8-Channel/4-Channel Fault-Protected Analog Multiplexers ADG508F/ADG509F FEATURES FUNCTIONAL BLOCK DIAGRAMS All switches off with power supply off ADG508F Analog output of on channel clamped within power supplies if an overvoltage occurs S1 Latch-up proof construction Low on resistance (270 typical) Fast switching times D t : 230 ns maximum ON t : 130 ns maximum OFF Low power dissipation (3.3 mW maximum) S8 Fault and overvoltage protection (40 V to +55 V) 1 OF 8 Break-before-make construction DECODER TTL and CMOS compatible inputs A0 A1 A2 EN APPLICATIONS Figure 1. Existing multiplexer applications (both fault-protected and nonfault-protected) ADG509F New designs requiring multiplexer functions S1A GENERAL DESCRIPTION DA S4A The ADG508F and ADG509F are CMOS analog multi- plexers, with the ADG508F comprising eight single channels and the ADG509F comprising four differential channels. These S1B multiplexers provide fault protection. Using a series n-channel, DB p-channel, n-channel MOSFET structure, both device and signal S4B source protection is provided in the event of an overvoltage or 1 OF 4 power loss. The multiplexer can withstand continuous overvolt- DECODER age inputs from 40 V to +55 V. During fault conditions with power supplies off, the multiplexer input (or output) appears as A0 A1 EN an open circuit and only a few nanoamperes of leakage current Figure 2. will flow. This protects not only the multiplexer and the circuitry driven by the multiplexer, but also protects the sensors or signal PRODUCT HIGHLIGHTS sources that drive the multiplexer. 1. Fault protection. The ADG508F/ADG509F can withstand The ADG508F switches one of eight inputs to a common output continuous voltage inputs from 40 V to +55 V. When a as determined by the 3-bit binary address lines A0, A1, and A2. fault occurs due to the power supplies being turned off, all The ADG509F switches one of four differential inputs to a the channels are turned off and only a leakage current of a common differential output as determined by the 2-bit binary few nanoamperes flows. address lines A0 and A1. An EN input on each device is used 2. On channel saturates while fault exists. to enable or disable the device. When disabled, all channels are 3. Low R . ON switched off. 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. Rev. F 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 www.analog.com license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Fax: 781.461.3113 20012011 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. 00035-101 00035-001ADG508F/ADG509F TABLE OF CONTENTS Features .............................................................................................. 1 Absolute Maximum Ratings ............................................................5 Applications....................................................................................... 1 ESD Caution...................................................................................5 General Description ......................................................................... 1 Pin Configuration and Function Descriptions..............................6 Functional Block Diagrams............................................................. 1 Typical Performance Characteristics ..............................................8 Product Highlights ........................................................................... 1 Terminology.................................................................................... 10 Revision History ............................................................................... 2 Theory of Operation ...................................................................... 11 Specifications..................................................................................... 3 Test Circuits..................................................................................... 12 Dual Supply ................................................................................... 3 Outline Dimensions....................................................................... 15 Truth Tables................................................................................... 4 Ordering Guide .......................................................................... 17 REVISION HISTORY 7/11Rev. E to Rev. F Deleted ADG528F ..............................................................Universal Changes to Features Section and General Description Section . 1 Changes to Specifications Section.................................................. 3 Deleted Timing Diagrams Section ................................................. 4 Changes to Table 4............................................................................ 5 Added Table 5.................................................................................... 6 Added Table 6.................................................................................... 7 Replaced Typical Performance Characteristics Section .............. 8 Changes to Terminology Section.................................................. 10 Changes to Figure 27 and Figure 28............................................. 13 Changes to Figure 31...................................................................... 14 Changes to Theory of Operation Section.................................... 11 Updated Outline Dimensions ....................................................... 15 Changes to Ordering Guide .......................................................... 17 7/09Rev. D: Rev. E Updated Format..................................................................Universal Added TSSOP .....................................................................Universal Updated Outline Dimensions ....................................................... 15 Changes to Ordering Guide .......................................................... 18 4/01Data Sheet Changed from Rev. C to Rev. D. Changes to Ordering Guide ............................................................ 1 Changes to Specifications Table...................................................... 2 Max Ratings Changed...................................................................... 4 Deleted 16-Lead Cerdip from Outline Dimensions .................. 11 Deleted 18-Lead Cerdip from Outline Dimensions .................. 12 Rev. F Page 2 of 20