ST3293 RS-422 HIGH SPEED TRANSCEIVER WITH DIGITAL EMPHASIS ■ ■ ■ ■ ■ FULL DUPLEX COMMUNICATIONS DEVICE RS-422 PROGRAMMABLE EMPHASIS INCREASES THE DISTANCE AND DATA RATE HIGH SPEED: DATA RATE UP TO 25Mbps -7V TO 7V COMON-MODE INPUT VOLTAGE RANGE LVTTL LOGIC INPUT THRESHOLDS SOP DESCRIPTION The ST3293 is a high-speed RS-422 transceiver with an emphasis circuitry on the driver which allows reliable long distance communication at high data rate by reducing inter symbolic interference. The differential amplitude of the ST3293 is digitally programmable in 7 steps through 3 control pins. The emphasis reduces the inter symbolic interference by increasing the signal amplitude under the micro control and counteracting the effects of the cable with the varying data stream. The ST3293 is a full duplex device that operates from a single +5V supply. It features driver output short circuit current limiting and an open circuit fail-safe receiver input. The PE input can be used as an emphasis enable. The PE held LOW disable the emphasis instead set to HIGH enable the emphasis with the configuration on C0, C1 and C2 when DI change logic level. The DI input can direct drive the outputs with a fixed emphasis or without emphasis as shown in the timing diagram. ORDERING CODES Type Temperature Range Package Comments ST3293BD ST3293BDR -40 to 85 °C -40 to 85 °C SO-14 (Tube) SO-14 (Tape & Reel) 50 parts per tube / 20 tube per box 2500 parts per reel January 2003 1/11 ST3293 PIN CONFIGURATION PIN DESCRIPTION PlN N° SYMBOL 1 C0 Emphasis Control Input 0 2 3 C1 C2 PVCC Emphasis Control Input 1 Emphasis Control Input 2 Supply Voltage RO DI PGND Y Z B A PE LGND LVCC Receiver Output Driver Input Ground Non-inverting Driver Output Inverting Driver Output Inverting Receiver Input Non-inverting Receiver Input Emphasis Enable Ground Supply Voltage 4 5 6 7 8 9 10 11 12 13 14 NAME AND FUNCTION TRUTH TABLE TRANSMITTING INPUTS INPUTS OUTPUTS EMPHASIS STATUS PE DI PECTRL L H H X 0->1 1->0 L H H X= Don’t Care; Z=High Impedance 2/11 Disabled Enabled Enabled ST3293 EMPHASIS CONTROL INPUT INPUTS PE = HIGH DRIVER EMPHASIS FACTOR (DEF) C0 C1 C2 RL = 100 Ω L L L L H H H H L L H H L L H H L H L H L H L H 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 ABSOLUTE MAXIMUM RATINGS Symbol VCC Parameter Supply Voltage C0, C1, Control Input Voltage C2, DI, PE Y, Z Value Unit -0.5 to 7 V -0.5 to 7 V -0.5 to 7 V A, B Driver Output Voltage VCC = 0V or VOUT = Z-state Receiver Input Voltage RO Receiver Output Voltage PD TJ Continuous Total Power Dissipation (SO-14) Operating Junction Temperature Range 0.5 W -40 to 150 °C Tstg Storage Temperature Range -65 to 150 °C ESD Human Boby Model (Receiver Inputs vs GND) ±1 KV -14 to 14 V -0.5 to (VCC + 0.5) V Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is not implied. RECOMMENDED OPERATING CONDITIONS Symbol Parameter Test Conditions Min. Typ. Max. Unit 4.75 5.25 V VCC Supply Voltage VIH High Level Logic Input Voltage C0, C1, C2, DI, PE 2 VCC V VIL Low Level Logic Input Voltage C0, C1, C2, DI, PE 0 0.8 V IIN Input Current of Logic Input C0, C1, C2, DI, PE ±2 µA ICC Supply Current No Load 4 mA TA Operating Temperature Range 85 °C -40 3/11 ST3293 DRIVER ELECTRICAL CHARACTERISTICS (VCC = 5V ± 5%, -40°C < TA < 85°C, unless otherwise noted. Typical values are referred to Ta = 25°C) Symbol Parameter Test Conditions Min. |VOD| Differential Output Voltage No Load 2 |VOD1| Differential Output Voltage without Emphasis Differential Output Emphasis Step Precision Differential Output Emphasis Factor Differential Driver Output with Emphasis R = 100 Ω, PE = Low 2 DPER DEF |VOPD| ∆VOD VOC ∆VOC IOFF IOSD Change in Magnitude of Differential Output Voltage Driver Common-Mode Output Voltage Change in Magnitude of Common Mode Output Voltage Output Leakage Current (Y and Z) Driver Short Circuit Output Current Typ. 2.32 Max. Unit VCC V 2.8 V See Truth Table 0.9 1.1 See Truth Table 1 2 R = 100 Ω, DEF = 1.1 R = 100 Ω, DEF = 1.7 R = 100 Ω, All DEF values R = 100 Ω, All DEF values R = 100 Ω -0.2 2.52 3.85 0 0.2 V 1 VCC/2 3.5 V -0.2 0 0.2 V 0.1 ±100 µA -50 -150 mA VCC = GND VO = 6V VO = 0V, C0 = C1 = C2 = 0 -30 V RECEIVER DC ELECTRICAL CHARACTERISTICS (VCC = 5V ± 5%, -40°C < TA < 85°C, unless otherwise noted. Typical values are referred to Ta = 25°C) Symbol Parameter Test Conditions Min. -7V ≤ VCM ≤ 7V VHYST Receiver Differential Threshold Voltage Receiver Input Hysteresis VOL Low Level Output Voltage IOL = 4mA GND VOH 3.7 VTH -200 VCM = 0V High Level Output Voltage IOH = -4mA IIN Input Current VIN=10V, Other Input = GND RIN Receiver Input Resistance 4/11 Max. Unit 200 mV 50 VIN=10V, Other Input = GND -7V ≤ VCM ≤ 7V, VCC = 0V Typ. 12 mV 0.2 0.4 mV 4.7 VCC mV 0.32 1.5 mA -0.5 -2.5 24 KΩ ST3293 SWITCHING CHARACTERISTICS (VCC = 5V ± 5%, -40°C < TA < 85°C, unless otherwise noted. Typical values are referred to Ta = 25°C) Symbol Parameter tDPLH tDPHL Driver Differential Propagation Delay, Low to High and High to Low tTLH, tTHL Driver Differential rise and fall time Propagation delay time tEDO from PE, C0, C1, C2 to differential output without emphasis Setup Time PE to DI ts th tDSKEW Hold Time PE to DI Differential Driver Output Skew |tdPLH-tdPHL| Test Conditions Typ. Max. Unit RDIFF = 100 Ω CL1 = CL2 = 50pF 16 25 ns RDIFF = 100 Ω CL1 = CL2 = 50pF 8 12 ns 45 ns RDIFF = 100 Ω CL1 = CL2 = 50pF |DO|-200mV RDIFF = 100 Ω CL1 = CL2 = 50pF RDIFF = 100 Ω CL1 = CL2 = 50pF -8 RDIFF = 100 Ω CL1 = CL2 = 50pF 1.5 RDIFF = 100 Ω CL1 = CL2 = 50pF tRLH, tRHL Receiver Propagation Delay CL = 15pF, VID = 2V, VCM = 0V CL = 15pF tRSKEW Receiver Output Skew |tRLH-tRHL| fMAX Maximum Frequency Min. ns 8 25 ns 3 40 ns Mbps 28 45 ns 2 4 ns 5/11 ST3293 LOGIC DIAGRAM Figure 1 : Test Circuit 6/11 ST3293 Figure 2 : Figure 3 : Figure 4 : 7/11 ST3293 Figure 5 : Figure 6 : Figure 7 : 8/11 ST3293 SO-14 MECHANICAL DATA DIM. mm. MIN. TYP A a1 inch MAX. MIN. TYP. 1.75 0.1 0.068 0.2 a2 MAX. 0.003 0.007 1.65 0.064 b 0.35 0.46 0.013 0.018 b1 0.19 0.25 0.007 0.010 C 0.5 0.019 c1 45˚ (typ.) D 8.55 8.75 0.336 0.344 E 5.8 6.2 0.228 0.244 e 1.27 0.050 e3 7.62 0.300 F 3.8 4.0 0.149 0.157 G 4.6 5.3 0.181 0.208 L 0.5 1.27 0.019 0.050 M S 0.68 0.026 8 ˚ (max.) PO13G 9/11 ST3293 Tape & Reel SO-14 MECHANICAL DATA mm. inch DIM. MIN. A MAX. MIN. 330 13.2 TYP. MAX. 12.992 C 12.8 D 20.2 0.795 N 60 2.362 T 10/11 TYP 0.504 22.4 0.519 0.882 Ao 6.4 6.6 0.252 0.260 Bo 9 9.2 0.354 0.362 Ko 2.1 2.3 0.082 0.090 Po 3.9 4.1 0.153 0.161 P 7.9 8.1 0.311 0.319 ST3293 ormation furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the nsequences of use of such information nor for any infringement of patents or other rights of third parties which may result from use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications entioned in this publication are subject to change without notice. This publication supersedes and replaces all information eviously supplied. 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