SCDS247B October 2008 – February 2016 TS12A44513 , TS12A44514 , TS12A44515
PRODUCTION DATA.
8 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality.
8.1 Application Information
The switches are bidirectional, so the NO, NC, and COM pins can be used as either inputs or outputs.
8.1.1 Logic-Level Thresholds
The logic-level thresholds are CMOS/TTL compatible when VCC is 5 V. As VCC is raised, the level threshold increases slightly. When VCC reaches 12 V, the level threshold is about 3 V – above the TTL-specified high-level minimum of 2.8 V, but still compatible with CMOS outputs.
CAUTION
Do not connect the TS12A44513/TS12A44514/MAS4515 VCC to 3 V and then connect the logic-level pins to logic-level signals that operate from 5-V supply. Output levels can exceed 3 V and violate the absolute maximum ratings, damaging the part and/or external circuits.
8.2 Typical Application
Figure 9. Typical Application Schematic
8.2.1 Design Requirements
Ensure that all of the signals passing through the switch are with in the specified ranges to ensure proper performance.
Table 2. Design Parameters
| MIN | MAX | UNIT | ||
|---|---|---|---|---|
| VCC | 0 | 12 | V | |
| VNC, VNO, VCOM, VIN | 0 | VCC | V | |
8.2.2 Detailed Design Procedure
The TS12A4451x can be properly operated without any external components. However, it is recommended that unused pins be connected to ground through a 50-Ω resistor to prevent signal reflections back into the device. It is also recommended that the digital control pins (INX) be pulled up to VCC or down to GND to avoid undesired switch positions that could result from the floating pin.
8.2.3 Application Curve
Figure 10. ON-State Resistance, RON vs Analog Signal, VCOM