SBFS019A – JANUARY 1988 — REVISED OCTOBER 2003

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PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

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MPC508A

MPC509A

FUNCTIONAL DIAGRAMS

Single-Ended 8-Channel/Differential 4-Channel

CMOS ANALOG MULTIPLEXERS

FEATURES

q

q

NO CHANNEL INTERACTION DURING

OVERVOLTAGE

q

BREAK-BEFORE-MAKE SWITCHING

q

ANALOG SIGNAL RANGE:

q

STANDBY POWER: 7.5mW typ

q

TRUE SECOND SOURCE

Level

Shift

1k

Ω

1k

Ω

1k

Ω

Overvoltage

Clamp and

Signal

Isolation

5V

Ref

Decoder/

Driver

NOTE: (1) Digital

Input Protection.

In 1A

In 1B

In 4B

MPC509A

A

EN

Out A

1k

Ω

In 4A

Out B

(1) (1)

(1)

Level

Shift

1k

Ω

1k

Ω

1k

Ω

Overvoltage

Clamp and

Signal

Isolation

5V

Ref

Decoder/

Driver

NOTE: (1) Digital

Input Protection.

In 1

In 2

In 8

MPC508A

A

EN

(1)

Out

(1)

(1)

(1)

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

tests. Signal sources are protected from short circuits should

multiplexer power loss occur; each input presents a 1k

Ω

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.

MPC508

MPC509