4/8 Channel Fault-Protected
Analog Multiplexers
a
ADG508F/ADG509F/ADG528F*
FUNCTIONAL BLOCK DIAGRAMS
FEATURES
Low On Resistance (300 ⍀ Typ)
Fast Switching Times
tON 250 ns Max
ADG508F/ADG528F
ADG509F
tOFF 250 ns Max
S1
S1A
S4A
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
DA
DB
D
S1B
S4B
S8
WR
RS
ADG528F
ONLY
1 OF 8
DECODER
1 OF 4
DECODER
APPLICATIONS
Existing Multiplexer Applications (Both Fault-Protected
and Nonfault-Protected)
A0 A1 A2 EN
A1
A0
EN
New Designs Requiring Multiplexer Functions
2. ON channel turns off while fault exists.
3. Low RON.
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.
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
Temperature Range
Package Option*
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 differen-
tial 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.
ADG508FBN
ADG508FBRN
ADG508FBRW
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
N-16
R-16N
R-16W
ADG509FBN
ADG509FBRN
ADG509FBRW
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
N-16
R-16N
R-16W
ADG528FBN
ADG528FBP
–40°C to +85°C
–40°C to +85°C
N-18
P-20A
PRODUCT HIGHLIGHTS
1. Fault Protection.
*N = Plastic DIP; P = Plastic Leaded Chip Carrier (PLCC); RN = 0.15" Small
Outline IC (SOIC), RW = 0.3" Small Outline IC (SOIC).
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.
*Patent Pending.
REV. D
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© Analog Devices, Inc., 2001