ZHCSQ45A january 2023 – july 2023 THVD1454
PRODUCTION DATA
- 1
- 1 特性
- 2 应用
- 3 说明
- 4 Revision History
- 5 Pin Configuration and Functions
-
6 Specifications
- 6.1 Absolute Maximum Ratings
- 6.2 ESD Ratings
- 6.3 ESD Ratings [IEC]
- 6.4 Recommended Operating Conditions
- 6.5 Thermal Information
- 6.6 Power Dissipation
- 6.7 Electrical Characteristics
- 6.8 Switching Characteristics_500 kbps
- 6.9 Switching Characteristics_20 Mbps
- 6.10 Switching Characteristics_Termination resistor
- 6.11 Typical Characteristics
- 7 Parameter Measurement Information
- 8 Detailed Description
- 9 Application Information Disclaimer
- 10Device and Documentation Support
- 11Mechanical, Packaging, and Orderable Information
8.4.1 On-Chip Switchable Termination
THVD1454 has integrated termination resistor of nominal 120 Ω across A/B bus terminals. Termination resistor is enabled or disabled using the TERM pin described in Table 8-3.
| Signal state | Function | Comments |
|---|---|---|
| TERM = VCC | 120 Ω enabled between A and B | |
| TERM = GND or floating | 120 Ω disabled between A and B | Termination is disabled by default |
On-chip 120 Ω termination resistor variation with temperature and across common mode voltage is shown in Figure 8-1 and Figure 8-2.
Figure 8-1 Termination Resistor vs
Temperature
Figure 8-2 Termination Resistor vs
Bus Common Mode voltageTHVD1454 on-chip termination resistor has been designed so the termination block offers a resistive load to the bus, and does not alter the magnitude or phase of the bus signals from DC to 20Mbps signaling. See Figure 8-3 and Figure 8-4 with the bus voltage swept from -6 V to +6 V. Current into the bus changes linearly in both conditions of termination ON or OFF.
Figure 8-3 Voltage vs Current Across
AB Bus Pins with Termination OFF
Figure 8-4 Voltage vs Current Across
AB Bus Pins with Termination ON