MP
C50
8
MPC508A
MPC509A
MP
C50
9
SBFS019A – JANUARY 1988 — REVISED OCTOBER 2003
Single-Ended 8-Channel/Differential 4-Channel
CMOS ANALOG MULTIPLEXERS
FEATURES
q
q
q
q
q
q
ANALOG OVERVOLTAGE PROTECTION: 70V
PP
NO CHANNEL INTERACTION DURING
OVERVOLTAGE
BREAK-BEFORE-MAKE SWITCHING
ANALOG SIGNAL RANGE:
±
15V
STANDBY POWER: 7.5mW typ
TRUE SECOND SOURCE
1kΩ
In 8
1kΩ
In 2
Decoder/
Driver
1kΩ
In 1
Out
FUNCTIONAL DIAGRAMS
DESCRIPTION
The MPC508A is an 8-channel single-ended analog
multiplexer and the MPC509A is a 4-channel differential
multiplexer.
The MPC508A and MPC509A multiplexers have input
overvoltage protection. Analog input voltages may exceed
either power supply voltage without damaging the device or
disturbing the signal path of other channels. The protection
circuitry assures that signal fidelity is maintained even under
fault conditions that would destroy other multiplexers. Analog
inputs can withstand 70V
PP
signal levels and standard ESD
tests. Signal sources are protected from short circuits should
multiplexer power loss occur; each input presents a 1kΩ
resistance under this condition. Digital inputs can also sustain
continuous faults up to 4V greater than either supply voltage.
These features make the MPC508A and MPC509A ideal for
use in systems where the analog signals originate from
external equipment or separately powered sources.
The MPC508A and MPC509A are fabricated with Burr-
Brown’s dielectrically isolated CMOS technology. The
multiplexers are available in plastic DIP and plastic SOIC
packages. Temperature range is –40°C to +85°C.
Overvoltage
Clamp and
Signal
Isolation
NOTE: (1) Digital
Input Protection.
MPC508A
5V
Ref
Level
Shift
(1) (1)
(1)
(1)
A
0
A
1
A
2
EN
1kΩ
In 1A
1kΩ
In 4A
1kΩ
In 1B
1kΩ
In 4B
Overvoltage
Clamp and
Signal
Isolation
NOTE: (1) Digital
Input Protection.
MPC509A
Out B
Decoder/
Driver
Out A
5V
Ref
Level
Shift
(1) (1)
(1)
A
0
A
1
EN
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PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
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testing of all parameters.
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