The BU-63147/49 transceiver is a complete dual transmitter and receiver pair conforming fully to MIL-STD-1553A and 1553B. Features include: monolithic design, +5V power supply voltage, Harris or Smiths type decoder interface, completely independent dual redundant operation, and small size (36-pin DIP). The receiver section of the BU63147/49 series accepts phasemodulated bipolar data from a MIL-STD-1553 Data Bus and produces TTL Signal data at its output. The RX DATA OUT and RX DATA OUT outputs represent positive and negative variations of the input data signals beyond an internally fixed threshold level. An external STROBE input enables or disables the receiver's outputs. The transmitter section accepts bi-phase TTL signal data at its TX DATA IN and TX DATA IN inputs and produces phase-modulated bipolar data at the TX DATA OUT and TX DATA OUT outputs. The transmitter's output voltage level is typically about 11Vpp. An external input, INHIBIT, takes priority over the transmitter inputs and disables the transmitter when activated with a logic "1". The small size, +5V power supply voltage, and compliance with MIL-STD-1553 simplify engineering design, making it an excellent choice for interfacing with any MIL-STD1553 system.
RECEIVER STROBE BI PHASE TTL DATA COMPARATOR RX DATA OUT RX DATA OUT DECODER
PHASE MODULATED BIPOLAR DATA RX DATA IN SHORT OR LONG STUB COUPLING ISOLATION TRANSFORMER RX DATA IN
FIGURE 1. BU-63147/49 BLOCK DIAGRAM (one channel shown)
TABLE 1. BU-63147/49 SPECIFICATIONS PARAMETER ABSOLUTE MAXIMUM RATING Supply Voltage +5 V (Vcc) Receiver ! Input Voltage Logic ! Voltage Input Range RECEIVER Differential Input Resistance (Notes 1-6) Differential Input Capacitance (Notes 1-6) Threshold Level (Note 7) Common Mode Voltage (Note 8) TRANSMITTER Differential Output Voltage ! Direct Coupled Across 35 , Measured on Bus ! Transformer Coupled Across 70 , Measured on Stub:· BU-63147XX-XX0· BU-63147X3-XX2 (Note 9) Output Noise, Differential (Direct Coupled) Output Offset Voltage, Transformer Coupled Across 70 ohms Rise/Fall Time· BU-63147X3· BU-63147X4 LOGIC VIH VIL IIH Tx Data In, Tx Inhibit Rx Strobe IIL Tx Data In, Tx Inhibit Rx Strobe VOH (Vcc=4.75V,IOH=max) VOL (Vcc=4.75V, IOL=max) IOL IOH POWER SUPPLY REQUIREMENTS Voltages/Tolerances ! +5V Current Drain (Total Hybrid) BU-63147/9XX-XX0· Idle (Both Channels)· 25% Transmitter Duty Cycle (One Channel)· 50% Transmitter Duty Cycle (One Channel)· 100% Transmitter Duty Cycle (One Channel) BU-63147/9X3-XX2· Idle (Both Channels)· 25% Transmitter Duty Cycle (One Channel)· 50% Transmitter Duty Cycle (One Channel)· 100% Transmitter Duty Cycle (One Channel) MIN TYP MAX UNITS
TABLE 1. BU-63147/49 SPECIFICATIONS PARAMETER MIN TYP MAX POWER DISSIPATION (Note 10) Total Hybrid BU-63147/9XX-XX0· Idle (Both Channels) 0.55· 25% Transmitter Duty Cycle 0.78 (One Channel)· 50% Transmitter Duty Cycle 1.00 (One Channel)· 100% Transmitter Duty Cycle 1.44 (One Channel) BU-63147/9X3-XX2· Idle (Both Channels) 0.55· 25% Transmitter Duty Cycle 0.84 (One Channel)· 50% Transmitter Duty Cycle 1.13 (One Channel)· 100% Transmitter Duty Cycle 1.70 (One Channel) Hottest Die BU-63147/9XX-XX0· Idle (Both Channels) 0.28· 25% Transmitter Duty Cycle 0.51 (One Channel)· 50% Transmitter Duty Cycle 0.75 (One Channel)· 100% Transmitter Duty Cycle 1.22 (One Channel) BU-63147/9X3-XX2· Idle (Both Channels) 0.28· 25% Transmitter Duty Cycle 0.58 (One Channel)· 50% Transmitter Duty Cycle 0.88 (One Channel) 1.48· 100% Transmitter Duty Cycle (One Channel) THERMAL· Thermal Resistance, Junction-to12 Case, Hottest Die (JC) -55 150· Operating Junction Temperature -65 150· Storage Temperature +300· Lead Temperature (soldering, 10 sec.) PHYSICAL CHARACTERISTICS Size 36-Pin DIP 5.3) 36-Lead Flat pack x 4.2) Weight 0.6 (17)
Notes 1 through 6 are applicable to the Receiver Differential Resistance and Differential Capacitance specifications:
(1) Specifications include both transmitter and receiver (assumed tied together externally). (2) Impedance parameters are specified directly between pins TX/RX A(B) and TX/RX A(B) hybrid. It is assumed that all power and ground inputs to the hybrid are connected and that the hybrid case is connected to ground for the impedance measurement.
Notes (continued) (4) The specifications are applicable for both unpowered and powered conditions. (5) The specifications assume a 2 volt rms balanced, differential, sinusoidal input. The applicable frequency range is 75 kHz to 1 MHz. (6) Minimum resistance and maximum capacitance parameters are guaranteed over the operating range, but are not tested. (7) The Threshold Level, as referred to in this specification, is meant to be the maximum peak-to-peak voltage (measured on the data bus) that can be applied to the receiver's input without causing the output to change from the OFF state. (8) Assumes a common mode voltage within the frequency range to 2 MHz, applied to pins of the isolation transformer on the stub side (either direct or transformer coupled), and referenced to transceiver ground. Transformer must be a DDC recommended transformer or other transformer that provides an equivalent minimum CMRR. (9) MIL-STD-1760 requires minimum output voltage of 20 Vp-p on the stub connection. The -XX2 option is not available for the BU-63147X4 version. (10) Power dissipation specifications assume a transformer coupled configuration, with external dissipation (while transmitting) of 0.14 watts for the active isolation transformer, 0.08 watts for the active coupling transformer, 0.45 watts for each of the two bus isolation resistors, and 0.15 watts for each of the two bus termination resistors.
TABLE 2. TRANSMIT OPERATING MODE TX Data X TX Data X TX INHIBIT DRIVER OUTPUT OFF (NOTE) OFF TX DATA OUT ON, TX DATA OUT OFF TX DATA OUT ON, TX DATA OUT OFF
NOTE: DRIVER OUTPUT terminals are in the high impedance mode during OFF time, independent of INHIBIT status.
The receiver section accepts data from a MIL-STD-1553 Data Bus when coupled to the Data Bus as shown in FIGURE 3. This data is converted to bi-phase TTL and furnished to RX DATA OUT and RX DATA OUT. When STROBE is high data passes through the receiver to RX DATA OUT and RX DATA OUT. Applying a low to STROBE disables the receiver output terminals. As illustrated in FIGURE 2, the receiver in the BU-65147 provides compatibility to the Harris decoder, while the BU-63149 provides compatibility to the Smiths decoder.
The is a dual redundant transmitter and receiver packaged a 36-pin DDIP. It is directly compatible to Harris 15530 encoder/decoder and has internal (factory preset) threshold levels. The dual transceiver only requires +5V power and conforms to MIL-STD-1553A and 1553B. For McAir compatibility, versions are available with rise/fall times to 300 nsec. FIGURE 3 illustrates the connection between a BU-63147/49 transceiver and a MIL-STD-1553 Data Bus. After transformer isolating the transceiver, it can be either direct coupled (short stub) or transformer coupled (long stub) to the Data Bus.
FIGURE 2 illustrates the BU-63147 with Harris type decoder interface and the BU-63149 with Smiths type decoder interface. Note that DATA and DATA inputs must be complementary waveforms with a 50% duty cycle.
TX Data In TX Data In LINE-TO-LINE OUTPUT LINE-TO-LINE INPUT
The transmitter section accepts encoded TTL data and converts it to phase-modulated bipolar form using a waveshaping network and driver circuits. The driver outputs TX DATA OUT and TX DATA OUT are transformer coupled to the Data Bus. The transmitter output terminals can be put into a high impedance state by setting INHIBIT high, or setting TX DATA IN and TX DATA IN to the same logic level. The operating modes are shown in TABLE 2. The transceivers are able to operate in a "wraparound" mode. This allows output data to be monitored by the receiver section and returned to the decoder where it is checked for errors. Data Device Corporation www.ddc-web.com
Notes: (1) TX Data In and RX Data Out are TTL signals. (2) TX Data In inputs must be at opposite logic levels during transmission, and at the same logic level when not transmitting. (3) LINE-TO-LINE output voltage is measured between TX Data Out and TX Data Out. (4) LINE-TO-LINE input voltage is measured on the Data Bus.