SP3225EEA-L

Solved by SP3224E-SP3227E 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 V+ 3 20 SHUTDOWN 19 VCC 18 GND Solved by 4 C2+ 5 C2- 6 SP3224E SP3225E V- 7 C1- 17 T1OUT 16 R1IN 15 R1OUT 14 ONLINE 13 T1IN 12 T2IN 11 STATUS TM 8 9 R2OUT 10 T2OUT R2IN All devices feature 3.0V to 5.5V power supply, 4 small charge pump capacitors, and 15kV ESD protection. Device SP3224E SP3225E SP3226E SP3227E Data Rate (bps) 250k 1M 250k 1M No. of Drivers/Receivers 2/2 2/2 1/1 1/1 READY pin Yes Yes Yes Yes Low-Power Shutdown Auto On-Line® Plus Auto On-Line® Plus Auto On-Line® Plus Auto On-Line® Plus ® 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 Package 20 SSOP/TSSOP 20 SSOP/TSSOP 16 SSOP/TSSOP 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 Note 1: V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V. 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. 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 DC Characteristics Supply Current, Auto On-Line® Plus Supply Current, Shutdown Supply Current, Active Supply Current, Active Driver Input and Logic Input Pins High Logic Input Voltage Low Logic Threshold Logic Input Leakage Current Logic Input Hysteresis Receiver Outputs and STATUS Output Receiver Output Voltage Low Receiver Output Voltage High Note 2: Characterized, not 100% tested. VOL VOH IOUT = -1.6mA IOUT = 1mA Vcc - 0.6 0.4 V V VIH VIH VIL VT IIL VHYS 1.5 0.05 100 ±1.0 µA mV Vcc = 3.3V Vcc = 5.0V 2 2.4 0.8 V ICC3 ICC2 ICC1 ICC1 Receivers idle, TxIN = Vcc or GND, ONLINE = GND, SHUTDOWN = Vcc Note 2 SHUTDOWN = GND ONLINE = SHUTDOWN = Vcc, No Load ONLINE = SHUTDOWN = VCC=3.3V, No Load 1 1 1.5 0.7 10 10 2.0 1.0 µA µA mA mA Symb Test Conditions Min. Typ. Max. Unit Rev P 11/20/06 SP3224E-SP3227E Transceivers with Auto On-line ® 2 Plus © 2006 Sipex Corporation 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 Driver Outputs Output Voltage Swing VO Output load = 3kΩ to GND Output load = Open Circuit Short Circuit Current Power-Off Impedance Output Leakage Current Receiver Inputs Input Voltage Range Input Threshold Low Vcc = 3.3V Vcc = 5.0V Input Threshold High Vcc = 3.3V Vcc = 5.0V Input Hysteresis Input Resistance ESD Protection ESD Protection for R_In, T_Out pins All Other Pins Auto On-line Plus (ONLINE = GND, SHUTDOWN = Vcc) Rx Input Threshold to STATUS output high Rx Input Threshold to STATUS output low Threshold to STATUS high Threshold to STATUS low Rx or Tx transition to drivers enabled Last Rx or Tx transition to drivers disabled tSTH tSTL tONLINE tOFFLINE Note 3 Note 2, 3 15 ±0.3 0.5 30 100 30 60 ±2.7 ® ELECTRICAL SPECIFICATIONS Symb Test Conditions Min. Typ. Max. ±5.0 ±6.0 ±15.0 ±60 V VOUT = 0V Vcc=V+ = V- = 0 transmitter outputs= ±2V Vcc = 0 or 3V to 3.3V, VOUT = ±12V, Drivers disabled 300 10M mA Ω ±25 µA -15 0.6 0.8 1.2 1.5 1.5 1.8 500 3 5 15 V V 2.4 2.4 V mV 7 kΩ Human Body Model Human Body Model ±15 ±2 kV kV V V µs µs µs 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 SP3224E and SP3226E Maximum Data Rate RL = 3kΩ, CL = 1000pF. One transmitter switching. 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 tRPHL , tRPLH R_IN to R_OUT, CL = 150pF 250 kbps Symbol Test Conditions Min. Typ. Max. Unit Transition -Region Slew Rate 4 30 V/µs Receiver Propagation Delay Receiver Output Enable Time Receiver Output Disable Time Receiver Skew 0.22 µs tRZH , tRZL RL = 3kΩ, CL = 150pF 0.2 2 µs tRHZ , tRLZ |tPHL - tPLH| at 1.5V 0.2 200 2 µs ns Parameters SP3225E and SP3227E Symbol Test Conditions Min. Typ. Max. Unit Maximum Data Rate RL = 3kΩ, CL = 250pF. One transmitter Switching RL = 3kΩ, CL = 1000pF. One transmitter Switching Measurement taken from +3.0V to -3.0V or -3.0V to +3.0V, TAMB=25°C RL = 3kΩ to 7kΩ, CL = 150pF to 250pF 1000 500 kbps kbps Instantaneous Slew Rate 24 150 V/µs Driver Skew Receiver Propagation Delay Receiver Output Enable Time Receiver Output Disable Time Receiver Skew |tDPHL - tDPLH| tRPHL , tRPLH tRZH , tRZL tRHZ , tRLZ |tPHL - tPLH| at zero crossing R_IN to R_OUT, CL = 150pF 75 0.20 0.3 0.2 2 2 ns µs µs µs ns at 1.5V 80 Rev P 11/20/06 SP3224E-SP3227E Transceivers with Auto On-line ® 4 Plus © 2006 Sipex Corporation TYPICAL PERFORMANCE CHARACTERISTICS:CURVES 2.5 1.6 TxIn to RxOut Propagation Delay (us) TxIn to RxOut Propagation Delay (us) 1.4 1.2 1 0.8 0.6 0.4 2 1.5 1 0.5 TxIn to RxOut Propagation Delay (us) 0 0 1000 2000 3000 4000 5000 Load Capacitance (pF) TxIn to RxOut Propagation Delay (us) 0.2 0 0 1000 2000 3000 4000 5000 Load Capacitance (pF) SP3224E/SP3226E Transmitter Input to Receiver Output Propagation Delay vs. Load Capacitance 30 SP3225E/SP3227E Transmitter Input to Receiver Output Propagation Delay vs. Load Capacitance 45 Transmitter Output Slew Rate (V/us) Transmitter Output Slew Rate (V/us) 40 35 30 25 20 15 10 5 Transmitter Output Slew Rate (V/us) 0 0 1000 2000 3000 4000 5000 Load Capacitance (pF) SRavg SRneg SRpos 25 20 SRneg 15 SRavg 10 SRpos 5 Transmitter Output Slew Rate (V/us) 0 0 1000 2000 3000 4000 5000 Load Capacitance (pF) SP3224E/SP3226E Transmitter Output Slew Rate vs. Load Capacitance SP3225E/SP3227E Transmitter Output Slew Rate vs. Load Capacitance 6 V+ 6 V+ Transmitter Output Voltage (V) Transmitter Output Voltage (V) 2000 3000 4000 5000 4 4 2 2 0 0 -2 -2 Transmitter Output Voltage (V) -4 V-6 0 1000 Load Capacitance (pF) Trasmitter Output Voltage (V) -4 V-6 0 1000 2000 3000 4000 5000 Load Capacitance (pF) SP3224E/SP3226E Transmitter Output Voltage vs. Load Capacitance Rev P 11/20/06 SP3225E/SP3227E Transmitter Output Voltage ® SP3224E-SP3227E Transceivers with Auto On-line 5 Plus © 2006 Sipex Corporation TYPICAL PERFORMANCE CHARACTERISTICS:CURVES 250 Transmitter Skew (ns) 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 25 Supply Current (mA) 20 SP3225, 1Mbps SP3227 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 85 Charge Pump Turn-On Time (us) 80 75 70 65 60 Charge Pump Turn-on Time (us) 55 50 -55 -30 -5 20 Temperature (C) 45 70 95 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 Rev P 11/20/06 SP3225E/SP3227E Charge Pump Out of Shutdown ® All Charge Pump waveforms use charge pump capacitor values C1-C4 = 0.1µF 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 RS-232 Output 50Ω Input tTHL Output 3V -3V tTLH 3V -3V 3V 0V Generator (see note B) RL 3V SHUTDOWN CL (see note A) 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) RS-232 Output 50Ω Input tDPHL Output 3V 1.5V 1.5V tDPLH 50% 50% VOH VOL 0V RL 3V SHUTDOWN CL (see note A) TEST CIRCUIT Skew= ItDPHL- tDPLHI 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 RS-232 Output 50Ω 3V SHUTDOWN Input tRPHL Output 3V 1.5V 1.5V tRPLH 50% 50% VOH VOL 0V Generator (see note B) CL (see note A) TEST CIRCUIT 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 Skew= ItRPHL- tRPLHI VOLTAGE WAVEFORMS Figure 3. Receiver Propagation Delay and Skew Input 3V or 0V ONLINE 3V or 0V 3V 1.5V 1.5V 0V VCC S1 GND RL Output tPHZ (51 at GND) tPZH VOH 50% SHUTDOWN CL (see note A) Output 0.3V tPLZ (51 at VCC) Generator (See Note B) 50Ω tPZL (S1 at VCC) 50% VOL VOLTAGE WAVEFORMS 0.3V Output TEST CIRCUIT 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 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. 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. 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 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. 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. 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 ® SP3224E-SP3227E Transceivers with Auto On-line 11 Plus © 2006 Sipex Corporation 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. 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. 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. 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. Phase 3 VDD charge store and double: Phase three Rev P 11/20/06 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. 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 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. 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. 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 ® SP3224E-SP3227E Transceivers with Auto On-line 12 Plus © 2006 Sipex Corporation THEORY OF OPERATION 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. 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. + V CC - Phase 2 – Vss transfer from C2 to C4. Meanwhile C1 is charged to Vcc + + V CC - C + 1 C + 2 V+ e- C + 3 Phases 1 and 3: Store/Double. Double charge from C1 onto C2. C2 is now charged to -2xVcc e- e- C Vss 4 + C + 1 C + 2 V+ V- C + 3 Patented 5,306,954 (Sipex, inc.) + V CC - ee- C 4 Phase 4 VDD transfer from C2 to C3. Meanwhile C1 is charged to Vcc V e+ DD e+ + C + 1 C + 2 V+ V- C + 3 e- C 4 Charge Pump Phases Minimum Recommended Charge Pump Capacitor Values Input Voltage VCC 3.0V to 3.6V 4.5V to 5.5V 3.0V to 5.5V Charge Pump Capacitor Value for SP32XX C1-C4=0.1µF C1=0.047µF, C2-C4=0.33µF 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 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 lifandicashutdown happen automatie signif ntly . Receiver THEORY OF OPERATION 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 T_IN EDGE DETECT 5kΩ +0.3V R_IN -0.3V SHUTDOWN S 30s timer A AUTO ONLINE 30µs timer STATUS R_IN EDGE DETECT INVALID ASSERTED IF ALL RECEIVER INPUTS ARE BETWEEN +0.3V AND -0.3V FOR AT LEAST 30µS ONLINE Figure 3c. Auto On-line® Plus Logic Figure 3a.STATUS Functional Diagram STATUS low +2.7V R_IN -2.7V SHUTDOWN ONLINE 30µs timer STATUS AUTO ONLINE POWERDOWN INVALID DEASSERTED IF ALL RECEIVER INPUTS ARE BETWEEN +2.7V AND -2.7V FOR AT LEAST 30µS POWERDOWN IS ONLY A INTERNAL SIGNAL. IT CONTROLS THE OPERATIONAL STATUS TO THE TRANSMITTERS AND THE POWER SUPPLIES. Figure 3b. STATUS Functional Diagram, STATUS high. Figure 3d. Powerdown Logic cally, without any user intervention, special drivers, or software modifications. Wakeup and shutdown can be exter nally controlled by the O NLINE a nd 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 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. When the SP3224E-SP3227E devices are ® SP3224E-SP3227E Transceivers with Auto On-line 14 Plus © 2006 Sipex Corporation 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. THEORY OF OPERATION 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 Operating Mode ONLINE SHDN |RIN| > ±2.7V X X X X Yes No No Yes No Idle Inputs (RxIN & TxIN) X X Active Idle > 30s X Active Idle > 30s X X TxOUT RxOUT Forced Shutdown Forced On-Line Auto On-Line Plus (Wake when active) Auto On Line Plus (Off-Line when idle) Auto On-Line Plus (Wake on cable) Auto On-Line Plus (Wake when active) Auto On-Line Plus (Off-Line when idle) Auto On-Line (Wake on cable) Auto On-Line (Auto Shutoff) X 1 0 0 STATUS STATUS STATUS STATUS STATUS 0 1 1 1 1 1 1 STATUS STATUS Hi-Z Active Active Hi-Z Active Active Hi-Z Active Hi-Z Active Active Active Active Active Active Active Active Active Auto On-line® Plus Truth Table Rev P 11/20/06 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 0 V+ Vcc 0 V- t STH t OFFLINE tONLINE t OFFLINE tONLINE 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 C5 C1 0.1uF 0.1uF 2 C1+ 4 C15 C2+ 6 C2- 19 Vcc V+ 3 C3 0.1uF 7 C4 0.1uF C2 0.1uF SP3224E SP3225E V- 13 T1IN TTL/CMOS INPUTS T1OUT 17 RS-232 OUTPUTS 12 T2IN T2OUT 8 15 R1OUT TTL/CMOS OUTPUTS R1IN 16 5kΩ RS-232 INPUTS 10 R2OUT R2IN 9 5kΩ 1 READY STATUS 11 14 ONLINE GND 18 SHUTDOWN 20 VCC +3.3V C5 C1 0.1uF 0.1uF 2 C1+ 4 5 C2 0.1uF 6 C1C2+ C2T1OUT 13 RS-232 OUTPUT + INPUT 15 Vcc V+ 3 C3 0.1uF 7 C4 0.1uF SP3226E SP3227E V- 11 T1IN TTL/CMOS INPUT/OUTPUT 9 R1OUT R1IN 8 5kΩ 1 READY 12 ONLINE 10 STATUS 16 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 C1- 4 C2+ 5 Solved by 20 SHUTDOWN 19 VCC 18 GND TM 17 T1OUT 16 R1IN C2- 6 SP3224E 15 R1OUT SP3225E 14 ONLINE V- 7 13 T1IN T2OUT 8 12 T2IN R2IN 9 11 STATUS R2OUT 10 READY 1 C1+ 2 V+ 3 C1- 4 C2+ 5 C2VR1IN 6 7 8 Solved by 16 SHUTDOWN 15 VCC TM 14 GND 13 T1OUT 12 ONLINE 11 T1IN SP3226E SP3227E 10 STATUS 9 R1OUT Rev P 11/20/06 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 SP3224ECA-L SP3224ECY-L SP3224EEA-L SP3224EEY-L SP3225ECA-L SP3225ECY-L SP3225EEA-L SP3225EEY-L SP3226ECA-L SP3226ECY-L SP3226EEA-L SP3226EEY-L SP3227ECA-L SP3227ECY-L SP3227EEA-L SP3227EEY-L Temperature range From 0°C to +70°C From 0°C to +70°C From -40°C to +85°C From -40°C to +85°C From 0°C to +70°C From 0°C to +70°C From -40°C to +85°C From -40°C to +85°C From 0°C to +70°C From 0°C to +70°C From -40°C to +85°C From -40°C to +85°C From 0°C to +70°C From 0°C to +70°C From -40°C to +85°C From -40°C to +85°C Package Type Lead Free 20 pin SSOP Lead Free 20 pin TSSOP Lead Free 20 pin SSOP Lead Free 20 pin TSSOP Lead Free 20 pin SSOP Lead Free 20 pin TSSOP Lead Free 20 pin SSOP Lead Free 20 pin TSSOP Lead Free 16 pin SSOP Lead Free 16 PIN SSOP Lead Free 16 pin SSOP Lead Free 16 PIN TSSOP Lead Free 16 PIN SSOP Lead Free 16 PIN TSSOP Lead Free 16 PIN SSOP 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