MA28139 Datasheet - Dynex

MA28139 OBDH Bus Terminal

In RT mode, power up resets the OBT and causes it to deselect both busses. Two watchdog counters monitor the Nominal l-bus and the Redundant l-bus. If either bus becomes active, that bus will be selected. If the selected bus stops, the OBT watchdog times out and resets both the OBT and the user. If .

MA28139 MA28139 OBDH Bus Terminal Replaces June 1999 version, DS3592-5.0 DS3592-6.0 January 2000 The OBT ASIC will interface any user to the ESA On Board Data Handling bus. Developed under ESA Contract, it conforms to ESA OBDH, Digital Bus Interface and Internal User Bus Standards. The OBT has 2 separate functions. The first is a 5 channel modem which, on the bus side, provides the digital waveforms necessary to operate the Litton Bus drivers, and receives the outputs of the Litton bus detecto.

MA28139 Features

* s Radiation Hard s Low Power Consumption s Single CMOS-SOS ASIC Implementation s Latch-up Free s High SEU Immunity s Fully Compliant with ESA OBDH, IUB, DBI and RBI Specification s Contains OBDH Bus Modem and RTU Kernel s Supports Bi-directional Data Transfer on Response and Block Transfer Bus CONF

MA28139_DynexSemiconductor.pdf