Soldering Temperature (reflow) .......................................+260°C
C1-, C2- ......................................................-0.3V to (V
CC
+ 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
(V
CC
= 3.0V to 5.5V, see Typical Operating Circuit and Table 1 for capacitor values, ISOCOM = GND, T
A
= T
MIN
to T
MAX
, unless oth-
erwise noted. Typical values are at V
CC
= 3.3V and T
A
= +25°C.) (Note 2)
PARAMETER
DC CHARACTERISTICS
Supply Current
Supply Current Shutdown
Maximum Ground Differential
Isolation Resistance
LOGIC INPUTS
Input Logic Low
Input Logic High
Transmitter Input Hysteresis
Input Leakage Current
RECEIVER OUTPUTS
Output Leakage Current
Output-Voltage Low
Output-Voltage High
FAULT OUTPUT
Output-Voltage Low
(Open Drain)
Output Leakage Current
FAULT
Trip Level
SHDN
= GND
I
OUT
= 1.6mA
I
OUT
= -1.0mA
V
CC
- 0.6 V
CC
- 0.1
-10
±0.05
+10
0.4
µA
V
V
T_IN,
SHDN
-1
T_IN,
SHDN
T_IN,
SHDN
V
CC
= 3.3V
V
CC
= 5.0V
2.0
2.4
0.5
±0.01
+1
0.8
V
V
V
µA
SHDN
= V
CC
, no load
SHDN
= GND, V
ISOCOM
= GND
SHDN
= GND, V
ISOCOM
=
±50V
|V
GND
- V
ISOCOM
|
Between GND and ISOCOM
60
15
20
35
45
±350
50
mA
µA
V
kΩ
CONDITIONS
MIN
TYP
MAX
UNITS
I
OUT
= 5mA
FAULT
not asserted
|V
GND
- V
ISOCOM
|
55
0.4
1
V
µA
V
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Maxim Integrated | 2
MAX3250
±50V Isolated, 3.0V to 5.5V, 250kbps,
2 Tx/2 Rx, RS-232 Transceiver
Electrical Characteristics (continued)
(V
CC
= 3.0V to 5.5V, see Typical Operating Circuit and Table 1 for capacitor values, ISOCOM = GND, T
A
= T
MIN
to T
MAX
, unless oth-
erwise noted. Typical values are at V
CC
= 3.3V and T
A
= +25°C.) (Note 2)
PARAMETER
RECEIVER INPUTS
(relative to ISOCOM)
Input-Voltage Range
Input Threshold Low
Input Threshold High
Input Hysteresis
Input Resistance
T
A
= +25°C
All transmitter outputs loaded with 3kΩ to ISOCOM,
T
A
= +25°C
ISOVCC = V+ = V- = 0V, V
T_OUT
=
±2V
V
CC
= 0 or 3V to 5.5V, V
T_OUT
=
±12V,
SHDN
= GND
3
TRANSMITTER OUTPUTS
(relative to ISOCOM)
Output-Voltage Swing
Output Resistance
Output Short-Circuit Current
Output Leakage Current
±5.0
300
-60
-25
±5.4
10M
+60
+25
V
Ω
mA
µA
T
A
= +25°C
T
A
= +25°C
V
CC
= 3.3V
V
CC
= 5.0V
V
CC
= 3.3V
V
CC
= 5.0V
2.4
2.4
-25
1.2
1.3
1.6
1.7
0.5
5
7
+25
0.6
0.8
V
V
V
V
kΩ
CONDITIONS
MIN
TYP
MAX
UNITS
Timing Characteristics
(V
CC
= 3.0V to 5.5V, see Typical Operating Circuit and Table 1 for capacitor values, ISOCOM = GND, T
A
= T
MIN
to T
MAX
, unless oth-
erwise noted. Typical values are at V
CC
= 3.3V and T
A
= +25°C.)
PARAMETER
Maximum Data Rate
Receiver Propagation Delay
Receiver Skew
Transmitter Skew
CONDITIONS
R
L
= 3kΩ, C
L
= 1000pF to ISOCOM, one transmitter,
T
A
= +25°C
R_IN to R_OUT, C
L
= 150pF to GND
|t
PHL
- t
PLH
|
|t
PHL
- t
PLH
|
(Note 3)
V
CC
= 3.3V, T
A
= +25°C,
R
L
= 3kΩ to 7kΩ to ISOCOM,
measured from +3V to -3V or
-3V to +3V
C
L
= 150pF to 1000pF
to ISOCOM
C
L
= 150pF to 2500pF
to ISOCOM
6
4
0.3
0.5
V
ISOCOM
= GND
V
ISOCOM
=
±50V
300
350
MIN
250
0.4
100
120
30
V/µs
30
µs
µs
µs
TYP
MAX
UNITS
kbps
µs
ns
ns
Transition-Region Slew Rate
FAULT
Propagation Delay
Time to Shutdown
Time to Exit Shutdown
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.
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Maxim Integrated | 3
MAX3250
±50V Isolated, 3.0V to 5.5V, 250kbps,
2 Tx/2 Rx, RS-232 Transceiver
Typical Operating Characteristics
(V
CC
= 3.3V, 250kbps data rate, see Typical Operating Circuit and Table 1 for capacitor values, all transmitters loaded with 3kΩ and
C
L
to ISOCOM, T
A
= +25°C, unless otherwise noted.)
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3250 toc01
SLEW RATE
vs. LOAD CAPACITANCE
MAX3250 toc02
OPERATING SUPPLY CURRENT
vs. LOAD CAPACITANCE
80
SUPPLY CURRENT (mA)
70
60
50
40
30
20
120kbps
20kbps
250kbps
T1 TRANSMITTING AT 250kbps
T2 TRANSMITTING AT 20kbps
MAX3250 toc03
8
TRANSMITTER OUTPUT VOLTAGE (V)
6
V
OUT+
4
2
0
-2
T1 TRANSMITTING AT 250kbps
T2 TRANSMITTING AT 20kbps
30
25
SLEW RATE (V/μs)
20
15
10
5
+SLEW
-SLEW
90
-4
-6
0
1000
V
OUT-
2000
3000
4000
5000
FOR DATA RATES UP TO 250kbps
0
0
1000
2000
3000
4000
5000
LOAD CAPACITANCE (pF)
10
0
0
1000
2000
3000
4000
5000
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
TIME TO EXIT SHUTDOWN
V
ISOCOM
= 0V
SHUTDOWN CURRENT
vs. TEMPERATURE
SHDN
5V/div
SUPPLY CURRENT (μA)
ISOCOM = -50V
MAX3250 toc05
MAX3250 toc04
400
300
200
100
0
-100
-200
-300
ISOCOM = +50V
TOUT
5V/div
ISOCOM = 0V
100μs/div
-40
-15
10
35
60
85
TEMPERATURE (°C)
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
TRANSMITTER OUTPUT VOLTAGE (V)
MAX3250 toc01
COMMON-MODE FAULT RESPONSE
MAX3250 toc07
8
6
V
OUT+
4
2
0
-2
-4
-6
0
1000
2000
3000
4000
V
OUT-
T1 TRANSMITTING AT 250kbps
T2 TRANSMITTING AT 20kbps
ISOCOM
50V/div
FAULT
5V/div
5000
4ms/div
LOAD CAPACITANCE (pF)
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Maxim Integrated | 4
MAX3250
±50V Isolated, 3.0V to 5.5V, 250kbps,
2 Tx/2 Rx, RS-232 Transceiver
Pin Description
PIN
1
2
3
4
5
6, 22, 23
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
24
25
26
27
28
NAME
C1-
R1OUT
R2OUT
T1IN
T2IN
N.C.
N.C.
C1+
C3+
V+
C3-
C4+
C4-
V-
ISOCOM
T2OUT
T1OUT
R2IN
R1IN
ISOVCC
C2+
SHDN
FAULT
GND
C2-
V
CC
FUNCTION
Negative Terminal of the Power Isolation Capacitor. Connect a 100V capacitor from C1- to C1+.
See Table 1 for values.
TTL/CMOS Receiver Output
TTL/CMOS Receiver Output
TTL/CMOS Transmitter Input
TTL/CMOS Transmitter Input
No Connection. Not internally connected.
No Connection. Leave unconnected or connect to ISOCOM.
Positive Terminal of the Power Isolation Capacitor. Connect a 100V capacitor from C1+ to C1-.
See Table 1 for values.
Positive Terminal of the Voltage-Doubler Charge-Pump Capacitor. Connect a 0.1µF capacitor from
C3+ to C3-.
+5.5V Generated by the Charge Pump, Referenced to ISOCOM. Bypass V+ to ISOCOM with a
0.47µF capacitor.
Negative Terminal of the Voltage-Doubler Charge-Pump Capacitor. Connect a 0.1µF capacitor from
C3- to C3+.
Positive Terminal of the Inverting Charge-Pump Capacitor. Connect a 0.47µF capacitor from
C4+ to C4-.
Negative Terminal of the Inverting Charge-Pump Capacitor. Connect a 0.47µF capacitor from
C4- to C4+.
-5.5V Generated by the Charge Pump, Referenced to ISOCOM. Bypass V- to ISOCOM with a 0.47µF
capacitor.
Isolated Ground
RS-232 Transmitter Output
RS-232 Transmitter Output
RS-232 Receiver Input
RS-232 Receiver Input
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.
Shutdown Control. Drive
SHDN
low to enter low-power shutdown mode. Drive
SHDN
high or connect
to V
CC
for normal operation.
Overvoltage Indicator. Active low, open drain.
Ground
Negative Terminal of the Power Isolation Capacitor. Connect a 100V capacitor from C2- to C2+.
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