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MAX3250CAI+T

P1-P3P4-P6P7-P9P10-P10
General 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 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 trans-
ceivers have a proprietary low-dropout transmitter out-
put 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 exces-
sive 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.
The MAX3250 is available in a space-saving 28-pin
SSOP package.
Applications
Industrial Control
Programmable Logic Controller
Point-of-Sale Equipment
PC-to-Router Connections
Diagnostic Ports
Telecom Equipment
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
MAX3250
±50V Isolated, 3.0V to 5.5V,
250kbps, 2 Tx/2 Rx, RS-232 Transceiver
________________________________________________________________
Maxim Integrated Products
1
Ordering Information
19-2443; Rev 3; 9/11
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.
Typical Operating Circuit appears at end of data sheet.
PART TEMP RANGE PIN-PACKAGE
MAX3250CAI+ 0°C to +70°C 28 SSOP
MAX3250EAI+ -40°C to +85°C 28 SSOP
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
V
CC
C2-
GND
FAULT
SHDN
N.C.
ISOCOM
N.C.
C2+
ISOVCC
R1IN
R2IN
T1OUT
T2OUT
V-
C4-
C4+
C3-
V+
C3+
C1+
N.C.
N.C.
T2IN
T1IN
R2OUT
R1OUT
C1-
SSOP
TOP VIEW
MAX3250
+
Pin Configuration
+
Denotes a lead(Pb)-free/RoHS-compliant package.
MAX3250
±50V Isolated, 3.0V to 5.5V,
250kbps, 2 TX/2 RX, RS-232 Transceiver
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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.
(All voltages referenced to GND, unless otherwise noted.)
V
CC
...........................................................................-0.3V to +6V
ISOCOM...............................................................................±80V
ISOVCC to ISOCOM.................................................-0.3V to +6V
V+ to ISOCOM (Note 1)............................................-0.3V to +7V
V- to ISOCOM (Note 1)............................................+0.3V to -7V
V+ + |V-| (Note 1) ...................................................................13V
Input Voltages
T_IN, SHDN ...........................................................-0.3V to +6V
R_IN to ISOCOM...............................................................±25V
Output Voltages
T_OUT to ISOCOM ........................................................±13.2V
R_OUT.....................................................-0.3V to (V
CC
+ 0.3V)
FAULT....................................................................-0.3V to +6V
C1-, C2-......................................................-0.3V to (V
CC
+ 0.3V)
C1+, C2+, C3+, C3-, C4+, C4-
to ISOCOM .....................................-0.3V to (ISOVCC + 0.3V)
T_OUT Current ..............30mA (continuous), 50mA (peak, 10µs)
R_IN Current..................30mA (continuous), 50mA (peak, 10µs)
ISOCOM Current ...........30mA (continuous), 50mA (peak, 10µs)
Short-Circuit Duration T_OUT to ISOCOM .................Continuous
Continuous Power Dissipation (T
A
= +70°C)
28-Pin SSOP (derate 15mW/°C above +70°C) .......1201.2mW
Operating Temperature Ranges
MAX3250CAI .....................................................0°C to +70°C
MAX3250EAI...................................................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) .......................................+260°C
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 CONDITIONS MIN TYP MAX UNITS
DC CHARACTERISTICS
Supply Current SHDN = V
CC
, no load 15 35 mA
SHDN = GND, V
ISOCOM
= GND 20 45
Supply Current Shutdown
SHDN = GND, V
ISOCOM
= ±50V ±350
µA
Maximum Ground Differential |V
GND
- V
ISOCOM
| 50 V
Isolation Resistance Between GND and ISOCOM 60 kΩ
LOGIC INPUTS
Input Logic Low T_IN, SHDN 0.8 V
V
CC
= 3.3V 2.0
Input Logic High T_IN, SHDN
V
CC
= 5.0V 2.4
V
Transmitter Input Hysteresis 0.5 V
Input Leakage Current T_IN, SHDN -1 ±0.01 +1 µA
RECEIVER OUTPUTS
Output Leakage Current SHDN = GND -10 ±0.05 +10 µA
Output-Voltage Low I
OUT
= 1.6mA 0.4 V
Output-Voltage High I
OUT
= -1.0mA V
CC
- 0.6 V
CC
- 0.1 V
FAULT OUTPUT
Output-Voltage Low
(Open Drain)
I
OUT
= 5mA 0.4 V
Output Leakage Current FAULT not asserted 1 µA
FAULT Trip Level |V
GND
- V
ISOCOM
| 55 V
Note 1: V+ and V- can have a maximum magnitude of 7V, but their absolute difference cannot exceed 13V.
MAX3250
±50V Isolated, 3.0V to 5.5V,
250kbps, 2 TX/2 RX, RS-232 Transceiver
_______________________________________________________________________________________ 3
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 CONDITIONS
MIN TYP MAX
UNITS
RECEIVER INPUTS (relative to ISOCOM)
Input-Voltage Range -25
+25
V
V
CC
= 3.3V 1.2 0.6
Input Threshold Low T
A
= +25°C
V
CC
= 5.0V 1.3 0.8
V
V
CC
= 3.3V 2.4 1.6
Input Threshold High T
A
= +25°C
V
CC
= 5.0V 2.4 1.7
V
Input Hysteresis 0.5 V
Input Resistance T
A
= +25°C 3 5 7 kΩ
TRANSMITTER OUTPUTS (relative to ISOCOM)
Output-Voltage Swing
All transmitter outputs loaded with 3kΩ to ISOCOM,
T
A
= +25°C
±5.0 ±5.4
V
Output Resistance ISOVCC = V+ = V- = 0V, V
T_OUT
= ±2V
300 10M
Ω
Output Short-Circuit Current -60
+60
mA
Output Leakage Current V
CC
= 0 or 3V to 5.5V, V
T_OUT
= ±12V, SHDN = GND -25
+25
µA
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 CONDITIONS MIN TYP MAX UNITS
Maximum Data Rate
R
L
= 3kΩ, C
L
= 1000pF to ISOCOM, one transmitter,
T
A
= +25°C
250 kbps
Receiver Propagation Delay R_IN to R_OUT, C
L
= 150pF to GND 0.4 µs
Receiver Skew |t
PHL
- t
PLH
| 100 ns
Transmitter Skew |t
PHL
- t
PLH
| (Note 3) 120 ns
C
L
= 150pF to 1000pF
to ISOCOM
630
Transition-Region Slew Rate
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 2500pF
to ISOCOM
430
V/µs
FAULT Propagation Delay 0.3 µs
Time to Shutdown 0.5 µs
V
ISOCOM
= GND 300
Time to Exit Shutdown
V
ISOCOM
= ±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.
P1-P3P4-P6P7-P9P10-P10

MAX3250CAI+T

Mfr. #:
Buy MAX3250CAI+T
Manufacturer:
Maxim Integrated
Description:
RS-232 Interface IC 3-5.5V 250kbps Transceiver
Lifecycle:
New from this manufacturer.
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