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Diamond Point International

Aitech S703 - Radiation Tolerant Dual MIL-STD-1553 PMC

One MIL-STD-1553B Dual Redundant BC/RT/MT (STANAG 3838 Compliant) Channel


Aitech’s S703 MIL-STD-1553B PMC features one BU61688 Mini-Advanced Communication Engine or a BU61582 SpaceACE hybrid by DDC. Each terminal provides dual transceiver and encoder/decoder, complete MIL-STD-1553B protocol, 16k 16-bit words of shared RAM, and memory management logic for all three modes (BC/RT/MT). Background Mode Operation prevents inadvertent access to the card during power-on self-test. On-board Interrupt Mask and Interrupt Status Registers support flexible operation for both interrupt and polling applications.

The memory management scheme for RT mode provides an option for separation of broadcast data plus a circular buffer option for individual RT sub-addresses to off-load the demands on the PC host processor.The S703’s PCI interface provides bridging capabilities between the carrier board PCI bus and the local MIL-STD-1553B controller bus. The Bridge supports a 32-bit wide PCI bus clocked at 33.333 MHz. ThePCI Local Bus is compliant to Rev. 2.1 specifications.

The S703 interface to the MIL-STD-1553B bus is either for transformer (long stub) or direct (short stub) coupling. Each S703 terminal/channel pair can be switched to use either transformer or direct coupling according to the factory installed configuration (transformer coupling by default). Both, transformer and direct-coupling configurations require the use of an isolation transformer located on the S703 PMC. For the (long stub) transformer-coupled configuration, a second transformer (referred to as a bus-coupling transformer) is required, in accordance with MIL-STD-1553B.

In addition, both coupling configurations require an isolation resistor to be placed in series with each leg of the transformer connecting to the MIL-STD-1553B bus. This design protects the bus against short circuit conditions in the transformers, stubs, or terminal components.

The four optional UART ports configured in baud rates from 9600 bps to 115.2 kbps and each port comes with independent transmit and receive buffers. All buffers are 64 bytes with tyCo VxWorks implementation.



Features• Designed to Operate and Host on the S950 Single Board Computer (SBC)
• Three (3) SpaceWire Full Duplex Ports – All Three (3) Ports are Brought Out of the Front Panel in the 100-series Engineering Model
• SpaceWire Ports are ESA ECSS-E-50-12C Compliant
• DMA Engine for Data Transfer To and From the SBC via the Local PCI Bus
• Each SpaceWire Port can be Enabled or Disabled Independently
• Each SpaceWire Port can Independently Receive and Transmit Packets to the SBC
• Each SpaceWire Port can be Configured with Selectable Clock Frequencies of up to 100 MHz
• Timecode can be Responded to or Generated by each SpaceWire Port
• Rear I/O via the SBC to the CompactPCI Backplane for the Conduction-Cooled Configuration
• 32-bit PCI 2.2 Compliant PCI Master/Slave Interface at 33.333 MHz
• Nominal Power Consumption is Estimated at Less Than 5 Watts (for SpaceWire only)
• Designed to Operate with a Minimum TID of Over 100 krad (Si) in the Flight Model


Expansion32-bit PCI 2.1 compliant cPCI interface at 33.333 MHz
ElectricalThe S730 draws most of its power from +3.3Vdc
• +3.3V (±5%) 1.5 A (typical)
• +5V (±5%) 0 A (typical)
MechanicalThe S730 is available in a conduction cooled form factor per ANSI/VITA20-2001 for installation on top of the S950 or CM950.
Conformal CoatingConformal optional (series 100), standard (series 200/500). Acrylic or Silicone
SoftwareN/A - transparent to operating system
TemperatureSeries-100 Lab Grade EDU
• Temperature range (operation): 0 to +55°C
• Temperature range (storage): -40 to +85°C

Series-200 Qual Unit
• Temperature range (operation): -40 to +71°C
• Temperature range (storage): -50 to +100°C

Series-500 Radiation Tolerant Flight Unit
• Temperature range (operation): -40 to +65°C (space vacuum)
• Temperature range (storage): -62 to +125°C

Ruggedization level is determined in the part numbering scheme - refer to datasheet for further details
HumiditySeries-100 Lab Grade EDU: 0-90%
Series-200 Qual Unit: 0-100% (coating as standard)
Series-500 Radiation Tolerant Flight Unit: 0-100% (coating as standard)
AltitudeSeries-100 Lab Grade EDU: 15,000ft
Series-200 Qual Unit: 70,000ft
Series-500 Radiation Tolerant Flight Unit: 10 to the -4 Torr
VibrationSeries-100 Lab Grade EDU:
• Random (g2/Hz): 20-2000Hz/0.02 g2/Hz
• Sine (g PEAK): 10-100Hz/2g

Series-200 Qual Unit:
• Random (g2/Hz): 20-2000Hz/0.1 g2/Hz
• Sine (g PEAK): 50-500Hz/10g

Series-500 Radiation Tolerant Flight Unit:
• Conduction-cooled: Random (g2/Hz): 20-2000Hz/0.1 g2/Hz
• Conduction-cooled: Sine (g PEAK): 50-500Hz/10g
ShockSeries-100 Lab Grade EDU: 20g/6mS
Series-200 Qual Unit: 40g/11ms, 100g/6ms
Series-500 Radiation Tolerant Flight Unit: 40g/11ms, 100g/6ms (pyro-shock 875g)
Warranty1 Year

Ordering Details

BoardRefer to datasheet for ordering part number scheme