SLLSFS0A April   2024  – May 2025 THVD4421

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 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
        2. 8.2.1.2 Stub Length
        3. 8.2.1.3 Bus Loading
      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
    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

4 Pin Configuration and Functions

THVD4421 THVD442132-Pin VQFN Package (RHB)Top View Figure 4-1 THVD4421
32-Pin VQFN Package (RHB)
Top View
Table 4-1 Pin Functions
NAME NO. TYPE DESCRIPTION
VCC 1 P 3V to 5.5V supply voltage
L1 2 O Logic output
L2 3 O Logic output (RS-232/RS-485). External Pull up resistor is recommended
L3 4 I Logic input (RS-232/RS-485)
L4 5 I Logic input
NC 6 Not connected internally. Can be left open or Grounded on PCB.
NC 7
GND(1) 8 G Ground
SLR 9 I Slew rate control, internal pull-down. SLR=H enables slow speed (250kbps for RS-232, 500kbps for RS-485)
DIR 10 I RS-485 TX/RX enable/disable. Internal pull-down
MODE0 11 I MODE control pins
MODE1 12 I
VIO 13 P 1.65V to 5.5V logic supply voltage
TERM_TX 14 I 120Ω Termination enable/disable across R1/R2 terminals. Internal Pull down
TERM_RX 15 I 120Ω Termination enable/disable across R3/R4 terminals. Internal Pull down
SHDN 16 I Device enable/disable. Internal pull-down
VCC 17 P 3V to 5.5V supply voltage
R4 18 I/O RS-232 driver output or RS-485 inverting receiver input (B)
R3 19 I/O RS-232 driver output or RS-485 non-inverting receiver input (A)
GND(1) 20, 21 G Ground
NC 22 Not connected internally. Can be left open or Grounded on PCB.
R2 23 I/O RS-232 receiver input or RS-485 bus pin (Y or A)
R1 24 I/O RS-232 receiver input or RS-485 bus pin (Z or B)
VCC 25 P 3V to 5.5V supply voltage
V- 26 Negative charge pump rail
C2- 27 Negative terminal of charge pump capacitor
C1- 28 Negative terminal of charge pump capacitor
C1+ 29 Positive terminal of charge pump capacitor
VCC 30 P 3V to 5.5V supply voltage
C2+ 31 Positive terminal of charge pump capacitor
V+ 32 Positive charge pump rail
(1) GND pins 8, 20, 21 all must be grounded on PCB.