2. ON channel turns off while fault exists.

4. Fast Switching Times.

5. Break-Before-Make Switching.

Switches are guaranteed break-before-make so that input

signals are protected against momentary shorting.

6. Trench Isolation Eliminates Latch-up.

A dielectric trench separates the p and n-channel MOSFETs

thereby preventing latch-up.

ORDERING GUIDE

Model

1

Temperature Range

Package Option

2

ADG508FBN

–40

°C to +85°C

N-16

ADG508FBRN

–40

°C to +85°C

R-16N

ADG508FBRW

–40

°C to +85°C

R-16W

ADG508FTQ

–55

°C to +125°C

Q-16

ADG509FBN

–40

°C to +85°C

N-16

ADG509FBRN

–40

°C to +85°C

R-16N

ADG509FBRW

–40

°C to +85°C

R-16W

ADG509FTQ

–55

°C to +125°C

Q-16

ADG528FBN

–40

°C to +85°C

N-18

ADG528FBP

–40

°C to +85°C

P-20A

ADG528FTQ

–55

°C to +125°C

Q-18

NOTES

numbers.

RN = 0.15" Small Outline IC (SOIC), RW = 0.3" Small Outline IC (SOIC).

FUNCTIONAL BLOCK DIAGRAMS

S1

S8

A0

D

ADG508F/ADG528F

A1 A2 EN

1 OF 8

DECODER

ADG528F

ONLY

WR

RS

S1A

A0

DA

ADG509F

A1

S4A

S1B

S4B

DB

EN

1 OF 4

DECODER

REV. C

Information furnished by Analog Devices is believed to be accurate and

reliable. However, no responsibility is assumed by Analog Devices for its

use, nor for any infringements of patents or other rights of third parties

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

a

ADG508F/ADG509F/ADG528F*

4/8 Channel Fault-Protected

Analog Multiplexers

*Patent Pending.

GENERAL DESCRIPTION

The ADG508F, ADG509F and ADG528F are CMOS analog

multiplexers, the ADG508F and ADG528F comprising eight

single channels and the ADG509F comprising four differential

channels. These multiplexers provide fault protection. Using a

series n-channel, p-channel, n-channel MOSFET structure,

both device and signal source protection is provided in the event

of an overvoltage or power loss. The multiplexer can withstand

continuous overvoltage inputs from –40 V to +55 V. During

fault conditions, the multiplexer input (or output) appears as an

open circuit and only a few nanoamperes of leakage current will

flow. This protects not only the multiplexer and the circuitry

driven by the multiplexer, but also protects the sensors or signal

sources that drive the multiplexer.

The ADG508F and ADG528F switch one of eight inputs to a

common output as determined by the 3-bit binary address lines

A0, A1 and A2. The ADG509F switches one of four differential

inputs to a common differential output as determined by the 2-

bit binary address lines A0 and A1. The ADG528F has on-chip

address and control latches that facilitate microprocessor inter-

facing. An EN input on each device is used to enable or disable

the device. When disabled, all channels are switched OFF.

PRODUCT HIGHLIGHTS

1. Fault Protection.

The ADG508F/ADG509F/ADG528F can withstand con-

tinuous voltage inputs from –40 V to +55 V. When a fault

occurs due to the power supplies being turned off, all the

channels are turned off and only a leakage current of a few

nanoamperes flows.

FEATURES

Low On Resistance (300

typ)

Fast Switching Times

Low Power Dissipation (3.3 mW max)

Fault and Overvoltage Protection (–40 V to +55 V)

All Switches OFF with Power Supply OFF

Analog Output of ON Channel Clamped Within Power

Supplies If an Overvoltage Occurs

Latch-Up Proof Construction

Break Before Make Construction

TTL and CMOS Compatible Inputs

APPLICATIONS

Existing Multiplexer Applications (Both Fault-Protected

and Nonfault-Protected)

New Designs Requiring Multiplexer Functions

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781/329-4700

World Wide Web Site: http://www.analog.com

Fax: 781/326-8703

© Analog Devices, Inc., 1998