FEATURES
ANALOG OVERVOLTAGE PROTECTION: 70VPP
NO CHANNEL INTERACTION DURING
OVERVOLTAGE
BREAK-BEFORE-MAKE SWITCHING
ANALOG SIGNAL RANGE: ±15V
STANDBY POWER: 7.5mW typ
TRUE SECOND SOURCE

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 70VPP 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.