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THVD4431 Multiprotocol (RS-232, RS-422, RS485) Transceiver with Integrated 120-Ω Switchable Termination Resistor and IEC-ESD Protection
SLLSFS1B
August 2023 – April 2024
THVD4431
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THVD4431 Multiprotocol (RS-232, RS-422, RS485) Transceiver with Integrated 120-Ω Switchable Termination Resistor and IEC-ESD Protection
1
1
Features
2
Applications
3
Description
4
Pin Configuration and Functions
5
Specifications
5.1
Absolute Maximum Ratings
5.2
ESD Ratings
5.3
ESD Ratings [IEC]
5.4
Recommended Operating Conditions
5.5
Thermal Information
5.6
Power Dissipation
5.7
Electrical Characteristics
5.8
Switching Characteristics_RS-485_500kbps
5.9
Switching Characteristics_RS-485_20Mbps
5.10
Switching Characteristics, Driver_RS232
5.11
Switching Characteristics, Receiver_RS232
5.12
Switching Characteristics_MODE switching
5.13
Switching Characteristics_RS-485_Termination resistor
5.14
Switching Characteristics_Loopback mode
5.15
Typical Characteristics
6
Parameter Measurement Information
7
Detailed Description
7.1
Overview
7.2
Functional Block Diagrams
7.3
Feature Description
7.3.1
Integrated IEC ESD and EFT Protection
7.3.2
Protection Features
7.3.3
RS-485 Receiver Fail-Safe Operation
7.3.4
Low-Power Shutdown Mode
7.3.5
On-chip Switchable Termination Resistor
7.3.6
Operational Data Rate
7.3.7
Diagnostic Loopback
7.3.8
Integrated Charge pump for RS-232
7.4
Device Functional Modes
7.4.1
RS-485 Functionality
7.4.2
RS-232 Functionality
7.4.3
Mode Control
8
Application and Implementation
8.1
Application Information
8.2
Typical Application
8.2.1
Design Requirements
8.2.1.1
Data Rate and Bus Length for RS-485
8.2.1.2
Stub Length for RS-485 Network
8.2.1.3
Bus Loading for RS-485 Network
8.2.2
Detailed Design Procedure
8.2.3
Application Curves
8.3
Power Supply Recommendations
8.4
Layout
8.4.1
Layout Guidelines
8.4.2
Layout Example
9
Device and Documentation Support
9.1
Device Support
9.1.1
Third-Party Products Disclaimer
9.2
Receiving Notification of Documentation Updates
9.3
Support Resources
9.4
Trademarks
9.5
Electrostatic Discharge Caution
9.6
Glossary
10
Revision History
11
Mechanical, Packaging, and Orderable Information
IMPORTANT NOTICE
Package Options
Mechanical Data (Package|Pins)
RHA|40
MPQF135D
Thermal pad, mechanical data (Package|Pins)
RHA|40
QFND740
Orderable Information
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Data Sheet
THVD4431 Multiprotocol (RS-232, RS-422, RS485) Transceiver with Integrated
120-Ω Switchable Termination Resistor and IEC-ESD Protection
1
Features
Meets or exceeds the requirements of the TIA/EIA-485A and TIA/EIA-232F standards
3 transmitters, 5 receivers for RS-232
1 transmitter, 1 receiver for RS-485
On-chip switchable 120Ω termination resistor for RS-485 mode
Integrated charge-pump for RS-232 signaling
3V to 5.5V supply voltage
1.65V to 5.5V supply for logic data and control signals
RS-485 differential output exceeds 2.1V for PROFIBUS compatibility with 5V supply
Large output swing (typical ± 9V) for RS-232 mode
SLR Pin Selectable Data Rates:
RS-232 3T5R mode: 250kbps and 1Mbps
RS-485 half-duplex and full-duplex mode: 500kbps and 20Mbps
Bus I/O protection
±16kV HBM ESD
±8kV IEC 61000-4-2 contact and ±15kV air-gap discharge
±4kV IEC 61000-4-4 fast transient burst
Diagnostic loopback for both RS-232 and RS-485 modes
Shutdown pin for low current consumption (10µA typical) in disabled state
Glitch-free power-up/down for hot plug-in capability
1/8 unit load (up to 256 bus nodes) for RS-485
Open, short, and idle bus failsafe for RS-485 receiver
Bus short-circuit protection, thermal shutdown
Extended ambient temperature range: -40°C to 125°C
Space-saving thermally efficient 6mm x 6mm VQFN-40 package
2
Applications
Industrial PC
Factory automation and control
HVAC systems
Building automation
Point-of-sale terminals
Grid infrastructure
Industrial Transport