RTS 1760, RTM 1760
MIL-STD-1553/1760 Remote Terminal
KEY FEATURES:
››
Selectable MIL-STD-1553B or MIL-STD-1760
operation
››
Stand alone remote terminal with memory
››
Low power +5 volt operation
››
Dual redundant operation
››
CMOS Bus Transceivers and Protocol
››
Simple processor interface
››
Selectable autonomous wraparound
››
Hardware checksum generation
››
Optional internal memory
››
Available as PGA or Flat-pack
››
ITAR free - UK design and manufacture
The RTS/RTM 1760 CMOS Remote Terminal
is a compact integrated module compatible
with MIL-STD-1553B and McAir protocols.
The all CMOS Multi-Chip Module (MCM)
technology provides low standby power
dissipation together with a compact
footprint in PGA or surface mount (quad-flat-
pack) packages. This RTU provides a stand-
alone interface between the MIL-STD-1760
or MIL-STD-1553 Bus and the subsystem.
The module is available with (RTM1760) or
without (RTS1760) an internal 4k x 16 RAM.
2
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GENERAL DESCRIPTION
The RTS/RTM1760 is a complete dual redundant MIL-STD-
1760 or MIL-STD-1553B Remote Terminal in a single small
outline package. It is also capable of meeting the McAir
response time requirements and the optional handling of
modecode descriptor 31 as a normal subaddress. The mode
of operation is selectable using two external pins. The RTS/
RTM1760 contains two low-power monolithic transceivers
capable of providing the output voltage required for MIL-
STD-1760 (20V to 27V) together with a custom protocol
chip and an optional 4K x 16 RAM for message storage.
The custom transceiver chips are implemented in CMOS
technology providing very low power consumption
figures when not transmitting. The receiver sections of the
transceivers fully meet the requirements of MIL-STD-1553B
in terms of threshold, common mode rejection and bit error
rate when used in conjunction with the custom protocol
chip.
The custom protocol chip contains dual redundant encoder/
decoders, RT protocol logic, 32 word message buffers,
DMA controller, arbitration logic and control registers. The
internal RAM is used to separately store messages to all
valid receive, transmit and broadcast subaddresses as well
as modecode data. The complete terminal requires only a
single +5V supply.
In MIL-STD-1760 mode the RTS/RTM1760 provides selectable
automatic checksum generation and validation together
with header word/subaddress comparison on user selected
messages. Other MIL-STD-1760 features include a latch on
the RT address lines, checking to ensure that maximum
message length is 30 words and generation of the AIRPRES*
signal.
In MIL-STD-1553B mode the special MIL-STD-1760 features
are turned off and the unit functions as a standard Remote
Terminal capable of performing all specified message
formats. In both modes of operation the RTS/RTM1760
supports all 13 dual redundant modecodes. Illegalisation of
any number of receive, transmit or broadcast subaddresses
can be programmed using the 32 word Interface Control
Block. This block can also be used to select modecode
illegalisation and program interrupt generation on different
subaddress or modecode combinations. It can also be used
to select automatic checksum generation or validation
if the terminal is operating in MIL-STD-1760 mode. With
the addition of extemal circuitry (eg. a single PLD) any
combination of subaddress, T/R bit, word count/modecode
field can be declared illegal. The RTS/RTM 1760 can be easily
interfaced to 8 and 16 bit processor architectures and in 8
bit mode all multiplexing is performed internally allowing 8
and 16 bit transfers to be mixed.
In McAir mode the response time meets the required 7.0
µs
maximum. In addition subaddress 31 is allocated as a normal
subaddress rather than a modecode. It should be noted that
the databus drivers used in the RTS/RTM1760 conform to
the requirements of MIL-STD-1553B and MIL-STD-1760 and
not to those of McAir.
RECOMMENDED OPERATING CONDITIONS
PARAMETER
Supply voltage (V
CCA
, V
CCB
, V
CCC
,
V
CCD
)
High level input voltage V
ih
Low level input voltage V
il
High level output voltage V
oh
Low level output current I
ol
Operating Case Temperature Range
-55
MIN
4.5
2.2
0.7
V
CCC
4
125
MAX
5.5
UNIT
V
DC
V
V
V
mA
Deg. C
POWER SUPPLY CURRENTS
PARAMETER
I
CCA
or I
CCB
Transmit 25% duty cycle
150
20
5
50
250
60
50
1000
mA
mA
mA
Transmitter quiescent
I
CCC
I
CCD
MIN
MAX
UNIT
RT 1760 Package Options
For further information contact us at:
C-MAC MicroTechnology
South Denes, Great Yarmouth,
Norfolk, NR30 3PX, UK
Tel: +44 (0) 1493 743 100
Email: info@cmac.com
January 2008
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