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19-1628; Rev 0; 2/00
1Mbps, 1A RS-232 Transmitters in SOT23-6
General Description
The MAX3188/MAX3189 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. RS-232 data transmission is guaranteed up to 250kbps with the MAX3188 and up to 1Mbps with the MAX3189. The MAX3188/MAX3189 transmitters are inverting level translators that convert CMOS-logic levels to 5V EIA/TIA-232 levels. They feature a shutdown input that reduces current consumption to only 1A and forces the transmitter output into a high-impedance state. The MAX3188/MAX3189 transmitters have a standard inverting output. o Small 6-Pin SOT23 Package o 150A Supply Current o Shutdown Reduces Supply Current to 1A o Guaranteed Data Rate 1Mbps (MAX3189) 250kbps (MAX3188) o Three-State RS-232 Transmitter Output o No External Components Required
Features
MAX3188/MAX3189
Applications
Diagnostic Ports Telecommunications Networking Equipment Set-Top Boxes Digital Cameras Hand-Held Equipment
PART MAX3188EUT-T MAX3189EUT-T
Ordering Information
TEMP. RANGE -40C to +85C -40C to +85C PIN-PACKAGE 6 SOT23-6 6 SOT23-6 TOP MARK AAHJ AAHK
Typical Operating Circuit
TOP VIEW
SHDN VCC MAX3188 MAX3189 3 TIN GND 2 CAPACITORS MAY BE POLARIZED OR UNPOLARIZED. TOUT 4 VEE 5 -5.4V CBYPASS2 0.1F GND 2 SHDN 1
Pin Configuration
1 +5.4V CBYPASS1 0.1F 6
6
VCC
MAX3188 MAX3189
5
VEE
TIN 3
4
TOUT
SOT23-6
________________________________________________________________ Maxim Integrated Products
1
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1Mbps, 1A RS-232 Transmitters in SOT23-6 MAX3188/MAX3189
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 +160C 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 MAX3188EUT MAX3189EUT MAX3188EUT MAX3189EUT 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 4.5 -6 110 34 0.2 1 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, MAX3188EUT measured from -3V to +3V or +3V to -3V, VCC = 5.4V, VEE = MAX3189EUT -5.4V, TA = +25C tEN
Transmitter Enable Time 2
Note 2: All devices are 100% tested at TA = +25C. All limits over temperature are guaranteed by design. _______________________________________________________________________________________
1Mbps, 1A RS-232 Transmitters in SOT23-6
Typical Operating Characteristics
(VCC = +5.4V, VEE = -5.4V, RL = 3k, TA = +25C, unless otherwise noted.)
SUPPLY CURRENT vs. DATA RATE (CL = 150pF)
MAX3188/9 toc01
MAX3188/MAX3189
SUPPLY CURRENT vs. DATA RATE (CL = 1000pF)
MAX3188/9 toc02
MAX3188 SUPPLY CURRENT vs. OUTPUT CAPACITANCE
3.5 SUPPLY CURRENT (mA) 3.0 2.5 2.0 1.5 1.0 0.5 0 40kbps 120kbps 250kbps
MAX3188/9 toc03
2.5 ICC (MAX3189)
7 6 SUPPLY CURRENT (mA) 5 4 3 2 MAX3188 1 MAX3189
4.0
2.0 SUPPLY CURRENT (mA) ICC (MAX3188)
1.5
IEE (MAX3189) 1.0 IEE (MAX3188) 0.5
0 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 DATA RATE (Mbps)
0 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 DATA RATE (Mbps)
0
500
1000
1500
2000
2500
OUTPUT CAPACITANCE (pF)
MAX3189 SUPPLY CURRENT vs. OUTPUT CAPACITANCE
MAX3188/9 toc04
MAX3188 SLEW RATE vs. OUTPUT CAPACITANCE
MAX3188/9 toc05
MAX3189 SLEW RATE vs. OUTPUT CAPACITANCE
80 70 SLEW RATE (V/s) 60 50 40 30 20 +SLEW -SLEW
MAX3188/9 toc06
14 12 SUPPLY CURRENT (mA) 1Mbps 10 8 6 240kbps 4 2 0 0 500 1000 1500 2000 40kbps 500kbps
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)
MAX3188 TRANSMITTER OUTPUT SHUTDOWN WAVEFORM
MAX3188/9 toc07
MAX3189 TRANSMITTER OUTPUT SHUTDOWN WAVEFORM
MAX3188/9 toc08
CL = 150pF SHDN
+2V 0 +5V SHDN
CL = 150pF +2V 0 +5V
TOUT
0
TOUT
0
-5V
-5V
1s/div
1s/div
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1Mbps, 1A RS-232 Transmitters in SOT23-6 MAX3188/MAX3189
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
Detailed Description
The transmitter is an inverting level translator that converts CMOS-logic levels to 5V EIA/TIA-232 levels. The MAX3188 guarantees a 250kbps data rate, and the MAX3189 guarantees a 1Mbps data rate with worst-case loads of 3k in parallel with 1000pF. The transmitter input does not have a pull-up resistor and should be connected to GND if unused.
+5V TOUT -5V tPLH tPHL VIH TIN VIL 50% 50% 50% 50%
Shutdown
The MAX3188/MAX3189 feature a shutdown input. Drive SHDN low to reduce the supply current to 1A (max). Shutdown also forces TOUT into a highimpedance state that allows the signal line to be safely controlled by other transmitters. Drive SHDN high for normal operation.
Figure 1. Transmitter Propagation-Delay Timing
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.
Applications Information
Power-Supply Sources
The MAX3188/MAX3189 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 devices' 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 MAX3188/ MAX3189 may be powered from the internal charge pump (Figure 2). This eliminates the need for additional external DC-DC converters to generate the required 4.5V to 6V dual supplies.
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1Mbps, 1A RS-232 Transmitters in SOT23-6 MAX3188/MAX3189
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
AutoShutdown and AutoShutdown Plus are trademarks of Maxim Integrated Products.
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1Mbps, 1A RS-232 Transmitters in SOT23-6 MAX3188/MAX3189
+3V SUPPLY CBYPASS 0.1F C3 0.1F V+ VC4 0.1F VCC VEE MAX3188 MAX3189 SHDN
VCC C1+
C1 0.1F C1C2+ C2 0.1F C2-
TIN (TABLE 1)
TOUT
GND
GND
Figure 2. Powering the MAX3188/MAX3189
Chip Information
TRANSISTOR COUNT: 111
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1Mbps, 1A RS-232 Transmitters in SOT23-6
Package Information
6LSOT.EPS
MAX3188/MAX3189
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1Mbps, 1A RS-232 Transmitters in SOT23-6 MAX3188/MAX3189
NOTES
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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