SLLSFS1B August   2023  – April 2024 THVD4431

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1  Absolute Maximum Ratings
    2. 5.2  ESD Ratings
    3. 5.3  ESD Ratings [IEC]
    4. 5.4  Recommended Operating Conditions
    5. 5.5  Thermal Information
    6. 5.6  Power Dissipation
    7. 5.7  Electrical Characteristics
    8. 5.8  Switching Characteristics_RS-485_500kbps
    9. 5.9  Switching Characteristics_RS-485_20Mbps
    10. 5.10 Switching Characteristics, Driver_RS232
    11. 5.11 Switching Characteristics, Receiver_RS232
    12. 5.12 Switching Characteristics_MODE switching
    13. 5.13 Switching Characteristics_RS-485_Termination resistor
    14. 5.14 Switching Characteristics_Loopback mode
    15. 5.15 Typical Characteristics
  7. 6 Parameter Measurement Information
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagrams
    3. 7.3 Feature Description
      1. 7.3.1 Integrated IEC ESD and EFT Protection
      2. 7.3.2 Protection Features
      3. 7.3.3 RS-485 Receiver Fail-Safe Operation
      4. 7.3.4 Low-Power Shutdown Mode
      5. 7.3.5 On-chip Switchable Termination Resistor
      6. 7.3.6 Operational Data Rate
      7. 7.3.7 Diagnostic Loopback
      8. 7.3.8 Integrated Charge pump for RS-232
    4. 7.4 Device Functional Modes
      1. 7.4.1 RS-485 Functionality
      2. 7.4.2 RS-232 Functionality
      3. 7.4.3 Mode Control
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
        1. 8.2.1.1 Data Rate and Bus Length for RS-485
        2. 8.2.1.2 Stub Length for RS-485 Network
        3. 8.2.1.3 Bus Loading for RS-485 Network
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 Application Curves
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Device Support
      1. 9.1.1 Third-Party Products Disclaimer
    2. 9.2 Receiving Notification of Documentation Updates
    3. 9.3 Support Resources
    4. 9.4 Trademarks
    5. 9.5 Electrostatic Discharge Caution
    6. 9.6 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

4 Pin Configuration and Functions

Figure 4-1 40-Pin VQFN Package (RHA)
Top View
Table 4-1 Pin Functions
NAME NO. TYPE DESCRIPTION
L1 1 O Logic output (RS-232)
L2 2 O Logic output (RS-232/RS-485)
L3 3 I Logic input (RS-232/RS-485). Integrated weak pull-up resistor .
L4 4 I Logic input. Integrated weak pull-up resistor
L5 5 O Logic output
L6 6 I Logic input, Integrated weak pull-up resistor
L7 7 O Logic output
L8 8 O Logic output
VIO 9 P 1.65 V to 5.5 V logic supply voltage
GND(1) 10 G Ground
SLR 11 I Slew rate control, internal pull-down resistor. SLR=H enables slow speed
DIR 12 I RS-485 TX/RX enable/disable. Internal pull-down resistor.
MODE2 13 I MODE control pins, Integrated weak pull-down resistor
MODE0 14 I
MODE1 15 I
NC 16 NC Not connected internally. Can be connected to supply, ground or left open on PCB.
TERM_TX 17 I 120 Ω Termination enable/disable across R1/R2 terminals. Internal Pull down resistor
TERM_RX 18 I 120 Ω Termination enable/disable across R3/R4 terminals. Internal Pull down resistor
SHDN 19 I Device enable/disable. Internal pull-down resistor
VCC 20 P 3 to 5.5V supply voltage
R8 21 I RS-232 receiver input
R7 22 I RS-232 receiver input
GND(1) 23 G Ground
R6 24 O RS-232 driver output
R5 25 I RS-232 receiver input
GND 26 G Ground
R4 27 I/O RS-232 driver output or RS-485 inverting receiver input (B)
R3 28 I/O RS-232 driver output or RS-485 non-inverting receiver input (A)
GND(1) 29 G Ground
R2 30 I/O RS-232 receiver input or RS-485 bus pin (Y or A)
R1 31 I/O RS-232 receiver input or RS-485 bus pin (Z or B)
VCC 32 P 3 to 5.5 V supply voltage
V- 33 Negative charge pump rail
C2- 34 Negative terminal of charge pump capacitor
C1- 35 Negative terminal of charge pump capacitor
NC 36 NC Not connected internally. Can be left open or Grounded on PCB.
C1+ 37 Positive terminal of charge pump capacitor
VCC 38 P 3 to 5.5V supply voltage
C2+ 39 Positive terminal of charge pump capacitor
V+ 40 Positive charge pump rail
(1) GND pins 10, 23, 26, 29 all must be grounded on PCB.