MAXIM MAX3250_11

19-2443; Rev 3; 9/11
±50V Isolated, 3.0V to 5.5V,
250kbps, 2 Tx/2 Rx, RS-232 Transceiver
The MAX3250 is a 3.0V to 5.5V powered, ±50V isolated
EIA/TIA-232 and V.28/V.24 communications interface
with high data-rate capabilities. The MAX3250 is a dual
die part that operates with up to ±50V difference
between the RS-232 side and the logic side (ISOCOM
to GND). This makes the device ideal for operation in
noisy conditions with high common-mode voltages.
This feature prevents damage to the device if RS-232
lines are inadvertently short-circuited to a +24V or ±48V
power bus.
The MAX3250 is powered by a single 3V to 5.5V supply
on the logic side. Power is transferred from the logic
side to the isolated side by ±100V external capacitors.
The MAX3250 has two receivers (Rx) and two drivers
(Tx) and is guaranteed to run at data rates of 250kbps
while maintaining RS-232 output levels. The transceivers have a proprietary low-dropout transmitter output stage, delivering true RS-232 performance from a
3V to 5.5V supply with a dual charge pump. The device
features a FAULT open-drain output to signal an excessive isolated-side voltage condition on any of the RS232 inputs. This output can drive an alarm LED or can
be monitored by the processor to prevent operation
under these conditions. The receiver outputs are high
impedance in shutdown, allowing multiple interfaces
(IrDA, RS-232, RS-485) to be connected to the same
UART.
The MAX3250 is available in a space-saving 28-pin
SSOP package.
Applications
Features
o ±50V Isolation
o 20µA Supply Current in Shutdown
o 250kbps Guaranteed Data Rate
o FAULT Output
o High-Impedance Transmitter and Receiver
Outputs in Shutdown
o Space-Saving SSOP Package
o Inductorless/Transformerless Design Simplifies
EMI Compliance
o Low-Cost Replacement for Opto-Isolated
Transceivers
o Meets EIA/TIA-232 Specifications Down to 3.0V
Ordering Information
PART
TEMP RANGE
MAX3250CAI+
0°C to +70°C
PIN-PACKAGE
28 SSOP
MAX3250EAI+
-40°C to +85°C
28 SSOP
+Denotes a lead(Pb)-free/RoHS-compliant package.
Pin Configuration
TOP VIEW
+
C1- 1
28 VCC
Industrial Control
R1OUT 2
27 C2-
Programmable Logic Controller
R2OUT 3
26 GND
Point-of-Sale Equipment
T1IN 4
PC-to-Router Connections
T2IN 5
Diagnostic Ports
N.C. 6
Telecom Equipment
N.C. 7
22 N.C.
C1+ 8
21 C2+
C3+ 9
20 ISOVCC
Typical Operating Circuit appears at end of data sheet.
25 FAULT
24 SHDN
MAX3250
23 N.C.
V+ 10
19 R1IN
C3- 11
18 R2IN
C4+ 12
17 T1OUT
C4- 13
16 T2OUT
V- 14
15 ISOCOM
SSOP
________________________________________________________________ Maxim Integrated Products
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.
1
MAX3250
General Description
MAX3250
±50V Isolated, 3.0V to 5.5V,
250kbps, 2 TX/2 RX, RS-232 Transceiver
ABSOLUTE MAXIMUM RATINGS
C1+, C2+, C3+, C3-, C4+, C4(All voltages referenced to GND, unless otherwise noted.)
to ISOCOM .....................................-0.3V to (ISOVCC + 0.3V)
VCC ...........................................................................-0.3V to +6V
ISOCOM...............................................................................±80V
T_OUT Current ..............30mA (continuous), 50mA (peak, 10µs)
ISOVCC to ISOCOM.................................................-0.3V to +6V
R_IN Current..................30mA (continuous), 50mA (peak, 10µs)
V+ to ISOCOM (Note 1)............................................-0.3V to +7V
ISOCOM Current ...........30mA (continuous), 50mA (peak, 10µs)
V- to ISOCOM (Note 1)............................................+0.3V to -7V
Short-Circuit Duration T_OUT to ISOCOM .................Continuous
V+ + |V-| (Note 1) ...................................................................13V
Continuous Power Dissipation (TA = +70°C)
28-Pin SSOP (derate 15mW/°C above +70°C) .......1201.2mW
Input Voltages
Operating Temperature Ranges
T_IN, SHDN ...........................................................-0.3V to +6V
MAX3250CAI .....................................................0°C to +70°C
R_IN to ISOCOM...............................................................±25V
MAX3250EAI...................................................-40°C to +85°C
Output Voltages
Storage Temperature Range .............................-65°C to +150°C
T_OUT to ISOCOM ........................................................±13.2V
Lead Temperature (soldering, 10s) .................................+300°C
R_OUT .....................................................-0.3V to (VCC + 0.3V)
FAULT....................................................................-0.3V to +6V
Soldering Temperature (reflow) .......................................+260°C
C1-, C2- ......................................................-0.3V to (VCC + 0.3V)
Note 1: V+ and V- can have a maximum magnitude of 7V, but their absolute difference cannot exceed 13V.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VCC = 3.0V to 5.5V, see Typical Operating Circuit and Table 1 for capacitor values, ISOCOM = GND, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = 3.3V and TA = +25°C.) (Note 2)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
SHDN = VCC, no load
15
35
mA
SHDN = GND, VISOCOM = GND
20
DC CHARACTERISTICS
Supply Current
Supply Current Shutdown
SHDN = GND, VISOCOM = ±50V
Maximum Ground Differential
|VGND - VISOCOM|
Isolation Resistance
Between GND and ISOCOM
45
±350
50
60
µA
V
kΩ
LOGIC INPUTS
Input Logic Low
T_IN, SHDN
Input Logic High
T_IN, SHDN
0.8
VCC = 3.3V
2.0
VCC = 5.0V
2.4
Transmitter Input Hysteresis
V
V
0.5
V
T_IN, SHDN
-1
±0.01
+1
µA
Output Leakage Current
SHDN = GND
-10
±0.05
+10
µA
Output-Voltage Low
IOUT = 1.6mA
0.4
V
Output-Voltage High
IOUT = -1.0mA
FAULT OUTPUT
Output-Voltage Low
(Open Drain)
Output Leakage Current
IOUT = 5mA
FAULT Trip Level
|VGND - VISOCOM|
Input Leakage Current
RECEIVER OUTPUTS
2
VCC - 0.6 VCC - 0.1
FAULT not asserted
55
_______________________________________________________________________________________
V
0.4
V
1
µA
V
±50V Isolated, 3.0V to 5.5V,
250kbps, 2 TX/2 RX, RS-232 Transceiver
(VCC = 3.0V to 5.5V, see Typical Operating Circuit and Table 1 for capacitor values, ISOCOM = GND, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = 3.3V and TA = +25°C.) (Note 2)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
+25
V
RECEIVER INPUTS (relative to ISOCOM)
Input-Voltage Range
-25
Input Threshold Low
TA = +25°C
Input Threshold High
TA = +25°C
VCC = 3.3V
1.2
0.6
VCC = 5.0V
1.3
0.8
VCC = 3.3V
2.4
1.6
VCC = 5.0V
2.4
1.7
Input Hysteresis
V
0.5
Input Resistance
TA = +25°C
3
5
V
V
7
kΩ
TRANSMITTER OUTPUTS (relative to ISOCOM)
Output-Voltage Swing
All transmitter outputs loaded with 3kΩ to ISOCOM,
TA = +25°C
±5.0
±5.4
V
Output Resistance
ISOVCC = V+ = V- = 0V, VT_OUT = ±2V
300
10M
Ω
-60
+60
mA
VCC = 0 or 3V to 5.5V, VT_OUT = ±12V, SHDN = GND
-25
+25
µA
Output Short-Circuit Current
Output Leakage Current
TIMING CHARACTERISTICS
(VCC = 3.0V to 5.5V, see Typical Operating Circuit and Table 1 for capacitor values, ISOCOM = GND, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = 3.3V and TA = +25°C.)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Maximum Data Rate
RL = 3kΩ, CL = 1000pF to ISOCOM, one transmitter,
TA = +25°C
Receiver Propagation Delay
R_IN to R_OUT, CL = 150pF to GND
0.4
Receiver Skew
|tPHL - tPLH|
100
ns
Transmitter Skew
|tPHL - tPLH| (Note 3)
120
ns
Transition-Region Slew Rate
VCC = 3.3V, TA = +25°C,
RL = 3kΩ to 7kΩ to ISOCOM,
measured from +3V to -3V or
-3V to +3V
250
kbps
µs
CL = 150pF to 1000pF
to ISOCOM
6
30
CL = 150pF to 2500pF
to ISOCOM
4
30
V/µs
FAULT Propagation Delay
0.3
µs
Time to Shutdown
0.5
µs
Time to Exit Shutdown
VISOCOM = GND
300
VISOCOM = ±50V
350
µs
Note 2: All currents into the device are positive; all currents out of the device are negative. All voltages are referenced to device
ground, unless otherwise noted.
Note 3: Transmitter skew is measured at the transmitter zero crosspoints.
_______________________________________________________________________________________
3
MAX3250
ELECTRICAL CHARACTERISTICS (continued)
Typical Operating Characteristics
(VCC = 3.3V, 250kbps data rate, see Typical Operating Circuit and Table 1 for capacitor values, all transmitters loaded with 3kΩ and
CL to ISOCOM, TA = +25°C, unless otherwise noted.)
SLEW RATE
vs. LOAD CAPACITANCE
2
0
-2
20
-SLEW
15
+SLEW
10
T1 TRANSMITTING AT 250kbps
T2 TRANSMITTING AT 20kbps
80
SUPPLY CURRENT (mA)
T1 TRANSMITTING AT 250kbps
T2 TRANSMITTING AT 20kbps
90
MAX3250 toc02
VOUT+
25
SLEW RATE (V/µs)
6
4
30
MAX3250 toc01
8
OPERATING SUPPLY CURRENT
vs. LOAD CAPACITANCE
70
60
250kbps
50
40
120kbps
30
20
20kbps
5
VOUT-
10
FOR DATA RATES UP TO 250kbps
-6
0
0
1000
2000
3000
4000
5000
0
0
1000
LOAD CAPACITANCE (pF)
2000
3000
4000
5000
0
1000
LOAD CAPACITANCE (pF)
2000
3000
4000
LOAD CAPACITANCE (pF)
SHUTDOWN CURRENT
vs. TEMPERATURE
TIME TO EXIT SHUTDOWN
VISOCOM = 0V
MAX3250 toc04
400
SHDN
5V/div
ISOCOM = -50V
300
SUPPLY CURRENT (µA)
TOUT
5V/div
MAX3250 toc05
-4
MAX3250 toc03
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
TRANSMITTER OUTPUT VOLTAGE (V)
200
100
ISOCOM = 0V
0
-100
-200
ISOCOM = +50V
-300
100µs/div
-40
-15
10
35
60
85
TEMPERATURE (°C)
PEAK GROUND OFFSET VOLTAGE
vs. FREQUENCY
COMMON-MODE FAULT RESPONSE
MAX3250 toc07
MAX3250 toc06
60
VCC = 5V
50
PEAK GROUND OFFSET (±V)
MAX3250
±50V Isolated, 3.0V to 5.5V,
250kbps, 2 TX/2 RX, RS-232 Transceiver
ISOCOM
50V/div
40
30
VCC = 3.3V
20
FAULT
5V/div
10
0
0
100
200
300
400
500
600
4ms/div
FREQUENCY (Hz)
4
_______________________________________________________________________________________
5000
±50V Isolated, 3.0V to 5.5V,
250kbps, 2 TX/2 RX, RS-232 Transceiver
PIN
NAME
FUNCTION
Negative Terminal of the Power Isolation Capacitor. Connect a 100V capacitor from C1- to C1+.
See Table 1 for values.
1
C1-
2
R1OUT
3
R2OUT
TTL/CMOS Receiver Output
4
T1IN
TTL/CMOS Transmitter Input
TTL/CMOS Receiver Output
5
T2IN
TTL/CMOS Transmitter Input
6, 22, 23
N.C.
No Connection. Not internally connected.
7
N.C.
No Connection. Leave unconnected or connect to ISOCOM.
8
C1+
Positive Terminal of the Power Isolation Capacitor. Connect a 100V capacitor from C1+ to C1-.
See Table 1 for values.
9
C3+
Positive Terminal of the Voltage-Doubler Charge-Pump Capacitor. Connect a 0.1µF capacitor from
C3+ to C3-.
10
V+
+5.5V Generated by the Charge Pump, Referenced to ISOCOM. Bypass V+ to ISOCOM with a
0.47µF capacitor.
11
C3-
Negative Terminal of the Voltage-Doubler Charge-Pump Capacitor. Connect a 0.1µF capacitor from
C3- to C3+.
12
C4+
Positive Terminal of the Inverting Charge-Pump Capacitor. Connect a 0.47µF capacitor from
C4+ to C4-.
13
C4-
Negative Terminal of the Inverting Charge-Pump Capacitor. Connect a 0.47µF capacitor from
C4- to C4+.
14
V-
15
ISOCOM
16
T2OUT
RS-232 Transmitter Output
17
T1OUT
RS-232 Transmitter Output
18
R2IN
RS-232 Receiver Input
19
R1IN
RS-232 Receiver Input
20
ISOVCC
21
C2+
24
SHDN
Shutdown Control. Drive SHDN low to enter low-power shutdown mode. Drive SHDN high or connect
to VCC for normal operation.
25
FAULT
Overvoltage Indicator. Active low, open drain.
26
GND
Ground
27
C2-
Negative Terminal of the Power Isolation Capacitor. Connect a 100V capacitor from C2- to C2+.
See Table 1 for values.
28
VCC
3.0V to 5.5V Supply Voltage. Bypass VCC to GND with a 1µF capacitor.
-5.5V Generated by the Charge Pump, Referenced to ISOCOM. Bypass V- to ISOCOM with a 0.47µF
capacitor.
Isolated Ground
Internally Generated Isolated Power-Supply Voltage, Referenced to ISOCOM. Bypass ISOVCC to
ISOCOM with a 2.2µF capacitor.
Positive Terminal of the Power Isolation Capacitor. Connect a 100V capacitor from C2+ to C2-.
See Table 1 for values.
_______________________________________________________________________________________
5
MAX3250
Pin Description
MAX3250
±50V Isolated, 3.0V to 5.5V,
250kbps, 2 TX/2 RX, RS-232 Transceiver
TIN1
TOUT1
RIN1
ROUT1
TIN2
TOUT2
ROUT2
RIN2
SHDN
ISOVCC
FAULT
OSC
V+
MAX3250
RS-232
CHARGE
PUMP
VCC
POWER
CONTROLLER
FAULT
DETECTOR
GND
C1-
C2-
C1+ C2+
C3+
C3C4+
C4V-
ISOCOM
Figure 1. Functional Diagram
Detailed Description
The MAX3250 is a 3.0V to 5.5V powered, ±50V isolated
EIA/TIA-232 and V.28/V.24 communications interface
with high data-rate capabilities. The MAX3250 is a dual
die part that operates with up to ±50V difference
between the RS-232 side and the logic side (ISOCOM
to GND). This makes the device ideal for operation in
noisy conditions with high common-mode voltages.
This feature prevents damage to the device if RS-232
lines are inadvertently short-circuited to a +24V or ±48V
power bus.
The MAX3250 typically draws 15mA of supply current
when unloaded. Supply current drops to 20µA when
the device is placed in shutdown mode.
6
The MAX3250 has two receivers and two drivers and is
guaranteed to operate at data rates up to 250kbps. The
device features a FAULT open-drain output to signal an
excessive isolated-side voltage condition on any of the
RS-232 inputs. This output can drive an alarm LED or can
be monitored by the processor to prevent operation
under these conditions. The receiver outputs are high
impedance in shutdown, allowing multiple interfaces
(IrDA, RS-232, RS-485) to be connected to the same
UART (Figure 1). The MAX3250 is a low-cost replacement
for opto-isolated transceivers.
Isolated Power Supply
The MAX3250 drives a high-frequency square wave into
C1 and a complementary square wave into C2. These
_______________________________________________________________________________________
±50V Isolated, 3.0V to 5.5V,
250kbps, 2 TX/2 RX, RS-232 Transceiver
Dual Charge-Pump Voltage Converter
The RS-232 drivers are powered from a regulated dual
charge pump that provides output voltages of +5.5V (doubling charge pump) and -5.5V (inverting charge pump)
relative to ISOCOM over the 3.0V to 5.5V VCC range.
The charge pumps are powered from ISOVCC and
operate in a discontinuous mode. If the output voltages
are less than 5.5V, the charge pumps are enabled. If
the output voltages exceed 5.5V, the charge pumps
are disabled. Each charge pump requires a flying
capacitor (C3, C4) and a reservoir capacitor (C7, C8)
to generate the V+ and V- supplies.
RS-232 Transmitters
The transmitters are inverting level translators that convert
TTL/CMOS-logic levels to ±5.0V EIA/TIA-232-compliant
levels. They guarantee a 250kbps data rate with worstcase loads of 3kΩ in parallel with 1000pF to ISOCOM. In
shutdown, the transmitters are disabled and the outputs
are forced into a high-impedance state. When powered
off or shut down, the outputs can be driven up to ±12V
relative to ISOCOM. The transmitter inputs do not have
pullup resistors. All unused inputs should be connected
to VCC or GND.
RS-232 Receivers
The receivers convert RS-232 signals to CMOS-logic
output levels. The receivers’ outputs are forced into a
high-impedance state when the device is in shutdown.
This allows a single UART to multiplex between different protocols.
Low-Power Shutdown Mode
Shutdown mode is obtained by driving SHDN low. In
shutdown, the devices typically draw only 20µA of supply current and no power is transferred across the isolation capacitors. The charge pumps are disabled, and
the receiver outputs and transmitter outputs are high
impedance. When exiting shutdown the charge pumps
and transmitter outputs are fully operational in typically
500µs (Figure 3). Connect SHDN to VCC if the shutdown mode is not used.
Applications Information
Power Isolation Capacitors
The values for capacitors C1 and C2 are important for
proper operation of the device. These capacitors
should be 0.047µF for 4.5V to 5.5V operation, and
0.47µF for 3.0V to 3.6V operation. Smaller values result
in insufficient supply voltage on the isolated side.
Larger values are not allowed.
Capacitor C9 provides an AC feedback path for proper
controller operation. Connect C9 from ISOCOM to GND.
The values for C1, C2, and C9 determine the maximum
frequency and amplitude of the voltage difference
between the local and isolated ground. Table 1 shows
proper capacitance values.
TRANSMITTER OUTPUT VOLTAGE (V)
6
5
VCC = 3.0V
SHDN
5V/div
VOUT+
4
3
T1OUT
2
1
0
-1
VCC
T1
VOUT1+
T2
VOUT2-
2V/div
-2
-3
-4
-5
-6
VOUTVCC = 3.3V
0
1
2
3
4
5
6
7
8
T2OUT
100µs/div
LOAD CURRENT PER TRANSMITTER (mA)
Figure 2. Transmitter Output Voltage vs. Load Current per
Transmitter
Figure 3. Transmitter Outputs when Exiting Shutdown or
Powering Up
_______________________________________________________________________________________
7
MAX3250
AC waveforms are rectified on the isolated side of the
dual die to power its internal circuitry (ISOVCC).
Capacitor C6 filters the output of the rectifier. See the
Typical Operating Circuit.
The power controller works in a dual power mode. Power
is maximum when the isolated power supply is below its
regulation point. Power is reduced when the isolated
power supply is above its regulation point.
MAX3250
±50V Isolated, 3.0V to 5.5V,
250kbps, 2 TX/2 RX, RS-232 Transceiver
Table 1. Required Capacitor Values
C1, C2 (µF)
C3 (µF)
C4, C7, C8 (µF)
C5 (µF)
C6 (µF)
C9 (nF)
3.0 to 3.6
0.47
0.1
0.47
1
2.2
10
4.5 to 5.5
0.047
0.1
0.47
1
2.2
10
VCC (V)
To achieve full isolation capability, C1, C2, and C9
should be rated for 100V or higher operation and be X7R
or X5R type or metalized film dielectric. Y5V and Z5U
dielectrics should be avoided as their voltage and temperature coefficients make their power-transfer capabilities insufficient.
Charge-Pump and Bypass Capacitors
Capacitors C3–C8 should be X7R or X5R type dielectric. Their voltage rating needs to be 10V or higher.
Layout Information
Because the MAX3250 is intended for systems requiring ±50V isolation, some consideration in component
placement is necessary.
A 20mil air gap should isolate the logic side and the
isolated RS-232 side, across the N.C. pins (pin numbers 6, 7, 22, and 23) of the MAX3250. The only components that cross this air gap should be C1, C2, and
C9, which should all have a minimum 100V rating.
All capacitors should be located as close to the
MAX3250 as possible.
8
Maximum Voltage Between
ISOCOM and Logic GND
High values of applied isolation voltage and frequency
can cause ripple on ISOVCC, V+, V-, and in extreme
cases on VCC. Therefore, it is recommended that the
isolation-voltage and frequency be limited to the values
shown in the Typical Operating Characteristics.
Insert a 1kΩ 1/4W resistor in series with any isolation
test voltage when testing for maximum values of
applied isolation voltage. Exceeding the maximum limits of voltage and frequency (see the Typical Operating
Characteristics) could trigger a holding current in the
internal ESD-protection device if the ±80V isolation limit
is exceeded. This resistor should not be used in normal
application.
Transmitter Outputs when
Exiting Shutdown
Figure 3 shows two transmitter outputs when exiting
shutdown mode. As they become active, the two transmitter outputs are shown going to opposite RS-232 levels (one transmitter input is high, the other is low). Each
transmitter is loaded with 3kΩ in parallel with 2500pF.
The transmitter outputs display no ringing or undesirable transients as they come out of shutdown. Note that
the transmitters are enabled only when the magnitude
of V- exceeds approximately -3V.
_______________________________________________________________________________________
±50V Isolated, 3.0V to 5.5V,
250kbps, 2 TX/2 RX, RS-232 Transceiver
REMOTE
XCVR
VCC
C5
1µF
CABLE
VCC
REMOTE MICRO
RIN1
TOUT1
FAULT
RIN2
MICRO
SHDN
TIN1
ROUT1
TIN2
ROUT2
C1
0.47µF
C2
0.47µF
TOUT2
C4+
MAX3250
C4
0.47µF
C4C3+
C3
0.1µF
C3V+
C1+
C1C2+
VISOVCC
C6
2.2µF
C2GND
C8
0.47µF
C7
0.47µF
ISOCOM
C9
10nF
±50V
GND
OFFSET
Package Information
Chip Information
PROCESS: BiCMOS
REMOTE
GROUND
For the latest package outline information and land patterns
(footprints), go to www.maxim-ic.com/packages. Note that a
“+”, “#”, or “-” in the package code indicates RoHS status only.
Package drawings may show a different suffix character, but
the drawing pertains to the package regardless of RoHS status.
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE
NO.
LAND
PATTERN NO.
28 SSOP
A28M+3
21-0056
90-0095
_______________________________________________________________________________________
9
MAX3250
Typical Operating Circuit
MAX3250
±50V Isolated, 3.0V to 5.5V,
250kbps, 2 TX/2 RX, RS-232 Transceiver
Revision History
REVISION
NUMBER
REVISION
DATE
0
4/02
Initial release
—
1
2/03
Updated Design
—
2
1/08
Updated EC table
3
3
9/11
Added lead-free packaging information; corrected pin names, power
dissipation, and soldering temperature in Absolute Maximum Ratings; updated
capacitor values in data sheet.
DESCRIPTION
PAGES
CHANGED
1, 2, 3, 5–9
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in
the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
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