BU-63825
SPACE LEVEL MIL-STD-1553
BC/RT/MT
ADVANCED COMMUNICATION ENGINE
(SP’ACE II) TERMINAL
FEATURES
Make sure the next
Card you purchase
has...
®
®
•
Direct Replacement for BU-61582
and BU-61583
•
Radiation Tolerant & Radiation
Hardened Versions
•
Fully Integrated 1553 Terminal
•
Flexible Processor Interface
•
16K x 16 Internal RAM
•
Automatic BC Retries
•
Programmable BC Gap Times
•
BC Frame Auto-Repeat
•
Intelligent RT Data Buffering
•
Ceramic Package
DESCRIPTION
The BU-63825(925) is a fully hardware & software compatible, direct
drop-in replacement for the BU-61582(83).
DDC’s BU-63825(925) Space Advanced Communication Engine
(Sp’ACE II) is a radiation hardened version of the BU-61580(81) ACE
terminal. DDC supplies the BU-63825 with enhanced screening for
space and other high reliability applications.
The BU-63825 provides a complete integrated BC/RT/MT interface
between a host processor and a MIL-STD-1553 bus. The
BU-63825(925) provides functional and software compatibility with
the standard BU-61580(81) product and is packaged in the same 1.9
square-inch package footprint.
As an option, DDC can supply the BU-63825 with space level screen-
ing. This entails enhancements in the areas of element evaluation
and screening procedures for active and passive elements, as well as
the manufacturing and screening processes used in producing the
terminals.
The BU-63825 integrates dual transceiver, protocol, memory man-
agement and processor interface logic, and 16K words of RAM in the
choice of 70-pin DIP or flat pack packages. Transceiverless versions
may be used with an external electrical or fiber optic transceiver.
To minimize board space and ‘glue’ logic, the Sp’ACE II terminals
provide flexibility in interfacing to a host processor and internal/exter-
nal RAM.
•
Multiple Ordering Options;
+5V (Only)
+5V/-15V
+5V/-12V
+5V/Transceiverless
+5V (Only, with Transmit Inhibits)
WARNING: EXPORT CONTROLLED PRODUCT
This data sheet or product brief consists of Data De-
vice Corporation general product information that does
not contain controlled technical data as defined in the
International in Arms Regulations (ITAR) Part 120.10 or
Export Administration Regulations (EAR) Part 734.7-11.
The technology described herein is controlled under the
EAR and may not be exported without proper authoriza-
tion by the U.S. Department of Commerce as determined
on a case by case basis.
FOR MORE INFORMATION CONTACT:
Data Device Corporation
105 Wilbur Place
Bohemia, New York 11716
631-567-5600 Fax: 631-567-7358
www.ddc-web.com
Technical Support:
1-800-DDC-5757 ext. 7677 or 7381
7771
All trademarks are the property of their respective owners.
© 2005 Data Device Corporation
Data Device Corporation
www.ddc-web.com
16K X 16
SHARED
RAM
TRANSCEIVER
A
DATA BUS
DUAL
ENCODER/DECODER,
MULTIPROTOCOL
AND
MEMORY
MANAGEMENT
ADDRESS BUS
ADDRESS
BUFFERS
DATA
BUFFERS
D15-D0
PROCESSOR
DATA BUS
A15-A0
PROCESSOR
ADDRESS BUS
TRANSCEIVER
B
TRANSPARENT/BUFFERED, STRBD, SELECT,
RD/WR, MEM/REG, TRIGGER_SEL/MEMENA-IN,
MSB/LSB/DTGRT
IOEN, MEMENA-OUT, READYD
ADDR_LAT/MEMOE, ZERO_WAIT/MEMWR,
8/16-BIT/DTREQ, POLARITY_SEL/DTACK
INT
PROCESSOR
AND
MEMORY
CONTROL
INTERRUPT
REQUEST
PROCESSOR
AND
MEMORY
INTERFACE
LOGIC
CH. A
2
CH. B
RT ADDRESS
RTAD4-RTAD0, RTADP
INCMD
MISCELLANEOUS
CLK_IN, TAG_CLK,
MSTCLR,SSFLAG/EXT_TRG
DS-BU-63825-S
10/14
FIGURE 1. BU-63825 BLOCK DIAGRAM
TABLE 1. SP’ACE II SERIES SPECIFICATIONS
PARAMETER
ABSOLUTE MAXIMUM RATING
Supply Voltage
Logic +5V
Transceiver +5V
-15V
-12V
Logic
Voltage Input Range
RECEIVER
Differential Input Resistance
X1/X2 (Notes 1-6)
X3/X6 (Notes 1-6)
Differential Input Capacitance
X1/X2 (Notes 1-6)
X3/X6 (Notes 1-6)
Threshold Voltage, Transformer
Coupled, Measured on Stub
Common Mode Voltage (Note 7)
TRANSMITTER
Differential Output Voltage
Direct Coupled Across 35
Ω,
Measured on Bus
Transformer Coupled Across
70
Ω,
Measured on Bus
Output Noise, Differential (Direct
Coupled)
Output Offset Voltage, Transformer
Coupled Across 70 ohms
Rise/Fall Time
LOGIC (Note 12)
V
IH
(V
CC
= 5.5V)
MSTCLR, CLOCK_IN, STRBD
All other inputs
V
IL
(V
CC
= 4.5V)
MSTCLR, CLOCK_IN, STRBD
All other inputs
Hysteresis
MSTCLR, CLOCK_IN, STRBD
I
IH
(V
CC
=5.5V, V
IN
=2.7V)
CLOCK_IN
All other inputs
I
IL
(V
CC
=5.5V, V
IN
=0.0V)
CLOCK_IN
All other inputs
V
OH
(V
CC
=4.5V, I
OH
=max)
V
OL
=(V
CC
=4.5V, I
OL
=max)
I
OH
(V
CC
=4.5V)(Note 13)
I
OL
= (V
CC
=4.5V)
POWER SUPPLY REQUIREMENTS
Voltages/Tolerances
BU-63825/925X0
• +5V (Logic)
BU-63825/925X1
• +5V (Logic)
• +5V ( Ch. A, Ch. B)
• V
A
V
B
BU-63825/925X2
• +5V (Logic)
• +5V ( Ch. A, Ch. B)
• V
A
V
B
MIN
TYP
MAX
UNITS
TABLE 1. SP’ACE II SERIES SPECIFICATIONS
(CONT)
PARAMETER
MIN
TYP
MAX
UNITS
POWER SUPPLY REQUIREMENTS
(Cont’d)
Voltages/Tolerances (cont’d)
BU-63825/925X3/X6 (+5V Only)
• +5V (Logic)
• +5V ( Ch. A, Ch. B)
Current Drain (Total Hybrid)
BU-63825/925X0
• +5V (Logic)
BU-63825/925X1
• +5V (Note 10)
• -15V Idle
• 25% Transmitter Duty Cycle
• 50% Transmitter Duty Cycle
• 100% Transmitter Duty Cycle
BU-63825/925X2
• +5V (Note 10)
• -12V Idle
• 25% Transmitter Duty Cycle
• 50% Transmitter Duty Cycle
• 100% Transmitter Duty Cycle
BU-63825/925X3/X6
(+5V) (Logic, CH. A & CH. B)
• Idle
• 25% Transmitter Duty Cycle
• 50% Transmitter Duty Cycle
• 100% Transmitter Duty Cycle
POWER DISSIPATION
Total Hybrid
BU-63825/925X0
BU-63825/925X1
• Idle
• 25% Transmitter Duty Cycle
• 50% Transmitter Duty Cycle
• 100% Transmitter Duty Cycle
BU-63825/925X2
• Idle
• 25% Transmitter Duty Cycle
• 50% Transmitter Duty Cycle
• 100% Transmitter Duty Cycle
BU-63825/925X3/X6
• Idle
• 25% Transmitter Duty Cycle
• 50% Transmitter Duty Cycle
• 100% Transmitter Duty Cycle
Hottest Die
BU-63825/925X0
BU-63825/925X1
• Idle
• 25% Transmitter Duty Cycle
• 50% Transmitter Duty Cycle
• 100% Transmitter Duty Cycle
BU-63825/925X2
• Idle
• 25% Transmitter Duty Cycle
• 50% Transmitter Duty Cycle
• 100% Transmitter Duty Cycle
BU-63825/925X3/X6
• Idle
• 25% Transmitter Duty Cycle
• 50% Transmitter Duty Cycle
• 100% Transmitter Duty Cycle
-0.5
-0.5
+0.5
+0.5
-0.5
6.5
7.0
-18.0
-18.0
V
CC
+0.5
V
V
V
V
V
4.5
4.75
5.0
5.0
50
140
30
68
105
180
140
30
80
130
230
5.5
5.25
190
240
60
108
175
270
240
60
120
185
305
250
355
460
670
V
V
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
11
2.5
10
25
0.860
10
kΩ
kΩ
pF
pF
Vp-p
Vpeak
6
18
7
20
9
27
10
Vp-p
Vp-p
mVp-p,
diff
mV
nsec
-250
100
150
250
300
0.250
0.875
1.22
1.475
2.0
0.86
1.16
1.46
2.06
0.750
2.1
2.5
2.97
3.77
1.92
2.35
2.84
3.71
1.34
1.57
1.79
2.23
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
3.85
2
1.35
0.8
0.5
-10
-400
-10
-600
4
+10
-20
+10
-60
0.5
-8
8
V
V
V
V
V
µA
µA
µA
µA
V
V
mA
mA
0.225
0.335
0.600
0.860
1.385
0.290
0.590
0.890
1.490
0.50
0.68
1.06
1.45
2.23
0.59
0.92
1.36
2.16
0.28
0.51
0.75
1.22
4.5
5.0
5.5
5.5
5.5
-15.75
5.5
5.5
-12.6
V
V
V
V
V
V
V
4.5
5.0
4.5
5.0
-14.25 -15.0
4.5
4.5
-11.4
5.0
5.0
-12.0
Data Device Corporation
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3
DS-BU-63825-S
10/14
TABLE 1. SP’ACE II SERIES SPECS (CONT)
PARAMETER
CLOCK INPUT
Frequency
Nominal Value (programmable)
• Default Mode
• Option
Long Term Tolerance
• 1553A Compliance
• 1553B Compliance
Short Term Tolerance,1 second
• 1553A Compliance
• 1553B Compliance
Duty Cycle
1553 MESSAGE TIMING
Completion of CPU Write (BC Start-
to-Start of Next Message)
BC Intermessage Gap (Note 8)
BC/RT/MT Response Timeout (Note
9)
18.5 nominal
22.5 nominal
50.5 nominal
128.0 nominal
Transmitter Watchdog Timeout
RT Response Time (Note 11)
THERMAL
Thermal Resistance, Junction-to-
Case,
Hottest Die (θ
JC
)
BU-63825/925X0
BU-63825/925X1
BU-63825/925X2
BU-63825/925X3/X6
Operating Junction Temperature
Storage Temperature
Lead Temperature
(soldering, 10 sec.)
PHYSICAL CHARACTERISTICS
Size
70-pin DIP, Flat Pack, Gull Lead
Weight
70-pin DIP, Flat Pack, Gull Lead
MIN
TYP
MAX
UNITS
16.0
12.0
-0.01
-0.10
-.001
-0.01
MHz
MHz
0.01
0.10
0.001
0.01
60
%
%
%
%
%
µs
µs
19.5
23.5
51.5
131
7
µs
µs
µs
µs
µs
µs
TABLE 1 NOTES (cont)
(9) Software programmable (4 options). Includes RT-to-RT Timeout
(Mid-Parity of Transmit Command to Mid-Sync of Transmitting RT
Status).
(10) For both +5 V logic and transceiver. +5 V for channels A and B.
(11) Measured from mid-parity crossing of Command Word to mid-sync
crossing of RT's Status Word.
(12) MSTCLR, CLOCK_IN, and STRBD are CMOS inputs with hystere-
sis. Remainder are TTL.
(13) Minus sign indicates direction of current flow.
40
2.5
9.5
17.5
21.5
49.5
128
4
18.5
22.5
50.5
129.5
668
INTRODUCTION
DDC’s Sp’ACE II series of integrated BC/RT/MT hybrids provide
a complete, flexible interface between a microprocessor and a
MIL-STD-1553A, B Notice 2, McAir, or STANAG 3838 bus,
implementing Bus Controller, Remote Terminal (RT) and Monitor
Terminal (MT) modes. Packaged in a single 1.9 square inch
70-pin DIP, surface mountable Flat Pack or Gull Lead, the
Sp’ACE II series contains dual low-power transceivers and
encoder/decoders, complete BC/RT/MT multiprotocol logic,
memory management and interrupt logic, 16K X 16 of shared
static RAM and a direct, buffered interface to a host processor
bus.
The BU-63825 contains internal address latches and bidirec-
tional data buffers to provide a direct interface to a host proces-
sor bus. The BU-63825 may be interfaced directly to both 16-bit
and 8-bit microprocessors (Please see Appendix G in the ACE
User’s Guide for Product Advisory regarding SP’ACE and
SP’ACE II operating in 8-bit Buffered Non-Zero Wait Mode) in a
buffered shared RAM configuration. In addition, the Sp’ACE II
may connect to a 16-bit processor bus via a Direct Memory
Access (DMA) interface. The BU-63825 includes 16K words of
buffered RAM. Alternatively, the Sp’ACE II may be interfaced to
as much as 64k words of external RAM in either the shared RAM
or DMA configurations.
The Sp’ACE II RT mode is multiprotocol, supporting MIL-STD-
1553A, MIL-STD-1553B Notice 2, and STANAG 3838 (including
EFAbus).
The memory management scheme for RT mode provides an
option for separation of broadcast data, in compliance with
1553B Notice 2. Both double buffer and circular buffer options
are programmable by subaddress. These features serve to
ensure data consistency and to off-load the host processor for
bulk data transfer applications.
The Sp’ACE II series implements three monitor modes: a word
monitor, a selective message monitor, and a combined RT/selec-
tive monitor.
Other features include options for automatic retries and program-
mable intermessage gap for BC mode, an internal Time Tag
7.10
7.82
7.82
12
-55
-65
150
150
+300
°C/W
°C/W
°C/W
°C/W
°C
°C
°C
1.9 X 1.0 X 0.215
(48.26 x 25.4 x 5.46)
0.6
(17)
in.
(mm)
oz
(g)
TABLE 1 NOTES: Notes 1 through 6 are applicable to the Receiver
Differential Resistance and Differential Capacitance specifications:
(1) Specifications include both transmitter and receiver (tied together
internally).
(2) Measurement of impedance is directly between pins TX/RX A(B)
and TX/RX A(B) of the Sp’ACE II Series hybrid.
(3) Assuming the connection of all power and ground inputs to the
hybrid.
(4) The specifications are applicable for both unpowered and powered
conditions.
(5) The specifications assume a 2 volt rms balanced, differential, sinu-
soidal input. The applicable frequency range is 75 kHz to 1 MHz.
(6) Minimum resistance and maximum capacitance parameters are
guaranteed, but not tested, over the operating range.
(7) Assumes a common mode voltage within the frequency range of dc
to 2 MHz, applied to pins of the isolation transformer on the stub
side (either direct or transformer coupled), referenced to hybrid
ground. Use a DDC recommended transformer or other transformer
that provides an equivalent minimum CMRR.
(8) Typical value for minimum intermessage gap time. Under software
control, may be lengthened to (65,535 µs minus message time), in
increments of 1 µs.
Data Device Corporation
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4
DS-BU-63825-S
10/14
Register, an Interrupt Status Register and internal command
illegalization for RT mode.
FUNCTIONAL OVERVIEW
TRANSCEIVERS
For the +5 V and -15 V/-12 V front end, the BU-63825X1(X2)
uses low-power bipolar analog monolithic and thin-film hybrid
technology. The transceiver requires +5 V and -15 V (-12 V) only
(requiring no +15 V/+12 V) and includes voltage source transmit-
ters. The BU-63825X3(X6) utilizes low-power BiCMOS analog
monolithic and thin film hybrid technology as well but requires
+5V only. The voltage source transmitters provide superior line
driving capability for long cables and heavy amounts of bus load-
ing.
The receiver sections of the BU-63825 are fully compliant
with MIL-STD-1553B in terms of front end overvoltage pro-
tection, threshold, common mode rejection, and word error
rate. In addition, the receiver filters have been designed for
optimal operation with the M-Rad chip’s Manchester II decod-
ers.
M-RAD DIGITAL MONOLITHIC
The M-Rad digital monolithic represents the cornerstone ele-
ment of the BU-63825 Sp’ACE II family of terminals. The M-Rad
chip is actually a radiation hardened version of DDC’s M’
(M-prime) monolithic which is the key building block behind
DDC’s non-radiation hardened BU-61580 ACE series of termi-
nals. As such, the M-Rad possesses all the enhanced hardware
and software features which have made the BU-61580 ACE the
industry standard 1553 interface component.
The M-Rad chip consists of a dual encoder/decoder; complete
protocol for Bus Controller (BC), 1553A/B/McAir Remote Terminal
(RT), and Monitor (MT) modes; memory management and inter-
rupt logic; a flexible, buffered interface to a host processor bus
and optional external RAM. Reference the region within the dot-
ted line of FIGURE 1. Besides realizing all the protocol, memory
management, and interface functions of the earlier AIM-HY
series, the M-Rad chip includes a large number of enhance-
ments to facilitate hardware and software design, and to further
off-load the 1553 terminal’s host processor.
DECODERS
The default mode of operation for the BU-63825 BC/RT/MT
requires a 16 MHz clock input. If needed, a software program-
mable option allows the device to be operated from a 12 MHz
clock input. Most current 1553 decoders sample using a 10 MHz
or 12 MHz clock. In the 16 MHz mode (or 12 MHz), the decoders
sample using both clock edges; this provides a sampling rate of
32 MHz or 24 MHz. The faster sampling rate for the M-Rad’s
Manchester II decoders provides superior performance in terms
of bit error rate and zero-crossing distortion tolerance.
For interfacing to fiber optic transceivers for MIL-STD-1773
applications, a transceiverless version of the Sp’ACE II can be
used. These versions provide a register programmable option for
a direct interface to the single-ended outputs of a fiber optic
receiver. No external logic is needed.
TIME TAGGING
The Sp’ACE II includes an internal read/writable Time Tag
Register. This register is a CPU read/writable 16-bit counter with
a programmable resolution of either 2, 4, 8, 16, 32, or 64 µs per
LSB. Also, the Time Tag Register may be clocked from an exter-
nal oscillator. Another option allows software controlled incre-
menting of the Time Tag Register. This supports self-test for the
Time Tag Register. For each message processed, the value of
the Time Tag register is loaded into the second location of the
respective descriptor stack entry (“TIME TAG WORD”) for both
BC and RT modes.
Additional provided options will: clear the Time Tag Register fol-
lowing a Synchronize (without data) mode command or load the
Time Tag Register following a Synchronize (with data) mode
command; enable an interrupt request and a bit setting in the
Interrupt Status Register when the Time Tag Register rolls over
from FFFF to 0000. Assuming the Time Tag Register is not
loaded or reset, this will occur at approximately 4 second time
intervals, for 64 µs/LSB resolution, down to 131 ms intervals,
for 2 µs/LSB resolution.
Another programmable option for RT mode is the automatic clear-
ing of the Service Request Status Word bit following the
BU-63825’s response to a Transmit Vector Word mode command.
INTERRUPTS
The Sp’ACE II series components provide many programmable
options for interrupt generation and handling. The interrupt out-
put pin INT has three software programmable modes of opera-
tion: a pulse, a level output cleared under software control, or a
level output automatically cleared following a read of the Interrupt
Status Register. Individual interrupts are enabled by the Interrupt
Mask Register. The host processor may easily determine the
cause of the interrupt by using the Interrupt Status Register. The
Interrupt Status Register provides the current state of the inter-
rupt conditions. The Interrupt Status Register may be updated in
two ways. In the standard interrupt handling mode, a particular
bit in the Interrupt Status Register will be updated only if the
condition exists and the corresponding bit in the Interrupt Mask
Register is enabled. In the enhanced interrupt handling mode, a
particular bit in the Interrupt Status Register will be updated if
the condition exists regardless of the contents of the corre-
sponding Interrupt Mask Register bit. In any case, the respective
Interrupt Mask Register bit enables an interrupt for a particular
condition.
Data Device Corporation
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5
DS-BU-63825-S
10/14
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