The HI-546, HI-547, HI-548 and HI-549 are analog

multiplexers with active overvoltage protection and

guaranteed rON matching. Analog input levels may greatly

exceed either power supply without damaging the device or

disturbing the signal path of other channels. Active

protection circuitry assures that signal fidelity is maintained

even under fault conditions that would destroy other

multiplexers.

Analog inputs can withstand constant 70VP-P levels with

?15V supplies. Digital inputs will also sustain continuous

faults up to 4V greater than either supply. In addition, signal

sources are protected from short circuiting should

multiplexer supply loss occur. Each input presents 1k? of

resistance under this condition. These features make the

HI-546, HI-547, HI-548 and HI-549 ideal for use in systems

where the analog inputs originate from external equipment

or separately powered circuitry. All devices are fabricated

with 44V Dielectrically Isolated CMOS technology. The

HI-546 is a single 16-Channel, the HI-547 is an 8-Channel

differential, the HI-548 is a single 8-Channel and the HI-549

is a 4-Channel differential device. If input overvoltage

protection is not needed the HI-506/507/508/509

multiplexers are recommended. For further information see

Application Notes AN520 and AN521.

Features

? Analog Overvoltage Protection. . . . . . . . . . . . . . . . . . 70VP-P

? No Channel Interaction During Overvoltage

? Guaranteed rON Matching

? Maximum Power Supply . . . . . . . . . . . . . . . . . . . . . . 44V

? Break-Before-Make Switching

? Analog Signal Range . . . . . . . . . . . . . . . . . . . . . . . . ?15V

? Access Time (Typical) . . . . . . . . . . . . . . . . . . . . . . . 500ns

? Standby Power (Typical) . . . . . . . . . . . . . . . . . . . . 7.5mW

? Pb-Free Plus Anneal Available (RoHS Compliant)

Applications

? Data Acquisition

? Industrial Controls

? Telemetry