The Vishay TFBS6614 is the lowest profile (2.7 mm) 4 Mbit/s Infrared Data Transceiver module available. A photo PIN diode, an infrared emitter (IRED) and a low-power CMOS control IC are integrated in a single package that provides a total front-end solution. VLOGIC - allows a low-voltage controller to connect directly to TxD, RxD and SD/Mode logic signals of the transceiver hence eliminating the need for costly signal level converter and reducing power consumption. The TxD-echo function is enabled for internal selftest. During transmission the TxD signals are echoed at RxD output to perform the internal self-test. The Shut Down (SD) feature cuts current consumption to less than 10 nA.