SLLSEF1B September 2013 – August 2015 ISO7142CC
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.
ISO7142CC uses single-ended TTL-logic switching technology. Its supply voltage range is from 2.7 V to 5.5 V for both supplies, VCC1 and VCC2. When designing with digital isolators, it is important to note that due to the single-ended design structure, digital isolators do not conform to any specific interface standard and are only intended for isolating single-ended CMOS or TTL digital signal lines. The isolator is typically placed between the data controller (that is, µC or UART), and a data converter or a line transceiver, regardless of the interface type or standard.
Typical isolated RS-232 interface implementation is shown in Figure 14.
Unlike optocouplers, which require external components to improve performance, provide bias, or limit current, ISO7142CC only requires two external bypass capacitors to operate.
Figure 15 shows the hookup of a typical ISO7142CC circuit. The only external components are two bypass capacitors.