HI-15850

The HI-15850 is an ultra-low power CMOS dual transceiver designed to meet the requirements of the MIL-STD-1553 and MIL-STD-1760 specifications.

The device features 1.8V, 2.5V and 3.3V compatible digital I/O, which gives users more flexibility to interface with a broad range of FPGAs, avoiding the use of level shifters and other additional circuitry.

This new device is based on Holt’s popular HI-1585, providing the same unique features of bus tail-off compensation and receiver output pulse extension. Tail-off compensation provides a means to actively compensate for bus tail-off, which is an undesirable temporary DC offset on the terminal’s bus stub resulting from non-optimal board design and layout. The receiver output pulse extension feature ensures receiver output pulse widths remain above 180ns, improving receiver sensitivity for designs operating close to the minimum receiver input response amplitude and ensuring proper decoding.

The transmitter section of each bus takes complementary CMOS / TTL Manchester II bi-phase data and converts it to differential voltages suitable for driving the bus isolation transformer. Separate transmitter inhibit control signals are provided for each transmitter. The receiver section of the each bus converts the 1553 bus bi-phase analogue signals to complementary CMOS / TTL data suitable for input to a Manchester decoder. Each receiver has a separate enable input, which forces the receiver outputs to the bus idle state (logic '0') when disabled.

The device is packaged in the industries smallest MIL-STD-1553 transceiver package, a 48-pin plastic 6mm x 6mm QFN with an exposed heat sink pad, which may be soldered to the PCB ground plane for optimal thermal dissipation. The device is available in industrial −40oC to +85oC and extended −55oC to +125oC temperatures, with optional burn-in available on the extended temperature range.