SP3224E-SP3227E Solved by TM 3.0V to 5.5V RS-232 Transceivers with Auto On-Line® Plus FEATURES ■ 15kV ESD protected RS-232 I/O pins ■ Auto On-line® Plus automatic power saving mode ■ Meets true EIA/TIA-232-F standards from +3.0V to +5.5V power supply. ■ Adheres to EIA/TIA-562 for interoperability with EIA/TIA-232 down to a +2.7V supply voltage ■ Regulated charge pump yields stable RS-232 outputs ■ Drop-in replacement to MAX3224, ICL3224, MAX3225, ICL3225, MAX3226, ICL3226, MAX3227 and ICL3227 ■ SP3224E and SP3225E reduced EMI with a slew rate controlled 250kbps data rate ■ SP3226E and SP3227E- high speed data rate of 1 Mbps. ■ Available in RoHS compliant, Lead Free Packaging READY 1 C1+ 2 20 SHUTDOWN 19 VCC 18 GND V+ 3 4 C2+ 5 C2- 6 SP3224E SP3225E V- 7 C1- Solved by TM 8 9 R2OUT 10 T2OUT R2IN 17 T1OUT 16 R1IN 15 R1OUT 14 ONLINE 13 T1IN 12 T2IN 11 STATUS TYPICAL APPLICATIONS ■ Diagnostic/Serial ports on embedded applications ■ Handheld Test Equipment ■ PC related Peripherals and Equipment ■ Battery Powered Equipment ■ Point-of-sale Equipment ■ Set-top Box DESCRIPTION The SP3224E/3225E are 2-driver/2-receiver devices and the SP3226E/SP3227E are 1driver/1-receiver devices. All are ideal for computer peripherals, point-of-sale equipment, consumer and embedded applications. These devices use an internal high-efficiency, charge-pump power supply that requires only 0.1µF capacitors in 3.3V operation. This charge pump and Sipex’s driver architecture allow it to deliver compliant RS-232 performance from a single power supply ranging from +3.0V to +5.5V. At voltages between 2.7V and 3.0V the driver outputs are compliant with RS-562 and can interface to RS-232 over short cables. The Auto On-line® Plus feature allows the device to automatically “wake-up” during a shutdown state upon detecting activity and to enter a low power shutdown if idle. This power saving feature functions without system intervention or modifications to software or drivers. SELECTION TABLE All devices feature 3.0V to 5.5V power supply, 4 small charge pump capacitors, and 15kV ESD protection. Device Data Rate (bps) No. of Drivers/Receivers READY pin Low-Power Shutdown Package SP3224E 250k 2/2 Yes Auto On-Line® Plus 20 SSOP/TSSOP SP3225E 1M 2/2 Yes Auto On-Line® Plus 20 SSOP/TSSOP SP3226E 250k 1/1 Yes Auto On-Line® Plus 16 SSOP/TSSOP SP3227E 1M 1/1 Yes Auto On-Line® Plus 16 SSOP/TSSOP Rev P 11/20/06 SP3224E-SP3227E Transceivers with Auto On-line 1 ® Plus © 2006 Sipex Corporation ABSOLUTE MAXIMUM RATINGS Supply Voltage (Vcc).................................................-0.3V to + 6.0V V+ (Note 1)................................................................-0.3V to + 7.0V V- (Note 1).................................................................+0.3V to - 7.0V |V+| + |V-| .................................................................................+13V Input voltage at TTL input pins ............................-0.3V to Vcc+0.3V RxIN......................................................................................... ±18V Driver output (from Ground).................................................. ±13.2V RxOUT, STATUS..................................................-0.3V to Vcc+0.3V Short Circuit Duration, TxOUT to GND,. Continuous (One output at a time maximum) Storage Temperature...............................................-65°C to +150°C Operating Temperature SP322XECX...........................0°C to +70°C Operating Temperature SP322XEEX........................-40°C to +85°C Lead Temperature (soldering, 10s)....................................... +300°C Maximum junction temperature.....................................................150°C Thermal Derating, Junction to Ambient SSOP20..............................................................................θJA =83°C/W TSSOP20.......................................................................θJA =110.7°C/W SSOP16..............................................................................θJA =87°C/W TSSOP16.......................................................................θJA =100.4°C/W These are stress ratings only and functional operation of the device at these ratings 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. Note 1: V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V. ELECTRICAL SPECIFICATIONS Unless otherwise noted VCC = +3.0V to +5.5V, TAMB = TMIN to TMAX,. Typical values are at TAMB = +25°C. C1–C4 = 0.1µF tested at 3.3V ±10%. C1=0.047µF C2–C4 = 0.33µF tested at 5V ±10%. Parameters Symb Test Conditions Min. Typ. Max. Unit DC Characteristics Supply Current, Auto On-Line® Plus ICC3 Receivers idle, TxIN = Vcc or GND, ONLINE = GND, SHUTDOWN = Vcc Note 2 1 10 µA Supply Current, Shutdown ICC2 SHUTDOWN = GND 1 10 µA Supply Current, Active ICC1 ONLINE = SHUTDOWN = Vcc, No Load 1.5 2.0 mA ICC1 ONLINE = SHUTDOWN = VCC=3.3V, No Load 0.7 1.0 mA VIH Vcc = 3.3V 2 VIH Vcc = 5.0V 2.4 0.8 V Supply Current, Active Driver Input and Logic Input Pins High Logic Input Voltage Low VIL Logic Threshold VT 1.5 IIL 0.05 VHYS 100 Logic Input Leakage Current Logic Input Hysteresis ±1.0 µA mV Receiver Outputs and STATUS Output Receiver Output Voltage Low VOL IOUT = -1.6mA Receiver Output Voltage High VOH IOUT = 1mA 0.4 Vcc - 0.6 V V Note 2: Characterized, not 100% tested. Rev P 11/20/06 SP3224E-SP3227E Transceivers with Auto On-line 2 ® Plus © 2006 Sipex Corporation ELECTRICAL SPECIFICATIONS Unless otherwise noted VCC = +3.0V to +5.5V, TAMB = TMIN to TMAX,. Typical values are at TAMB = +25°C. C1–C4 = 0.1µF tested at 3.3V ±10%. C1=0.047µF C2–C4 = 0.33µF tested at 5V ±10%. Parameters Symb Test Conditions Min. Typ. ±5.0 ±6.0 Max. Driver Outputs Output Voltage Swing VO Output load = 3kΩ to GND Output load = Open Circuit Short Circuit Current VOUT = 0V Power-Off Impedance Vcc=V+ = V- = 0 transmitter outputs= ±2V Output Leakage Current Vcc = 0 or 3V to 3.3V, VOUT = ±12V, Drivers disabled V ±15.0 ±60 300 10M mA Ω ±25 µA 15 V Receiver Inputs Input Voltage Range -15 Input Threshold Low Input Threshold High Vcc = 3.3V 0.6 1.2 Vcc = 5.0V 0.8 1.5 V Vcc = 3.3V 1.5 2.4 Vcc = 5.0V 1.8 2.4 Input Hysteresis 500 Input Resistance 3 5 V mV 7 kΩ ESD Protection ESD Protection for R_In, T_Out pins Human Body Model ±15 kV All Other Pins Human Body Model ±2 kV ® Auto On-line Plus (ONLINE = GND, SHUTDOWN = Vcc) Rx Input Threshold to STATUS output high ±2.7 Rx Input Threshold to STATUS output low Threshold to STATUS high ±0.3 tSTH Threshold to STATUS low tSTL Rx or Tx transition to drivers enabled tONLINE Note 3 Last Rx or Tx transition to drivers disabled tOFFLINE Note 2, 3 V 0.5 µs 30 µs 100 15 V 30 µs 60 sec Note 3: A transmitter/receiver edge is defined as a transition through input logic thresholds. Rev P 11/20/06 SP3224E-SP3227E Transceivers with Auto On-line 3 ® Plus © 2006 Sipex Corporation TIMING CHARACTERISTICS Unless otherwise noted VCC = +3.0V to +5.5V, TAMB = TMIN to TMAX,. Typical values are at TAMB = +25°C. C1–C4 = 0.1µF tested at 3.3V ±10%. C1=0.047µF C2–C4 = 0.33µF tested at 5V ±10% Parameters Symbol Test Conditions Min. Typ. Max. Unit SP3224E and SP3226E Maximum Data Rate RL = 3kΩ, CL = 1000pF. One transmitter switching. Transition -Region Slew Rate Measurement taken from +3.0V to -3.0V or -3.0V to +3.0V, TAMB = 25°C RL = 3kΩ to 7kΩ, CL = 150pF to 1000pF Receiver Propagation Delay tRPHL , tRPLH Receiver Output Enable Time tRZH , tRZL Receiver Output Disable Time tRHZ , tRLZ Receiver Skew Parameters 250 kbps 4 30 V/µs R_IN to R_OUT, CL = 150pF 0.22 RL = 3kΩ, CL = 150pF 0.2 2 µs 0.2 2 µs |tPHL - tPLH| at 1.5V Symbol µs 200 Test Conditions Min. Typ. ns Max. Unit SP3225E and SP3227E Maximum Data Rate RL = 3kΩ, CL = 250pF. One transmitter Switching 1000 kbps RL = 3kΩ, CL = 1000pF. One transmitter Switching 500 kbps Measurement taken from +3.0V to -3.0V or -3.0V to +3.0V, TAMB=25°C Instantaneous Slew Rate 24 150 V/µs RL = 3kΩ to 7kΩ, CL = 150pF to 250pF Driver Skew Receiver Propagation Delay |tDPHL - tDPLH| tRPHL , tRPLH at zero crossing R_IN to R_OUT, CL = 150pF 75 ns 0.20 µs Receiver Output Enable Time tRZH , tRZL 0.3 2 µs Receiver Output Disable Time tRHZ , tRLZ 0.2 2 µs Receiver Skew |tPHL - tPLH| Rev P 11/20/06 at 1.5V 80 SP3224E-SP3227E Transceivers with Auto On-line 4 ® Plus ns © 2006 Sipex Corporation TYPICAL PERFORMANCE CHARACTERISTICS:CURVES 1.6 TxIn to RxOut Propagation Delay (us) TxIn to RxOut Propagation Delay (us) 2.5 2 1.5 1 0.5 0 1000 1.2 1 0.8 0.6 0.4 TxIn 0.2 to RxOut Propagation Delay (us) TxIn to RxOut Propagation Delay (us) 0 1.4 2000 3000 4000 0 0 5000 1000 2000 4000 5000 SP3225E/SP3227E Transmitter Input to Receiver Output Propagation Delay vs. Load Capacitance SP3224E/SP3226E Transmitter Input to Receiver Output Propagation Delay vs. Load Capacitance 45 Transmitter Output Slew Rate (V/us) 30 Transmitter Output Slew Rate (V/us) 3000 Load Capacitance (pF) Load Capacitance (pF) 25 20 SRneg 15 SRavg 10 SRpos 5 Transmitter Output Slew Rate (V/us) 0 0 1000 2000 3000 4000 40 35 SRpos 30 SRavg 25 SRneg 20 15 10 5 Transmitter Output Slew Rate (V/us) 0 5000 0 Load Capacitance (pF) 1000 2000 3000 4000 5000 Load Capacitance (pF) SP3225E/SP3227E Transmitter Output Slew Rate vs. Load Capacitance SP3224E/SP3226E Transmitter Output Slew Rate vs. Load Capacitance 6 6 4 Transmitter Output Voltage (V) Transmitter Output Voltage (V) V+ 2 0 -2 V+ 4 2 0 -2 Trasmitter Output Voltage (V) -4 V- Transmitter Output Voltage (V) -4 V- -6 -6 0 1000 2000 3000 4000 5000 0 1000 Load Capacitance (pF) SP3224E/SP3226E Transmitter Output Voltage vs. Load Capacitance Rev P 11/20/06 2000 3000 4000 5000 Load Capacitance (pF) SP3225E/SP3227E Transmitter Output Voltage SP3224E-SP3227E Transceivers with Auto On-line 5 ® Plus © 2006 Sipex Corporation TYPICAL PERFORMANCE CHARACTERISTICS:CURVES Transmitter Skew (ns) 250 200 SP3225, 1Mbps 150 SP3224, 250kbps 100 Transmitter Skew (ns) 50 0 0 500 1000 1500 2000 2500 3000 3500 Load Capacitance (pF) Driver Skew vs. Load Capacitance 30 Supply Current (mA) 25 SP3225, 1Mbps SP3227 20 15 SP3224, 250kbps SP3226 10 Supply Current (mA) 5 0 0 1000 2000 3000 4000 5000 Load Capacitance (pF) Supply Current vs. Load Capacitance Charge Pump Turn-on Time versus Temperature Charge Pump Turn-On Time (us) 85 80 75 70 65 60 Charge Pump Turn-on Time (us) 55 50 -55 -30 -5 20 45 70 95 Temperature (C) Charge Pump Turn-On Time vs. Temperature Rev P 11/20/06 SP3224E-SP3227E Transceivers with Auto On-line 6 ® Plus © 2006 Sipex Corporation TYPICAL PERFORMANCE CHARACTERISTICS: SCOPE SHOTS SP3224E/SP3226E Waveforms for 250kbps Clock Rate, RL=3kΩ, CL=1000pF SP3224E/SP3226E Charge Pump Into Shutdown SP3224E/SP3226E Waveforms for 250kbps Clock Rate, RL=3kΩ, CL=4700pF SP3224E/SP3226E Charge Pump Power On Time, Vcc=3.3V SP3224E/SP3226E Charge Pump Out of Shutdown SP3224E/SP3226E Charge Pump Waveforms for 250kbp Clock Rate All Charge Pump waveforms use charge pump capacitor values C1-C4 = 0.1µF Rev P 11/20/06 SP3224E-SP3227E Transceivers with Auto On-line 7 ® Plus © 2006 Sipex Corporation TYPICAL PERFORMANCE CHARACTERISTICS: SCOPE SHOTS SP3224E/SP3226E C2+ Charge Pump Waveforms, Vcc=3.3V, All Channels switching SP3225E/SP3227E Waveforms for 1Mbps Clock Rate, RL=3KΩ, CL=250pF SP3224E/SP3226E C2+ Charge Pump Waveforms, Vcc=5V, All Channels switching SP3225E/SP3227E Waveforms for 1Mbps Clock Rate, RL=3KΩ, CL=1000pF SP3225E/SP3227E Waveforms for 1Mbps Clock Rate, RL=3KΩ, CL=50pF SP3225E/SP3227E Charge Pump Out of Shutdown All Charge Pump waveforms use charge pump capacitor values C1-C4 = 0.1µF Rev P 11/20/06 SP3224E-SP3227E Transceivers with Auto On-line 8 ® Plus © 2006 Sipex Corporation TYPICAL PERFORMANCE CHARACTERISTICS SP3225E/SP3227E Charge Pump Into Shutdown SP3225E/SP3227E Charge Pump Waveforms, Vcc=3.3V, All Channel Switching SP3225E/SP3227E Charge Pump Power On Time, Vcc=3.3V SP3225E/SP3227E Charge Pump Waveforms, Vcc=5V, All Channel Switching SP3225E/SP3227E Charge Pump Waveforms for 1Mbps Clock Rate All Charge Pump waveforms use charge pump capacitor values C1-C4 = 0.1µF Rev P 11/20/06 SP3224E-SP3227E Transceivers with Auto On-line 9 ® Plus © 2006 Sipex Corporation CHARACTERIZATION CIRCUITS AND WAVEFORMS Generator (see note B) RS-232 Output 50Ω 0V tTHL CL (see note A) RL 3V SHUTDOWN 3V Input tTLH 3V -3V 3V -3V Output VOH VOL 6V SR= tTHL or tTLH TEST CIRCUIT VOLTAGE WAVEFORMS NOTES A. CL includes probe and jig capacitance B. The pulse generator has the following characteristics: PRR= 250kbit/s, Zo=50Ω, 50% duty cycle, tr ≤10ns, tf ≤10ns Figure 1. Driver Slew Rate Generator (see note B) 50Ω RL 1.5V 50% 50% Skew= ItDPHL- tDPLHI 0V tDPLH Output TEST CIRCUIT 1.5V tDPHL CL (see note A) 3V SHUTDOWN 3V Input RS-232 Output VOH VOL VOLTAGE WAVEFORMS NOTES A. CL includes probe and jig capacitance B. The pulse generator has the following characteristics: PRR= 250kbit/s, Zo=50Ω, 50% duty cycle, tr ≤10ns, tf ≤10ns Figure 2. Driver Propagation and Skew 3V or 0V ONLINE Generator (see note B) RS-232 Output 50Ω 1.5V Skew= ItRPHL- tRPLHI 0V tRPLH Output TEST CIRCUIT 1.5V tRPHL CL (see note A) 3V SHUTDOWN 3V Input 50% 50% VOH VOL VOLTAGE WAVEFORMS NOTES A. CL includes probe and jig capacitance B. The pulse generator has the following characteristics: PRR= 250kbit/s, Zo=50Ω, 50% duty cycle, tr ≤10ns, tf ≤10ns Figure 3. Receiver Propagation Delay and Skew 3V Input 3V or 0V ONLINE VCC S1 1.5V 0V tPHZ (51 at GND) RL tPZH Output 3V or 0V CL (see note A) SHUTDOWN Generator (See Note B) 1.5V GND VOH Output 0.3V 50% tPZL (S1 at VCC) tPLZ (51 at VCC) 50Ω 0.3V Output 50% VOL TEST CIRCUIT VOLTAGE WAVEFORMS NOTES: A CL includes probe and jig capacitance B. The pulse generator has the folowing characteristics Zo=50Ω, 50% duty cycle, tr ≤10ns, tf ≤10ns C. tPLZ and tPHZ are the same as tdis D. tPZL and tPZH are the same as ten Figure 4. Receiver Enable and Disable Times Rev P 11/20/06 SP3224E-SP3227E Transceivers with Auto On-line 10 ® Plus © 2006 Sipex Corporation THEORY OF OPERATION rates fully loaded with 3KΩ in parallel with 1000pF (SP3224E/SP3226E), or 3KΩ in parallel with 250pF (SP3225E/SP3227E) ensuring compatibility with PC-to-PC communication software. The slew rate of the driver output on the SP3224E/SP3226E 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 Slew Rate of SP3225E/SP3227E is not limited to enable higher speed data transfers. The transition of the loaded output from HIGH to LOW also meets the monotonic signal transition requirements of the standard. Description The SP3224E and SP3225E are 2-driver/ 2-receiver devices. The SP3226E and SP3227E are 1-driver/1-receiver devices. All are ideal for serial ports in embedded, consumer, portable, or handheld applications. The transceivers meet the EIA/TIA232 and ITU-T V.28/V.24 communication protocols for reliable serial communication. The devices feature Sipex’s proprietary and patented (U.S. 5,306,954) on-board charge pump circuitry that generates ±5.5V RS-232 voltage levels from a single +3.0V to +5.5V power supply. The SP3224E-SP3227E are ideal choices for power sensitive designs. With the Auto On-line® Plus enabled, the SP3224ESP3227E reduce supply current to 1µA whenever the transceivers are in idle. In shutdown, the internal charge pump and the drivers will shut down. This feature allows design engineers to address power saving concerns without major design changes. Receivers The receivers convert EIA/TIA-232 signal levels to TTL or CMOS logic output levels. Receivers remain active during device shutdown. Since receiver 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, an internal 5KΩ pulldown resistor to ground will commit the output of the receiver to a HIGH state. Theory Of Operation The SP3224E-SP3227E are made up of four basic circuit blocks: 1. Drivers, 2. Receivers, 3. the Sipex proprietary charge pump, and 4. Auto On-line® Plus circuitry. Charge Pump The charge pump is a Sipex–patented design (US Patent #5,306,954) and uses a unique approach compared to older lessefficient designs. The charge pump still requires four external capacitors, but uses a four phase voltage shifting technique to attain symmetrical 5.5V power supplies. The internal power supply consists of a regulated dual charge pump that provides output voltages 5.5V regardless of the input voltage (Vcc) over the +3.0V to +5.5V range. This is important to maintain compliant RS-232 levels regardless of power supply fluctuations. The charge pump operates in a discontinuous mode using an internal oscillator. If the output voltages are less than a magnitude Drivers The drivers are inverting level transmitters that convert TTL or CMOS logic levels to 5.0V EIA/TIA-232 levels with an inverted sense relative to the input logic levels. Typically, the RS-232 output voltage swing is +5.4V with no load and +5V minimum fully loaded. The driver outputs are protected against infinite short-circuits to ground without degradation in reliability. These drivers comply with the EIA-TIA232-F and all previous RS-232 versions. Unused driver inputs should be connected to GND or VCC. The drivers can guarantee output data Rev P 11/20/06 SP3224E-SP3227E Transceivers with Auto On-line 11 ® Plus © 2006 Sipex Corporation THEORY OF OPERATION is identical to the first phase. The positive terminals of capacitors C1 and C2 are charged from VCC with their negative terminals initially connected to ground. C1+ is then connected to ground and the stored charge from C1– is superimposed onto C2–. Since C2+ is still connected to VCC the voltage potential across capacitor C2 is now 2 x VCC. of 5.5V, the charge pump is enabled. If the output voltages exceed a magnitude of 5.5V, the charge pump is disabled. This oscillator controls the four phases of the voltage shifting. A description of each phase follows. Highly Efficient Charge Pump The 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 3.0 or 5.5V power supply. 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 C3. Meanwhile, capacitor C1 charged from VCC to prepare it for its next phase. The charge pumps use four external capacitors to hold and transfer electrical charge. The Sipex 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. The Sipex charge pump generates V+ and V– independently from VCC. Hence in a noload 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. Phase 1 VSS charge store and double: The positive terminals of capacitors C1 and C2 are charged from VCC with their negative terminals initially connected to ground. C1+ is then connected to ground and the stored charge from C1– is superimposed onto C2– . Since C2+ is still connected to VCC the voltage potential across capacitor C2 is now 2 x VCC. 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 powerefficient innovation can greatly reduce total power consumption. This improvement is made possible by the independent phase sequence of the Sipex charge pump design. 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 C4. Meanwhile, capacitor C1 charged from VCC to prepare it for its next phase. The clock rate for the charge pump typically operates at greater than 70kHz allowing the pump to run efficiently with small 0.1µF capacitors. Efficient operation depends on rapidly charging and discharging C1 and C2, therefore capacitors should be mounted close to the IC and have low ESR (equivalent series resistance). Inexpensive surface mount ceramic capacitors (such as Phase 3 VDD charge store and double: Phase three Rev P 11/20/06 SP3224E-SP3227E Transceivers with Auto On-line 12 ® Plus © 2006 Sipex Corporation THEORY OF OPERATION The SP3224E-SP3227E devices have the advanced Auto On-Line® Plus feature RS-232 signals use both positive and negative voltages of greater than ±5V magnitude. Receivers have nominal 5kΩ impedance to ground. Even when idle, drivers will maintain output signal voltage creating a continuous current flow. In low power, battery operated devices this constant current drain can decrease battery life significantly. are widely used for power-supply decoupling) are ideal for use on the charge pump. 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 on the Typical Operating Circuit. Capacitance values may be increased if operating at higher VCC or to provide greater stability as the capacitors age. + V CC - Phase 2 – Vss transfer from C2 to C4. Meanwhile C1 is charged to Vcc + + V CC - C Phases 1 and 3: Store/Double. Double charge from C1 onto C2. C2 is now charged to -2xVcc + 1 C e- + 2 V+ e- e- C 3 + C Vss 4 + C + 1 C + 2 ee- V+ C V- + Patented 5,306,954 (Sipex, inc.) 3 C + V CC - 4 Phase 4 VDD transfer from C2 to C3. Meanwhile C1 is charged to Vcc V e+ C + 1 C e- DD + e+ + V+ C 3 2 V- + C 4 Charge Pump Phases Minimum Recommended Charge Pump Capacitor Values Input Voltage VCC Charge Pump Capacitor Value for SP32XX 3.0V to 3.6V C1-C4=0.1µF 4.5V to 5.5V C1=0.047µF, C2-C4=0.33µF 3.0V to 5.5V C1-C4=0.22µF Charge Pump Capacitor Values Rev P 11/20/06 SP3224E-SP3227E Transceivers with Auto On-line 13 ® Plus © 2006 Sipex Corporation THEORY OF OPERATION that saves power by turning off the charge pumps and driver outputs when the transceiver inputs are idle for more than 30 seconds. Auto On-line® Plus is equivalent to Maxim’s “Auto Shutdown Plus” feature. It differs from our existing Auto On-line® by relying on signal transitions rather than voltage levels to trigger shutdown and wakeup. Auto On-Line® Plus automatically puts the device into a standby mode where it draws only 1µA typical. When the device detects activity on either the receiver or driver inputs it will automatically awake and activate to allow serial communication. Both the wakeup lifeand shutdown happen automatisignificantly. logic LOW forces the device into shutdown state regardless of input activity or the status of the ONLINE pin. The STATUS output determines whether a valid RS-232 signal voltage is present on the inputs. The STATUS pin goes to a logic LOW when the receiver input signal levels collapse near reference ground. This may occur when the RS-232 cable is disconnected or the RS-232 drivers of the connected peripheral are turned off. STATUS may be used to indicate DTR or a Ring Indicator signal or to determine whether a live RS232 driver or cable is connected. By connecting the STATUS output to ONLINE input, the SP3224E-SP3227E will shut down when no valid signal level and no input transitions are detected, and wake up on a valid signal level or signal edge. If it detects no signal transitions with the past 30 Receiver 5kΩ +0.3V R_IN -0.3V 30µs timer STATUS T_IN EDGE DETECT R_IN EDGE DETECT INVALID ASSERTED IF ALL RECEIVER INPUTS ARE BETWEEN +0.3V AND -0.3V FOR AT LEAST 30µS +2.7V -2.7V S 30s timer A AUTO ONLINE ONLINE Figure 3a.STATUS Functional Diagram STATUS low R_IN SHUTDOWN Figure 3c. Auto On-line® Plus Logic SHUTDOWN POWERDOWN ONLINE 30µs timer AUTO ONLINE STATUS POWERDOWN IS ONLY A INTERNAL SIGNAL. IT CONTROLS THE OPERATIONAL STATUS TO THE TRANSMITTERS AND THE POWER SUPPLIES. INVALID DEASSERTED IF ALL RECEIVER INPUTS ARE BETWEEN +2.7V AND -2.7V FOR AT LEAST 30µS Figure 3b. STATUS Functional Diagram, STATUS high. Figure 3d. Powerdown Logic cally, without any user intervention, special drivers, or software modifications. seconds, the device will go into low power mode. By connecting the STATUS output to both the ONLINE input and SHUTDOWN input pins, the device enters into shutdown when not receiving a valid RS-232 signal voltage input. Wakeup and shutdown can be externally controlled by the ONLINE and SHUTDOWN pins. When ONLINE is driven to logic LOW, the Auto On-line® Plus function is active. Driving SHUTDOWN to Rev P 11/20/06 When the SP3224E-SP3227E devices are SP3224E-SP3227E Transceivers with Auto On-line 14 ® Plus © 2006 Sipex Corporation THEORY OF OPERATION shut down, the charge pumps are turned off. V+ charge pump output decays to VCC,the V- output decays to GND. The decay time will depend on the size of capacitors used for the charge pump. Once in shutdown, the time required to exit the shutdown state and have valid V+ and V- levels is typically 50µs. When the SP3224E-SP3227E drivers and internal charge pump are disabled, the supply current is reduced to 1µA. Auto On-Line (existing) Device enters low-power mode if receiver inputs see less than valid +/- 3V. STATUS (or INVALID) signal output indicates if valid signal voltage is at receivers. Auto On-Line Plus (new) Device enters low-power mode if driver inputs or receiver inputs see no transitions for 30 seconds. Return to full power mode upon any transition on any driver input or receiver input Shutdown occurs even if data cable is connected to an active driver, as long as all inputs remain unchanged STATUS (or INVALID) signal functions as before. Indicates if valid signal voltage is present. But has no effect on shutdown For SP3224E the EN input is replaced with a READY output. READY drives high when charge pump achieves greater than -4V Vss (V-). Indicates “ready to transmit.” Comparison of Auto On-line® Features Rev P 11/20/06 Operating Mode ONLINE SHDN |RIN| > ±2.7V Idle Inputs (RxIN & TxIN) TxOUT RxOUT Forced Shutdown X 0 X X Hi-Z Active Forced On-Line 1 1 X X Active Active Auto On-Line Plus (Wake when active) 0 1 X Active Active Active Auto On Line Plus (Off-Line when idle) 0 1 X Idle > 30s Hi-Z Active Auto On-Line Plus (Wake on cable) STATUS 1 Yes X Active Active Auto On-Line Plus (Wake when active) STATUS 1 No Active Active Active Auto On-Line Plus (Off-Line when idle) STATUS 1 No Idle > 30s Hi-Z Active Auto On-Line (Wake on cable) STATUS STATUS Yes X Active Active Auto On-Line (Auto Shutoff) STATUS STATUS No X Hi-Z Active Auto On-line® Plus Truth Table SP3224E-SP3227E Transceivers with Auto On-line 15 ® Plus © 2006 Sipex Corporation THEORY OF OPERATION RECEIVER INPUTS INVALID } REGION TRANSMITTER INPUTS TRANSMITTER OUTPUTS STATUS Vcc t TSTL OUTPUT 0 Vcc OUTPUT t STH t OFFLINE t OFFLINE tONLINE tONLINE 0 V+ Vcc 0 V- Auto On-Line® Plus Timing Diagram tSTL (=30µs typ.) tSTH (=0.4µs typ.) tOFFLINE (=30s typ.) tONLINE (=100µs typ.) Rev P 11/20/06 SP3224E-SP3227E Transceivers with Auto On-line 16 ® Plus © 2006 Sipex Corporation TYPICAL OPERATING CIRCUIT +3.3V 19 0.1uF C5 2 C1+ C1 0.1uF 4 C15 C2+ C2 0.1uF 6 TTL/CMOS INPUTS Vcc V+ SP3224E SP3225E C3 0.1uF 7 C4 0.1uF C2- 13 T1IN T1OUT 17 12 T2IN T2OUT 8 15 R1OUT TTL/CMOS OUTPUTS V- 3 RS-232 OUTPUTS R1IN 16 RS-232 INPUTS 5kΩ 10 R2OUT R2IN 9 5kΩ 1 READY STATUS 14 ONLINE GND SHUTDOWN 11 20 VCC 18 +3.3V C5 C1 0.1uF 2 C1+ 4 5 C2 0.1uF 15 0.1uF 6 C1C2+ Vcc V+ SP3226E SP3227E C3 0.1uF 7 C4 0.1uF C2- 11 T1IN TTL/CMOS INPUT/OUTPUT V- 3 T1OUT 13 RS-232 OUTPUT + INPUT R1IN 8 9 R1OUT 5kΩ 10 1 READY STATUS 16 12 ONLINE VCC GND SHUTDOWN 14 Rev P 11/20/06 SP3224E-SP3227E Transceivers with Auto On-line 17 ® Plus © 2006 Sipex Corporation PINOUT DIAGRAMS READY 1 C1+ 2 V+ 3 20 SHUTDOWN 19 VCC 18 GND Solved by TM 17 T1OUT C1- 4 16 R1IN C2- 6 SP3224E 15 R1OUT SP3225E 14 ONLINE V- 7 13 T1IN T2OUT 8 12 T2IN R2IN 9 11 STATUS R2OUT 10 C2+ 5 READY 1 16 SHUTDOWN C1+ 2 Solved by V+ 3 C1- 4 C2+ 5 Rev P 11/20/06 15 VCC TM SP3226E SP3227E 14 GND 13 T1OUT 12 ONLINE C2- 6 11 T1IN V- 7 10 STATUS R1IN 8 9 R1OUT SP3224E-SP3227E Transceivers with Auto On-line 18 ® Plus © 2006 Sipex Corporation Rev P 11/20/06 SP3224E-SP3227E Transceivers with Auto On-line 19 ® Plus © 2006 Sipex Corporation Rev P 11/20/06 SP3224E-SP3227E Transceivers with Auto On-line 20 ® Plus © 2006 Sipex Corporation Rev P 11/20/06 SP3224E-SP3227E Transceivers with Auto On-line 21 ® Plus © 2006 Sipex Corporation Rev P 11/20/06 SP3224E-SP3227E Transceivers with Auto On-line 22 ® Plus © 2006 Sipex Corporation ORDERING INFORMATION Part number Temperature range Package Type SP3224ECA-L From 0°C to +70°C Lead Free 20 pin SSOP SP3224ECY-L From 0°C to +70°C Lead Free 20 pin TSSOP SP3224EEA-L From -40°C to +85°C Lead Free 20 pin SSOP SP3224EEY-L From -40°C to +85°C Lead Free 20 pin TSSOP SP3225ECA-L From 0°C to +70°C Lead Free 20 pin SSOP SP3225ECY-L From 0°C to +70°C Lead Free 20 pin TSSOP SP3225EEA-L From -40°C to +85°C Lead Free 20 pin SSOP SP3225EEY-L From -40°C to +85°C Lead Free 20 pin TSSOP SP3226ECA-L From 0°C to +70°C Lead Free 16 pin SSOP SP3226ECY-L From 0°C to +70°C Lead Free 16 PIN SSOP SP3226EEA-L From -40°C to +85°C Lead Free 16 pin SSOP SP3226EEY-L From -40°C to +85°C Lead Free 16 PIN TSSOP SP3227ECA-L From 0°C to +70°C Lead Free 16 PIN SSOP SP3227ECY-L From 0°C to +70°C Lead Free 16 PIN TSSOP SP3227EEA-L From -40°C to +85°C Lead Free 16 PIN SSOP SP3227EEY-L From -40°C to +85°C Lead Free 16 PIN TSSOP Available in Tape on Reel Sipex Corporation Headquarters and Sales Office 233 South Hillview Drive Milpitas, CA 95035 TEL: (408) 934-7500 FAX: (408) 935-7600 Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others. Rev P 11/20/06 SP3224E-SP3227E Transceivers with Auto On-line 23 ® Plus © 2006 Sipex Corporation