SP306

SP306 SIPEX | Alldatasheet

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Technical content

SIGNAL PROCESSING EXCELLENCE 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. n Single chip serial transceiver supports RS-422 or RS-423 interfaces n Programmable Selection of Interface n Two Full–Duplex Channels of Either Interface n Software–Selectable Mode n Loopback for Self–Testing n Short–Circuit Protected n Surface Mount Packaging SP306 RS-422/RS-423 Line Drivers/Receivers LOOPBACK GND SUPPLY +5V +12V –12V R 1 VCC VDD VEE TINA TINB TOUT A1 TOUT A2 R INA1 R OUT A TOUT B2 TOUT B1 R INA2 R INB2 SP306 28 1 15 23 6 20 9 SELECT A SELECT B R OUT B R 2 R INB1 Corporation SIGNAL PROCESSING EXCELLENCE

SIGNAL PROCESSING EXCELLENCE SPECIFICATIONS (TMIN ≤TA ≤TMAX and nominal supply voltages unless otherwise noted) PARAMETER MIN. TYP. MAX. UNIT CONDITIONS RS-423 DRIVER TTL Input Level VIL 0 0.8 V VIH 2.0 V High Level Output +3.0 +6.0 V R L = 450Ω , VIN = 0.8V; Note 6 (VDD – 0.7V) V R L = ∞ Low Level Output –3.0 –6.0 V R L = 450Ω , VIN = 2.0V; Note 6 (VEE +0.7V) V R L = ∞ Short Circuit Current ±40 mA V OUT = 0V; Note 2 Transition Time 720 ns R L = 450Ω , CL = 50pF; Note 3 Maximum Transmission Rate 100 kbps RS-423 RECEIVER Input Threshold –200 +200 mV Common–mode = ±7V; Note 1 Input Impedance 4 k Ω RIN = ±10V TTL Output Level VOL 0.4 V V CC =+4.75V, IOUT =+1.6mA VOH 2.4 V V CC =+4.75V, IOUT =-0.5mA Maximum Receiving Rate 100 kbps RS-422 DRIVER Note 3 TTL Input Level VIL 0 0.8 V VIH 2.0 V High Level Output +2.75 +6 V I OH = –20mA Low Level Output +1.0 V I OL = 20mA Differential Output ±2.0 V R L = 100Ω ±6.0 V R L = ∞ Short Circuit Current ±100 mA Output Current ±500 µA –0.25V ≤ VO ≤ 6V; Power off Transition Time 400 ns R L=450Ω , CL=15pF; Note 3 Maximum Transmission Rate 500 kbps RS-422 RECEIVER Common Mode Range ±7 V Note 4 Differential Input ±15 V Note 4 Differential Input Threshold –0.2 +0.2 V T A=25°C Input Voltage Hysteresis 30 mV V CM =0V;TA=25°C Input Resistance 3 k Ω –7V≤VCM ≤+7V TTL Output Level VOL 0.4 V V CC =+4.75V, IOUT =+1.6mA VOH 2.4 V V CC =+4.75V, IOUT =–0.5mA Maximum Receiving Rate 500 kbps Short Circuit Output Current ±120 mA V OUT =0V POWER REQUIREIMENTS VDD = +12V 7 15 mA All Transmitter outputs R L=∞ VCC = +5V 5 7 mA T A=25°C VEE = –12V 11 20 mA ENVIRONMENTAL AND MECHANICAL Operating Temperature –C 0 +70 °C –M –55 +125 °C Storage Temperature –65 +150 °C Package –C 28–pin SOIC –F 28–pin Ceramic Flatpack

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 V IN ≤ 5V. 5. Outputs unloaded. Inputs tied to GND; TA =+25°C; VIL = 0V; LB = 0. 6. V OL /VOH will typically be ±3V over –55°C to +125°C with 450Ω loads. PINOUT 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 — ROUT B — TTL output. Pin 18 — N.C. — No Connection. Pin 19 — N.C. — No Connection. Pin 20 — T INB — 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 — T INA — TTL input. Pin 24 — N.C. — No Connection. Pin 25 — N.C. — No Connection. Pin 26 — R OUT A — TTL output. Pin 27 — N.C. — No Connection. Pin 28 — V CC — +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 V DD R INA2 R INA1 N.C. TOUT A2 TOUT A1 SELECTA SELECTB T OUT B1 TOUT B2 N.C. R INB1 R INB2 GND VCC N.C. R OUT A N.C. N.C. T INA LOOPBACK N.C. T INB N.C. N.C. R OUT B N.C. V EE SP306 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 — T OUT A2 —RS422 output. Pin 6 — TOUT A1 — 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— T OUT B1— RS422/RS423 output. Pin 10 — TOUT B2 — RS422 output. Pin 11 — N.C. — No Connection. Pin 12— RINB1— RS422/RS423 input.

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 inter- nally protected against short circuits on their outputs. The RS-422 receivers convert the RS-422 dif- ferential 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. Figure 1. Control Input Configuration — SELECT A = 0, SELECT B = 0

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 .

SIGNAL PROCESSING EXCELLENCE 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