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MAX3189EEUT-T
【15kV ESD-Protected, 1Mbps, 1レA RS-232 Transmitters in SOT23-6
General DescriptionThe MAX3188E/MAX3189E single RS-232 transmitters
in a SOT23-6 package are for space- and cost-con-
strained applications requiring minimal RS-232 commu-
nications. These devices consume only 150µA of
supply current from ±4.5V to ±6V supplies. They fea-
ture a shutdown input that reduces current consump-
tion to only 1µA and forces the transmitter output into a
high-impedance state. RS-232 data transmission is guar-
anteedup to 250kbps with the MAX3188E and up to
1Mbps with the MAX3189E.
The MAX3188E/MAX3189E are EIA/TIA-232 transmitters
that convert CMOS/TTL logic levels to RS-232-compliant
signals. The transmitter output is protected to ±15kV
using the IEC 1000-4-2 Air-Gap Discharge method, to
±8kV using the IEC 1000-4-2 Contact Discharge
method, and to ±15kV per the Human Body Model,
ensuring strict compliance with international standards.
The MAX3188E/MAX3189E transmitters have a standard
inverting output.
ApplicationsDiagnostic Ports
Telecommunications
Networking Equipment
Set-Top Boxes
Digital Cameras
Hand-Held Equipment
FeaturesSmall 6-Pin SOT23 PackageESD-Protected RS-232 Output
±15kV per Human Body Model
±8kV per IEC 1000-4-2, Contact Discharge
±15kV per IEC 1000-4-2, Air-Gap Discharge 150µA Operating Supply CurrentShutdown Reduces Supply Current to 1µAGuaranteed Data Rate
1Mbps (MAX3189E)
250kbps (MAX3188E)Three-State RS-232 Transmitter OutputNo External Components
MAX3188E/MAX3189E
±15kV ESD-Protected, 1Mbps, 1µA
RS-232 Transmitters in SOT23-6ypical Operating Circuit19-1604; Rev 0; 1/00
Pin Configuration
Ordering Information
MAX3188E/MAX3189E
±15kV ESD-Protected, 1Mbps, 1µA
RS-232 Transmitters in SOT23-6
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VCC = +4.5V to +6V, VEE= -4.5V to -6V, TA= TMINto TMAX, unless otherwise noted. Typical values are at VCC = +5.4V, VEE = -5.4V,
and TA= +25°C.) (Note 2)
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.
Note 1:VCCand VEEcan have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V.
VCCto GND (Note 1)................................................-0.3V to +7V
VEEto GND (Note 1).................................................+0.3V to -7V
VCCto VEE(Note 1).............................................................+13V
TIN, SHDNto GND...................................................-0.3V to +7V
TOUT to GND (SHDN= GND)..........................................±13.2V
TOUT to GND (SHDN= VCC)................................................±7V
Output Short-Circuit Duration.....................................Continuous
Continuous Power Dissipation (TA= +70°C)
6-Pin SOT23 (derate 8.7mW/°C above +70°C)..........691mW
Operating Temperature Range...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
MAX3188E/MAX3189E
±15kV ESD-Protected, 1Mbps, 1µA
RS-232 Transmitters in SOT23-6
Typical Operating Characteristics(VCC= +5.4V, VEE= -5.4V, RL= 3kΩ, TA= +25°C, unless otherwise noted.)
ELECTRICAL CHARACTERISTICS (continued)(VCC = +4.5V to +6V, VEE= -4.5V to -6V, TA= TMINto TMAX, unless otherwise noted. Typical values are at VCC = +5.4V, VEE = -5.4V,
and TA= +25°C.) (Note 2)
Note 2:All devices are 100% tested at TA= +25°C. All limits over temperature are guaranteed by design.
Detailed DescriptionThe MAX3188E/MAX3189E are EIA/TIA-232 transmitters
that convert CMOS/TTL logic levels to RS-232 signals.
They operate on ±4.5V to ±6V supplies and feature
enhanced electrostatic discharge protection (see ESD
Protection). The MAX3188E guarantees a 250kbps data
rate, and the MAX3189E guarantees a 1Mbps data rate
with worst-case loads of 3kΩin parallel with 1000pF.
The MAX3188E/MAX3189E invert the TOUT signal relative
to TIN (standard RS-232). The transmitter input does
not have a pull-up resistor and should be connected to
GND if unused.
ShutdownThe MAX3188E/MAX3189E feature a shutdown input.
Drive SHDNlow to reduce the supply current to 1µA
(max). Shutdown also forces TOUT into a high-imped-
ance state, allowing the signal line to be safely con-
trolled by other transmitters. Drive SHDNhigh for
normal operation.
ESD ProtectionAs with all Maxim devices, ESD protection structures are
incorporated on all pins to protect against ESD encoun-
tered during handling and assembly. The MAX3188E/
MAX3189Es’ transmitter output has extra protection
against static electricity. Maxim has developed state-of-
the-art structures enabling this pin to withstand ESD up
MAX3188E/MAX3189E
±15kV ESD-Protected, 1Mbps, 1µA
RS-232 Transmitters in SOT23-6
Pin Description
Typical Operating Characteristics (continued)(VCC= +5.4V, VEE= -5.4V, RL= 3kΩ, TA= +25°C, unless otherwise noted.)
to ±15kV without damage or latch-up. The MAX3188E/
MAX3189E’s transmitter output is characterized for pro-
tection to the following limits:±15kV using the Human Body Model±8kV using the Contact Discharge method specified
in IEC 1000-4-2±15kV using the Air-Gap Discharge method specified
in IEC 1000-4-2
Human Body ModelFigure 2 shows the Human Body Model, and Figure 3
shows the current waveform it generates when dis-
charged into a low impedance. This model consists of
a 100pF capacitor charged to the ESD voltage of interest,
and then discharged into the test device through a
1.5kΩresistor.
IEC 1000-4-2The IEC 1000-4-2 standard covers ESD testing and
performance of finished equipment; it does not specifi-
cally refer to ICs. The MAX3188E/MAX3189E enable
the design of equipment that meets the highest level
(Level 4) of IEC 1000-4-2 without the need for additional
ESD-protection components. The major difference
between tests done using the Human Body Model and
IEC 1000-4-2 is higher peak current in IEC 1000-4-2.
Because series resistance is lower in the IEC 1000-4-2
model, the ESD withstand voltage measured to this
standard is generally lower than that measured using
the Human Body. Figure 4 shows the IEC 1000-4-2
model, and Figure 5 shows the current waveform for
the ±8kV IEC 1000-4-2 Level 4 ESD Contact Discharge
test. The Air-Gap test involves approaching the device
with a charged probe. The Contact Discharge method
connects the probe to the device before the probe is
energized.
Power-Supply DecouplingIn most circumstances, 0.1µF bypass capacitors are
adequate for power-supply decoupling. Connect the
bypass capacitors as close to the IC as possible.
MAX3188E/MAX3189E
±15kV ESD-Protected, 1Mbps, 1µA
RS-232 Transmitters in SOT23-6
MAX3188E/MAX3189E
Applications Information
Power-Supply SourcesThe MAX3188E/MAX3189E require ±4.5V to ±6V dual
supplies. For applications where these supply voltages
are not present, a DC-DC converter must be added.
Due to the MAX3188E/MAX3189Es’ low current con-
sumption, a charge pump can provide the proper supply
voltages and requires a minimal amount of board
space and cost.
When using another RS-232 device containing an internal
regulated charge pump (Table 1), the MAX3188E/
MAX3189E may be powered from the internal charge
pump (Figure 6). This eliminates the need for additional
external DC-DC converters to generate the required
±4.5V to ±6V dual supplies.
±15kV ESD-Protected, 1Mbps, 1µA
RS-232 Transmitters in SOT23-6
