}
Y _{No SCR latch-up problems}
Y _{Analog signal range 11V} b_15V
Y _{Constant ‘‘ON’’ resistance for analog signals between}
b11V and 11V
Y _{‘‘ON’’ resistance 380 X typ}
Y _{Digital inputs compatible with TTL and CMOS}
Y _{Output enable control}
Y _{Break-before-make action tOFF}e_{0 2 ms tON}e_{2 ms typ}
Y _{Lower leakage devices available}
Functional Diagrams and Truth Tables
LF13508
LF13509
SWITCH
EN A2 A1 A0
ON
HLLL
H L LH
HLHL
H LHH
HHL L
HHLH
H HH L
HHHH
L XXX
S1
S2
S3
S4
S5
S6
S7
S8
NONE
EN A1 A0 ^SWITCH
PAIR ON
L XX
HLL
HLH
HHL
HHH
None
S1
S2
S3
S4
C1995 National Semiconductor Corporation TL H 5668
TL H 5668 – 1
RRD-B30M115 Printed in U S A