1879BA1AT MIL-STD-1553B Interface Terminal

1879BA1АT (replacement 1879ВА1Т) interface terminal provides complete, flexible interface between host processor and MIL-STD-1553B redundant data bus via external transceivers, implementing Bus Controller (BC), Remote Terminal (RT), Monitor Terminal (MT) or simultaneous RT/MT modes.



1879BA1AT integrate encoder/decoder, complete BC/RT/MT multi-protocol logic, interrupt logic, control logic, memory management and processor interface logic, and 4K words of internal buffered SRAM. 1879BA1AT may use up to 64K words of external SRAM at DMA configuration. 1879BA1AT may be interfaced both to 16-bit and 8-bit microprocessors at shared memory mode. 1879BA1AT runs at either 16 or 12 MHz software programmable clock rate.

1879BA1AT BC and RT protocols implements all MIL-STD-1553B message formats, providing flexible interface to CPU and many advanced features. 1879BA1AT implement three MT modes: word monitor, selective message monitor, simultaneous RT/message monitor, with trigger options.

1879BA1AT require only single +3.3V power supply, provide CMOS output levels and have 5V-tolerant inputs. 1879BA1AT comply with both Harris-compatible and Smiths-compatible MIL-STD-1553B data bus transceivers. 1879BA1AT packaged at 14 x 14 mm 80-pin plastic LQFP with 0.5 mm pitch and have maximum height 1.7 mm that is well suited for applications with stringent height requirements.

Designed by RC MODULE devices 1553 terminals with 1879BA1AT and various models of data bus transceivers were fully tested to compliance with MIL-STD-1553B requirements at S.P.Korolev RSC ENERGIA test house.


  • Complete integrated interface between host processor and MIL-STD-1553B data bus via external transceivers
  • BC, RT, MT, simultaneous RT/MT modes
  • 4Kx16 internal RAM, externally expanded to 64Kx16
  • Flexible processor/memory interface:
    • 8- or 16-bit buffered mode
    • 16-bit transparent mode
    • 16-bit DMA mode
    • supports "Zero Wait" mode
  • 16/12 MHz programmable clock rate
  • Advanced BC features:
    • automatic retries
    • programmable gap times
    • frame auto-repeat
    • programmable response time-out
  • Advanced RT features:
    • programmable illegalization
    • choice of single message mode, double buffering mode, and circular buffering mode
    • interrupts on individual mode codes
    • flexible data buffering
  • Advanced MT features:
    • word monitor mode
    • selective message monitor mode
    • simultaneous RT/message monitor mode
    • trigger options
  • Single +3.3V power supply, 5V-tolerant inputs
  • 14 x 14 mm 80-pin LQFP package

Functional Diagram


Interfacing of host processors to MIL-STD-1553B redundant data bus at avionics and other mission-critical applications, development of hardware and software test systems



Parameter Min Typ Max Units
Absolute Maximum Rating        
Supply Voltage - 0,4   4,0 V
Input Voltage - 0,5   6,0 V
Output Current - 13   13 mA
Power Supply        
Supply Voltage (VDD) 3,0 3,3 3,6 V
Supply Current     200 mA
Load Capacitance        
Output & Bi-directional Load Capacitance     50 pF
Logic(VSS = 0V)        
H-level Input Voltage 2,0   5,5 V
L-level Input Voltage VSS   0,8 V
Input Leakage Current - 10   10 µA
H-level Output Voltage VDD - 0,5   VDD V
L-level Output Voltage VSS   0,4 V
Output Current - 4   4 mA
1553 Message Timing        
Completion of CPU Write (BC Start to Start of Next Message)   2,5   µs
BC Intermessage Gap (Software Programmable) 9,5   65535 µs
BC/RT/MT Response Timeout:        
- 18,5 Nominal 17,5   19,5 µs
- 22,5 Nominal 21,5   23,5 µs
- 50,5 Nominal 49,5   51,5 µs
- 128,0 Nominal 127,0   131,0 µs
RT Response Time 4,8   7,3 µs
Transmitter Watchdog Timeout   668   µs
Physical Characteristics        
Size (maximum values) 14,2 x 14,2 x 1,7 mm
Weight (maximum value) 0,47 g