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| Corporation SP306 RS-422/RS-423 Line Drivers/Receivers SIGNAL PROCESSING EXCELLENCE s Single chip serial transceiver supports RS-422 or RS-423 interfaces s Programmable Selection of Interface s Two Full-Duplex Channels of Either Interface s Software-Selectable Mode s Loopback for Self-Testing s Short-Circuit Protected s Surface Mount Packaging DESCRIPTION... The SP306 is a single chip device that offers both RS-422 and RS-423-type serial interfaces. The device can be programmed to provide two full-duplex channels of either RS-422 or RS-423 via two mode control pins. The SP306 also features a loopback function that can be activated in any operating mode. The SP306 is available in a 28-pin SOIC package for operation over the commercial temperature range. SUPPLY +5V +12V -12V 28 1 15 VCC VDD VEE 7 8 22 SELECT A SELECT B LOOPBACK 6 T1 5 9 T2 SP306 ROUTA 26 R1 10 2 3 TINA 23 TOUTA1 TOUTA2 TOUTB1 TOUTB2 RINA2 RINA1 TINB 20 ROUTB 17 14 13 R2 GND 12 RINB2 RINB1 Corporation 89 SIGNAL PROCESSING EXCELLENCE SPECIFICATIONS (TMIN T A T MAX and nominal supply voltages unless otherwise noted) PARAMETER RS-423 DRIVER TTL Input Level VIL VIH High Level Output Low Level Output MIN. TYP. MAX. UNIT CONDITIONS 0 2.0 +3.0 -3.0 720 0.8 +6.0 (VDD - 0.7V) -6.0 (VEE +0.7V) 40 6.0 Short Circuit Current 100 Output Current 500 Transition Time 400 Maximum Transmission Rate 500 RS-422 RECEIVER Common Mode Range 7 Differential Input 15 Differential Input Threshold -0.2 +0.2 Input Voltage Hysteresis 30 Input Resistance 3 TTL Output Level VOL 0.4 VOH 2.4 Maximum Receiving Rate 500 Short Circuit Output Current 120 POWER REQUIREIMENTS VDD = +12V 7 15 VCC = +5V 5 7 VEE = -12V 11 20 ENVIRONMENTAL AND MECHANICAL Operating Temperature -C 0 +70 -M -55 +125 Storage Temperature -65 +150 Package -C 28-pin SOIC -F 28-pin Ceramic Flatpack Short Circuit Current Transition Time Maximum Transmission Rate 100 RS-423 RECEIVER Input Threshold -200 Input Impedance 4 TTL Output Level VOL VOH 2.4 Maximum Receiving Rate 100 RS-422 DRIVER TTL Input Level VIL 0 VIH 2.0 High Level Output +2.75 Low Level Output Differential Output 2.0 V V V V V V mA ns kbps mV k V V kbps RL = 450, VIN = 0.8V; Note 6 RL = RL = 450, VIN = 2.0V; Note 6 RL = VOUT = 0V; Note 2 RL = 450, CL = 50pF; Note 3 Common-mode = 7V; Note 1 RIN = 10V VCC =+4.75V, IOUT =+1.6mA VCC =+4.75V, IOUT =-0.5mA Note 3 +200 0.4 0.8 +6 +1.0 V V V V V V mA A ns kbps V V V mV k V V kbps mA mA mA mA IOH = -20mA IOL = 20mA RL = 100 RL = -0.25V VO 6V; Power off RL =450, CL =15pF; Note 3 Note 4 Note 4 TA=25C VCM =0V;TA=25C -7VVCM+7V VCC =+4.75V, IOUT=+1.6mA VCC =+4.75V, IOUT=-0.5mA VOUT=0V All Transmitter outputs RL= TA=25C C C C 90 Corporation SIGNAL PROCESSING EXCELLENCE Note: 1. The common mode voltage is defined as the algebraic mean of the two voltages appearing at the receiver input terminals with respect to the receiver circuit ground. 2. Only one output drive pin per package will be shorted at any time. 3. From 10% to 90% of steady state. 4. This is an absolute maximum rating. Normal operating levels are VIN 5V. 5. Outputs unloaded. Inputs tied to GND; TA =+25C; VIL = 0V; LB = 0. 6. VOL/VOH will typically be 3V over -55C to +125C with 450 loads. PINOUT VDD RINA2 RINA1 N.C. TOUTA2 TOUTA1 SELECTA SELECTB TOUTB1 1 2 3 4 5 6 7 8 9 28 VCC 27 N.C. 26 ROUTA 25 N.C. 24 N.C. 23 TINA 22 LOOPBACK 21 N.C. 20 TINB 19 N.C. 18 N.C. 17 ROUTB 16 N.C. 15 VEE SP306 TOUTB2 10 N.C. 11 RINB1 12 RINB2 13 GND 14 PIN ASSIGNMENTS Pin 1 -- VDD -- +12V Power Supply. Pin 2 -- RINA2 -- RS422 input. Pin 3 -- RINA1 -- RS422/RS423 input. Pin 4 -- N.C. -- No Connection. Pin 5 -- TOUTA2 --RS422 output. Pin 6 -- TOUTA1 -- RS422/RS423 output. Pin 7 -- SEL A -- Select A; used with Select B (pin 8) to select operating mode; please refer to SP306 Control Logic Configuration section for truth table. Pin 8 -- SEL B -- Select B; used with Select A (pin 7) to select operating mode; please refer to SP306 Control Logic Configuration section for truth table. Pin 9-- TOUTB1-- RS422/RS423 output. Pin 10 -- TOUTB2 -- RS422 output. Pin 11 -- N.C. -- No Connection. Pin 12-- RINB1-- RS422/RS423 input. Pin 13 -- RINB2-- RS422 input Pin 14 -- GND -- Signal ground. Connected to logic and chasis ground. Pin 15 -- VEE -- -12V Power Supply. Pin 16 -- N.C. -- No Connection. Pin 17 -- ROUTB -- TTL output. Pin 18 -- N.C. -- No Connection. Pin 19 -- N.C. -- No Connection. Pin 20 -- TINB -- TTL input. Pin 21 -- N.C. -- No Connection. Pin 22 -- LOOPBACK -- Active low; logic "1" selects operating mode controlled by SELECT A and SELECT B; logic "0" selects loopback configuration for whatever operating mode is selected by states of SELECT A and SELECT B. Pin 23 -- TINA -- TTL input. Pin 24 -- N.C. -- No Connection. Pin 25 -- N.C. -- No Connection. Pin 26 -- ROUTA -- TTL output. Pin 27 -- N.C. -- No Connection. Pin 28 -- VCC -- +5V Power Supply. FEATURES... The SP306 is a single chip device that offers both RS-422 and RS-423 serial interfaces. The device can be programmed via two control mode pins (7 and 8). In either operating mode, the SP306 provides two full-duplex channels. A loopback function is also provided for chip self- test, which connects driver outputs to receiver inputs with no external circuitry. The RS-422 drivers convert TTL logic levels into RS-422 differential output signals. The RS-422 line driver outputs feature high source Corporation 91 SIGNAL PROCESSING EXCELLENCE and sink current capability. The RS423 line drivers convert TTL logic levels into inverted RS-423 output signals. All line drivers are internally protected against short circuits on their outputs. The RS-422 receivers convert the RS-422 differential input signals into non-inverted TTL logic levels. Receiver input thresholds are 200mV. The RS-422 receivers can receive input data up to 1Mbps. The RS-423 receivers convert the RS-423 input signals into inverted TTL output logic levels. The RS-423 receivers have an input threshold of 200mV, and can receive data up to 100kbps. A loopback test mode is provided that puts the driver outputs into a high impedance tri-state level, and routes the driver outputs to their associated receiver inputs. In this configuration, the signal path is non-inverting from the TTL driver inputs to the receiver TTL outputs. This operating mode allows the controlling system to perform diagnostic self-test of the RS-422/ RS-423 transceiver circuitry at speeds up to 3kbps. APPLICATION INFORMATION Control Logic Configuration Software control of the SP306 is via two select pins (7 and 8) and a loopback control pin (22). SELECT A and SELECT B allow the user to program the SP306 for four different interface modes. Loopback mode can be selected in any of these interface modes. The figures that follow outline the various operating modes that are supported by the SP306. SUPPLY +5V +12V -12V SUPPLY +5V +12V -12V 28 1 15 VCC VDD VEE SELECT A = 0 SELECT B = 0 LOOPBACK = 1 7 8 22 SELECT A SELECT B LOOPBACK SELECT A = 0 SELECT B = 0 LOOPBACK = 0 7 8 22 28 1 15 VCC VDD VEE SELECT A SELECT B LOOPBACK TOUTA1 RINA1 TINA ROUTA TOUTA*1 RINA1 TINA ROUTA TOUTB1 RINB1 TINB ROUTB TOUTB*1 RINB1 TINB ROUTB 14 GND 14 SP306 GND SP306 RS-423 DRIVER * Tri-state output RS-423 RECEIVER RS-422 RECEIVER RS-422 DRIVER * Tri-state output Figure 1. Control Input Configuration -- SELECT A = 0, SELECT B = 0 92 Corporation SIGNAL PROCESSING EXCELLENCE SUPPLY +5V +12V -12V SUPPLY +5V +12V -12V 28 1 15 VCC VDD VEE SELECT A = 0 SELECT B = 1 LOOPBACK = 1 7 8 22 SELECT A SELECT B LOOPBACK SELECT A = 0 SELECT B = 1 LOOPBACK = 0 28 1 15 VCC VDD VEE 7 8 22 SELECT A SELECT B LOOPBACK TOUTA1 RINA1 TINA ROUTA TOUTA*1 RINA1 TINA ROUTA RINB2 RINB1 TOUTB1 TOUTB2 ROUTB RINB2 RINB1 TOUTB*1 TOUTB*2 ROUTB TINB TINB 14 GND 14 SP306 GND SP306 RS-423 DRIVER * Tri-state output RS-423 RECEIVER RS-422 RECEIVER RS-422 DRIVER * Tri-state output Figure 2. Control Input Configuration -- SELECT A = 0, SELECT B = 1 SUPPLY +5V +12V -12V SUPPLY +5V +12V -12V 28 1 15 VCC VDD VEE SELECT A = 1 SELECT B = 0 LOOPBACK = 1 RINA2 RINA1 TOUTA1 TOUTA2 28 1 15 VCC VDD VEE SELECT A = 1 SELECT B = 0 LOOPBACK = 0 RINA2 RINA1 TOUTA*1 TOUTA*2 7 8 22 SELECT A SELECT B LOOPBACK 7 8 22 SELECT A SELECT B LOOPBACK ROUTA ROUTA TINA TINA TOUTB 1 RINB1 TINB ROUTB TOUTB *1 RINB1 TINB ROUTB 14 GND 14 SP306 GND SP306 RS-423 DRIVER * Tri-state output RS-423 RECEIVER RS-422 RECEIVER RS-422 DRIVER * Tri-state output Figure 3. Control Input Configuration -- SELECT A = 1, SELECT B = 0 Corporation 93 SIGNAL PROCESSING EXCELLENCE SUPPLY +5V +12V -12V SUPPLY +5V +12V -12V 28 1 15 VCC VDD VEE SELECT A = 1 SELECT B = 1 LOOPBACK = 1 RINA2 RINA1 TOUTA1 TOUTA2 RINB2 RINB1 TOUTB1 TOUTB2 28 1 15 VCC VDD VEE SELECT A = 1 SELECT B = 1 LOOPBACK = 0 RINA2 RINA1 TOUTA*1 TOUTA*2 RINB2 RINB1 TOUTB*1 TOUTB*2 7 8 22 SELECT A SELECT B LOOPBACK 7 8 22 SELECT A SELECT B LOOPBACK ROUTA ROUTA TINA TINA ROUTB ROUTB TINB TINB 14 GND 14 SP306 GND SP306 RS-423 DRIVER * Tri-state output RS-423 RECEIVER RS-422 RECEIVER RS-422 DRIVER * Tri-state output Figure 4. Control Input Configuration -- SELECT A = 1, SELECT B = 1 ORDERING INFORMATION Model Temperature Range Package Two full-duplex channels RS-422/RS-423 SP306CT ................................................ 0C to +70C ............................................................... 28-pin SOIC SP306MF .......................................... -55C to +125C ........................................... 28-pin Ceramic Flatpack 94 Corporation SIGNAL PROCESSING EXCELLENCE |
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