DIFFERENTIAL BUS TRANSCEIVERS

SN65176B, SN75176B DIFFERENTIAL BUS TRANSCEIVERS SLLS101B – JULY 1985 – REVISED JUNE 1999 D D D D D D D D D D D D D Bidirectional Transceivers Meet or Exceed the Requirements of ANSI Standards TIA/EIA-422-B and TIA/EIA-485-A and ITU Recommendations V.11 and X.27 Designed for Multipoint Transmission on Long Bus Lines in Noisy Environments 3-State Driver and Receiver Outputs Individual Driver and Receiver Enables Wide Positive and Negative Input/Output Bus Voltage Ranges Driver Output Capability . . . ± 60 mA Max Thermal Shutdown Protection Driver Positive and Negative Current Limiting Receiver Input Impedance . . . 12 kΩ Min Receiver Input Sensitivity . . . ± 200 mV Receiver Input Hysteresis . . . 50 mV Typ Operate From Single 5-V Supply D OR P PACKAGE (TOP VIEW) R RE DE D 1 2 3 4 8 7 6 5 VCC B A GND description The SN65176B and SN75176B differential bus transceivers are monolithic integrated circuits designed for bidirectional data communication on multipoint bus transmission lines. They are designed for balanced transmission lines and meet ANSI Standards TIA/EIA-422-B and TIA/EIA-485-A and ITU Recommendations V.11 and X.27. The SN65176B and SN75176B combine a 3-state differential line driver and a differential input line receiver, both of which operate from a single 5-V power supply. The driver and receiver have active-high and active-low enables, respectively, that can be connected together externally to function as a direction control. The driver differential outputs and the receiver differential inputs are connected internally to form differential input/output (I/O) bus ports that are designed to offer minimum loading to the bus when the driver is disabled or VCC = 0. These ports feature wide positive and negative common-mode voltage ranges, making the device suitable for party-line applications. The driver is designed for up to 60 mA of sink or source current. The driver features positive and negative current limiting and thermal shutdown for protection from line-fault conditions. Thermal shutdown is designed to occur at a junction temperature of approximately 150°C. The receiver features a minimum input impedance of 12 kΩ, an input sensitivity of ± 200 mV, and a typical input hysteresis of 50 mV. The SN65176B and SN75176B can be used in transmission-line applications employing the SN75172 and SN75174 quadruple differential line drivers and SN75173 and SN75175 quadruple differential line receivers. The SN65176B is characterized for operation from – 40°C to 105°C and the SN75176B is characterized for operation from 0°C to 70°C. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright © 1999, Texas Instruments Incorporated POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 1 SN65176B, SN75176B DIFFERENTIAL BUS TRANSCEIVERS SLLS101B – JULY 1985 – REVISED JUNE 1999 Function Tables DRIVER INPUT D H L X ENABLE DE H H L RECEIVER DIFFERENTIAL INPUTS A–B VID ≥ 0.2 V – 0.2 V < VID < 0.2 V VID ≤ – 0.2 V X Open ENABLE RE L L L H L OUTPUT R H ? L Z ? OUTPUTS A H L Z B L H Z H = high level, L = low level, ? = indeterminate, X = irrelevant, Z = high impedance (off) logic symbol† DE RE 3 2 EN1 EN2 6 7 logic diagram (positive logic) DE D RE A B R 3 4 2 1 6 7 A B Bus D 4 1 1 R 1 2 † This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12. 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 SN65176B, SN75176B DIFFERENTIAL BUS TRANSCEIVERS SLLS101B – JULY 1985 – REVISED JUNE 1999 schematics of inputs and outputs EQUIVALENT OF EACH INPUT VCC R(eq) 16.8 kΩ NOM 960 Ω NOM 960 Ω NOM TYPICAL OF A AND B I/O PORTS VCC TYPICAL OF RECEIVER OUTPUT VCC 85 Ω NOM Input Output GND Driver input: R(eq) = 3 kΩ NOM Enable inputs: R(eq )= 8 kΩ NOM R(eq) = equivalent resistor Input/Output Port absolute maximum ratings over operating free-air temperature range (unless otherwise noted)† Supply voltage, VCC (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V Voltage range at any bus terminal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 10 V to 15 V Enable input voltage, VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V Package thermal impedance, θJA (see Note 2): D package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 197°C/W P package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104°C/W Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260°C Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 65°C to 150°C † Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. NOTES: 1. All voltage values, except differential input/output bus voltage, are with respect to network ground terminal. 2. The package thermal impedance is calculated in accordance with JESD 51, except for through-hole packages, which use a trace length of zero. recommended operating conditions MIN Supply voltage, VCC Voltage at any bus terminal (separately or common mode), VI or VIC mode) High-level input voltage, VIH Low-level input voltage, VIL Differential input voltage, VID (see Note 3) High-level High level output current, IOH current Low-level Low level output current, IOL current Operating free-air temperature, TA free air temperature Driver Receiver Driver Receiver SN65176B SN75176B – 40 0 D, DE, and RE D, DE, and RE 2 0.8 ± 12 – 60 – 400 60 8 105 70 4.75 TYP 5 MAX 5.25 12 –7 UNIT V V V V V mA µA mA °C NOTE 3: Differential-input/output bus voltage is measured at the noninverting terminal A with respect to the inverting terminal B. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 3 SN65176B, SN75176B DIFFERENTIAL BUS TRANSCEIVERS SLLS101B – JULY 1985 – REVISED JUNE 1999 DRIVER SECTION electrical characteristics over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted) PARAMETER VIK VO |VOD1| |VOD2| VOD3 ∆|VOD| VOC ∆|VOC| IO IIH IIL Input clamp voltage Output voltage Differential output voltage g Differential output voltage Differential output voltage Change in magnitude of differential output g g voltage§ Common-mode Common mode output voltage Change in magnitude of common-mode g g output voltage§ Output current High-level input current Low-level input current Output disabled, , See Note 5 VI = 2.4 V VI = 0.4 V VO = – 7 V VO = 0 VO = VCC VO = 12 V No load Outputs enabled Outputs disabled 42 26 VO = 12 V VO = – 7 V RL = 54 Ω or 100 Ω Ω, See Figure 1 TEST CONDITIONS† II = – 18 mA IO = 0 IO = 0 RL = 100 Ω, RL = 54 Ω, See Note 4 See Figure 1 See Figure 1 MIN 0 1.5 1/2 VOD1 or 2¶ 1.5 1.5 2.5 5 5 ±0 2 0.2 +3 –1 ±0 2 0.2 1 – 0.8 20 – 400 – 250 150 250 250 70 35 mA mA 3.6 TYP‡ MAX – 1.5 6 6 UNIT V V V V V V V V V mA µA µA IOS Short-circuit Short circuit output current ICC Supply current (total package) † The power-off measurement in ANSI Standard TIA/EIA-422-B applies to disabled outputs only and is not applied to combined inputs and outputs. ‡ All typical values are at VCC = 5 V and TA = 25°C. § ∆|VOD| and ∆|VOC| are the changes in magnitude of VOD and VOC, respectively, that occur when the input is changed from a high level to a low level. ¶ The minimum VOD2 with a 100-Ω load is either 1/2 VOD1 or 2 V, whichever is greater. NOTES: 4. See ANSI Standard TIA/EIA-485-A, Figure 3.5, Test Termination Measurement 2. 5. This applies for both power on and off; refer to ANSI Standard TIA/EIA-485-A for exact conditions. The TIA/EIA-422-B limit does not apply for a combined driver and receiver terminal. switching characteristics, VCC = 5 V, RL = 110 kΩ, TA = 25°C (unless otherwise noted) PARAMETER td(OD) tt(OD) tPZH tPZL tPHZ tPLZ Differential-output delay time Differential-output transition time Output enable time to high level Output enable time to low level Output disable time from high level Output disable time from low level TEST CONDITIONS RL = 54 Ω Ω, See Figure 4 See Figure 5 See Figure 4 See Figure 5 See Figure 3 MIN TYP 15 20 85 40 150 20 MAX 22 30 120 60 250 30 UNIT ns ns ns ns ns ns 4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 SN65176B, SN75176B DIFFERENTIAL BUS TRANSCEIVERS SLLS101B – JULY 1985 – REVISED JUNE 1999 SYMBOL EQUIVALENTS DATA-SHEET PARAMETER VO |VOD1| |VOD2| |VOD3| ∆|VOD| VOC ∆|VOC| IOS IO | |Vt| – |Vt| | |Vos| |Vos – Vos| |Isa|, |Isb| |Ixa|, |Ixb| Iia, Iib TIA/EIA-422-B Voa, Vob Vo Vt (RL = 100 Ω) TIA/EIA-485-A Voa, Vob Vo Vt (RL = 54 Ω) ( Vt (Test Termination Measurement 2) | |Vt – |Vt| | |Vos| |Vos – Vos| RECEIVER SECTION electrical characteristics over recommended ranges of common-mode input voltage, supply voltage, and operating free-air temperature (unless otherwise noted) PARAMETER VIT + VIT – Vhys VIK VOH VOL IOZ II IIH IIL rI IOS ICC Positive-going input threshold voltage Negative-going input threshold voltage Input hy