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PDF MAX4508 Data sheet ( Hoja de datos )
| Número de pieza | MAX4508 | |
| Descripción | Fault-Protected / High-Voltage Single 8-to-1/Dual 4-to-1 Multiplexers | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX4508 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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19-1414; Rev 0; 1/99
Fault-Protected, High-Voltage
Single 8-to-1/Dual 4-to-1 Multiplexers
General Description
The MAX4508/MAX4509 are 8-to-1 and dual 4-to-1 fault-
protected 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 fea-
ture fault-protected inputs, Rail-to-Rail® signal handling
capability, and overvoltage clamping at 150mV beyond
the rails.
Both parts offer ±40V overvoltage protection with sup-
plies off and ±25V protection with supplies on. On-
resistance is 400Ω max and is matched between
channels to 15Ωmax. All digital inputs have TTL logic
thresholds, ensuring both TTL and CMOS logic com-
patibility when using a single +12V supply or dual ±15V
supplies.
Applications
Data-Acquisition Systems
Industrial and Process Control
Avionics
Signal Routing
Redundant/Backup Systems
Functional Diagrams/Truth Tables appear at end of
data sheet.
Features
o ±40V Fault Protection with Power Off
±25V Fault Protection with ±15V Supplies
o Rail-to-Rail Signal Handling
o No Power-Supply Sequencing Required
o All Channels Off with Power Off
o Output Clamped to Appropriate Supply Voltage
During Fault Condition
o 1kΩ Output Clamp Resistance During
Overvoltage
o 400Ωmax On-Resistance
o 20ns Fault-Response Time
o ±4.5V to ±20V Dual Supplies
+9V to +36V Single Supply
o TTL/CMOS-Compatible Logic Inputs
Ordering Information
PART
TEMP. RANGE PIN-PACKAGE
MAX4508CAE
0°C to +70°C
16 SSOP
MAX4508CSE
0°C to +70°C
16 Narrow SO
MAX4508CPE
0°C to +70°C
16 Plastic DIP
MAX4508C/D
0°C to +70°C
Dice*
MAX4508EAE
-40°C to +85°C
16 SSOP
MAX4508ESE
-40°C to +85°C
16 Narrow SO
MAX4508EPE
-40°C to +85°C
16 Plastic DIP
MAX4508MJE
-55°C to +125°C 16 CERDIP**
Ordering Information continued at end of data sheet.
*Contact factory for dice specifications.
**Contact factory for availability.
Pin Configurations/Functional Diagrams
MAX4508
TOP VIEW
MAX4509
A0 1
EN 2
V- 3
NO1 4
NO2 5
NO3 6
NO4 7
COM 8
LOGIC
16 A1
15 A2
14 GND
13 V+
12 NO5
11 NO6
10 NO7
9 NO8
A0 1
EN 2
V- 3
NO1A 4
NO2A 5
NO3A 6
NO4A 7
COMA 8
LOGIC
16 A1
15 GND
14 V+
13 NO1B
12 NO2B
11 NO3B
10 NO4B
9 COMB
SSOP/SO/DIP
SSOP/SO/DIP
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
1 page  
Fault-Protected, High-Voltage
Single 8-to-1/Dual 4-to-1 Multiplexers
ELECTRICAL CHARACTERISTICS—Single +12V Supply (continued)
(V+ = +12V, V- = 0, 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
COM_ Off-Leakage Current
(Note 6)
SYMBOL
CONDITIONS
ICOM_(OFF)
VCOM_ = 10V, 1V;
VNO_ = 1V, 10V
MAX4508
MAX4509
COM_ On-Leakage Current
(Note 6)
VCOM_ = 10V, 1V;
ICOM_(ON) VNO_ = 10V, 1V, or
floating
MAX4508
MAX4509
FAULT PROTECTION
Fault-Protected Analog Signal
Range (Notes 3, 10)
VNO_
Applies with all power on
Applies with all power off
COM_ Output Leakage Current,
Supply On (Notes 3, 10)
ICOM_
VNO_ = ±25V, V+ = 12V
NO_ Input Leakage Current,
Supply On (Notes 3, 10)
INO_
VNO_ = ±25V, VCOM_ = 0,
V+ = 12V
NO_ Input Leakage Current,
Supply Off (Notes 3, 10)
INO_ VNO_= ±40V, V+ = 0, V- = 0
TA
+25°C
C, E
M
+25°C
C, E
M
+25°C
C, E
M
+25°C
C, E
M
+25°C
+25°C
C, E
M
+25°C
C, E
M
+25°C
C, E
M
MIN
-2
-20
-200
-1
-10
-100
-2
-25
-300
-1
-15
-150
TYP
MAX
2
20
200
1
10
100
2
25
300
1
15
150
UNITS
nA
nA
-25 25
V
-40 40
-20 20 nA
-20
-100
20
µA
100
-20 20 nA
-5
-100
5
µA
100
-20 0.1 20 nA
-5
-100
5
µA
100 µA
COM_ ON Output Current,
Supply On
ICOM_ VNO_ = 25V, V+ = 12V
+25°C
2
3
5 mA
COM_ ON Output Resistance,
Supply On
RCOM_ VNO_ = 25V, V+ = 12V
+25°C
2.4 6 kΩ
LOGIC INPUT
A_ Input Logic Threshold High
A_ Input Logic Threshold Low
A_ Input Current Logic
High or Low
VIN_H
VIN_L
IINH_,
IINL_
VIN_= 0.8V or 2.4V
C, E, M
1.8 2.4
C, E, M 0.8 1.8
C, E, M
-1 0.03
1
V
V
µA
_______________________________________________________________________________________ 5
5 Page 
Fault-Protected, High-Voltage
Single 8-to-1/Dual 4-to-1 Multiplexers
Normal Operation
Two comparators continuously compare the voltage on
the NO_ pin with V+ and V- supply voltages. When the
signal on NO_ is between V+ and V-, the multiplexer
behaves normally, with FETs N1 and P1 turning on and
off in response to A_ signals (Figure 1). The parallel
combination of N1 and P1 forms a low-value resistor
between NO_ and COM_ so that signals pass equally
well in either direction.
Positive Fault Condition
When the signal on NO_ exceeds V+ by about 150mV,
the positive fault comparator output goes high, turning
off FETs N1 and P1 (Figure 1). This makes the NO_ pin
high impedance, regardless of the switch state. If the
switch state is “off,” all FETs turn off, and both NO_ and
COM_ are high impedance. If the switch state is “on,”
FET P2 turns on, clamping COM_ to V+.
Negative Fault Condition
When the signal on NO_ goes about 150mV below V-,
the negative fault comparator output goes high, turning
off FETs N1 and P1 (Figure 1). This makes the NO_ pin
high impedance, regardless of the switch state. If the
switch state is “off,” all FETs turn off, and both NO_ and
COM_ are high impedance. If the switch state is “on,”
FET N2 turns on, clamping COM_ to V-.
Transient Fault Condition
When a fast rising or falling transient on NO_ exceeds
V+ or V-, the output (COM_) follows the input (NO_) to
the supply rail with only a few nanoseconds delay. This
delay is due to the switch on-resistance and circuit
capacitance to ground. When the input transient
returns to within the supply rails, however, there is a
longer output recovery time. For positive faults, the
recovery time is typically 2.5µs (see Typical Operating
Characteristics). For negative faults, the recovery time
is typically 1.3µs. These values depend on the COM_
output resistance and capacitance. The delays do not
depend on the fault amplitude. Higher COM_ output
resistance and capacitance increase the recovery
times.
COM and A_
FETs N2 and P2 can source about ±10mA from V+ or
V- to the COM_ pin in the fault condition (Figure 1).
Ensure that if the COM_ pin is connected to a low-
impedance load, the absolute maximum current rating
of 30mA is never exceeded, either in normal or fault
conditions.
The GND, COM_, and A_ pins do not have fault protec-
tion. Reverse ESD protection diodes are internally con-
nected between GND, COM_, A_, and both V+ and V-.
If a signal on GND, COM_, or A_ exceeds V+ or V- by
more than 300mV, one of these diodes will conduct.
During normal operation, these reverse-biased ESD
diodes leak a few nanoamps of current to V+ and V-
Fault Protection Voltage and Power Off
The maximum fault voltage on the NO_ pins is ±40V
from ground when the power is off. With ±15V supply
voltages, the highest voltage on NO_ can be V- + 40V,
and the lowest voltage on NO can be V+ - 40V.
Exceeding these limits can damage the chip.
Logic Level Thresholds
The logic level thresholds are CMOS and TTL compati-
ble with V+ = 13.5V to V+ = 16.5V.
Applications Information
Ground
There is no connection between the analog signal
paths and GND. The analog signal paths consist of an
N-channel and a P-channel MOSFET with their sources
and drains paralleled and their gates driven out of
phase to V+ and V- by the logic-level translators.
V+ and GND power the internal logic and logic level
translators and set the input logic thresholds. The logic-
level translators convert the logic levels to switched V+
and V- signals to drive the gates of the multiplexers.
This drive signal is the only connection between the
power supplies and the analog signals. GND, A_, and
COM_ have ESD protection diodes to V+ and V-.
Supply Current Reduction
When the logic signals are driven rail-to-rail from 0 to
+15V or -15V to +15V, the current consumption will be
reduced from 370µA (typ) to 200µA.
Power Supplies
The MAX4508/MAX4509 operate with bipolar supplies
between ±4.5V and ±20V. The V+ and V- supplies
need not be symmetrical, but their sum cannot exceed
the 44V absolute maximum rating.
The MAX4508/MAX4509 operate from single supplies
between +9V and +36V when V- is connected to GND.
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet MAX4508.PDF ] | |
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