SP208EEA

® SP207E–SP213E +5V High Performance RS232 Transceivers s s s s s s s s s s Single +5V Supply Operation 0.1µF External Charge Pump Capacitors Typical 230kbps Transmission Rates Standard SOIC and SSOP Packages Lower Supply Current Than Competition (typical 3mA) 1µA Shutdown Mode WakeUp Feature in Shutdown Mode Tri–State Receiver Outputs Meets All EIA-232 and ITU V.28 Specifications Improved ESD Specifications: +15kV Human Body Model +15kV IEC1000-4-2 Air Discharge +8kV IEC1000-4-2 Contact Discharge DESCRIPTION The SP200E Series are enhanced multi–channel RS-232 line transceivers with improved electrical performance. The SP200E family is pin-to-pin compatible with our previous SP200 family as well as popular industry standards. As with the orignal SP200 family, all models in this Series feature low–power CMOS construction and Sipex–patented (5,306,954) on-board charge pump circuitry to generate the ±10V RS-232 voltage levels, using 0.1µF charge pump capacitors to save board space and reduce circuit cost. The SP211E and SP213E models feature a low–power shutdown mode, which reduces power supply drain to 1µA. Enhancements include lower power supply current at 3mA typical (no load) and superior ESD performance. The ESD tolerance has been improved on this family to over ±15kV for both Human Body Model and IEC1000-4-2 Air Discharge test methods. Number of RS232 Model Drivers Receivers SP207E 5 3 SP208E 4 4 SP211E 4 5 SP213E 4 5 Table 1. Model Selection Table No. of Receivers No. of External Active in Shutdown 0.1µF Capacitors 0 4 0 4 0 4 2 4 Shutdown WakeUp TTL Tri–State No No No No No No Yes No Yes Yes Yes Yes SP207EDS/09 SP207E Series High Performance Transceivers © Copyright 2000 Sipex Corporation 1 ABSOLUTE MAXIMUM RATINGS These are stress ratings only and functional operation of the device at these or any other above those indicated in the operation sections of the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. VCC .................................................................. +6V V+ ....................................... (VCC – 0.3V) to +13.2V V– ................................................................ 13.2V Input Voltages TIN .......................................... –0.3V to (VCC +0.3V) RIN ................................................................ ±20V Output Voltages TOUT ................................ (V+, +0.3V) to (V–, –0.3V) ROUT ....................................... –0.3V to (VCC +0.3V) Short Circuit Duration on TOUT .............. Continuous Power Dissipation Per Package 24-pin SSOP (derate 11.2mW/oC above +70oC)....900mW 24-pin PDIP (derate 15.9mW/oC above +70oC)....1300mW 24-pin SOIC (derate 12.5mW/oC above +70oC)...1000mW 28-pin SSOP (derate 11.2mW/oC above +70oC)....900mW 28-pin SOIC (derate 12.7mW/oC above +70oC)...1000mW SPECIFICATIONS . VCC at nominal ratings; 0.1µF charge pump capacitors; TMIN to TMAX, unless otherwise noted. PARAMETER TTL INPUTS Logic Threshold VIL VIH Logic Pullup Current Maximum Transmssion Rate TTL OUTPUTS Compatibility VOL VOH Leakage Current MIN. TYP. MAX. UNIT CONDITIONS TIN, EN, SD 0.8 2.0 120 15 230 TTL/CMOS 0.4 3.5 0.05 +10 200 Volts Volts µA kbps TIN = 0V CL = 1000pF, RL = 3KΩ Volts Volts µA 0V ≤ ROUT ≤ VCC ; SP211 EN = 0V; SP213 EN = VCC TA = +25°C IOUT = 3.2mA; VCC = +5V IOUT = –1.0mA RS232 OUTPUT Output Voltage Swing +5 +7 +25 +15 1.2 1.7 0.5 5 1.5 0.5 2.8 1.0 7 Volts Ω mA Volts Volts Volts Volts kΩ µs µs V/µs µs ns ns Output Resistance 300 Output Short Circuit Current RS232 INPUT Voltage Range –15 Voltage Threshold Low 0.8 High Hysteresis 0.2 Resistance 3 DYNAMIC CHARACTERISTICS Driver Propagation Delay Receiver Propagation Delay Instantaneous Slew Rate Transition Time Output Enable Time Output Disable Time All transmitter outputs loaded with 3KΩ to ground VCC = 0V; VOUT = +2V Infinite duration, VOUT = 0V VCC = 5V, TA = +25°C VCC = 5V, TA = +25°C VCC = +5V VIN =+15V; TA = +25°C TTL–to–RS-232 RS-232–to–TTL CL = 50pF, RL = 3–7KΩ; TA = +25°C; from +3V CL = 2,500pF, RL = 3KΩ; measured from +3V to –3V or –3V to +3V 1.5 30 1.5 400 250 SP207EDS/09 SP207E Series High Performance RS232 Transceivers © Copyright 2000 Sipex Corporation 2 SPECIFICATIONS VCC at nominal ratings; 0.1µF charge pump capacitors; TMIN to TMAX, unless otherwise noted. PARAMETER POWER REQUIREMENTS VCC SP207 All other parts ICC MIN. TYP. MAX. UNIT CONDITIONS 4.75 4.50 5.00 5.00 3 15 1 5.25 5.50 6 Volts Volts mA mA µA °C °C °C Shutdown Current 10 ENVIRONMENTAL AND MECHANICAL Operating Temperature Commercial, –C 0 +70 Extended, –E –40 +85 Storage Temperature –65 +125 Package –A Shrink (SSOP) small outline –T Wide (SOIC) small outline –P Narrow (PDIP) Plastic Dual-In-Line TA = +25°C No load; VCC = ±10% All transmitters RL = 3KΩ TA = +25°C Transmitter Output @ 120kbps RL=3KΩ, CL=1,000pF Transmitter Output @ 120kbps RL=3KΩ, CL=2,500pF Transmitter Output @ 240kbps RL=3KΩ, CL=1,000pF Transmitter Output @ 240kbps RL=3KΩ, CL=2,500pF SP207EDS/09 SP207E Series High Performance Transceivers © Copyright 2000 Sipex Corporation 3 PINOUT T3 OUT T1OUT T2OUT R1IN R1OUT T2IN T1IN GND VCC C1+ V+ C1– 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 T4 OUT R2IN R2OUT T5IN T5OUT T4IN T3IN R3OUT R3IN V– C2– C2+ T2 OUT T1OUT R2IN R2OUT T1IN R1OUT R1IN GND VCC C1+ V+ C1– 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 T3 OUT R3IN R3OUT T4IN T4OUT T3IN T2IN R4OUT R4IN V– C2– C2+ SP207E SP208E 19 18 17 16 15 14 13 19 18 17 16 15 14 13 T3 OUT T1OUT T2OUT R2IN R2OUT T2IN T1IN R1OUT R1IN GND VCC C1+ V+ C1– 1 2 3 4 5 6 28 27 26 25 24 23 T4 OUT R3IN R3OUT SHUTDOWN (SD) EN R4IN R4OUT T4IN T3IN R5OUT R5IN V– C2– C2+ T3 OUT T1OUT T2OUT R2IN R2OUT T2IN T1IN R1OUT R1IN GND VCC C1+ V+ C1– 1 2 3 4 5 6 28 27 26 25 24 23 T4 OUT R3IN R3OUT SHUTDOWN (SD) EN R4IN R4OUT T4IN T3IN R5OUT R5IN V– C2– C2+ SP211E SP213E 7 8 9 10 11 12 13 14 22 21 20 19 18 17 16 15 7 8 9 10 11 12 13 14 22 21 20 19 18 17 16 15 SP207EDS/09 SP207E Series High Performance RS232 Transceivers © Copyright 2000 Sipex Corporation 4 FEATURES As in the original RS-232 multi-channel products, the SP207E Series multi–channel RS-232 line transceivers provide a variety of configurations to fit most communication needs, especially those applications where +12V is not available. All models in this Series feature low–power CMOS construction and SIPEX– proprietary on-board charge pump circuitry to generate the +10V RS-232 voltage levels. The ability to use 0.1µF charge pump capacitors saves board space and reduces circuit cost. Different models within the Series provide different driver/receiver combinations to match any application requirement. The SP211 and SP213E models feature a low– power shutdown mode, which reduces power supply drain to 1µA. The SP213E includes a Wake-Up function which keeps two receivers active in the shutdown mode, unless disabled by the EN pin. The family is available in 28–pin SO (wide) and SSOP (shrink) small outline packages. Devices can be specified for commercial (0°C to +70°C) and industrial/extended (–40 ° C to +85 °C) operating temperatures. THEORY OF OPERATION The SP207E Series devices are made up of three basic circuit blocks — 1) transmitter/ driver, 2) receiver and 3) the S IPEX – proprietary charge pump. Each model within the Series incorporates variations of these circuits to achieve the desired configuration and performance. Charge–Pump The charge pump is a Sipex–patented design (5,306,954) and uses a unique approach compared to older less–efficient designs. The charge pump still requires four external capacitors, but uses a four–phase voltage shifting technique to attain symmetrical 10V power supplies. Figure 3a shows the waveform found on the positive side of capcitor C2, and Figure 3b shows the negative side of capcitor C2. There is a free–running oscillator that controls the four phases of the voltage shifting. A description of each phase follows. Phase 1 — VSS charge storage —During this phase of the clock cycle, the positive side of capacitors C1 and C2 are initially charged to +5V. Cl+ is then switched to ground and the charge in C1– is transferred to C2–. Since C2+ is connected to +5V, the voltage potential across capacitor C2 is now 10V. Phase 2 — VSS transfer — Phase two of the clock connects the negative terminal of C2 to the VSS storage capacitor and the positive terminal of C2 to ground, and transfers the generated –l0V to C 3. Simultaneously, the positive side of capacitor C 1 is switched to +5V and the negative side is connected to ground. Phase 3 — VDD charge storage — The third phase of the clock is identical to the first phase — the charge transferred in C1 produces –5V in the negative terminal of C1, which is applied to the negative side of capacitor C2. Since C2+ is at +5V, the voltage potential across C2 is l0V. VCC = +5V +5V C1 + – C4 + – + C2 + – – VDD Storage Capacitor VSS Storage Capacitor –5V –5V C3 Figure 1. Charge Pump — Phase 1 SP207EDS/09 SP207E Series High Performance Transceivers © Copyright 2000 Sipex Corporation 5 VCC = +5V C4 + – + C1 + – C2 + – – VDD Storage Capacitor VSS Storage Capacitor –10V C3 Figure 2. Charge Pump — Phase 2 Phase 4 — VDD transfer — The fourth phase of the clock connects the negative terminal of C2 to ground, and transfers the generated l0V across C2 to C4, the VDD storage capacitor. Again, simultaneously with this, the positive side of capacitor C1 is switched to +5V and the negative side is connected to ground, and the cycle begins again. Since both V+ and V– are separately generated from VCC; in a no–load condition V+ and V– will be symmetrical. Older charge pump approaches that generate V– from V+ will show a decrease in the magnitude of V– compared to V+ due to the inherent inefficiencies in the design. The clock rate for the charge pump typically operates at 15kHz. The external capacitors can be as low as 0.1µF with a 16V breakdown voltage rating. Transmitter/Driver The drivers are inverting transmitters, which accept either TTL or CMOS inputs and output the RS-232 signals with an inverted sense relative to the input logic levels. Typically, the RS-232 output voltage swing is +9V with no load, and +5V minimum with full load. The transmitter outputs are protected against infinite short–circuits to ground without degradation in reliability. The drivers of the SP211E, and SP213E can be tri–stated by using the SHUTDOWN function. In the “power-off” state, the output impedance will remain greater than 300 ohms, again satisfying the RS-232 specifications. Should the input of the driver be left open, an internal 400Kohm pullup resistor to VCC forces the input high, thus committing the output to a low state. The slew rate of the transmitter output is internally limited to a maximum of 30V/µs in order to meet the EIA standards (EIA RS-232D 2.1.7, Paragraph 5). The transition of the loaded output from high to low also meets the monotonicity requirements of the standard. +10V a) C2 + GND GND b) C2 – –10V Figure 3. Charge Pump Waveforms SP207EDS/09 SP207E Series High Performance RS232 Transceivers © Copyright 2000 Sipex Corporation 6 VCC = +5V +5V C1 + – C4 + – + C2 + – – VDD Storage Capacitor VSS Storage Capacitor –5V –5V C3 Figure 4. Charge Pump — Phase 3 VCC = +5V +10V C1 + – C4 + – + C2 + – – VDD Storage Capacitor VSS Storage Capacitor C3 Figure 5. Charge Pump — Phase 4 Receivers The receivers convert RS-232 input signals to inverted TTL signals. Since the input is usually from a transmission line where long cable lengths and system interference can degrade the signal, the inputs have a typical hysteresis margin of 500mV. This ensures that the receiver is virtually immune to noisy transmission lines. Should an input be left unconnected, a 5kΩ pulldown resistor to ground will commit the output of the receiver to a high state. SHUTDOWN MODE The SP211E, and SP213E all feature a control input which will disable the device and reduce the power supply current to less than 10µA, making the parts ideal for battery–powered systems. In the “shutdown” mode the receivers and transmitters will both be tri–stated. The V+ output of the charge pump will discharge to VCC, and the V– output will discharge to ground. Products with the Wake-Up function can enable or disable the receivers during shutdown. For complete shutdown to occur and the 10µA power drain to be realized, the following conditions must be met: SP211E: • +5V must be applied to the SD pin • ENABLE must be either 0V, +5.0V or not connected • the transmitter inputs must be either +5.0V or not connected • VCC must be +5V • Receiver inputs must be >0V and 0V and