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Technical content
Features
Meets True EIA/TIA-232-F Standards from a +3.0V to +5.5V Power Supply Meets EIA/TIA-562 Levels of ±3.7V with Supply Voltages as Low as 2.7V Enhanced ESD Specifications: ±15kV Human Body Mode ±15kV IEC61000-4-2 Air Discharge Mode ±8kV IEC61000-4-2 Contact Discharge Mode 1μA Low Power Shutdown (UM3221E/UM3222E) 250kbps Minimum Transmission Rate Guaranteed 30V/μs Max Slew Rate Latch-Up Performance Exceeds 200mA Hot Swap and Fail-Safe I/O Logic Compatible with 1.8V Logic @ Vcc=3.3V
http://www.union-ic.com Rev.06 Dec.2013 2 / 1 5 UM3221E/UM3222E/UM3232E
Ordering Information
Part Number Temp. Range Package Type UM3221EEAE -40°C to +85°C SSOP16 UM3221EEUE -40°C to +85°C TSSOP16 UM3222EEUE -40°C to +85°C TSSOP20 UM3232EESE -40°C to +85°C SOP16 UM3232EEPE -40°C to +85°C DIP16 UM3232EEUE -40°C to +85°C TSSOP16 UM3232EEAE -40°C to +85°C SSOP16 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 +7.5 V V- Voltage on V - -7.5 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 SSOP16 775 mW TSSOP20 879 SOP16 696 DIP16 842 TSSOP16 754 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 those 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.
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Electrical Characteristics
(VCC=+3.0V to +5.5V, C1- C4=0.1 μF, TA=TMIN to T MAX, unless otherwise noted. Typical values are at TA=25℃) Parameter Symbol Conditions Min Typ Max Unit DC CHARACTERISTICS ( VCC=+3.3V or +5V, TA=25℃) VCC Supply Current I CC /SHDN= V CC, No load 0.3 1 mA Shutdown Supply Current ISHDN /SHDN= GND 1 μA LOGIC INPUTS Input Leakage Current T_IN, /SHDN, /EN ±1 μA Input Threshold Low V IL T_IN, /SHDN, /EN VCC = 3.3V 0.8 V VCC = 5.0V 0.8 Input Threshold High V IH T_IN, /SHDN, /EN VCC = 3.3V 1.6 V VCC = 5.0V 2.2 Transmitter Input Hysteresis VCC = 3.3V 0.2 V VCC = 5.0V 0.15 RECEIVER OUTPUTS Output Voltage Low V OL VCC = 3.3V, IOUT = 10mA 0.8 V VCC = 5.0V, IOUT = 10mA 0.8 RECEIVER INPUTS Input Voltage Range -30 30 V Input Threshold Low Input Threshold High TA = +25°C VCC = 3.3V 1.35 2 V VCC = 5.0V 1.75 2 Input Hysteresis 0.2 V Input Resistance TA = +25°C 3 5 7 k Ω TRANSMITTER OUTPUTS Output Voltage Swing All drivers loaded with 3k Ω to ground ±5.0 ±6.0 V Output Short-Circuit Current Short to VCC , GND or other TXD pin VCC = 3.3V ±30 ±60 mA VCC = 5.0V ±40 ±60 mA
http://www.union-ic.com Rev.06 Dec.2013 5 / 1 5 UM3221E/UM3222E/UM3232E Pin Configurations S S O P 1 6 / T S S O P 1 6 T SSOP20 SOP16/DIP16/TSSOP16/SSOP16 Pin Description Pin No. Pin Name Function UM3221E UM3222E UM3232E 1 1 - EN Receiver Enable. Active low. 2 2 1 C1+ Positive terminals of voltage-doubler charge pump capacitor 3 3 2 V+ Positive voltage generated by the charge pump 4 4 3 C1- Negative terminals of voltage-doubler charge pump capacitor 5 5 4 C2+ Positive terminals of inverting charge pump capacitor 6 6 5 C2- Negative terminals of inverting charge pump capacitor 7 7 6 V- Negative voltage generated by the charge pump 13 8, 17 7, 14 T_OUT RS-232 Driver Outputs 8 9, 16 8, 13 R_IN RS-232 Receiver Inputs 9 10, 15 9, 12 R_OUT RS-232 Receiver Outputs 11 12, 13 10, 11 T_IN RS-232 Driver Inputs 14 18 15 GND Ground 15 19 16 V CC +3.0V to +5.5V Supply Voltage Input 16 20 - SHDN Shut off pump power and transmitters. Active low.
http://www.union-ic.com Rev.06 Dec.2013 6 / 1 5 UM3221E/UM3222E/UM3232E Detailed Description Dual Charge-Pump Voltage Converter The UM3221E/UM3222E/UM3232Es’ internal power s upply consists of a regulated dual charge pump and provides output the maxim voltages of +7V (doubling charge pump) and -7V (inverting charge pump) over the +3.0V to +5.5V V CC range. The charge pump operates in discontinuous mode; if the output voltages are less than 7V, th e charge pump is enabled, and if the output voltages exceed 7V, the charge pump is disabled. The charge pumps require only four small, external 0.1μF capacitors for the voltage doubler and inverter functions (see Figure 2). RS-232 Transmitters The transmitters are inverting level translator s that translate TTL/CMOS inputs to EIA/TIA-232 output levels. All UM3221E/UM3222E/UM3232E tran smitters guarantee a 250 kbps data rate for full load conditions (3kΩ and 1000pF). Transmitters can be paralleled to drive multiple receivers. RS-232 Receivers The receivers convert RS-232 signals to CMOS ou tput levels and accept inputs up to ±30V while presenting the required 3k Ω to 7k Ω input impedance. The UM3221E/UM3222E receivers have inverting three-state outputs. Drive EN high to place the receivers into a high impedance state. Receivers can be either active or inactive in shutdown state depending on EN status. UM3221E/UM3222E Supply current falls to less than 1 μA in shutdown mode (SHDN = GND). When shutdown, the device’s charge pumps are shut off, V+ is pulled down to V CC, V- is pulled to ground, and the transmitter outputs are disabled (high impedance). The time required to recover from shutdown is typically 100μs. Connect SHDN to V CC if shutdown mode is not used. SHDN has no effect on R_OUT. ±15kV ESD Protection All pins on UM3221E/UM3222E/UM3232E devices include ESD protection structures, but the family incorporates advanced structures which allow the RS-232 pins (transmitter outputs and receiver inputs) to survive ESD events up to ±15kV . The RS-232 pins are particularly vulnerable to ESD damage because they are typically connected to an exposed port on the exterior of the finished product. The ESD structures withstand high ESD in all states: normal operation, shutdown and powered down. After an ESD event, circuits keep working without latch up. ESD protection can be tested in various ways; the transmitter outputs and receiver inputs are characterized for protection to the following limit s: ±15kV using the Human Body Model, ±8kV using the Contact Discharge method specified in IEC61000-4-2, ±15kV using the Air-Gap Discharge method specified in IEC61000-4-2. The logic pins are characterized for protection to the following limit: ±2kV using the Human Body Model. Hot Swap and Fail-Safe The UM3221E/UM3222E/UM3232E guarantees a logic-high receiver output when the receiver inputs are shorted to GND or open, or when they are connected to a line with no driver enabled. Because of the latch-up characteristics and all sort protection, UM3221E/UM3222E/UM3232E support hot swap.
http://www.union-ic.com Rev.06 Dec.2013 7 / 1 5 UM3221E/UM3222E/UM3232E Test Circuits Figure 1
http://www.union-ic.com Rev.06 Dec.2013 8 / 1 5 UM3221E/UM3222E/UM3232E Typical Operating Circuits Figure 2 +3.3V C5 C3 +3.3V C1+ C1- C2+ C2- 400k T1OUTT1IN R1INR1OUT VCC V+ +3.3V 400k T2OUTT2IN R2INR2OUT GND TTL/CMOS INPUTS TTL/CMOS OUTPUTS RS-232 OUTPUTS RS-232 INPUTS UM3222E
201 EN SHDN
+3.3V C5 C3 +3.3V C1+ C1- C2+ C2- 400k T1OUTT1IN R1INR1OUT VCC V+ GND 11 13 9 8 TTL/CMOS INPUT TTL/CMOS OUTPUT RS-232 INPUT UM3221E
161 EN SHDN
+3.3V C5 C3 +3.3V C1+ C1- C2+ C2- 400k T1OUTT1IN R1INR1OUT VCC V+ +3.3V 400k T2OUTT2IN R2INR2OUT GND TTL/CMOS INPUTS TTL/CMOS OUTPUTS RS-232 OUTPUTS RS-232 INPUTS UM3232E
http://www.union-ic.com Rev.06 Dec.2013 9 / 1 5 UM3221E/UM3222E/UM3232E Typical Operating Characteristics (VCC=+3.3V, 250kbps data rate, 0.1uF capacito rs, all transmitters loaded with 3k Ω and C L, TA=25℃, unless otherwise noted.) Transmitter Output Voltage vs. Supply Voltage 2 2.5 3 3.5 4 4.5 5 Supply Voltage(V) Transmitter Output Voltage(V) VOUT+ VOUT- V+,V- vs. Supply Voltage Supply Voltage (V) V+,V-(V) V+ Supply Current vs.Supply Voltage 2 2.5 3 3.5 4 4.5 5 5.5 6 Su pply Voltage(V) Supply Current(mA) Transmitting at 250kbps CL=1000pF Transmitter Output Voltage vs. Load Capacitance 0 500 1000 1500 2000 2500 3000 Load Capacitance (pF) Transmitter Output Voltage(V) VOUT+ VOUT- Supply Current vs. Load Capacitance 0 500 1000 1500 2000 2500 3000 Load Capacitance (pF) Supply Current (mA) Slew Rate vs. Load Capacitance 0 500 1000 1500 2000 2500 3000 Load Capacitance (pF) Slew Rate (V/us) +Slew -Slew Transmitting at 250kbps CL=1000pF Transmitting at 250kbps C L=1000pF Transmitting at 20kbps Transmitting at 20kbps Transmitting at 20kbps
http://www.union-ic.com Rev.06 Dec.2013 1 0 / 1 5 UM3221E/UM3222E/UM3232E Applications Information Capacitor Selection The capacitor type used for C1–C4 is not critical for proper operation; polarized or non-polarized capacitors can be used. The charge pump requires 0.1 μF capacitors for 3.3V operation. Increasing the capacitor values (e.g. by a factor of 2) re duces ripples on the transmitter outputs and slightly reduces power consumption. C2, C3 and C4 can be increased without changing C1’s value. When using the minimum required capacitor values, ma ke sure the capacitor value does not degrade excessively with temperature. If in doubt, use capacitors with a larger nominal value. The capacitor’s equivalent series resistance (ESR), which usually rises at low temperatures, influences the amount of ripples on V+ and V- output voltages. Power Supply Decoupling In most circumstances, a 0.1 μF V CC bypass capacitor is adequate. In applications sensitive to power-supply noise, use a capacitor of the same value as charge pump capacitor C1. Connect bypass capacitors to the IC as close as possible. Operation down to 2.7V Transmitter outputs meet EIA/TIA-562 levels of ±3.7V with supply voltages as low as 2.7V . Interconnection with 3V and 5V Logic The UM3221E/UM3222E/UM3232E can directly interface with various 3V and 5V logic families, including ACT and HCT CMOS.
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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.06 Dec.2013 1 2 / 1 5 UM3221E/UM3222E/UM3232E 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.06 Dec.2013 1 3 / 1 5 UM3221E/UM3222E/UM3232E TSSOP16/TSSOP20 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(16 PIN) 4.86 5.06 0.191 0.199 D(20 PIN) 6.40 6.60 0.256 0.264 E 6.20 6.60 0.248 0.264 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.06 Dec.2013 1 4 / 1 5 UM3221E/UM3222E/UM3232E SSOP16 Outline Drawing DIMENSIONS Symbol MILLIMETERS INCHES Min Max Min Max A - 2.00 - 0.079 A1 0.05 - 0.002 - A2 1.65 1.85 0.065 0.073 D 5.90 6.50 0.232 0.256 E 7.40 8.20 0.291 0.323 E1 5.00 5.60 0.197 0.220 b 0.22 0.38 0.009 0.015 e 0.65(BSC) 0.026(BSC)
http://www.union-ic.com Rev.06 Dec.2013 1 5 / 1 5 UM3221E/UM3222E/UM3232E 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