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Technical content
Features
ESD Protection for RS-232 Bus Pins up to ±15kV Human Body Model Single +5V power supply Low power, ICC 15mA maximum Operates up to 250Kbps Receiver Noise Filter Latch-Up Performance Exceeds 200mA
Ordering Information
Part Number Temp. Range Package Type UM232EESE -40°C to +85°C SOP16 UM232EEPE -40°C to +85°C DIP16 UM232EEUE -40°C to +85°C TSSOP16
http://www.union-ic.com Rev.04 Jan.2013 2 / 1 1 UM232EExE Absolute Maximum Ratings (Note 1) Symbol Parameter Value Unit VCC Supply Voltage on VCC -0.3 to +6 V V+ Voltage on V + (V CC - 0.3) to +14 V V- Voltage on V - -14 to +0.3 V T_IN Voltage on T_IN -0.3 to (V CC + 0.3) V R_IN Voltage on R_IN ±30 V T_OUT Voltage on T_OUT (V - - 0.3) to (V+ + 0.3) V R_OUT Voltage on R_OUT -0.3 to (V CC + 0.3) V Short-Circuit Duration, T_OUT Continuous PD Continuous Power Dissipation at TA = 70°C SOP16 696 DIP16 842 mW TSSOP16 754.7 TA Operating Temperature Range -40 to +85 °C TSTG Storage Temperature Range -65 to +165 °C TL Maximum Lead Temperature for Soldering 10 seconds +300 °C Note 1: Stresses beyond those listed under “A bsolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings onl y, and functional operation of the device at these or any other conditions beyond tho se indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum ra ting conditions for extende d periods may affect device reliability.
http://www.union-ic.com Rev.04 Jan.2013 4 / 1 1 UM232EExE Pin Configurations SOP16/DIP16/TSSOP16 Pin Descriptions Pin No. Pin Name Function SOP/DIP/TSSOP 1,3 C1 +, C1- Terminals for positive charge pump capacitor
2 V + +2V CC voltage generated by the charge pump
4,5 C2 +, C2- Terminals for negative charge pump capacitor
6 V- -2V CC voltage generated by the charge pump
7,14 T_OUT RS-232 Driver Outputs 8,13 R_IN RS-232 Receiver Inputs 9,12 R_OUT RS-232 Receiver Outputs 10,11 T_IN RS-232 Driver Inputs
15 GND Ground
16 V CC +4.5V to +5.5V Supply Voltage Input Detailed Description The UM232EExE consists of three sections: char ge-pump voltage converters, drivers, and receivers. These E versions provide extra protec tion against ESD. They survive ±15kV discharges to the RS-232 inputs and outputs, tested using th e Human Body Model. When tested according to IEC61000-4-2, they survive ±8kV contact-discharges and ±15kV air-gap discharges. The rugged E versions are intended for use in harsh envi ronments or applications where the RS-232 connection is frequently changed. The UM232EExE devices have internal charge pump voltage converters which allow them to operate from a si ngle +5V supply. The charge pumps will operate with polarized or non-polarized capacitors ranging from 0.1 to 10 μF and will generate the ±9V needed to generate the RS-232 output levels. RS-232 Drivers The drivers are inverting transmitters, which accept TTL or CMOS inputs and output RS-232 signals with an inverted sense relative to the input logic levels. Typically the RS-232 output voltage swing is ±9V. Even under worst case loading conditions of 3k Ω and 2500pF, the output is
http://www.union-ic.com Rev.04 Jan.2013 5 / 1 1 UM232EExE guaranteed to be ±5V, which is consistent with the RS-232 standard specifications. The transmitter outputs are protected against infinite sh ort-circuits to ground without degradation in reliability. The instantaneous slew rate of th e transmitter output is internally limited to a maximum of 30V/ μs in order to meet the RS-232 standard . The smooth transition of the loaded output from VOL to VOH clearly meets the monotonicity requirements of the RS-232 standard. RS-232 Receivers The receivers convert RS-232 input signals to inverted TTL signals. The input thresholds are 0.8V minimum and 2.4V maximum, again well within the 3V RS-232 requirements. The receiver inputs are also protected against voltage up to 30V. A 5k Ω pull down resistor to ground will commit the output of the receiver to a high stat e when the pin is float. In actual system applications, it is quite possible for signals to be applied to the receiver inputs before power is applied the receiver circuitry. This occurs, for exampl e, when a PC user attemp ts to print, only to realize the printer wasn’t turned on. In this case an RS-232 signal from the PC will appear on the receiver input at the printer. When the printe r power is turned on, the receiver will operate normally. All of these enhanced devices are fully protected. ESD Protection UM232EExE devices have standard ESD protection stru ctures incorporated on the pins to protect against electrostatic discharges encountered during assembly and handling. In addition, the RS232 bus pins (driver outputs and receiver input) of these devices have an extra level of ESD protection. Advanced ESD structures were designed to successf ully protect these pins against ESD discharge of ±15kV Human Body Model when powered down or up.
http://www.union-ic.com Rev.04 Jan.2013 6 / 1 1 UM232EExE Test Circuits Figure 1
http://www.union-ic.com Rev.04 Jan.2013 7 / 1 1 UM232EExE Typical Operating Circuits Figure 2 Applications Information Capacitor Selection The capacitor type used for C1–C4 is not critical for proper operation. The UM232EExE, require 0.1μF capacitors, although in all cases capacitors up to 10 μF can be used without harm. Ceramic dielectrics are suggested for the 0.1 μF capacitors. When using the minimum recommended capacitor values, make sure the capacitance va lue does not degrade excessively as the operating temperature varies. If in doubt, use capacitors w ith a larger (e.g., 2x) nominal value. The capacitors’ effective series resistance (ESR), whic h usually rises at low temperatures, influences the amount of ripple on V + and V-. Use larger capacitors (up to 10 μF) to reduce the output impedance at V + and V-. Bypass V CC to ground with at least 0.1 μF capacitor. In applications sensitive to power-supply noise generate d by the charge pumps, decouple V CC to ground with a capacitor the same size as (or larger than) the charge pump capacitors (C1–C4). V+ and V- as Power Supplies A small amount of power can be drawn from V + and V-, although this will reduce both driver output swing and noise margins. Increasing the value of the charge-pump capacitors (up to 10 μF) helps maintain performance when power is drawn from V+ or V-. Driving Multiple Receivers Each transmitter is designed to drive a single r eceiver. Transmitters can be paralleled to drive multiple receivers. High Data Rates These transceivers maintain the RS-232 ±5.0V minimum driver output voltages at data rates of over 250 kbps.
http://www.union-ic.com Rev.04 Jan.2013 8 / 1 1 UM232EExE
Package Information
D b e L DIMENSIONS Symbol MILLIMETERS INCHES Min Max Min Max A 1.35 1.75 0.053 0.069 A1 0.10 0.25 0.004 0.010 b 0.35 0.49 0.014 0.019 C 0.19 0.25 0.007 0.010 E 3.80 4.00 0.150 0.157 D (8 PIN) 4.80 5.00 0.189 0.197 D (14 PIN) 8.55 8.75 0.337 0.344 D (16 PIN) 9.80 10.00 0.386 0.394 e 1.27 0.050 H 5.80 6.20 0.228 0.244 L 0.40 1.27 0.016 0.050
http://www.union-ic.com Rev.04 Jan.2013 9 / 1 1 UM232EExE UM232EEPE DIP16 Outline Drawing AL DIMENSIONS Symbol MILLIMETERS INCHES Min Max Min Max A - 5.08 - 0.200 A1 0.38 - 0.015 - A2 3.18 4.45 0.125 0.175 A3 1.40 2.03 0.055 0.080 b 0.41 0.56 0.016 0.022 b1 1.14 1.65 0.045 0.065 C 0.20 0.30 0.008 0.012 D (8 PIN) 8.84 9.91 0.348 0.390 D (14 PIN) 18.67 19.43 0.735 0.765 D (16 PIN) 18.92 19.43 0.745 0765 D1 0.13 2.03 0.005 0.080 E 7.62 8.26 0.300 0.325 E1 6.10 7.87 0.240 0.310 e 2.54 - 0.100 - eA 7.62 - 0.300 - eB - 10.16 - 0.400 L 2.92 3.81 0.115 0.150
http://www.union-ic.com Rev.04 Jan.2013 1 0 / 1 1 UM232EExE UM232EEUE TSSOP16 Outline Drawing DIMENSIONS Symbol MILLIMETERS INCHES Min Max Min Max A - 1.20 - 0.047 A1 0.05 0.15 0.002 0.006 A2 0.90 1.05 0.035 0.041 A3 0.34 0.54 0.013 0.021 D 4.86 5.06 0.191 0.199 E 6.20 6.60 0.244 0.260 E1 4.30 4.50 0.169 0.177 b 0.20 0.28 0.008 0.011 e 0.65BSC 0.026BSC
http://www.union-ic.com Rev.04 Jan.2013 1 1 / 1 1 UM232EExE IMPORTANT NOTICE The information in this document has been ca refully reviewed and is believed to be accurate. Nonetheless, this document is subjec t to change without notice. Union assumes no responsibility for any inaccuracies that may be contained in this document, and makes no commitment to update or to keep current the contained information, or to notify a person or organization of any update. Union rese rves the right to make changes, at any time, in order to improve reliability, function or design and to attempt to supply the best product possible. Union Semiconductor, Inc Add: 2F, No. 3, Lane 647 Songtao Road, Shanghai 201203 Tel: 021-51093966 Fax: 021-51026018 Website: www.union-ic.com