(LF13508) 4-Channel Differential Analog Multiplexer
Description
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 connects 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 select 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 inputs 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 b15V Constant ‘‘ON’’ resistance for analog signals between b 11V and 11V ‘‘ON’’ resistance 380 X typ Digital inputs compatible with TTL and CMOS Output enable control Break-before-make action tOFF e 0 2 ms tON 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 – 1
C1995 National Semiconductor Corporation
...
Similar Datasheet
