LF13508 8-Channel Analog Multiplexer
LF13509 4-Channel Differential 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鈥檚 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
鈥樷€極N鈥欌€?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
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
b
15V
Constant 鈥樷€極N鈥欌€?resistance for analog signals between
b
11V and 11V
鈥樷€極N鈥欌€?resistance 380
X
typ
Digital inputs compatible with TTL and CMOS
Output enable control
Break-before-make action t
OFF
e
0 2
ms
t
ON
e
2
ms
typ
Lower leakage devices available
Functional Diagrams and Truth Tables
LF13508
EN
H
H
H
H
H
H
H
H
L
LF13509
EN
L
H
H
H
H
A1
X
L
L
H
H
A0
X
L
H
L
H
SWITCH
PAIR ON
None
S1
S2
S3
S4
A2
L
L
L
L
H
H
H
H
X
A1
L
L
H
H
L
L
H
H
X
A0
L
H
L
H
L
H
L
H
X
SWITCH
ON
S1
S2
S3
S4
S5
S6
S7
S8
NONE
TL H 5668 鈥?1
C
1995 National Semiconductor Corporation
TL H 5668
RRD-B30M115 Printed in U S A