SP304

SP304 SIPEX | Alldatasheet

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SIGNAL PROCESSING EXCELLENCE SP304 RS-232/RS-422 Line Drivers/Receivers n RS-232 and RS-422 on One Chip n Multiple Drivers and Receivers n Software-selectable Modes n Loopback for Self-Testing n Short-circuit Protected n Single-width 24-pin DIP and 28–pin SOIC Packages DESCRIPTION… The SP304 is an enhanced-performance version of the Sipex SP302 RS-232 and RS-422 protocol line drivers and receivers. It is pin-for-pin compatible with the SP302 , and in any configuration, fully meets the requirements of the EIA RS-232D and RS-422 data communication standards. A loopback test mode is provided.The SP304 is available in 24-pin single width plastic DIP, and 28-pin SOIC packages for commercial and industrial temperature range operation. RIB1 ROB 1 TOB 1 TIB1 RIA1 ROA 1 TOA 1 TIA1 SELECT A B TOA 2 RIA2TOB 2 TIB2 RIB2 ROB 2 VDD GND VCC VEE SP304LOOP– BACK Corporation SIGNAL PROCESSING EXCELLENCE

SIGNAL PROCESSING EXCELLENCE SPECIFICATIONS (TMIN ≤ TA ≤ TMAX and nominal supply voltages unless otherwise noted) PARAMETER MIN. TYP. MAX. UNITS CONDITIONS RS-232 DRIVER TTL Input Level VIL 0 0.8 V VIH 2.0 V High Level Output +5.0 V R L = 3kΩ , VIN = 0.8V Low Level Output -5.0 V R L = 3kΩ , VIN = 2.0V Short Circuit Current ±30 mA V OUT = 0V Loopback Output Voltage -1.5 V R L = 3kΩ , VEE = -12.0V; Note 1 Slew rate 30 V/ µsC L = 50pF, RL = 3kΩ ; TA = 25°C Transition Time 3 µsV OUT from +3V to -3V or -3V to +3V Maximum Transmission Rate 200 kbps RS-232 RECEIVER Input Voltage Range -15 +15 V Note 6 Input High Threshold +1.75 +2.5 V Positive-going Input Low Threshold +0.75 +1.35 V Negative-going Input Impedance 3 7 k Ω TTL Output Level V OL 0.4 V V CC = +4.75V, IOUT = +1.6mA VOH 2.4 V V CC = +4.75V, IOUT = -0.5mA Maximum Receiving Rate 200 kbps RS-422 DRIVER TTL Input Level VIL 0 0.8 V VIH 2.0 V High Level Output 2.75 6.0 V I OH = -20mA Low Level Output 1.0 V I OL = +20mA Differential Output ±2V R L = 100Ω ±6V R L = ∞ Short Circuit Current ±100 mA Note 2 Output Current ±500 µA -0.25V ≤ VO ≤ 6V; power off Transition Time 400 ns R L = 100Ω , CL = 15pF; Note 3 Maximum Transmission Rate 1,000 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 1,000 kbps Short Circuit Output Current ±120 mA V OUT = 0V POWER REQUIREMENTS VDD = +12V, ± 10% 7 15 mA Note 5 VCC = +5V, ±10% 5 7 mA Note 5 VEE = -12V, ±10% 11 20 mA Note 5 ENVIRONMENTAL Operating Temperature -CS 0 +70 °C -MR -55 +125 °C Storage Temperature -65 +150 °C

SIGNAL PROCESSING EXCELLENCE Notes: 1. In Loopback mode 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 Typical SP304 current drains under full load are: 18mA (+12V), 10mA (-12V) and 7mA (+5V) in RS-232 mode only; 5mA (+12V), 7mA (-12V) and 56mA (+5V) in RS-422 mode only; 12mA (+12V), 14mA (-12V) and 31mA (+5V) in RS-232 and RS-422 modes; RS232 loads 3kΩ , 2500pF, 20kHz; RS422 outputs across 100Ω , 500kHz. RS-422 Driver GND GND –5V TIN TOUT 500kHz GND 10V GND –10V TIN TOUT 20kHz RS-232 Driver RS-422 Receiver 500kHz GND –2V GND R IN R OUT 20kHz GND –5V GND R IN R OUT RS-232 Receiver TYPICAL PERFORMANCE CURVES

SIGNAL PROCESSING EXCELLENCE PIN ASSIGNMENTS SP304CS VDD (+12V) 1 RIA2 2 RIA1 3 TOA 2 4 TOA 1 5 SELECT A 6 SELECT B 7 TOB 1 8 TOB 2 9 RIB1 10 RIB2 11 GND 12

24 VCC (+5V)

23 ROA2

22 ROA1

21 TIA2

20 TIA1

18 N.C.

17 TIB

16 TIB2

15 ROB1

14 ROB2

13 VEE (-12V)

VDD (+12V) 1 RIA2 2 RIA1 3 N.C. 4 TOA 2 5 TOA 1 6 SELECT A 7 SELECT B 8 TOB 1 9 TOB 2 10 N.C. 11 RIB1 12 RIB2 13 GND 14

28 VCC (+5V)

27 ROA2

26 ROA1

25 N.C.

24 TIA

23 TIA1

21 N.C.

20 TIB

19 TIB2

18 N.C.

17 ROB

16 ROB2

15 VEE (-12V)

might result from low amplitude noise voltages during slower-speed signal transitions. A loopback test mode is provided that puts the driver outputs to 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 input to the receiver TTL output. This operating mode allows the controlling system to perform diagnostic self-test of the RS-232/ RS-422 driver/receiver circuitry at speeds up to 3,000 bits per second. In the loopback mode a ±13.2V input range may be applied to the re- ceiver inputs with no interference to the loopback test. In addition, the driver outputs are in a true high–impedance state during loopback. The SP304 is available in 24-pin single width (0.300") plastic DIP and 28-pin SOIC packages, for operation over the commercial and indus- trial temperature ranges. FEATURES… The SP304 is a proprietary single-chip device that contain both RS-232 and RS-422 protocol line drivers and receivers. It is pin–for–pin com- patible with the Sipex SP302. Like the SP302 , its configuration may be changed at any time by logic levels on two control lines. In any configu- ration, the SP304 fully meets the requirements of both the EIA RS-232D and RS-422 data communication standards. The SP304 enhance- ments include improved isolation from external signals and a true high–impedance driver output in the loopback test mode, and no power up sequence requirements. The RS-232 line driver circuits convert TTL logic level inputs into inverted RS-232 output signals. The RS-422 line drivers convert TTL logic levels into RS-422 differential output sig- nals. The RS-422 line driver outputs feature high source and sink current capability. All line drivers are internally protected against short circuits on their outputs. The RS-232 receivers convert the EIA RS-232 input signals to inverted TTL output logic lev- els. The RS-422 receivers convert the EIA RS- 422 differential input signals into non-inverted TTL output logic levels. Receiver input filtering provides excellent high frequency noise immu- nity. Input pulses with widths less than 1µs are completely ignored. The RS-232 receivers have the additional feature of voltage hysteresis, which helps eliminate spurious output transitions that USING THE SP304 POWER SUPPLIES The SP304 requires ±12V and +5V for full RS-232 and RS-422 operation. The ±12V sup- plies set up the RS-232 ±9V voltage swings, and the +5V is used for the internal logic that for- mats the communications mode and controls the loopback function. The supply voltages can be decreased to as low as ±7V for V DD and VEE , and

SIGNAL PROCESSING EXCELLENCE supplying ±2V minimum into a 100Ω load. Short circuit protection for the RS-422 operat- ing mode is the same as in the RS-232 mode. The driver outputs can be shorted to ground for an infinite duration, with a maximum current of ±100mA. The RS-422 receivers accept differential signals at a 1Mbps rate, and translate them to a non- inverted TTL output. The receivers are speci- fied with a ±15V differential input voltage, which means that to operate normally, the dif- ference betweeen the voltages at the inputs cannot exceed ±15V. The common mode volt- age is specified as ±7V. This identifies the midpoint of the range about which the differen- tial input must lie so that the receiver can detect a change of state. Within this ±7V range, the receivers will recognize a change in state with a ±200mV differential threshold voltage. Since the RS-232 and RS-422 inputs are shared, all receiver inputs are protected to ±30V to guard against inadvertently applying an RS-232 signal to an input that is configured for RS-422. Figure 2 shows a typical circuit for the SP304 . In this case the SP304 is shown configured for one (1) duplex RS-422 and two (2) duplex RS-232 communication paths. CONFIGURING THE SP304 Figures 3, 4 and 5 show the various combina- tions of simultaneous RS-232 and RS-422 operation that can be achieved with the SP304 . Each of these configurations are software selectable by logic level on the SELECT A and SELECT B control lines. Configuration can be changed “on-the-fly”.

SIGNAL PROCESSING EXCELLENCE FIGURE 3: SP304 CONTROL LOGIC CONFIGURATION RIA1 SELECTION SELECT A: SELECT B: NON– LOOPBACK (LB = 1) LOOPBACK (LB=0) ROA 1 RIB2 ROB 1RIB1 TOB 1 TIB1TOB 2 TOA 1 TIA1 RIA1 ROA 1 TOA 1 TIA1 RIA2 ROA 1RIA1 TOA 1 TIA1TOA 2 RIA2 ROA 1RIA1 TOA 1 TIA1TOA 2 RIB2 ROB 1RIB1 TOB 1 TIB1TOB 2 RIB2 ROB 1RIB1 TOB* 1 TIB1TOB* 2 RIA2 ROA 1RIA1 TOA* 1 TIA1TOA* 2 LOGIC VALUE LOGIC VALUE LOGIC VALUE LOGIC VALUE RS-232 DRIVER * Tri–state Output RS-232 RECEIVER RS-422 RECEIVER RS-422 DRIVER RIA2 ROA 2 RIA2 ROA 2 TOA 2 TIA2 TOA 2 TIA2 RIB1 ROB 1 TOB 1 TIB1 RIB2 ROB 2 TOB 2 TIB2 RIA1 ROA 1 TOA* 1 TIA1 RIA2 ROA 2 TOA* 2 TIA2 RIB1 ROB 1 TOB 1 TIB1 RIB2 ROB 2 TOB 2 TIB2 RIA1 ROA 1 TOA* 1 TIA1 RIA2 ROA 2 TOA* 2 TIA2 RIB1 ROB 1 TOB 1 TIB1 RIB2 ROB 2 TOB 2 TIB2 RIB1 ROB 1 TOB 1 TIB1 RIB2 ROB 2 TOB 2 TIB2 RIA2 ROA 1RIA1 TOA* 1 TIA1TOA* 2 RIB2 ROB 1RIB1 TOB* 1 TIB1TOB* 2

SIGNAL PROCESSING EXCELLENCE Four-Channel Duplex RS-232 Four independent channels of RS-232 line driver and four channels of RS-232 receiver. Two-Channel Duplex RS-232 & One-Channel Duplex RS-422 Two RS-232 line drivers and receivers, and a single RS-422 line driver and receiver. FIGURE 4: SP304 CONFIGURATIONS RIA1 ROA 1 TOA 1TIA1 RIB1 ROB 1 TOB 1TIB1 RS-232 LINE DRIVERS RS-232 RECEIVERS RIA2 ROA 2 TOA 2TIA2 RIB2 ROB 2 TOB 2TIB2 SELECT A = 0 SELECT B = 0 LB = 1 RIA1 ROA 1 TOA 1TIA1 RIB1 ROB 1 TOB 1TIB1 RS-422 LINE DRIVER RS-422 RECEIVER TOB 2 RIB2 TOA 2TIA2 RIA2 ROA 2 RS-232 LINE DRIVERS RS-232 RECEIVERS SELECT A = 0 SELECT B = 1 LB = 1

SIGNAL PROCESSING EXCELLENCE SP304 CONFIGURATIONS IN LOOPBACK MODE Two -Channel Full Duplex RS-232 One-Channel Full Duplex RS-232 & One-Channel Full Duplex RS-422 LOOPBACK The SP304 has a function called loopback, which is essentially a chip self-test. However, by connecting system test loops with the inputs and outputs of the SP304, a system-level diagnostic can be run on power-up or on command. The test loops can be RIA1ROA 1 TOA 1TIA1 RIB1ROB 1 TOB 1TIB1 RS-232 LINE DRIVER RS-232 RECEIVER SELECT A = 0 SELECT B = 0 LB = 0 (ACTIVE) RIA2ROA 2 TOA 2TIA2 RIB2ROB 2 TOB 2TIB2 RS-232 LINE DRIVER RS-232 RECEIVER RS-232 LINE DRIVER RS-232 RECEIVER RS-232 LINE DRIVER RS-232 RECEIVER RIA1ROA 1 TOA 1TIA1 RIB1 ROB 1 TOB 1 TIB1 RS-232 LINE DRIVER RS-232 RECEIVER SELECT A = 0 SELECT B = 1 LB = 0 (ACTIVE) TOB 2 RIB2 TOA 2TIA2 RIA2ROA 2 RS-422 LINE DRIVER RS-422 RECEIVER RS-232 LINE DRIVER RS-232 RECEIVER enabled and disabled allowing both system test and operation with the same components. A maximum data rate for loopback of 3kbps is recommended. Loopback is a pin-programmable function, activated by a logic low on the LB pin (19). As shown in these figures, the loopback function internally con-

SIGNAL PROCESSING EXCELLENCE SP304 CONFIGURATIONS IN LOOPBACK MODE One-Channel Full Duplex RS-232 & One-Channel Full Duplex RS-422 Opposite Drivers Two-Channel Full Duplex RS-422 RIB1ROB 1 TOB 1TIB1 RIA1 ROA 1 TOA 1 TIA1 RS-232 LINE DRIVERS RS-232 RECEIVERS SELECT A = 1 SELECT B = 0 LB = 0 (ACTIVE) TOA 2 RIA2 TOB 2TIB2 RIB2ROB 2 RS-422 LINE DRIVER RS-422 RECEIVER RIA1 ROA 1 TOA 1 TIA1 RS-422 LINE DRIVERS RS-422 RECEIVERS SELECT A = 1 SELECT B = 1 LB = 0 (ACTIVE) TOA 2 RIA2 RIB1 ROB 1 RIB2 TOB 1 TIB1 TOB 2 RS-422 LINE DRIVERS RS-422 RECEIVERS nects the driver outputs to the corresponding receiver inputs, and switches the output pin to a high impedance from V EE to ground. Receiver outputs are left active for signal verification. During loopback, the receiver inputs are tied to ground via a 5kΩ pulldown resistor. The re- ceiver inputs can accept the full ±15V swings with no interference to the loopback function.

SIGNAL PROCESSING EXCELLENCE

ORDERING INFORMATION

Max # of Duplex Channels Model RS-232 RS-422 Temperature Package