SN75176A Differential Bus Transceiver

1 Product Order Technical Tools & Support &. Folder Now Documents Software Community SN75176A . SLLS100B JUNE 1984 REVISED JANUARY 2015. SN75176A Differential Bus Transceiver 1 Features The SN75176A combines a 3-state Differential line driver and a Differential input line receiver, both of . 1 Bidirectional Transceiver which operate from a single 5-V power supply. The Meets or Exceeds the Requirements of ANSI driver and receiver have active- high and active-low Standards EIA/TIA-422-B and ITU enables, respectively, that can be externally Recommendations connected together to function as a direction control. Designed for Multipoint Transmission on Long Bus The driver Differential outputs and the receiver Lines in Noisy Environments Differential inputs are connected internally to form Differential input/output (I/O) bus ports that are 3-State Driver and Receiver Outputs designed to offer minimum loading to the bus Individual Driver and Receiver Enables whenever the driver is disabled or VCC = 0.

2 These Wide Positive and Negative Input/Output Bus ports feature wide positive and negative common- voltage Ranges mode voltage ranges making the device suitable for party-line applications. Driver Output Capability 60 mA Max Thermal-Shutdown Protection The driver is designed to handle loads up to 60 mA of sink or source current. The driver features positive- Driver Positive-Current Limiting and Negative- and negative-current limiting and thermal shutdown Current Limiting for protection from line fault conditions. Thermal Receiver Input Impedance 12 k Min shutdown is designed to occur at a junction Receiver Input Sensitivity 200 mV temperature of approximately 150 C. The receiver features a minimum input impedance of 12 k , an Receiver Input Hysteresis 50 mV Typ input sensitivity of 200 mV, and a typical input Operates From Single 5-V Supply hysteresis of 50 mV. Lower Power Requirements The SN75176A can be used in transmission-line applications employing the SN75172 and SN75174.

3 2 Applications quadruple Differential line drivers and SN75173 and Low Speed RS485 communication (5 Mbps or SN75175 quadruple Differential line receivers. less) The SN75176A is characterized for operation from For 10 Mbps, use SN75176B 0 C to 70 C. 3 Description Device Information(1). PART NUMBER PACKAGE (PIN) BODY SIZE (NOM). The SN75176A Differential bus Transceiver is a monolithic integrated circuit designed for bidirectional SOIC (8) mm mm SN75176A . data communication on multipoint bus-transmission PDIP (8) mm mm lines. It is designed for balanced transmission lines (1) For all available packages, see the orderable addendum at and meets ANSI Standard EIA/TIA-422-B and ITU the end of the datasheet. Recommendation Simplified Schematics 1. An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers.

4 PRODUCTION DATA. SN75176A . SLLS100B JUNE 1984 REVISED JANUARY 2015 Table of Contents 1 Features .. 1 Overview .. 11. 2 Applications .. 1 Functional Block Diagrams .. 11. 3 Description .. 1 Feature 12. Device Functional 12. 4 Revision 2. 5 Pin Configuration and Functions .. 3 9 Application and Implementation .. 13. Application 13. 6 4. Typical Application .. 13. Absolute Maximum Ratings .. 4. ESD 4 10 Power Supply Recommendations .. 14. Recommended Operating 4 11 15. Thermal Information .. 4 Layout Guidelines .. 15. Electrical Characteristics Driver .. 5 Layout Example .. 15. Electrical Characteristics Receiver .. 5 12 Device and Documentation Support .. 15. Switching Characteristics Driver .. 6 Trademarks .. 15. Switching Characteristics 6 Electrostatic Discharge Caution .. 15. Typical Characteristics .. 6 Glossary .. 15. 7 Parameter Measurement Information .. 8 13 Mechanical, Packaging, and Orderable 8 Detailed Description.

5 11 Information .. 15. 4 Revision History Changes from Revision May (1995) to Revision B Page Added Applications, Device Information table, Pin Functions table, ESD Ratings table, Thermal Information table, Typical Characteristics, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information section.. 1. Deleted Ordering Information table.. 1. 2 Submit Documentation Feedback Copyright 1984 2015, Texas Instruments Incorporated Product Folder Links: SN75176A . SN75176A . SLLS100B JUNE 1984 REVISED JANUARY 2015. 5 Pin Configuration and Functions Pin Functions PIN. TYPE DESCRIPTION. NAME NO. R 1 O Logic Data Output from RS-485 Receiver RE 2 I Receive Enable (active low). DE 3 I Driver Enable (active high ).

6 D 4 I Logic Data Input to RS-485 Driver GND 5 Device Ground Pin A 6 I/O RS-422 or RS-485 Data Line B 7 I/O RS-422 or RS-485 Data Line VCC 8 Power Input. Connect to 5-V Power Source. Copyright 1984 2015, Texas Instruments Incorporated Submit Documentation Feedback 3. Product Folder Links: SN75176A . SN75176A . SLLS100B JUNE 1984 REVISED JANUARY 2015 6 Specifications Absolute Maximum Ratings over operating free-air temperature range (unless otherwise noted) (1). MIN MAX UNIT. VCC Supply voltage (2) 7 V. voltage range at any bus terminal 10 15 V. VI Enable input voltage V. Continuous Total power Dissipation See Table 1. TA Operating free-air temperature range 0 70 C. Tstg Storage temperature range 65 150 C. (1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions.

7 Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. (2) All voltage values, except Differential input/output bus voltage , are with respect to network ground terminal. ESD Ratings VALUE UNIT. Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001 (1) XXX. V(ESD) Electrostatic discharge Charged-device model (CDM), per JEDEC specification JESD22- YYY V. C101 (2). (1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process. (2) JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process. Recommended Operating Conditions over operating free-air temperature range (unless otherwise noted). MIN TYP MAX UNIT. VCC Supply voltage 5 V. VI or VIC voltage at any buss terminal (separately or common mode) 7 12 V. VIH high -level input voltage D, DE, and RE 2 V.

8 VIL Low-level input voltage D, DE, and RE V. VID Differential input voltage (1) 12 V. Driver 60 mA. IOH high -level output current Receiver 400 A. Driver 60. IOL Low-level output current mA. Receiver 8. TA Operating free-air temperature 0 70 C. (1) Differential -input/output bus voltage is measured at the non-inverting terminal A with respect to the inverting terminal B. Thermal Information SN75176A . THERMAL METRIC (1) D P UNIT. 8 PINS 8 PINS. R JA Junction-to-ambient thermal resistance 172 113 C/W. (1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953. Table 1. Dissipation Rating Table TA 25 C DERATING FACTOR TA = 70 C. PACKAGE. POWER RATING ABOVE TA = 25 C POWER RATING. D 725 mW mW/ C 464 mW. P 1100 mW mW/ C 704 mW. 4 Submit Documentation Feedback Copyright 1984 2015, Texas Instruments Incorporated Product Folder Links: SN75176A .

9 SN75176A . SLLS100B JUNE 1984 REVISED JANUARY 2015. Electrical Characteristics Driver over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted). PARAMETER TEST CONDITIONS MIN TYP (1) MAX UNIT. VIK Input clamp voltage II = 18 mA V. VOH high -level output voltage VIH = 2 V, VIL = V, IOH = 33 mA V. VOL Low-level output voltage VIH = 2 V, VIL = V, IOH = 33 mA V. |VOD1| Differential output voltage IO = 0 2 VOD2 V. RL = 100 , see Figure 8 2 |VOD2| Differential output voltage V. RL = 54 , see Figure 8 Change in magnitude of Differential output |VOD| V. voltage (2). VOC Common-mode output voltage (3) RL = 54 or 100 , see Figure 8 3 V. Change in magnitude of common-mode |VOC| V. output voltage (2). VO = 12 V 1. IO Output current Output disabled (4) mA. VO = 7 V IIH high -level input current VI = V 20 A. IIL Low-level input current VI = V 400 A.

10 VO = 7 V 250. IOS Short-circuit output current VO = VCC 250 mA. VO = 12 V 500. Outputs enabled 35 50. ICC Supply current (total package) No load mA. Outputs disabled 26 40. (1) All typical values are at VCC = 5 V and TA = 25 C. (2) |VOD| and D|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. (3) In ANSI Standard EIA/TIA-422-B, VOC, which is the average of the two output voltages with respect to GND, is called output offset voltage , VOS. (4) This applies for both power on and off; refer to ANSI Standard EIA/TIA-422-B for exact conditions. Electrical Characteristics Receiver over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted). PARAMETER TEST CONDITIONS MIN TYP (1) MAX UNIT. VIT+ Positive-going input threshold voltage VO = V, IO = mA V. VIT Negative-going input threshold voltage VO = V, IO = 8 mA V.