SLLSF22H April   2018  – June 2024 ISO1410 , ISO1412 , ISO1430 , ISO1432 , ISO1450 , ISO1452

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Description Continued
  6. 5 Device Comparison Table
  7. 6 Pin Configuration and Functions
    1.     Pin Functions: Full-Duplex Device
    2.     Pin Functions: Half-Duplex Device
  8. 7 Specifications
    1. 7.1  Absolute Maximum Ratings
    2. 7.2  ESD Ratings
    3. 7.3  Recommended Operating Conditions
    4. 7.4  Thermal Information
    5. 7.5  Power Ratings
    6. 7.6  Insulation Specifications
    7. 7.7  Safety-Related Certifications
    8. 7.8  Safety Limiting Values
    9. 7.9  Electrical Characteristics: Driver
    10. 7.10 Electrical Characteristics: Receiver
    11. 7.11 Supply Current Characteristics: Side 1 (ICC1)
    12. 7.12 Supply Current Characteristics: Side 2 (ICC2)
    13. 7.13 Switching Characteristics: Driver
    14. 7.14 Switching Characteristics: Receiver
    15. 7.15 Insulation Characteristics Curves
    16. 7.16 Typical Characteristics
  9. 8 Parameter Measurement Information
  10. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1 Electromagnetic Compatibility (EMC) Considerations
      2. 9.3.2 Failsafe Receiver
      3. 9.3.3 Thermal Shutdown
      4. 9.3.4 Glitch-Free Power Up and Power Down
    4. 9.4 Device Functional Modes
      1. 9.4.1 Device I/O Schematics
  11. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Application
      1. 10.2.1 Design Requirements
      2. 10.2.2 Detailed Design Procedure
        1. 10.2.2.1 Data Rate and Bus Length
        2. 10.2.2.2 Stub Length
        3. 10.2.2.3 Bus Loading
      3. 10.2.3 Application Curves
        1. 10.2.3.1 Insulation Lifetime
  12. 11Power Supply Recommendations
  13. 12Layout
    1. 12.1 Layout Guidelines
      1. 12.1.1 PCB Material
    2. 12.2 Layout Example
  14. 13Device and Documentation Support
    1. 13.1 Documentation Support
      1. 13.1.1 Related Documentation
        1. 13.1.1.1 Related Links
    2. 13.2 Receiving Notification of Documentation Updates
    3. 13.3 Support Resources
    4. 13.4 Trademarks
    5. 13.5 Electrostatic Discharge Caution
    6. 13.6 Glossary
  15. 14Revision History
  16. 15Mechanical, Packaging, and Orderable Information

9.4 Device Functional Modes

Table 9-1 shows the driver functional modes.

Table 9-1 Driver Functional Table
VCC1(1)VCC2(1)INPUT DDRIVER ENABLE DEOUTPUTS(3)
Y, AZ, B
PUPUHHHL
LHLH
XLHi-ZHi-Z
XOpenHi-ZHi-Z
OpenHHL
PD(2)PUXXHi-ZHi-Z
XPDXXHi-ZHi-Z
(1) PU = Powered Up; PD = Powered Down; H = High Level; L = Low level; X = Irrelevant, Hi-Z = High impedance state
(2) A strongly driven input signal can weakly power the floating VCC1 through an internal protection diode and cause an undetermined output.
(3) The driver outputs are Y and Z for a full-duplex device. The driver outputs are A and B for a half-duplex device.

The description that follows is specific to half-duplex device but the same logic applies to full-duplex device with the outputs being Y and Z.

When the driver enable pin, DE, is logic high, the differential outputs, A and B, follow the logic states at data input, D. A logic high at the D input causes the A output to go high and the B output to go low. Therefore the differential output voltage defined by Equation 1 is positive.

Equation 1. VOD = VA – VB

A logic low at the D input causes the B output to go high and the A output to go low. Therefore the differential output voltage defined by Equation 1 is negative. A logic low at the DE input causes both outputs to go to the high-impedance (Hi-Z) state. The logic state at the D pin is irrelevant when the DE input is logic low. The DE pin has an internal pulldown resistor to ground. The driver is disabled (bus outputs are in the Hi-Z) by default when the DE pin is left open. The D pin has an internal pullup resistor. The A output goes high and the B output goes low when the D pin is left open while the driver enabled.

Table 9-2 shows the receiver functional modes.

Table 9-2 Receiver Functional Table
VCC1(1)VCC2(1)DIFFERENTIAL INPUTRECEIVER ENABLE REOUTPUT R
VID = VA – VB
PUPU–0.02 V ≤ VIDLH
–0.2 V < VID < 0.02 VLIndeterminate
VID≤ –0.2 VLL
XHHi-Z
XOpenHi-Z
Open, Short, IdleLH
PD(2)PUXXHi-Z
PUPDXLH
PD(2)PDXXHi-Z
(1) PU = Powered Up; PD = Powered Down; H = Logic High; L= Logic Low; X = Irrelevant, Hi-Z = High Impedance (OFF) state
(2) A strongly driven input signal can weakly power the floating VCC1 through an internal protection diode and cause an undetermined output.

The receiver is enabled when the receiver enable pin, RE, is logic low. The receiver output, R, goes high when the differential input voltage defined by Equation 2 is greater than the positive input threshold, VTH+.

Equation 2. VID = VA – VB

The receiver output, R, goes low when the differential input voltage defined by Equation 2 is less than the negative input threshold, VTH–. If the VID voltage is between the VTH+ and VTH– thresholds, the output is indeterminate. The receiver output is in the Hi-Z state and the magnitude and polarity of VID are irrelevant when the RE pin is logic high or left open. The internal biasing of the receiver inputs causes the output to go to a failsafe-high when the transceiver is disconnected from the bus (open-circuit), the bus lines are shorted to one another (short-circuit), or the bus is not actively driven (idle bus).