SP502CF

® SP502 Multi–Mode Serial Transceiver ■ Single-Chip Serial Transceiver Supports Industry-Standard ■ Software-Selectable Protocols: — RS-232 (V.28) — RS-422A (V.11, X.27) — RS-449 — RS-485 — V.35 — EIA-530 ■ Programmable Selection of Interface ■ +5V-Only Operation ■ Six (6) Drivers and Seven (7) Receivers ■ Surface Mount Packaging DESCRIPTION… The SP502 is a highly integrated serial transceiver that allows software control of its interface modes. It offers hardware interface modes for RS-232 (V.28), RS-422A (V.11), RS-449, RS-485, V.35, and EIA-530. The SP502 is fabricated using low–power BiCMOS process technology, and incorporates a Sipex patented (5,306,954) charge pump allowing +5V only operation. Drivers Receivers SP502 Charge Pump Driver Decode Receiver Decode Rev. 7/21/03 SP502 Multi-Mode Serial Transceiver © Copyright 2003 Sipex Corporation 1 SPECIFICATIONS MIN. LOGIC INPUTS VIL VIH LOGIC OUTPUTS VOL VOH RS-485 DRIVER TTL Input Levels VIL VIH Outputs HIGH Level Output LOW level Output Differential Output Balance Open Circuit Voltage Output Current Short Circuit Current Transition Time Maximum Transmission Rate RS-485 RECEIVER TTL Output Levels VOL VOH Input HIGH Threshold LOW Threshold Common Mode Range HIGH Input Current LOW Input Current Receiver Sensitivity Input Impedance V.35 DRIVER TTL Input Levels VIL VIH Outputs Differential Output Output Impedance Transition Time Maximum Transmission Rate V.35 RECEIVER TTL Output Levels VOL VOH Receiver Sensitivity Input Impedance TYP. MAX. 0.8 2.0 0.4 2.4 UNITS Volts Volts Volts Volts IOUT= 3.2mA IOUT= 1.0mA CONDITIONS 0.8 2.0 +6.0 -0.3 ±5.0 ±0.2 ±6.0 ±250 120 5 Volts Volts Volts Volts Volts Volts Volts mA mA ns Mbps ±1.5 28.0 RL=54Ω, CL=50pF RL=54Ω Terminated in -7V to +12V Rise/fall time, 10%-90% 0 2.4 +0.2 -7.0 -7.0 0.4 +12.0 -0.2 +12.0 ±0.2 1 Volts Volts Volts Volts Volts Volts Unit Load (a)-(b) (a)-(b) Refer to graph Refer to graph Over -7V to +12V common mode range Refer to graph 0 2.0 ±0.44 50 5 0.8 ±0.66 150 40 Volts Volts Volts Ω ns Mbps With termination network; RL=100Ω With termination network 0 2.4 90 0.4 ±0.2 110 Volts Volts Volts Ω Over -7V to +12V common mode range With termination network Rev. 7/21/03 SP502 Multi-Mode Serial Transceiver © Copyright 2003 Sipex Corporation 2 SPECIFICATIONS (Continued) MIN. RS-422 DRIVER TTL Input Levels VIL VIH Outputs Differential Output Open Circuit Voltage,VO Balance Offset Short Circuit Current Power Off Current Transition Time Maximum Transmission Rate RS-422 RECEIVER TTL Output Levels VOL VOH Input HIGH Threshold LOW Threshold Common Mode Range HIGH Input Current LOW Input Current Receiver Sensitivity Input Impedance RS-232 DRIVER TTL Input Level VIL VIH Outputs HIGH Level Output LOW Level Output Open Circuit Voltage Short Circuit Current Power Off Impedance Slew Rate Transition Time Maximum Transmission Rate RS-232 RECEIVER TTL Output Levels VOL VOH Input HIGH Threshold LOW Threshold Receiver Open Circuit Bias Input Impedance RS-423 DRIVER TTL Input Levels VIL VIH Output HIGH Level Output LOW Level Output TYP. MAX. UNITS CONDITIONS 0 2.0 ±2.0 0.8 ±5.0 ±6.0 ±0.4 +3.0 ±150 ±100 60 Volts Volts Volts Volts Volts Volts mA µA ns Mbps RL=100Ω |VT| – |VT| Rise/fall time, 10%-90% 5 0 2.4 +0.2 -6.0 -10.0 0.4 +6.0 -0.2 +10.0 ±0.2 Volts Volts Volts Volts Volts Volts kΩ (a)-(b) (a)-(b) Refer to graph Refer to graph 4 0 2.0 +5.0 -15.0 -15 300 0.8 +15 -5.0 +15 ±100 30 1.56 Volts Volts Volts Volts Volts mA Ω V/µs µs Kbps RL=3kΩ, VIN=0.8V RL=3kΩ, VIN=2.0V RL=3kΩ, CL=15pF 120 0 2.4 0.8 0 3 1.7 1.2 5 0.4 2.4 +2.0 7 Volts Volts Volts Volts Volts kΩ 0 2.0 +3.6 –6.0 0.8 +6.0 –3.6 Volts Volts Volts Volts RL=450Ω RL=450Ω Rev. 7/21/03 SP502 Multi-Mode Serial Transceiver © Copyright 2003 Sipex Corporation 3 SPECIFICATIONS (Continued) MIN. TYP. RS-423 DRIVER Open Circuit Voltage ±4.0 Short Circuit Current Power Off Current Transition Time Maximum Transmission Rate 120 RS-423 RECEIVER TTL Output Levels VOL 0 VOH 2.4 Input HIGH Threshold +0.2 LOW Threshold -7.0 Common Mode Range -7.0 HIGH Input Current LOW Input Current Receiver Sensitivity Input Impedance 4 POWER REQUIREMENTS VCC 4.75 ICC 20 ENVIRONMENTAL AND MECHANICAL Operating Temperature Range 0 Storage Temperature Range -65 Package 80–pin QFP MAX. ±9.0 ±150 ±100 40 UNITS Volts mA µA µs kbps CONDITIONS Rise/fall time, 10-90% 0.4 +12.0 -0.2 +12.0 ±0.2 Volts Volts Volts Volts Volts Refer to graph Refer to graph Volts kΩ Volts mA °C °C 5.25 30 +70 +150 VCC =5V; no interface selected RS422 RECEIVER +3.25mA RS423 RECEIVER +3.25mA –10V –3V +3V +10V –10V –3V +3V +10V Maximum Input Current versus Voltage –3.25mA –3.25mA Maximum Input Current versus Voltage RS485 RECEIVER +1.0mA –7V –3V +6V +12V –0.6mA 1 Unit Load Maximum Input Current versus Voltage Rev. 7/21/03 SP502 Multi-Mode Serial Transceiver © Copyright 2003 Sipex Corporation 4 AC CHARACTERISTICS PARAMETER SINGLE–ENDED MODE RS-232 Driver Propagation Delay tPHL tPLH tPHL tPLH Receiver Propagation Delay tPHL tPLH RS-423 Driver Propagation Delay tPHL tPLH Receiver Propagation Delay tPHL tPLH DIFFERENTIAL MODE RS-485 Driver Propagation Delay tPHL tPLH Receiver Propagation Delay tPHL tPLH RS-422 Driver Propagation Delay tPHL tPLH Receiver Propagation Delay tPHL tPLH V.35 Driver Propagation Delay tPHL tPLH Receiver Propagation Delay tPHL tPLH 200 200 1.0 1.0 µs µs Input = 0.8V to 2.0V; 60kHz Loaded with 450Ω Loaded with 450Ω Input = -0.2V to 2.0V; ; 60kHz; Note 2 MIN. TYP. MAX. UNITS CONDITIONS 1.7 1.1 2.0 2.0 8.0 8.0 µs µs µs µs Input = 0.8V to 2.0V; 60kHz Unloaded Unloaded Loaded with 3kΩ and 2,500pF Loaded with 3kΩ and 2,500pF Input = 0V to 5.0V; 60kHz; Note 1 2.0 2.0 8.0 8.0 1.0 1.0 µs µs µs µs 200 200 ns ns Input = 0V to 3.0V; 100kHz Note 3 Loaded with 54Ω Loaded with 54Ω Input = a to GND; B = -200mV to +200mV; 100kHz, Note 4 200 200 ns ns Input = 0V to 3.0V; 100kHz Note 3 Loaded with 100Ω Loaded with 100Ω Input = a to GND; B = -200mV to +200mV; 100kHz, Note 4 200 200 ns ns ns ns Input = 0V to 3.0V; 100kHz Note 3 Loaded with 100Ω Loaded with 100Ω Input = a to GND; B = -200mV to +200mV; 100kHz, Note 4 ns ns 200 200 ns ns Rev. 7/21/03 SP502 Multi-Mode Serial Transceiver © Copyright 2003 Sipex Corporation 5 OTHER AC CHARACTERISTICS (continued) PARAMETER MIN. TYP. MAX. DELAY TIME FROM ENABLE MODE TO TRI–STATE MODE RS-232 (SINGLE–ENDED MODE) tPZL; Enable to Output LOW 190 tPZH; Enable to Output HIGH 130 tPLZ; Disable from Output LOW 270 tPHZ; Disable from Output HIGH 400 RS-422 (DIFFERENTIAL MODE) tPZL; Enable to Output LOW 100 tPZH; Enable to Output HIGH 100 tPLZ; Disable from Output LOW 130 tPHZ; Disable from Output HIGH 140 Notes: 1. Measured from 2.5V of RIN to 2.5V of ROUT. 2. Measured from one–half of RIN to 2.5V of ROUT. 3. Measured from 1.5V of TIN to one–half of TOUT. 4. Measured from 2.5V of RO to 0V of A and B. UNITS CONDITIONS ns ns ns ns ns ns ns ns 3kΩ pull–up to output 3kΩ pull–down to output 5V to input GND to input 3kΩ pull–up to output 3kΩ pull–down to output 5V to input GND to input POWER MATRIX ; r Mode Open Input Input to 5V Input to GND AC Signal 5V to Input GND to Input to Input with Load with Load 20.71mA 21.5mA 20.74mA 28.32mA 58.19mA 55.64mA AC Signal with Load 73.08mA Conditions V.35 1110 With external driver output termination network; Input = 0.8V to 2V, 60kHz; Load = 3kΩ, 2500pF for RS-232; load = 100Ω for V.35 Input = 0.8V to 2V, 60kHz ; Load = 3kΩ, 2500pF Input = 0.8V to 2V, 2.5MHz; Load = 100Ω Input 0.8V to 2V, 2.5MHz; Load = 54Ω Input = 0.8V to 2V, 60kHz; Load = 450Ω for RS-423; Load = 100Ω for RS-422 Input = 0.8V to 2V, 60kHz; Load = 450Ω for RS-423; Load = 100Ω for RS-422 RS-232 0010 RS-422 0100 RS-485 0101 RS-449 1100 22.53mA 22.41mA 23.15mA 31.54mA 43.74mA 40.96mA 62.47mA 17.93mA 17.83mA 14.13mA 32.92mA 143.47mA 140.65mA 146.55mA 17.82mA 17.74mA 14.07mA 32.85mA 182.93mA 180.71mA 183.65mA 19.93mA 19.87mA 17.84mA 23.57mA 134.90mA 131.35mA 131.94mA EIA-530 1101 19.85mA 19.83mA 17.82mA 23.54mA 134.90mA 131.25mA 131.78mA *All Driver Input Common VCC=5V Rev. 7/21/03 SP502 Multi-Mode Serial Transceiver © Copyright 2003 Sipex Corporation 6 PINOUT… 69 DM(b) 68 DM(a) 71 RD(b) 70 RD(a) 67 CS(b) 66 CS(a) 61 SD(a) 65 TT(b) 63 TT(a) 75 GND 72 GND 64 GND 78 DSR 80 CTS 74 VCC 73 VCC 62 VCC 79 RxT 77 NC 76 NC Pin 70 — RD(a) — Receive Data, analog input; inverted; source for RxD. Pin 71 — RD(b) — Receive Data; analog input; non-inverted; source for RxD. 60 GND 59 SD(b) 58 TR(a) 57 GND 56 TR(b) 55 VCC 54 RS(a) 53 GND RxD 1 RDEC0 2 RDEC1 3 RDEC2 4 RDEC3 5 ST/TT 6 GND 7 VCC 8 TDEC3 9 TDEC2 10 TDEC1 11 TDEC0 12 DTR 13 TxD 14 TxC 15 RTS 16 RL 17 NC 18 DCD 19 RxC 20 SP502 52 RS(b) 51 LL(a) 50 GND 49 LL(b) 48 VCC 47 RL(a) 46 GND 45 RL(b) 44 ST(b) 43 GND 42 ST(a) 41 VCC Note: NC (No Connection) pins should be left floating. Internal signals may be present. PIN ASSIGNMENTS… CLOCK AND DATA GROUP Pin 1 — RxD — Receive Data; TTL output, sourced from RD(a) and RD(b) inputs. Pin 14 — TxD — TTL input ; transmit data source for SD(a) and SD(b) outputs. Pin 15 — TxC — Transmit Clock; common TTL input for both ST and TT driver outputs. Pin 20 — RxC — Receive Clock; TTL output sourced from RT(a) and RT(b) inputs. Pin 37 — RT(a) — Receive Timing; analog input, inverted; source for RxC. Pin 38 — RT(b) — Receive Timing; analog input, non-inverted; source for RxC. Pin 42 — ST(a) — Send Timing; analog output, inverted; sourced from ST. Pin 44 — ST(b) — Send Timing; analog output, non-inverted; sourced from ST. Pin 59 — SD(b) — Analog Out — Send data, non-inverted; sourced from TxD. Pin 61 — SD(a) — Analog Out — Send data, inverted; sourced from TxD. Pin 63 — TT(a) — Analog In or Out — Terminal Timing, inverted; sourced to TxC or RxT. Pin 65 — TT(b) — Analog In or Out — Terminal Timing, non–inverted; sourced to TxC or RxT. CONTROL LINE GROUP Pin 13 — DTR — Data Terminal Ready; TTL input; source for TR(a) and TR(b) outputs. Pin 16 — RTS — Ready To Send; TTL input; source for RS(a) and RS(b) outputs. Pin 17 — RL — Remote Loopback; TTL input; source for RL(a) and RL(b) outputs. Pin 19 — DCD— Data Carrier Detect; TTL output; sourced from RR(a) and RR(b) inputs. Pin 21 — RI — Ring In; TTL output; sourced from IC(a) and IC(b) inputs. Pin 24 — LL — Local Loopback; TTL input; source for LL(a) and LL(b) outputs. Pin 35 — RR(a)— Receiver Ready; analog input, inverted; source for DCD. Pin 36 — RR(b)— Receiver Ready; analog input, non-inverted; source for DCD. Pin 39 — IC(a)— Incoming Call; analog input, inverted; source for RI. Pin 40 — IC(b)— Incoming Call; analog input, non-inverted; source for RI. Pin 45 — RL(b) — Remote Loopback; analog output, non-inverted; sourced from RL. Pin 47 — RL(a) — Remote Loopback; analog output inverted; sourced from RL. Pin 49— LL(b) — Local Loopback; analog output, non-inverted; sourced from LL. Pin 51 — LL(a) — Local Loopback; analog output, inverted; sourced from LL. Pin 52 — RS(b) — Ready To Send; analog output, non-inverted; sourced from RTS. Pin 54 — RS(a) — Ready To Send; analog output, inverted; sourced from RTS. Pin 56 — TR(b) — Terminal Ready; analog output, non-inverted; sourced from DTR. Pin 58 — TR(a) — Terminal Ready; analog output, inverted; sourced from DTR. Pin 66 — CS(a)— Clear To Send; analog input, inverted; source for CTS. Pin 67 — CS(b)— Clear To Send; analog input, non-inverted; source for CTS. Pin 68 — DM(a)— Data Mode; analog input, inverted; source for DSR. Pin 69 — DM(b)— Data Mode; analog input, non-inverted; source for DSR. RT(a) 37 RT(b) 38 IC(a) 39 RR(a) 35 Rev. 7/21/03 RR(b) 36 GND 29 C1– 30 C2– 31 GND 34 IC(b) 40 VCC 25 C1+ 26 VDD 27 C2+ 28 VCC 33 VSS 32 RI 21 NC 22 NC 23 LL 24 SP502 Multi-Mode Serial Transceiver © Copyright 2003 Sipex Corporation 7 Pin 78 — DSR— Data Set Ready; TTL output; sourced from DM(a), DM(b) inputs. Pin 80 — CTS— Clear To Send; TTL output; sourced from CS(a) and CS(b) inputs. CONTROL REGISTERS Pins 2–5 — RDEC0 – RDEC3 — Receiver decode register; configures receiver modes; TTL inputs. Pin 6 — ST/TT — Enables ST or TT drivers, TTL input. Pins 12–9 — TDEC0 – TDEC3 — Transmitter decode register; configures transmitter modes; TTL inputs. POWER SUPPLIES Pins 8, 25, 33, 41, 48, 55, 62, 73, 74 — VCC — +5V input. Pins 7, 29, 34, 43, 46, 50, 53, 57, 60, 64, 72, 75 — GND — Ground. Pin 27 — VDD +10V Charge Pump Capacitor — Connects from VDD to VCC. Suggested capacitor size is 22µF, 16V. Pin 32 — VSS –10V Charge Pump Capacitor — Connects from ground to VSS. Suggested capacitor size is 22µF, 16V. Pins 26 and 30 — C1+ and C1– — Charge Pump Capacitor — Connects from C1+ to C1–. Suggested capacitor size is 22µF, 16V. Pins 28 and 31 — C2+ and C2– — Charge Pump Capacitor — Connects from C2+ to C2–. Suggested capacitor size is 22µF, 16V. NOTE: NC pins should be left floating; internal signals may be present. device is packaged in an 80–pin Quad FlatPack package. The SP502 is ideally suited for wide area network connectivity based on the interface modes offered and the driver and receiver configurations. The SP502 has five (5) independent drivers and six (6) independent receivers and one half–duplex transceiver channel, which allows a maximum of six (6) drivers and seven (7) receivers. The driver and receiver configuration for the SP502 is ideal for DTE applications. The SP502 is made up of four separate circuit blocks – the charge pump, drivers, receivers, and decoder. Each of these circuit blocks is described in detail below. THEORY OF OPERATION 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 on 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 C3. Simultaneously, the positive side of capaci- FEATURES… The SP502 is a highly integrated serial transceiver that allows software control of its interface modes. The SP502 offers hardware interface modes for RS-232 (V.28), RS-422A (V.11), RS-449, RS-485, V.35, and EIA-530. The interface mode selection is done via an 8–bit switch; four (4) bits control the drivers and four (4) bits control the receivers. The SP502 is fabricated using low–power BiCMOS process technology, and incorporates a Sipex patented (5,306,954) charge pump allowing +5V only operation. Each Rev. 7/21/03 SP502 Multi-Mode Serial Transceiver © Copyright 2003 Sipex Corporation 8 VCC = +5V VCC = +5V +5V C1 + – C4 + – + C4 VDD Storage Capacitor C1 VSS Storage Capacitor + + – – + C2 + – – C2 + – – VDD Storage Capacitor VSS Storage Capacitor –5V –5V C3 –10V C3 Figure 1. Charge Pump Phase 1. Figure 2. Charge Pump Phase 2. tor 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. 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 ap- proaches 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 must be 22µF with a 16V breakdown rating. Two external Schottky diodes connected as in Figure 6 are required for high rate of rise power supplies. External Power Supplies For applications that do not require +5V only, external supplies can be applied at the V+ and V– pins. The value of the external supply voltages must be no greater than ±l0V. The current drain for the ±10V supplies is used for RS-232, and RS-423 drivers. For the RS-232 driver the current requirement will be 3.5mA per driver, and for the RS-423 driver the worst case current drain will be 11mA per driver. The external +10V C2 + a) GND GND C2– –10V b) Figure 3. Charge Pump Waveforms Rev. 7/21/03 SP502 Multi-Mode Serial Transceiver © Copyright 2003 Sipex Corporation 9 VCC = +5V VCC = +5V +5V C1 + – C4 + – + C2 + – – VDD Storage Capacitor VSS Storage Capacitor +10V C1 + – C4 + – + –5V –5V C3 C2 + – – VDD Storage Capacitor VSS Storage Capacitor C3 Figure 4. Charge Pump Phase 3. Figure 5. Charge Pump Phase 4. power supplies should provide a power supply sequence of: +l0V, then +5V, followed by –l0V. Drivers The SP502 has six (6) drivers which can be programmed in six different modes of operation. One of the drivers for the SP502 is internally connected to an internal receiver input to make up a half-duplex configuration. As shown in the Mode Diagrams, the driver input of the half-duplex channel is shared with an adjacent driver such that when one is active the other is disabled. Control for the mode selection is done via a four–bit control word. The SP502 does not have a latch; the control word must be externally latched either high or low to write the appropriate code into the SP502. The drivers are prePin Label TDEC3–TDEC0 SD(a) SD(b) TR(a) TR(b) RS(a) RS(b) RL(a) RL(b) LL(a) LL(b) ST(a) ST(b) TT(a) TT(b) Mode: 0000 tri–state tri–state tri–state tri–state tri–state tri–state tri–state tri–state tri–state tri–state tri–state tri–state tri–state tri–state RS-232 0010 RS-232 tri–state RS-232 tri–state RS-232 tri–state RS-232 tri–state RS-232 tri–state RS-232 tri–state RS-232 tri–state V.35 1110 V.35– V.35+ RS-232 tri–state RS-232 tri–state RS-232 tri–state RS-232 tri–state V.35– V.35+ V.35– V.35+ arranged such that for each mode of operation the relative position and functionality of the drivers are set up to accommodate the selected interface mode. As the mode of the drivers is changed, the electrical characteristics will change to support the requirements of clock, data, and control line signal levels. Table 1 shows a summary of the electrical characteristics of the drivers in the different interface modes. Unused driver inputs can be left floating; however, to ensure a desired state with no input signal, pull– up resistors to +5V or pull–down resistors to ground are suggested. Since the driver inputs are both TTL or CMOS compatible, any value resistor less than 100kΩ will suffice. There are three basic types of driver circuits — RS-232, RS-423, and RS-485. The RS-232 drivers output a minimum of ±5V level single–ended signals (with 3kΩ and 2500pF loading), and RS-422 0100 RS-422– RS-422+ RS-422– RS-422+ RS-422– RS-422+ RS-422– RS-422+ RS-422– RS-422+ RS-422– RS-422+ RS-422– RS-422+ RS-485 0101 RS-485– RS-485+ RS-485– RS-485+ RS-485– RS-485+ RS-485– RS-485+ RS-485– RS-485+ RS-485– RS-485+ RS-485– RS-485+ RS-449 1100 RS-422– RS-422+ RS-422– RS-422+ RS-422– RS-422+ RS-423 tri–state RS-423 tri–state RS-422– RS-422+ RS-422– RS-422+ EIA-530 1101 RS-422– RS-422+ RS-422– RS-422+ RS-422– RS-422+ RS-423 tri–state RS-423 tri–state RS-422– RS-422+ RS-422– RS-422+ *The ST and TT driver outputs cannot be enabled simultaneously. Table 1. SP502 Drivers Rev. 7/21/03 SP502 Multi-Mode Serial Transceiver © Copyright 2003 Sipex Corporation 10 +5V, ±5% 1N5819 D2 + D1 and D2 are Schottky diodes. They are necessary to guard against VCC rates of rise greater than 1V/µs, which can cause start–up problems. 22µF (VCC decoupling) All VCC connections can be tied + 25 196Ω 422Ω 422Ω 27 26 22µF, 16V 'together. Charge pump capacitors must be placed as close to the package as possible. VDD C1+ VCC 22µF + 16V 30 28 22µF + 16V 1N5819 + C1– Charge Pump C2+ C2– VSS GND 422Ω 196Ω V.35 External Driver Output Termination Resistors 422Ω 422Ω 196Ω 31 D1 32 422Ω 196Ω 22µF, 16V SP502 1 1 V.35 MODE Control Word 47Ω 120Ω 1 0 Driver Decode 47Ω V.35 External Receiver Input Termination Resistors 47Ω Ext. Latch 47Ω 120Ω 1 1 1 0 Receiver Decode For NET2 certified circuits, please contact the factory. Figure 6. Typical Operating Circuit Rev. 7/21/03 SP502 Multi-Mode Serial Transceiver © Copyright 2003 Sipex Corporation 11 can operate up to 120kbps. The RS-232 drivers are used in RS-232 mode for all signals, and also in V.35 mode where they are used as the control line signals. The RS-423 drivers output a minimum of ±3.6V level single–ended signals (with 450Ω loading) and can operate up to 120kbps. Open circuit VOL and VOH measurements may exceed the ±6V limitation of RS-423. The RS-423 drivers are used in RS-449 and EIA-530 modes as RL and LL outputs. The third type of driver supports RS-485, which is a differential signal that can maintain ±1.5V differential output levels with a worst case load of 54Ω. The signal levels and drive capability of the RS-485 drivers allow the drivers to also support RS-422 requirements of ±2V differential output levels with 100Ω loads. The RS-422 drivers are used in RS-449 and EIA-530 modes as clock, data, and some control line signals. The RS-485–type drivers are also used in the V.35 mode. V.35 levels require ±0.55V signals with a load of 100Ω. In order to meet the voltage requirements of V.35, external series resistors with source impedance termination resistors must be implemented to voltage divide the driver outputs from 0 to +5V to 0 to +0.55V. Figure 6 shows the values of the resistor network and how to connect them. The termination network also achieves the 50Ω to 150Ω source impedPin Label RDEC3–RDEC0 RD(a) RD(b) RT(a) RT(b) CS(a) CS(b) DM(a) DM(b) RR(a) RR(b) IC(a) IC(b) SCT(a) SCT(b) Mode: 0000 Undefined Undefined Undefined Undefined Undefined Undefined Undefined Undefined Undefined Undefined Undefined Undefined Undefined Undefined RS-232 0010 RS-232 15kΩ to GND RS-232 15kΩ to GND RS-232 15kΩ to GND RS-232 15kΩ to GND RS-232 15kΩ to GND RS-232 15kΩ to GND RS-232 15kΩ to GND V.35 1110 V.35– V.35+ V.35– V.35+ RS-232 15kΩ to GND RS-232 15kΩ to GND RS-232 15kΩ to GND RS-232 15kΩ to GND V.35– V.35+ ance for V.35. For applications that require V.11 signals for clock and data instead of V.35 levels, omit the external termination networks. All of the differential drivers, RS-485, RS-422, and V.35 can operate up to 5Mbps. Receivers The SP502 is equipped with seven (7) receivers which can be programmed in six (6) different modes of operation. One of the seven (7) receivers (RxT) is part of a half-duplex channel, which means its inputs are shared with a driver output, as shown in the Mode Diagrams. The RxT receiver has its inputs internally connected to the TT(a) and TT(b) pins. The select pin labeled ST/TT enables either the TT-driver or the ST-driver, but it does not disable the receiver. The RxT receiver is always connected to the TT(a) and TT(b) pins. Any signal that is received or transmitted on TT(a) and TT(b) will trigger a TTL-output at the RxT pin. Control for the mode selection is done via a 4– bit control word that is independent from the driver control word. The coding for the drivers and receivers is identical. Therefore, if the modes for the drivers and receivers are supposed to be identical in the application, the control lines can be tied together. Like the drivers, the receivers are pre-arranged for the specific requirements of the interface. As the operating mode of the receivers is changed, RS-422 0100 RS-422– RS-422+ RS-422– RS-422+ RS-422– RS-422+ RS-422– RS-422+ RS-422– RS-422+ RS-422– RS-422+ RS-422– RS-422+ RS-485 0101 RS-485– RS-485+ RS-485– RS-485+ RS-485– RS-485+ RS-485– RS-485+ RS-485– RS-485+ RS-485– RS-485+ RS-485– RS-485+ RS-449 1100 RS-422– RS-422+ RS-422– RS-422+ RS-422– RS-422+ RS-422– RS-422+ RS-422– RS-422+ RS-423 15kΩ to GND RS-422– RS-422+ EIA-530 1101 RS-422– RS-422+ RS-422– RS-422+ RS-422– RS-422+ RS-422– RS-422+ RS-422– RS-422+ RS-423 15kΩ to GND RS-422– RS-422+ *TT(a) and TT(b) can be programmed as driver outputs or receiver inputs. Table 2. SP502 Receivers Rev. 7/21/03 SP502 Multi-Mode Serial Transceiver © Copyright 2003 Sipex Corporation 12 the electrical characteristics will change to support the requirements of clock, data, and control line receivers. Table 2 shows a summary of the electrical characteristics of the receivers in the different interface modes. Unused receiver inputs can be left floating without causing oscillation. To ensure a desired state of the receiver output, a pull–up resistor of 100kΩ to +5V should be connected to the inverting input for a logic LOW, or the non–inverting input for a logic high. For single-ended receivers, a pull– down resistor to ground of 5kΩ is internally connected, which will ensure a logic HIGH output. There are three basic types of receivers — RS-232, RS-423, and RS-485. The RS-232 receiver is a single–ended input with a threshold of 0.8V to 2.4V. The RS-232 receiver has an operating voltage range of ±15V and can receive signals up to 120kbps. RS-232 receivers are used in RS-232 mode for all signal types, and in V.35 mode for control line signals. The RS-423 receivers are also single–ended but have an input threshold as low as ±200mV. The input impedance is guaranteed to be greater than 4kΩ, with an operating voltage range of ±7V. The RS-423 receivers can operate up to 120kbps. RS-423 receivers are used for the IC signal in RS-449 and EIA-530 modes, as shown in Table 2. The third type of receiver supports RS-485, which is a differential interface mode. The RS-485 receiver has an input impedance of 15kΩ and a differential threshold of ±200mV. Since the characteristics of an RS-422 receiver are actually subsets of RS-485, the receivers for RS-422 requirements are identical to the RS-485 receivers. RS-422 receivers are used in RS-449 and EIA-530 for receiving clock, data, and some control line signals. The RS-485 receivers are also used for the V.35 mode. V.35 levels require the ±0.55V signals with a load of 100Ω. In order to meet the V.35 input impedance of 100Ω, the external termination network of Figure 6 must be applied. The threshold of the V.35 receiver is ±200mV. The V.35 receivers can operate up to 5Mbps. All of the differential receivers can receive data up to 5Mbps. Decoder The SP502 has the ability to change the interface mode of the drivers or receivers via an 8–bit switch. The decoder for the drivers and receivers is not latched; it is merely a combinational logic switch. The codes shown in Tables 1 and 2 are the only specified, valid modes for the SP502. Undefined codes may represent other interface modes not specified or random outputs (consult the factory for more information). The drivers are controlled with the data bits labeled TDEC3–TDEC0. The drivers can be put into tri-state mode by writing 0000 to the driver decode switch. The receivers are controlled with data bits RDEC3–RDEC0; the code 0000 written to the receivers will place the outputs in an undetermined state. All receivers, with the exception of SCT, do not have tri-state capability; the outputs will either be HIGH or LOW depending upon the state of the receiver input. Rev. 7/21/03 SP502 Multi-Mode Serial Transceiver © Copyright 2003 Sipex Corporation 13 MODE: RS-232 DRIVER RECEIVER TDEC3 TDEC2 TDEC1 TDEC0 RDEC3 RDEC2 RDEC1 RDEC0 0 0 1 0 0 0 1 0 RD(a) 70 RxD 1 RT(a) 37 RxC 20 CS(a) 66 CTS 80 DM(a) 68 DSR 78 RR(a) 35 DCD 19 IC(a) 39 RI 21 14 TxD 61 SD(a) 13 DTR 58 TR(a) 16 RTS 54 RS(a) 17 RL 47 RL(a) 24 LL 51 LL(a) 15 TxC 42 ST(a) 6 ST/TT 63 TT(a) RxT 79 ST/TT 1 0 ST Enabled Disabled TT Disabled Enabled RxT* Active Inactive * TT driver must be disabled to allow TT(a) and TT(b) to serve as receiver inputs. * When the RxT receiver is active, TT(a) and TT(b) act as receiver inputs. When the RxT receiver is inactive, it cannot serve as a receiver since its inputs are internally connected to the TT(a) and TT(b) driver outputs. Figure 7. Mode Diagram — RS-232 Rev. 7/21/03 SP502 Multi-Mode Serial Transceiver © Copyright 2003 Sipex Corporation 14 MODE: V.35 DRIVER RECEIVER TDEC3 TDEC2 TDEC1 TDEC0 RDEC3 RDEC2 RDEC1 RDEC0 1 1 1 0 1 1 1 0 RD(a) 70 RxD 1 RD(b) 71 RT(a) 37 RxC 20 RT(b) 38 CS(a) 66 CTS 80 DM(a) 68 DSR 78 RR(a) 35 DCD 19 IC(a) 39 RI 21 14 TxD 61 SD(a) 59 SD(b) 13 DTR 58 TR(a) 16 RTS 54 RS(a) 17 RL 47 RL(a) 24 LL 51 LL(a) 15 TxC 42 ST(a) 44 ST(b) 6 ST/TT 63 TT(a) 65 TT(b) RxT 79 ST/TT 1 0 ST Enabled Disabled TT Disabled Enabled RxT* Active Inactive * TT driver must be disabled to allow TT(a) and TT(b) to serve as receiver inputs. * When the RxT receiver is active, TT(a) and TT(b) act as receiver inputs. When the RxT receiver is inactive, it cannot serve as a receiver since its inputs are internally connected to the TT(a) and TT(b) driver outputs. Figure 8. Mode Diagram — V.35 Rev. 7/21/03 SP502 Multi-Mode Serial Transceiver © Copyright 2003 Sipex Corporation 15 MODE: RS-422 DRIVER RECEIVER TDEC3 TDEC2 TDEC1 TDEC0 RDEC3 RDEC2 RDEC1 RDEC0 0 1 0 0 0 1 0 0 RD(a) 70 RxD 1 RD(b) 71 RT(a) 37 RxC 20 RT(b) 38 CS(a) 66 CTS 80 CS(b) 67 DM(a) 68 DSR 78 DM (b) 69 RR(a) 35 DCD 19 RR(b) 36 IC(a) 39 RI 21 IC(b) 40 15 TxC 42 ST(a) 44 ST(b) 6 ST/TT 63 TT(a) 65 TT(b) RxT 79 17 RL 47 RL(a) 45 RL(b) 24 LL 51 LL(a) 49 LL(b) 14 TxD 61 SD(a) 59 SD(b) 13 DTR 58 TR(a) 56 TR(b) 16 RTS 54 RS(a) 52 RS(b) ST/TT 1 0 ST Enabled Disabled TT Disabled Enabled RxT* Active Inactive * TT driver must be disabled to allow TT(a) and TT(b) to serve as receiver inputs. * When the RxT receiver is active, TT(a) and TT(b) act as receiver inputs. When the RxT receiver is inactive, it cannot serve as a receiver since its inputs are internally connected to the TT(a) and TT(b) driver outputs. Figure 9. Mode Diagram — RS-422 Rev. 7/21/03 SP502 Multi-Mode Serial Transceiver © Copyright 2003 Sipex Corporation 16 MODE: RS-449 DRIVER RECEIVER TDEC3 TDEC2 TDEC1 TDEC0 RDEC3 RDEC2 RDEC1 RDEC0 1 1 0 0 1 1 0 0 RD(a) 70 RxD 1 RD(b) 71 RT(a) 37 RxC 20 RT(b) 38 CS(a) 66 CTS 80 CS(b) 67 DM(a) 68 DSR 78 DM (b) 69 RR(a) 35 DCD 19 RR(b) 36 IC(a) 39 RI 21 47 RL(a) 24 LL 51 LL(a) 15 TxC 42 ST(a) 44 ST(b) 6 ST/TT 63 TT(a) 65 TT(b) RxT 79 14 TxD 61 SD(a) 59 SD(b) 13 DTR 58 TR(a) 56 TR(b) 16 RTS 54 RS(a) 52 RS(b) 17 RL ST/TT 1 0 ST Enabled Disabled TT Disabled Enabled RxT* Active Inactive * TT driver must be disabled to allow TT(a) and TT(b) to serve as receiver inputs. * When the RxT receiver is active, TT(a) and TT(b) act as receiver inputs. When the RxT receiver is inactive, it cannot serve as a receiver since its inputs are internally connected to the TT(a) and TT(b) driver outputs. Figure 10. Mode Diagram — RS-449 Rev. 7/21/03 SP502 Multi-Mode Serial Transceiver © Copyright 2003 Sipex Corporation 17 MODE: RS-485 DRIVER RECEIVER TDEC3 TDEC2 TDEC1 TDEC0 RDEC3 RDEC2 RDEC1 RDEC0 0 1 0 1 0 1 0 1 RD(a) 70 RxD 1 RD(b) 71 RT(a) 37 RxC 20 RT(b) 38 CS(a) 66 CTS 80 CS(b) 67 DM(a) 68 DSR 78 DM (b) 69 RR(a) 35 DCD 19 RR(b) 36 IC(a) 39 RI 21 IC(b) 40 15 TxC 42 ST(a) 44 ST(b) 6 ST/TT 63 TT(a) 65 TT(b) RxT 79 17 RL 47 RL(a) 45 RL(b) 24 LL 51 LL(a) 49 LL(b) 14 TxD 61 SD(a) 59 SD(b) 13 DTR 58 TR(a) 56 TR(b) 16 RTS 54 RS(a) 52 RS(b) ST/TT 1 0 ST Enabled Disabled TT Disabled Enabled RxT* Active Inactive * TT driver must be disabled to allow TT(a) and TT(b) to serve as receiver inputs. * When the RxT receiver is active, TT(a) and TT(b) act as receiver inputs. When the RxT receiver is inactive, it cannot serve as a receiver since its inputs are internally connected to the TT(a) and TT(b) driver outputs. Figure 11. Mode Diagram — RS-485 Rev. 7/21/03 SP502 Multi-Mode Serial Transceiver © Copyright 2003 Sipex Corporation 18 MODE: EIA-530 DRIVER RECEIVER TDEC3 TDEC2 TDEC1 TDEC0 RDEC3 RDEC2 RDEC1 RDEC0 1 1 0 1 1 1 0 1 RD(a) 70 RxD 1 RD(b) 71 RT(a) 37 RxC 20 RT(b) 38 CS(a) 66 CTS 80 CS(b) 67 DM(a) 68 DSR 78 DM (b) 69 RR(a) 35 DCD 19 RR(b) 36 IC(a) 39 RI 21 47 RL(a) 24 LL 51 LL(a) 15 TxC 42 ST(a) 44 ST(b) 6 ST/TT 63 TT(a) 65 TT(b) RxT 79 14 TxD 61 SD(a) 59 SD(b) 13 DTR 58 TR(a) 56 TR(b) 16 RTS 54 RS(a) 52 RS(b) 17 RL ST/TT 1 0 ST Enabled Disabled TT Disabled Enabled RxT* Active Inactive * TT driver must be disabled to allow TT(a) and TT(b) to serve as receiver inputs. * When the RxT receiver is active, TT(a) and TT(b) act as receiver inputs. When the RxT receiver is inactive, it cannot serve as a receiver since its inputs are internally connected to the TT(a) and TT(b) driver outputs. Figure 12. Mode Diagram — EIA-530 Rev. 7/21/03 SP502 Multi-Mode Serial Transceiver © Copyright 2003 Sipex Corporation 19 APPLICATION EXAMPLE The example application that follows is a fully configured serial I/O channel in a DTE configuration. The example is comprised of the following functional elements: • Processor • SCC • SP502 • Mode Select Register (R0[WR]) • RL & LL Control Bit Register (R1[WR]) • RI Status Bit Register (R1[RD]) • Address Decode Logic • Baud Rate Clock Source • I/O Connector Interface Each of the elements of the application example are described below. Please refer to Figure13. Processor The example schematic shows a generic 8-bit processor connected to a generic SCC. The processor is also connected to three registers. The registers are described in further detail below. Address Decode Logic The address decode logic is connected to the Processor control and address busses and provides the logic necessary to decode the I/O read and write operations for the SCC, Mode Select Register, RL and LL Control Bit Register and the RI Status Bit Register. SCC The SCC provides the I/O functions for a single serial channel. The SCC is connected to the Processor I/O bus and is programmed by the user software. The SCC’s TTL-level serial I/O pins are connected to the corresponding TTL-level serial I/O pins on the SP502. SP502 The SP502 provides buffering and translation from TTL levels to the selected physical level interface standard, such as RS-232, V.35, etc. The physical level interface pins are connected to a standard 25 pin D-subminiature connector wired in a DTE configuration with the pin assignments corresponding to the EIA-530 specification. This choice was purely arbitrary. However, it provides all the necessary signals to support standards other than EIA-530, such as V.35, RS-232, RS-449, etc. with an appropriate cable adapter. The SP502 driver and receiver modes are independently configured by programming the SP502’s RDEC and TDEC input pins. In the example, the pins are driven by the Mode Select Register with a programmed value stored by the user’s software. Since the SP502 is shown in a DTE configuration, the example assumes that any synchronous interface clocking will be provided by the attached DCE device. Consequently, the ST/TT pin is tied to +5V, thus causing the SP502 to receive the transmit clock on the TT(a) and TT(b) input pins and output the transmit clock to the SCC on the RxT output pin. The receive clock is input to the SP502 on the RT(a) and RT(b) pins and output to the SCC on the RxC pin. Mode Select Register The mode select register is an 8-bit latch attached to the Processor data bus. The Processor, under user-software control, can program the Mode Select Register with the appropriate values to select the SP502’s driver and receiver modes. The table shown on the schematic below the register lists the values for programming the register to drive the RDEC and TDEC pins on the SP502 for the desired physical level interface. The receivers and drivers can be programmed independently, but in this example the Mode Select Register must be programmed with both the RDEC and TDEC values at the same time. This is because the RDEC and TDEC pins are driven from the same 8-bit latch. Note that selecting modes for TDEC that are shown in the table as undefined will result in the drivers operating in an undefined mode and should not be used. Likewise, selecting modes for RDEC that are shown in the table as undefined will result in indeterminate logic levels present on the TTL outputs of the SP502. Undefined RDEC or TDEC values should never be programmed. Rev. 7/21/03 SP502 Multi-Mode Serial Transceiver © Copyright 2003 Sipex Corporation 20 +5V 22µF 16V VSS 32 C2- 31 C2+ 28 C1+ 26 C1- 30 VDD 27 VCC 8,25,33,41, D7 D6 D5 D4 D3 D2 D1 D0 22µF 16V + D7 D6 D5 D4 D3 D2 D1 D0 48,55,62, 73,74 Processor Latch INT/ RESET CLK SP502 Figure 13. DTE Serial Communications Channel + 22µF 16V 22µF 16V Processor Address Bus RD/ WT/ D D Q/ Q/ D1 D0 A3 A2 A1 A0 D0 Tri-State Buffer SCC Rev. 7/21/03 + + + 22µF 16V Bypass 1N5819 1N5819 Processor Data Bus N D7 D6 D5 D4 D3 D2 D1 D0 TxD RxD RTS CTS DS DT DCD TxC RxC 14 1 16 80 78 13 19 15 20 79 21 24 17 TxD RxD RTS CTS DSR DTR DCD TxC RxC RxT RI LL RL 25 Pin D-Sub Connector In DTE Config. 2 14 3 16 4 19 5 13 6 22 20 23 8 10 25 BA(A) BA(B) BB(A) BB(B) CA(A) CA(B) CB(A) CB(B) CC(A) CC(B) CD(A) CD(B) CF(A) CF(B) TM R1 R1 [RD] R1 [WR] R0 [WR] D7 D6 D5 D4 D3 D2 D1 D0 Latch Address Decode Logic SP502 Multi-Mode Serial Transceiver 21 D D D D D D D D CLK 7 6 5 4 3 2 N 18 LL RD/ WT/ CS/ INT/ RESET BAUDCL Q Q Q Q Q Q Q Q N 21 RL +5V 1 0 9 10 11 12 5 4 3 2 6 TDEC3 TDEC2 TDEC1 TDEC0 RDEC3 RDEC2 RDEC1 RDEC0 ST-TT/ SD(a SD(b RD(a RD(b RS(a RS(b CS(a CS(b DM(a) DM(b) TR(a TR(b RR(a RR(b IC(a) IC(b) LL(a) LL(b) RL(a) RL(b) ST(a) ST(b) TT(a) TT(b) RT(a RT(b 61 59 70 71 54 52 66 67 68 69 58 56 35 36 39 40 51 49 47 45 42 44 63 65 37 38 GND 7,29,34,43,46, 50,53,57,60, 64,72,75 N 24 11 15 12 17 9 7 1 DA(A) DA(B) DB(A) DB(B) DD(A) DD(B) AB Baud Rate Clock Source Mode Select Register TDEC R0 [WR] 321 RDEC 0 3 2 1 0 © Copyright 2003 Sipex Corporation Driver Mode Select 0000 – Tri-Stated 0001 – Undefined 0010 – RS-232 0011 – Undefined 0100 – RS-422 0101 – RS-485 0110 – Undefined 0111 – Undefined 1000 – Undefined 1001 – Undefined 1010 – Undefined 1011 – Undefined 1100 – RS-449 1101 – EIA-530 1110 – V.35 1111 – Undefined Receiver Mode Select 0000 – Undefined 0001 – Undefined 0010 – RS-232 0011 – Undefined 0100 – RS-422 0101 – RS-485 0110 – Undefined 0111 – Undefined 1000 – Undefined 1001 – Undefined 1010 – Undefined 1011 – Undefined 1100 – RS-449 1101 – EIA-530 1110 – V.35 1111 – Undefined Several other approaches for driving the RDEC and TDEC signals are possible. One approach would use two independent 4-bit latches, one each to drive the RDEC and TDEC pins as separate groups. Another approach would use one 4-bit latch, each output of the latch would drive a corresponding pair of RDEC/TDEC signals. For instance, RDEC0 and TDEC0 could be tied together and be driven by the low order bit of the 4-bit latch. RL & LL Control Bit Registers A 2-bit latch is used to allow the Processor to program the states of the RL and LL interface signals. This latch is necessary since most SCCs do not support RL and LL control signals. RI Status Bit Register A 1-bit read register is implemented using a tri-state buffer. This will allow the Processor to read the state of the RI (Ring Indicator) interface signal. This is necessary since most SCCs do not support the RI interface signal. The example interface shows the SP502A’s IC(a) input tied to the EIA-530 signal TM (Test Mode). EIA530 does not specify an RI signal. If EIA-530 operation is required, the RI Status Bit Register could be used to monitor the condition of the TM signal or it could be ignored. For other interface standards, the connector pin 25 on the schematic could be tied to the RI signal through a cable adapter arrangement. For instance, if RS-232 operation is used, pin 25 of the connector could be tied to pin 22 of the RS-232 adapter (circuit CE) and the RI Status Bit Register then used to monitor the RS-232 signal for ring indicator. Baud Rate Clock Source Most SCCs require an external clock source for operation in asynchronous and self-clocking applications. I/O Connector Interface The I/O connector is wired to the SP502A such that the interface represents a DTE device. As shown, the connector is wired in an EIA-530 configuration with EIA-530 signal mnemonics. A 25-pin connector wired to the EIA-530 specification provides pins for all interface signals supported by the SP502. If the SP502 is programmed for other physical interfaces, such as V.35, then an adapter cable will provide the necessary conversion from the EIA-530 pin-outs to those required by the V.35 standard together with its ISO-2593 connector. Notes Regarding V.35 Operation The user will have to provide additional resistor networks if correct V.35 signal levels and termination impedances are required. This is necessary because the SP502 does not provide V.35 signal terminations when programmed for V.35 operation. Two approaches are possible. First, if the SP502 is permanently programmed to operate as V.35 only, with no other interface standard required, then the appropriate resistors can be mounted on the PCB near the SP502. Second, if the SP502 will be programmed for a variety of standards, then a better approach might be to provide the resistors as part of the cable adapter assembly used to convert from the standard EIA-530 connector pin-outs shown in the example to the V.35/ISO-2593 connector and pin-outs. Rev. 7/21/03 SP502 Multi-Mode Serial Transceiver © Copyright 2003 Sipex Corporation 22 SP502/SP503 EVALUATION BOARD The SP502/SP503 Evaluation Board (EB) Is designed to offer as much flexibility to the user as possible. Each board comes equipped with an 80-pin QFP Zero-Insertion Force socket to allow for testing of multiple devices. The control lines and inputs and outputs of the device can be controlled either manually or via a data bus under software control. There is a 50-pin connector to allow for easy connection to an existing system via ribbon cable. There are also open areas on the PC board to add additional circuitry to support application-specific requirements. Manual Control The SP502/SP503EB will support both the SP502 or SP503 multi-mode serial transceivers. When used for the SP502, disregard all notation on the board that is in [brackets] . The SP502 has a half-duplex connection between the RxT receiver and the TT driver. Due to this internal connection, the RxT receiver inputs can be accessed via the TT(a) and TT(b) pins. If the user needs separate receiver input test pins, jumpers JP1 and JP2 can be inserted to allow for separate receiver inputs located at SCT(a) and SCT(b). The corresponding TTL output for this receiver is labeled as SCT. This test point is tied to pin 79 of the SP502 or SP503. Pin 7 of the evaluation board is connected to the DIP switch, and is labeled as (SCTEN). When used with the SP502, this pin should be switched to a low state. When the evaluation board is used with the SP503, pin 7 is a tri-state control pin for the SCT receiver. The transceiver I/O lines are brought out to test pins arranged in the same configuration as shown elsewhere in this data sheet. A top layer silk-screen shows the drivers and receivers to allow direct correlation to the data sheet. The transmitter and receiver decode bits are tied together and are brought out to a DIP switch for manual control of both the driver and receiver interface modes. Since the coding for the drivers and receivers is identical, the bits have been tied together. The DIP switch has 7 positions, four of which are reserved for the TDEC/RDEC control. The other three are used as tri-state control pins. The labels that are in [brackets] apply only to the SP503. If a logic one is asserted, the corresponding red LED will be lit. If a zero is asserted, the corresponding red LED will not be lit. Software Control A 50-pin connector brings all the analog and digital I/O lines, VCC, and GND to the edge of the card. This can be wired to the user’s existing design via ribbon cable. The pinout for the connector is described in the following section. When the evaluation board is operated under software control, the DlP switch should be set up so that all bits are LOW (all LEDs off). This will tie pull-down resistors from the inputs to ground and let the external system control the state of the control inputs. Power and Ground Requirements The evaluation board layout has been optimized for performance by using basic analog circuit techniques, The four charge-pump capacitors must be 22µF (16V) and be placed as close to the unit as possible; tantalum capacitors are suggested. The decoupling capacitor must be a minimum of 1µF; depending upon the operating environment, 10µF should be enough for worst case situations. The ground plane for the part must be solid, extending completely under the package. The power supplies for the device should be as accurate as possible; for rated performance ±5% is necessary. The power supply current will vary depending upon the selected mode, the amount of loading and the data rate. As a maximum, the user should reserve 200mA for ICC. The worst-case operating mode is RS-485 under full load of six (6) drivers supplying 1.6V to 54Ω loads. The power and ground inputs can be supplied through either the banana jacks on the evaluation board (Red = VCC = +5V±5%; Black = GND) or through the connector. For reference, the 80-pin QFP Socket is a TESCO part number FPQ-80-65-09A. The 50-pin connector is an AMP part number 749075-5. Rev. 7/21/03 SP502 Multi-Mode Serial Transceiver © Copyright 2003 Sipex Corporation 23 Figure 13. SP502/503 Evaluation Board Schematic Rev. 7/21/03 SP502 Multi-Mode Serial Transceiver © Copyright 2003 Sipex Corporation 24 Figure 14a. Evaluation Board — Top Layers Rev. 7/21/03 SP502 Multi-Mode Serial Transceiver © Copyright 2003 Sipex Corporation 25 Figure 14b. Evaluation Board — Bottom Layers Rev. 7/21/03 SP502 Multi-Mode Serial Transceiver © Copyright 2003 Sipex Corporation 26 Figure 15. External Transient Suppressors Rev. 7/21/03 SP502 Multi-Mode Serial Transceiver © Copyright 2003 Sipex Corporation 27 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 EDGE CONNECTOR 01 DUT PIN DESCRIPTIONS EDGE CONNECTOR 13 14 l5 16 17 18 DUT PIN DESCRIPTIONS TxD (pin 14) –TTL Input – Transmit data; source for SD(a) and SD(b) outputs. DTR (pin 13) – TTL Input – Data terminal ready: source for TR(a) and TR(b) outputs. ST/TT (pin 6) –TTL Input – ST/TT select pin; enables ST drivers and disables TT drivers when high. Disables ST drivers and enables TT drivers when low. DEC3/RDEC3 (pin 5) – TTL Input – Transmitter/Receiver decode register. TDEC2/RDEC2 (pin 4) – TTL Input – Transmitter/Receiver decode register. TDEC1/RDEC1 (pin 3) – TTL Input – Transmitter/Receiver decode register. TDEC0/RDEC0 (pin 2) – TTL Input – Transmitter/Receiver decode register. RxD (pin 1 ) – TTL Output – Receive data; sourced from RD(a) and RD)b) inputs. CTS (pin 80) – TTL Output – Clear to send; sourced from CS(a) and CS(b) inputs. RxT (pin 79) – TTL Output – RxT; sourced from TT(a), TT(b) inputs. DSR (pin 78) – TTL Output – Data set ready; sourced from DM(a) and DM(b) inputs. RD(b) (pin 71) – Analog In – Receive data, non–inverted; source for RxD. RD(a) (pin 70) – Analog In – Receive data, inverted: source for RxD. DM(b) (pin 69) – Analog In – Data mode, non–inverted; source for DSR. DM(a) (pin 68) – Analog In – Data mode, inverted; source for DSR. CS(b) (pin 67) – Analog In – Clear to send; non–inverted; source for CTS. CS(a) (pin 66) – Analog In – Clear to send, inverted; source for CTS. TT(b) (pin 65) – Analog Out – Terminal timing, non–inverted: sourced from TxC input. TT(a) (pin 63) – Analog Out – Terminal timing; inverted: sourced from TxC input. TR(a) (pin 58) – Analog Out – Terminal ready, inverted; sourced from DTR. TR(b) (pin 56) – Analog Out – Terminal ready; non–inverted; sourced from DTR. SD(a) (pin 61) – Analog Out – Send data, inverted; sourced from TxD. SD(b) (pin 59) – Analog Out – Send data; non–inverted; sourced from TxD. RS(a) (pin 54) – Analog Out – Ready to send; inverted; sourced from RTS. RS(b) (pin 52) – Analog Out – Ready to send, non–inverted; sourced from RTS. 02 03 04 05 06 07 08 19 20 21 09 22 23 24 25 10 11 12 Rev. 7/21/03 SP502 Multi-Mode Serial Transceiver © Copyright 2003 Sipex Corporation 28 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 EDGE CONNECTOR 26 DUT PIN DESCRIPTIONS EDGE CONNECTOR 39 40 41 42 43 44 DUT PIN DESCRIPTIONS ST (pin 22) – TTL Input – Send Timing; source for ST(a) and ST(b) outputs. SP503 only. STEN (pin 23) – TTL Input — Driver enable control pin; active low. SP503 only, SCT(a) (pin 76) – Analog Input – Inverting; input for SCT receiver; SP503 only. SCT(b) (pin 77) – Analog Input – Non– inverting; input for SCT receiver. SP503 only. VCC — +5V for all circuitry. GND — signal and power ground. IC(a) (pin 39) – Analog In – Incoming call; inverted; source for Rl. RT(b) (pin 38) – Analog In – Receive timing, non–inverted; source for RxC. RT(a) (pin 37) – Analog In – Receive timing; inverted; source from RxC. RR(b) (pin 36) – Analog In – Receiver ready; non–inverted; source for DCD. RR(a) (pin 35) – Analog In – Receiver ready; inverted; source for DCD. LL (pin 24) – TTL Input – Local loopback; source for LL(a) and LL(b) outputs. Rl (pin 21) – TTL Output – Ring indicator; sourced from IC(a) and IC(b) inputs. RxC (pin 20) – TTL Output – Receive clock; sourced from RT(a) and RT(b) inputs. DCD (pin 19) – TTL Output – Data carrier detect; sourced from RR(a) and RR(b) inputs. RL (pin 17) – Analog Out – Remote loopback; source for RL(a) and RL(b) outputs. RTS (pin 16) – TTL Input – Ready to send; source for RS(a) and RS(b) outputs. TxC (pin 15) – TTL Input – Transmit clock; source for TT(A) and TT(B) outputs. 27 28 29 30 31 45 32 LL(a) (pin 51) – Analog Out – Local loopback, inverted; sourced from LL. 33 LL(b) (pin 49) – Analog Out – Local loopback, non–inverted sourced from LL. RL(a) (pin 47) – Analog Out – Remote loopback; inverted; sourced from RL. RL(b) (pin 45) – Analog Out – Remote loopback; non–inverted; sourced from RL. ST(b) (pin 44) – Analog Out – Send timing, non–inverted; sourced from TxC. ST(a) (pin 42) – Analog Output –Send timing, inverted; sourced from TxC. IC(b) (pin 40) – Analog In – Incoming call; non–inverted; source for Rl. 46 34 35 47 48 36 49 37 38 50 Rev. 7/21/03 SP502 Multi-Mode Serial Transceiver © Copyright 2003 Sipex Corporation 29 PACKAGE: 80 PIN MQFP D D1 D2 PIN 1 c 0.30" RAD. TYP. 0.20" RAD. TYP. C L E1 E E2 0° MIN. 5°-16° 0°–7° 5°-16° C L L L1 A2 b e A1 A Seating Plane DIMENSIONS Minimum/Maximum (mm) SYMBOL A A1 A2 b D D1 D2 E E1 E2 e N 80–PIN MQFP JEDEC MS-22 (BEC) Variation MIN 0.00 1.80 0.22 17.20 BSC 14.00 BSC 12.35 REF 17.20 BSC 14.00 BSC 12.35 REF 0.65 BSC 80 2.00 NOM MAX 2.45 0.25 2.20 0.40 COMMON DIMENTIONS SYMBL MIN c L L1 0.11 0.73 0.88 NOM MAX 23.00 1.03 1.60 BASIC 80 PIN MQFP (MS-022 BC) Rev. 7/21/03 SP502 Multi-Mode Serial Transceiver © Copyright 2003 Sipex Corporation 30 PACKAGE: 80 PIN LQFP D D1 0.2 RAD MAX. c 0.08 RAD MIN. PIN 1 11° - 13° 0° Min C L E1 E 0°–7° 11° - 13° L L1 C L A2 b DIMENSIONS Minimum/Maximum (mm) SYMBOL A A1 A2 b D D1 e E E1 N 0.05 1.35 0.22 1.40 0.32 A e 80-PIN LQFP JEDEC MS-026 (BEC) Variation MIN NOM MAX 1.60 0.15 1.45 0.38 A1 Seating Plane COMMON DIMENTIONS SYMBL MIN c L L1 0.11 0.45 0.60 NOM MAX 23.00 0.75 1.00 BASIC 16.00 BSC 14.00 BSC 0.65 BSC 16.00 BSC 14.00 BSC 80 80 PIN LQFP Rev. 7/21/03 SP502 Multi-Mode Serial Transceiver © Copyright 2003 Sipex Corporation 31 ORDERING INFORMATION Model Temperature Range Package Types SP502CF ............................................... 0°C to +70°C ............................ 80–pin JEDEC (MS-022 BC) MQFP SP502CM .............................................. 0°C to +70°C ........................... 80-pin JEDEC (MS-026 BEC) LQFP Corporation ANALOG EXCELLENCE Sipex Corporation Headquarters and Sales Office 233 South Hillview Drive Milpitas, CA 95035 TEL: (408) 934-7500 FAX: (408) 935-7600 Sales Office 22 Linnell Circle Billerica, MA 01821 TEL: (978) 667-8700 FAX: (978) 670-9001 e-mail: sales@sipex.com 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 hereing; neither does it convey any license under its patent rights nor the rights of others. Rev. 7/21/03 SP502 Multi-Mode Serial Transceiver © Copyright 2003 Sipex Corporation 32