SP207EEA-L

SP207E–SP213E Low Power, High ESD +5V RS-232 Transceivers ■ Meets All EIA-232 and ITU V.28 Specifications ■ Single +5V Supply Operation ■ 3mA Typical Static Supply Current ■ 4 x 0.1μF External Charge Pump Capacitors ■ Typical 230kbps Transmission Rates ■ Standard SOIC and SSOP Footprints ■ 1μA Shutdown Mode (SP211E & SP213E) ■ Two Wake-Up Receivers (SP213E) ■ Tri-State/RxEnable (SP211E & SP213E) ■ Improved ESD Specifications: +5kV Human Body Model +5kV IEC000-4-2 Air Discharge +8kV IEC000-4-2 Contact Discharge +5V INPUT 0.1µF 6.3V 0.1µF 6.3V + 10 C1 + 9 VCC V+ V– 11 15 0.1µF + 6.3V 0.1µF 16V + 12 C – 1 + 13 C + 2 14 C2 – 0.1µF 16V SP207E 400kΩ T1 IN 7 TTL/CMOS INPUTS 400kΩ 6 T1 2 T1 OUT T2 IN 400kΩ 18 T2 3 T2 OUT T3 IN 400kΩ 19 T3 1 T3 OUT T4 IN 400kΩ 21 T4 24 T4 OUT T5 IN T5 20 T5 OUT R1 OUT R1 R1 IN Device SP207E SP208E SP211E SP213E Drivers 5 4 4 4 Receivers 3 4 5 5 Pins 24 24 28 28 R2 OUT 22 R2 5kΩ 5kΩ 5kΩ 8 GND 23 R2 IN R3 OUT 17 R3 16 R3 IN Table . Model Selection Table DESCRIPTION The SP207E-SP213E are enhanced transceivers intended for use in RS-232 and V.28 serial communication. These devices feature very low power consumption and single-supply operation making them ideal for space-constrained applications. Exar-patented (5,306,954) on-board charge pump circuitry generates fully compliant RS-232 voltage levels using small and inexpensive 0.µF charge pump capacitors. External +2V and -2V supplies are not required. The SP211E and SP213E feature a low-power shutdown mode, which reduces power supply drain to µA. SP213E includes two receivers that remain active during shutdown to monitor for signal activity. The SP207E-SP213E devices are pin-to-pin compatible with our previous SP207, SP208, SP2 and SP23 as well as industry-standard competitor devices. Driver output and receiver input pins are protected against ESD to over ±5kV for both Human Body Model and IEC000-4-2 Air Discharge test methods. Data rates of over 20kbps are guaranteed with 230kbps typical, making them compatible with high speed modems and PC remote-access applications. Receivers also incorporate hysteresis for clean reception of slow moving signals. Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP207E_00_072309  RS-232 INPUTS Now Available in Lead Free Packaging TTL/CMOS OUTPUTS 5 4 RS-232 OUTPUTS 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 +3.2V V– ................................................................. 3.2V 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 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.µF charge pump capacitors; TMIN to TMAX, unless otherwise noted. PARAMETER TTL INPuTS Logic Threshold VIL Logic Threshold VIH Logic Pull-Up Current Maximum Transmission Rate TTL OuTPuTS Compatibility VOL VOH Leakage Current MIN. TYP. MAx. 0.8 uNIT Volts Volts µA kbps CONDITIONS TIN, EN, SD 2.0 5 20 230 TTL/CMOS 0.4 3.5 0.05 +/-10 200 TIN = 0V CL = 000pF, RL = 3kΩ Volts Volts µA IOUT = 3.2mA: Vcc = +5V IOUT = -.0mA 0V ≤ VOUT ≤ Vcc; SP211E EN = 0V; SP23E EN = Vcc, TA = +25ºC All transmitter outputs loaded with 3kΩ to ground Vcc = 0V; VOUT = +/-2V Infinite Duration, VOUT = 0V RS-232 OuTPuT Output Voltage Swing Output Resistance Output Short Circuit Current RS-232 INPuT Voltage Range Voltage Threshold Low Voltage Threshold High Hysteresis Resistance DYNAMIC CHARACTERISTICS Driver Propagation Delay Receiver Propagation Delay Instantaneous Slew Rate .5 0.5 .5 30 µs µs V/µs TTL to RS-232 RS-232 to TTL CL = 50pF, RL = 3-7kΩ; TA = +25ºC; from +/-3V SP207E_00_072309 +/-5 300 +/-7 Volts Ω +/-25 -5 0.8 0.2 3 .2 .7 0.5 5 2.8 .0 7 +5 mA Volts Volts Volts Volts kΩ Vcc = 5V, TA = +25ºC Vcc = 5V, TA = +25ºC Vcc = 5V VIN = +/-15V, TA = +25ºC Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com 2 SPECIFICATIONS VCC at nominal ratings; 0.µF charge pump capacitors; TMIN to TMAX, unless otherwise noted. PARAMETER Transition Time MIN. TYP. MAx. .5 uNIT µs CONDITIONS CL = 2500pF, RL = 3kΩ, Measured from -3V to +3V or +3V to -3V DYNAMIC CHARACTERISTICS continued Output Enable Time Output Disable Time POwER REquIREMENTS Vcc SP207 Vcc all other parts Icc Icc Shutdown Current ENVIRONMENTAL AND MECHANICAL Operating Temperature Commercial, _C Extended, _E Storage Temperature Package _A _T 0 -40 -65 4.75 4.50 400 250 5.00 5.00 3 5  0 5.25 5.50 6 ns ns Volts Volts mA mA µA No Load: Vcc = +/-10%, TA = +25ºC All Transmitters RL = 3kΩ TA = +25ºC +70 +85 +25 ºC ºC ºC Shrink (SSOP) small outline Wide (SOIC) small outline Transmitter Output @ 120kbps RL=3KΩ, CL=,000pF Transmitter Output @ 120kbps RL=3KΩ, CL=2,500pF Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP207E_00_072309 3 Transmitter Output @ 240kbps RL=3KΩ, CL=,000pF Transmitter Output @ 240kbps RL=3KΩ, CL=2,500pF PINOuT Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP207E SP211E 4 SP208E SP213E SP207E_00_072309 FEATuRES The SP207E, SP208E, SP211E and SP213E multi–channel transceivers fit most RS-232/V.28 communication needs. All of these devices feature low–power CMOS construction and ExAR–proprietary on-board charge pump circuitry to generate RS-232 signal-voltages, making them ideal for applications where +9V and -9V supplies are not available. The highly efficient charge pump is optimized to use small and inexpensive 0.µF charge pump capacitors, saving board space and reducing overall circuit cost. Each device provides a different driver/ receiver combination to match standard application requirements. The SP207E is a 5-driver, 3-receiver device, ideal for DCE applications such as modems, printers or other peripherals. SP208E is a 4-driver/4receiver device, ideal for providing handshaking signals in V.35 applications or other general-purpose serial communications. The SP211E and SP213E are each 3-driver, 5-receiver devices ideal for DTE serial ports on a PC or other data-terminal equipment. The SP211E and SP213E feature a low– power shutdown mode, which reduces power supply drain to µA. 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 and 24 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 Exar RS-232 transceivers contain three basic circuit blocks — a) transmitter/driver, b) receiver and c) the ExAR–proprietary charge pump. SP211E and SP213E also include SHUTDOWN and ENABLE functions. Transmitter/Drivers The drivers are single-ended 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. Should the input of the driver be left open, an internal pullup to VCC forces the input high, thus committing the output to a logic- (MARK) state. The slew rate of the transmitter output is internally limited to a maximum of 30V/µs in order to meet the EIA/RS-232 and ITU V.28 standards. The transition of the output from high to low also meets the monotonicity requirements of the standard even when loaded. Driver output voltage swing is ±7V (typical) with no load, and ±5V or greater at maximum 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 this “power-off” state the charge pump is turned off and VCC current drops to µA typical. Driver output impedance will remain greater than 300Ω, satisfying the RS-232 and V.28 specifications. For SP211E SHUTDOWN is active when pin 25 is driven high. For SP213E SHUTDOWN is active when pin 25 is driven low. Receivers The receivers convert RS-232 level input signals to inverted TTL level signals. Because signals are often received from a transmission line where long cables and system interference can degrade signal quality, the inputs have enhanced sensitivity to detect weakened signals. The receivers also feature a typical hysteresis margin of 500mV for clean reception of slowly transitioning signals in noisy conditions. These enhancements ensure that the receiver is virtually immune to noisy transmission lines. Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP207E_00_072309 5 Receiver input thresholds are between .2 to .7 volts typical. This allows the receiver to detect standard TTL or CMOS logic-level signals as well as RS-232 signals. If a receiver input is left unconnected or un-driven, a 5kΩ pulldown resistor to ground will commit the receiver to a logic- output state. Highly Efficient Charge–Pump The onboard dual-output charge pump is used to generate positive and negative signal voltages for the RS-232 drivers. This enables fully compliant RS-232 and V.28 signals from a single power supply device. The charge pumps use four external capacitors to hold and transfer electrical charge. The Exar–patented design (US Patent #5,306,954) uses a unique approach compared to older, less–efficient designs. The pumps use a four–phase voltage shifting technique to attain symmetrical V+ and Vpower supplies. An intelligent control oscillator regulates the operation of the charge pump to maintain the proper voltages at maximum efficiency. Phase 1 VSS charge store and double — The positive terminals of capacitors C and C2 are charged from VCC with their negative terminals initially connected to ground. Cl+ is then connected to ground and the stored charge from C– is – superimposed onto C2 . Since C2+ is still connected to VCC the voltage potential across capacitor C2 is now 2 x VCC. VCC = +5V Phase 2 — VSS transfer and invert — Phase two connects the negative terminal of C2 to the VSS storage capacitor and the positive terminal of C2 to ground. This transfers the doubled and inverted (V-) voltage onto C3. Meanwhile, capacitor C charged from VCC to prepare it for its next phase. VCC = +5V C4 C1 + – C2 + – + – – + VDD Storage Capacitor VSS Storage Capacitor –10V C3 Figure 2. Charge Pump — Phase 2 Phase 3 VDD charge store and double —Phase three is identical to the first phase. The positive terminals of capacitors C and C2 are charged from VCC with their negative terminals initially connected to ground. Cl+ is then connected to ground and the stored charge from C– is superimposed onto C2–. Since C2+ is still connected to VCC the voltage potential across capacitor C25Vs now 2 x VCC. i V =+ CC +5V C1 + – C2 + – + C4 – + VDD Storage Capacitor VSS Storage Capacitor – –5V –5V C3 Figure 3. Charge Pump — Phase 3 +5V C1 + – C2 + – + C4 – + VDD Storage Capacitor VSS Storage Capacitor – –5V –5V C3 Figure . Charge Pump — Phase  Phase 4 VDD transfer — The fourth phase connects the negative terminal of C2 to ground and the positive terminal of C2 to the VDD storage capacitor. This transfers the doubled (V+) voltage onto C4. Meanwhile, capacitor C is charged from VCC to prepare it for its next phase. SP207E_00_072309 Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com 6 VCC = +5V +10V C1 + – C4 + – – + C2 + – VDD Storage Capacitor VSS Storage Capacitor C3 Figure 4. Charge Pump — Phase 4 The Exar charge-pump generates V+ and Vindependently from VCC. Hence in a no–load condition V+ and V- will be symmetrical. Older charge pump approaches generate V+ and then use part of that stored charge to generate V-. Because of inherent losses, the magnitude of V- will be smaller than V+ on these older designs. Under lightly loaded conditions the intelligent pump oscillator maximizes efficiency by running only as needed to maintain V+ and V-. Since interface transceivers often spend much of their time at idle, this power-efficient innovation can greatly reduce total power consumption. This improvement is made possible by the independent phase sequence of the Exar charge-pump design. The clock rate for the charge pump typically operates at greater than 5kHz, allowing the pump to run efficiently with small 0.1µF capacitors. Efficient operation depends on rapidly charging and discharging C and C2, therefore capacitors should be mounted close to the IC and have low ESR (equivalent series resistance). Low cost surface mount ceramic capacitors (such as are widely used for power-supply decoupling) are ideal for use on the charge pump. However the charge pumps are designed to be able to function properly with a wide range of capacitor styles and values. If polarized capacitors are used, the positive and negative terminals should be connected as shown. Voltage potential across any of the capacitors will never exceed 2 x VCC. Therefore capacitors with working voltages as low as 0V rating may be used with a nominal VCC supply. C will never see a potential greater than VCC , so a working voltage of 6.3V is adequate. The reference terminal of the VDD capacitor may be connected either to VCC or ground, but if connected to ground a minimum 6V working voltage is required. Higher working voltages and/or capacitance values may be advised if operating at higher VCC or to provide greater stability as the capacitors age. +10V a) C2+ gND gND b) C2– –10V Figure 5. Typical waveforms seen on capacitor C2 when all drivers are at maximum load. Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP207E_00_072309 7 SHuTDOwN MODE SP211E and SP213E feature a control input which will shut down the device and reduce the power supply current to less than 0µA, making the parts ideal for battery–powered systems. In shutdown mode the transmitters will be tri–stated, the V+ output of the charge pump will discharge to VCC, and the V– output will discharge to ground. Shutdown will tristate all receiver outputs of the SP211E. SP213E wAKEuP FuNCTION On the SP213E, shutdown will tri-state receivers -3. Receivers 4 and 5 remain active to provide a “wake-up” function and may be used to monitor handshaking and control inputs for activity. With only two receivers active during shutdown, the SP213E draws only 5–0µA of supply current. Many standard UART devices may be configured to generate an interrupt signal based on changes to the Ring Indicate (RI) or other inputs. A typical application of this function would be to detect modem activity with the computer in a power–down mode. The ring indicator signal from the modem could be passed through an active receiver in the SP213E that is itself in the shutdown mode. The ring indicator signal would propagate through the SP213E to the power management circuitry of the computer to power up the microprocessor and the SP213E drivers. After the supply voltage to the SP213E reaches +5.0V, the SHUTDOWN pin can be disabled, taking the SP213E out of the shutdown mode. All receivers that are active during shutdown maintain 500mV (typ.) of hysteresis. All receivers on the SP213E may be put into tri-state using the ENABLE pin. SHuTDOwN CONDITIONS For complete shutdown to occur and the 0µA power drain to be realized, the following conditions must be met: SP211E: • +5V must be applied to the SD pin • ENABLE must be either Ground, +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