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19-1604; Rev 0; 1/00
15kV ESD-Protected, 1Mbps, 1A RS-232 Transmitters in SOT23-6
General Description
The MAX3188E/MAX3189E single RS-232 transmitters in a SOT23-6 package are for space- and cost-constrained applications requiring minimal RS-232 communications. These devices consume only 150A of supply current from 4.5V to 6V supplies. They feature a shutdown input that reduces current consumption to only 1A and forces the transmitter output into a high-impedance state. RS-232 data transmission is guaranteed up 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. o Small 6-Pin SOT23 Package o ESD-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 o 150A Operating Supply Current o Shutdown Reduces Supply Current to 1A o Guaranteed Data Rate 1Mbps (MAX3189E) 250kbps (MAX3188E) o Three-State RS-232 Transmitter Output o No External Components
Features
MAX3188E/MAX3189E
Applications
Diagnostic Ports Telecommunications Networking Equipment Set-Top Boxes Digital Cameras Hand-Held Equipment
PART MAX3188EEUT-T MAX3189EEUT-T
Ordering Information
TEMP. RANGE -40C to +85C -40C to +85C PINPACKAGE 6 SOT23-6 6 SOT23-6 TOP MARK AAHD AAHE
Typical Operating Circuit
TOP VIEW
1 +5.4V CBYPASS1 0.1F 6 SHDN VCC MAX3188E MAX3189E 3 TIN GND 2 CAPACITORS MAY BE POLARIZED OR UNPOLARIZED. TOUT 4 VEE 5 -5.4V CBYPASS2 0.1F SHDN 1
Pin Configuration
6
VCC
GND 2
MAX3188E MAX3189E
5
VEE
TIN 3
4
TOUT
SOT23-6
________________________________________________________________ Maxim Integrated Products
1
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15kV ESD-Protected, 1Mbps, 1A RS-232 Transmitters in SOT23-6 MAX3188E/MAX3189E
ABSOLUTE MAXIMUM RATINGS
VCC to GND (Note 1) ................................................-0.3V to +7V VEE to GND (Note 1).................................................+0.3V to -7V VCC to VEE (Note 1) .............................................................+13V TIN, SHDN to 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 = +70C) 6-Pin SOT23 (derate 8.7mW/C above +70C)..........691mW Operating Temperature Range ...........................-40C to +85C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C
Note 1: VCC and VEE can have maximum magnitudes 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 = +4.5V to +6V, VEE = -4.5V to -6V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5.4V, VEE = -5.4V, and TA = +25C.) (Note 2) PARAMETER DC CHARACTERISTICS Positive Supply Voltage Negative Supply Voltage Positive Supply Current Negative Supply Current Shutdown Supply Current INPUT LOGIC (TIN, SHDN) Input Logic Threshold Low Input Logic Threshold High Input Leakage TIN Input Hysteresis TRANSMITTER OUTPUTS Output Voltage Swing Output Resistance Output Short-Circuit Current Output Leakage Current TIMING CHARACTERISTICS Maximum Data Rate Transmitter Skew tTS RL = 3k, CL = 1000pF |tPHL - tPLH|, Figure 1 MAX3188E MAX3189E MAX3188E MAX3189E 6 0.25 1 100 25 30 V/s 24 2 150 s Mbps ns ITOUT VOUT = 12V; VCC = VEE = 0 or VCC = 5.4V, VEE = -5.4V; SHDN = 0 VTOUT RTOUT VCC = 4.5V, VEE = -4.5V, RL = 3k VCC = 5.4V, VEE = -5.4V, RL = 3k VCC = VEE = 0, VTOUT = 2V 3.7 5 300 35 60 25 V mA A VIL VIH 2.0 0.01 100 1 0.8 V V A mV VCC VEE ICC IEE V SHDN = 5V V SHDN = 5V V SHDN = 0 45 0.2 1 4.5 -6 6 -4.5 170 V V A A A SYMBOL CONDITIONS MIN TYP MAX UNITS
Transition-Region Slew Rate
RL = 3k to 7k, CL = 150pF to 1000pF, MAX3188E measured from -3V to +3V or +3V to -3V, VCC = 5.4V, VEE = MAX3189E -5.4V, TA = +25C tEN
Transmitter Enable Time 2
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15kV ESD-Protected, 1Mbps, 1A RS-232 Transmitters in SOT23-6
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +4.5V to +6V, VEE = -4.5V to -6V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5.4V, VEE = -5.4V, and TA = +25C.) (Note 2) PARAMETER ESD PROTECTION IEC 1000-4-2 Air-Gap Discharge TOUT IEC 1000-4-2 Contact Discharge Human Body Model Note 2: All devices are 100% tested at TA = +25C. All limits over temperature are guaranteed by design. 15 8 15 kV SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX3188E/MAX3189E
Typical Operating Characteristics
(VCC = +5.4V, VEE = -5.4V, RL = 3k, TA = +25C, unless otherwise noted.)
SUPPLY CURRENT vs. TRANSMITTER FREQUENCY (CL = 150pF)
MAX3188E/9E toc01
SUPPLY CURRENT vs. TRANSMITTER FREQUENCY (CL = 1000pF)
MAX3188E/9E toc02
MAX3188E SUPPLY CURRENT vs. OUTPUT CAPACITANCE
7 SUPPLY CURRENT (mA) 6 5 4 3 2 1 0 20kbps 120kbps
MAX3188E/9E toc03
3.0 ICC (MAX3189E) 2.5 SUPPLY CURRENT (mA) 2.0 1.5 1.0 IEE (MAX3188E) 0.5 0 IEE (MAX3189E) ICC (MAX3188E)
12 10 SUPPLY CURRENT (mA) 8 6 4 2 0
ICC = IEE
8 250kbps
MAX3189E MAX3188E
0 100 200 300 400 500 600 700 800 900 1000 TRANSMITTER FREQUENCY (kHz)
0 100 200 300 400 500 600 700 800 900 1000 TRANSMITTER FREQUENCY (kHz)
0
500
1000
1500
2000
2500
OUTPUT CAPACITANCE (pF)
MAX3189E SUPPLY CURRENT vs. OUTPUT CAPACITANCE
MAX3188E/9E toc04
MAX3188E SLEW RATE vs. OUTPUT CAPACITANCE
MAX3188E/9E toc05
MAX3189E SLEW RATE vs. OUTPUT CAPACITANCE
80 70 SLEW RATE (V/s) 60 50 40 30 20 +SLEW -SLEW
MAX3188E/9E toc06
14 12 SUPPLY CURRENT (mA) 10 8 6 4 2 0 0 500 1000 1500 2000 120kbps 20kbps 250kbps 1Mbps
14 12 SLEW RATE (V/s) 10 8 6 4 2 0 -SLEW
90
+SLEW
10 0 0 500 1000 1500 2000 2500 0 500 1000 1500 2000 2500 OUTPUT CAPACITANCE (pF) OUTPUT CAPACITANCE (pF)
2500
OUTPUT CAPACITANCE (pF)
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15kV ESD-Protected, 1Mbps, 1A RS-232 Transmitters in SOT23-6 MAX3188E/MAX3189E
Typical Operating Characteristics (continued)
(VCC = +5.4V, VEE = -5.4V, RL = 3k, TA = +25C, unless otherwise noted.)
MAX3188E TRANSMITTER OUTPUT SHUTDOWN WAVEFORM
MAX3188E/9E toc07
MAX3189E TRANSMITTER OUTPUT SHUTDOWN WAVEFORM
MAX3188E/9E toc08
CL = 150pF SHDN +2V 0 +5V SHDN
CL = 150pF +2V 0 +5V
TOUT
0
TOUT
0
-5V 1s/div
-5V
1s/div
Pin Description
PIN 1 2 3 4 5 6 NAME SHDN GND TIN TOUT VEE VCC FUNCTION Active-Low Shutdown. Pull low to reduce the supply current and to force TOUT into a high-impedance state. Ground TTL/CMOS Transmitter Input RS-232 Transmitter Output Negative Supply Voltage Positive Supply Voltage Figure 1. Transmitter Propagation-Delay Timing
TIN VIL VIH 50% 50% +5V TOUT -5V tPLH tPHL 50% 50%
Detailed Description
The 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 3k in 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.
Shutdown
The MAX3188E/MAX3189E feature a shutdown input. Drive SHDN low to reduce the supply current to 1A (max). Shutdown also forces TOUT into a high-impedance state, allowing the signal line to be safely controlled by other transmitters. Drive SHDN high for normal operation.
ESD Protection
As with all Maxim devices, ESD protection structures are incorporated on all pins to protect against ESD encountered during handling and assembly. The MAX3188E/ MAX3189Es' transmitter output has extra protection against static electricity. Maxim has developed state-ofthe-art structures enabling this pin to withstand ESD up
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15kV ESD-Protected, 1Mbps, 1A RS-232 Transmitters in SOT23-6
to 15kV without damage or latch-up. The MAX3188E/ MAX3189E's transmitter output is characterized for protection 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
HIGHVOLTAGE DC SOURCE
MAX3188E/MAX3189E
RC 1M CHARGE-CURRENT LIMIT RESISTOR
RD 1500 DISCHARGE RESISTANCE DEVICE UNDER TEST
Cs 100pF
STORAGE CAPACITOR
Human Body Model
Figure 2 shows the Human Body Model, and Figure 3 shows the current waveform it generates when discharged 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 1.5k resistor.
Figure 2. Human Body ESD Test Model
IEC 1000-4-2
The IEC 1000-4-2 standard covers ESD testing and performance of finished equipment; it does not specifically 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.
IP 100% 90% AMPERES 36.8% 10% 0 0 tRI TIME tDL CURRENT WAVEFORM Ir PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE)
Figure 3. Human Body Model Current Waveform
Power-Supply Decoupling
In most circumstances, 0.1F bypass capacitors are adequate for power-supply decoupling. Connect the bypass capacitors as close to the IC as possible.
HIGHVOLTAGE DC SOURCE
RC 50M TO 100M CHARGE-CURRENT LIMIT RESISTOR
RD 330 DISCHARGE RESISTANCE DEVICE UNDER TEST
Cs 150pF
STORAGE CAPACITOR
Figure 4. IEC 1000-4-2 ESD Test Model
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15kV ESD-Protected, 1Mbps, 1A RS-232 Transmitters in SOT23-6 MAX3188E/MAX3189E
Applications Information
I 100% 90% IPEAK
Power-Supply Sources
The 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 consumption, 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.
10% tR = 0.7ns TO 1ns 30ns 60ns t
Figure 5. IEC 1000-4-2 ESD Generator Current Waveform
+3V SUPPLY CBYPASS 0.1F C3 0.1F V+ VC4 0.1F VCC VEE MAX3188E MAX3189E SHDN
VCC C1+
C1 0.1F C1C2+ C2 0.1F C2-
TIN (TABLE 1)
TOUT
GND
GND
Figure 6. Powering the MAX3188E/MAX3189E
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15kV ESD-Protected, 1Mbps, 1A RS-232 Transmitters in SOT23-6 MAX3188E/MAX3189E
Table 1. RS-232 Devices with Internal Regulated Charge Pumps
PART MAX3221 MAX3221E MAX3222 MAX3222E MAX3223 MAX3223E MAX3224 MAX3224E MAX3225 MAX3225E MAX3226 MAX3226E MAX3227 MAX3227E MAX3232 MAX3232E MAX3237 MAX3238 MAX3241 MAX3241E MAX3243 MAX3243E MAX3244 MAX3244E MAX3245 MAX3245E NO. OF Tx/Rx 1/1 1/1 2/2 2/2 2/2 2/2 2/2 2/2 2/2 2/2 1/1 1/1 1/1 1/1 2/2 2/2 5/3 5/3 3/5 3/5 3/5 3/5 3/5 3/5 3/5 3/5 15kV ESD PROTECTION AutoShutdown PlusTM AutoShutdownTM DATA RATE (bps) 120k 250k 120k 250k 120k 250k 250k 250k 1M 1M 250k 250k 1M 1M 120k 250k 1M 250k 120k 250k 120k 250k 250k 250k 1M 1M
Chip Information
TRANSISTOR COUNT: 111
AutoShutdown and AutoShutdown Plus are trademarks of Maxim Integrated Products.
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15kV ESD-Protected, 1Mbps, 1A RS-232 Transmitters in SOT23-6 MAX3188E/MAX3189E
Package Information
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.
8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2000 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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