19-1414; Rev 5; 10/07
Fault-Protected, High-Voltage Single 8-to-1/
Dual 4-to-1 Multiplexers with Output Clamps
The MAX4508/MAX4509 are 8-to-1 and dual 4-to-1 faultprotected multiplexers that are pin compatible with the
industry-standard DG508/DG509. The MAX4508/
MAX4509 operate with dual supplies of ±4.5V to ±20V or
a single supply of +9V to +36V. These multiplexers feature fault-protected inputs, rail-to-rail signal handling
capability, and overvoltage clamping at 150mV beyond
the rails.
Both parts offer ±40V overvoltage protection with supplies off and ±25V protection with supplies on. Onresistance is 400Ω max and is matched between
channels to 15Ω max. All digital inputs have TTL logic
thresholds, ensuring both TTL and CMOS logic compatibility when using a single +12V supply or dual ±15V
supplies.
Features
♦ ±40V Fault Protection with Power Off
±25V Fault Protection with ±15V Supplies
♦ Rail-to-Rail Signal Handling
♦ No Power-Supply Sequencing Required
♦ All Channels Off with Power Off
♦ Output Clamped to Appropriate Supply Voltage
During Fault Condition
♦ 1kΩ Output Clamp Resistance During
Overvoltage
Ω
♦ 400Ω max On-Resistance
♦ 20ns Fault-Response Time
♦ ±4.5V to ±20V Dual Supplies
+9V to +36V Single Supply
♦ TTL/CMOS-Compatible Logic Inputs
Applications
Ordering Information
Data-Acquisition Systems
PART
TEMP
RANGE
MAX4508CSE+
MAX4508CPE+
MAX4508C/D
Industrial and Process Control
Avionics
Signal Routing
Redundant/Backup Systems
PINPACKAGE
PKG
CODE
0°C to +70°C
16 Narrow SO
S16-8
0°C to +70°C
16 Plastic DIP
P16-4
0°C to +70°C
Dice*
—
MAX4508ESE+
S16-8
-40°C to +85°C 16 Plastic DIP
P16-4
MAX4508MJE
Functional Diagrams/Truth Tables appear at end of
data sheet.
-40°C to +85°C 16 Narrow SO
MAX4508EPE+
-40°C to +85°C 16 CERDIP**
J16-3
Ordering Information continued at end of data sheet.
*Contact factory for dice specifications.
**Contact factory for availability.
+Denotes a lead-free package.
Pin Configurations/Functional Diagrams
TOP VIEW
MAX4508
A0 1
16 A1
LOGIC
A0 1
15 A2
EN 2
V- 3
MAX4509
EN 2
14 GND
V- 3
16 A1
15 GND
LOGIC
14 V+
NO1 4
13 V+
NO1A 4
13 NO1B
NO2 5
12 NO5
NO2A 5
12 NO2B
NO3 6
11 NO6
NO3A 6
11 NO3B
NO4 7
10 NO7
NO4A 7
10 NO4B
COM 8
9
NO8
COMA 8
9
SO/DIP
COMB
SO/DIP
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
MAX4508/MAX4509
General Description
Fault-Protected, High-Voltage Single 8-to-1/
Dual 4-to-1 Multiplexers with Output Clamps
(V+ = +15V, V- = -15V, VA_H = +2.4V, VA_L = +0.8V, VEN = +2.4V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at
TA = +25°C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
TA
MIN
TYP
MAX
UNITS
FAULT PROTECTION
Fault-Protected Analog Signal
Range (Notes 3, 4)
VNO_
Applies with power on, Figure 9
Applies with power off
+25°C
+25°C
COM_ Output Leakage Current,
Supplies On
ICOM_
VNO_= ±25V, VEN = 0
-25
+25
-40
+40
-20
+20
C, E
-1
+1
M
-100
+100
V
nA
µA
INO_
–
VNO_= ±25V, VCOM_ = +10V,
VEN = 0
VNO_= ±40V, VCOM = 0,
V+ = 0, V- = 0
VNO_ = +25V
-20
+20
C, E
-200
+200
M
-50
+50
µA
-20
+20
nA
C, E
-5
+5
M
NO_ Input Leakage Current,
Supplies Off
INO_
+25°C
+25°C
NO_ Input Leakage Current,
Supplies On
-100
+100
7
10
13
-13
-11
-7
100
1.0
2.5
nA
µA
COM_ On Clamp Output
Current, Supplies On
ICOM_
VCOM = 0
COM_ On Clamp Output
Resistance, Supplies On
RCOM_
VNO_ = ±25V
+25°C
± Fault Output Clamp Turn-On
Delay (Note 4)
RL = 10kΩ, VNO_ = ±25V
+25°C
20
ns
± Fault Recovery Time (Note 4)
RL = 10kΩ, VNO_ = ±25V
+25°C
2.5
µs
VNO_ = -25V
+25°C
mA
kΩ
LOGIC INPUT
A_ Input Logic Threshold High
VA_H
C, E, M
A_ Input Logic Threshold Low
VA_L
C, E, M
A_ Input Current Logic
High or Low
IA_H, IA_L
VA_= 0.8V or 2.4V
C, E, M
2.4
V
0.8
+1
-1
V
µA
SWITCH DYNAMIC CHARACTERISTICS
+25°C
Enable Turn-On Time
tON
VNO_ = ±10V, RL = 1kΩ,
Figures 2 and 3
160
C, E
M
Transition Time
tTRANS
Figure 2
170
C, E, M
VNO_ = ±10V, RL = 1kΩ,
Figures 2 and 3
350
500
120
Charge Injection (Note 4)
Off-Isolation (Note 7)
tBBM
Q
VISO
ns
200
C, E
250
M
Break-Before-Make Time Delay
(Note 4)
tOFF
ns
600
+25°C
+25°C
Enable Turn-Off Time
275
400
400
VNO_ = ±10V, RL = 1kΩ,
Figure 4
C, E, M
CL = 1.0nF, VNO_ = 0, RS = 0,
Figure 5
+25°C
2
RL = 75Ω, CL = 15pF,
VNO_ = 1VRMS, f = 1MHz, Figure 6
+25°C
-70
10
80
ns
ns
10
pC
dB
_______________________________________________________________________________________
3
MAX4508/MAX4509
ELECTRICAL CHARACTERISTICS—Dual Supplies (continued)
