CT1775 Universal MacAir/1553 Dumb RTU Hybrid PRELIMINARY DATA SHEET www.aeroflex.com/Avionics FEATURES ❑ CT1775 Replaces DDC BUS-65201 ❑ Includes: - Universal Transceiver - Encoder/decoder - Dual Rank I/O Registers - Fail-safe Timer - Clock Oscillator ❑ Simple Controls for Single or Dual Redundant Data Bus Configurations ❑ Provides Flags for: - Own Address (With Parity) - Mode Code - Broadcast - Time Out - Valid Word - Sync Type ❑ 16 Bit or 8 Bit 3-State - Parallel I/O and Serial Out ❑ Wraparound Built-In Test ❑ MIL-PRF-38534 Compliant Circuits Available ❑ Packaging – Hermetic Metal - 68 Pin, 1.85" x 1.6" x .19" Plug-In Type Package DESCRIPTION The CT1775 Universal MACAIR/1553 Dumb Remote Terminal Unit (RTU) consists of a transceiver, and encoder/decoder, control logic, dual rank I/O registers and internal clock oscillator packaged in a 1.6" x 1.9" hermetic hybrid. It provides all the functions required to interface between a MACAIR (sinusodial) or MIL-STD-1553 (Trapezoidal) serial MUX data bus and a subsystem parallel 3-state data highway. Utilizing several ASIC ICs, the CT1775 provides sufficient handshaking, control and data lines to permit versatile operation as a remote terminal, a bus controller or a bus monitor, in either single or dual redundant data bus configurations. As a transmitter, the CT1775 accepts 8 bit or 16 bit parallel date from the subsystem, and outputs serial Manchester II coded Command, Status or Data words, under subsystem control. As a receiver, it accepts serial MIL-STD-1553 or MACAIR transmissions and transfers all Command, Status and Data words to the 8 bit or 16 bit data highway, under subsystem control. The CT1775 also provides flags to the subsystem when Broadcast, Mode Code, and Own Address (with parity) commands are decoded. The CT1775 contains a terminal fail-safe timeout circuit which flags message lengths exceeding 768µs, and terminates serial data transmission. Wraparound selftest is initiated by a control line which causes the encoder serial output to be connected to the decoder input. The CT1775 provides a serial output of decoded words, thus allowing Command Word look ahead, for the fastest terminal response. SCDCT1775 Rev B RX DATA RX DATA TX DATA TX DATA LIMITER 2 CLOCK OUT CLOCK POWER T/O CLOCK IN FILTER SHAPING NETWORK SHAPING NETWORK XTAL CLOCK GEN DRIVER DRIVER TX INHIBIT DEC RST 5 SERIAL DATA OUT TAKE ENA ADDR DATA ADDR IN PAR S/T DSC ADDR SELECT OUT PAR IN MRST DECODER AND CONTROL LOGIC MANCHESTER REGISTER REGISTER LOAD LOAD DATA1 DATA2 SERIAL DATA IN ESC SEND OUT DATA FIGURE 1 – CT1775 BLOCK DIAGRAM RX STROBE FAILSAFE DRIVER ENCODER AND CONTROL LOGIC MANCHESTER ENC ENABLE SYNC SELECT DATA SELECT2 DATA SELECT1 REGISTER REGISTER LATCH LATCH DATA1 DATA2 D15 (MSB) THRU D0 (LSB) SERIAL DATA OUT BIT STATUS RTENABLE PARITY COMM DATA SYNC FAIL-SAFE VAL CMD WD VALID WORD MODE CODE BROADCAST BDST INHIBIT CHAN SELECT DATA } SCDCT1775 Rev B } VALUES AT NOMINAL POWER SUPPLY VOLTAGES UNLESS OTHERWISE SPECIFIED PARAMETER Receiver Differential Input Impedance (DC to 1MHz) Differential Input Voltage Input Threshold (Direct Coupled) CMRR (DC to 2MHZ) CMV (DC to 2MHZ) RX STROBE Characteristics Transmitter Differential Output Voltage Direct Coupled (across 145Ω Load) Transformer Coupled (at stub) Output Rise and Fall time Output Noise TX INHIBIT Characteristics Logic IIH, IIL, IOH, IOL VOH VOL VIH VIL VALUE UNITS 4 min 40 max 1 typ 40 min ±10 min 1 typ KΩ VP-P VP-P dB V TTL Loads 30 typ 21 typ 130 typ 10 max 1 typ VP-P VP-P ns mVP-P TTL Loads See pin function & loading Table 2.5 min 0.4 max 2.0 min 0.7 max V V V V Clock Supply -0.3 min Ground +0.3 min Supply -0.5 min Ground +0.5 min VOHC (Internal Clock) VOLC (Internal Clock) VIHC (External Clock) VILC (External Clock) Power Supplies +5V OSC/CLOCK Supply Voltage Tolerances Current Drain +5V Logic Supply Voltage Tolerances Current Drain +15V (or +12V) Supply Voltage Tolerances Current Drain -15V Supply Voltage Tolerances Current Drain Idle 25% Transmit 100% Transmit -12V Supply Voltage Tolerances Current Drain Idle 25% Transmit 100% Transmit Temperature Range Operating (Case) Storage Physical Characteristics Size 68 pin DDIP 3 V V V ±10 8 typ; 13 max % mA ±10 250 max % mA ±5 65 max % mA ±5 % 65 max 105 max 250 max mA mA mA ±5 % 65 max 105 max 250 max mA mA mA −55 to +125 −65 to +150 °C °C 1.6 x 1.9 x 0.18 in TABLE 1 – CT1775 SPECIFICATIONS SCDCT1775 Rev B V GENERAL DUAL REDUNDANT OPERATION As shown in the block diagram of Figure 1, the CT1775 provides all functions required to implement a Dumb Remote Terminal Unit (RTU). It is designed for the greatest flexibility and ease of use. CT1775 can be operated with either an internal or external clock. Simple control lines are provided to interface with either single channel or dual redundant configurations. The CT1775 may be used in a dual redundant configuration with a minimum of additional circuitry. A CHAN SELECT signal is provided which simultaneously disables the LATCH DATA, DATA SELECT, and ENC ENABLE lines of the CT1775. Therefore, CHAN SELECT can be used to multiplex a single set of LATCH DATA, DATA SELECT and ENC ENABLE control signals between two CT1775 units, which have these signals tied together in parallel. Control lines are available to implement either on line or off line wraparound built-in test. CT1775 can be configured to perform a parity check on its hard-wired terminal address. It provides numerous output flags to simplify the use interface. These flags indicate various decoded messages, as well as the results of error checks. Sync selection, along with the flexible controls, allows the CT1775 to operate as a Bus Controller as well as a Remote Terminal. WRAPAROUND BUILT-IN TEST The CT1775 may be configured to implement either on line or off line wrap around built-in test. By enabling the receiver with RX STROBE during a normal transmission, the encoded word will be fed back into the decoder by the receiver. In this on line wrap around mode of operation, the CT1775 compares each decoded word that is fed back with the original word that was encoded. The BIT STATUS output flag indicates when the two words are not the same. INTERNAL OR EXTERNAL CLOCK CT1775 may be operated with either its internal clock or an external clock. Internal clock operation requires that a 12 MHz parallel-resonant fundamental-mode crystal, such as MIL-C-3098/42 TYPE CR64/U, be connected between pin 18 (XTAL) and ground. In addition, +5 volt power must be connected to pin 2 (OSC/CLOCK POWER), and CLOCK OUT (pin 19) must be connected to CLOCK in (pin 24). Care must be taken when using this on line wrap around test technique because an outgoing status word will be interpreted by the decoder as a new command word. Since the status word has the correct address and the same sync as a command word, the CT1775 will set RT ENABLE and VAL CMD WD. For on line wrap around operation, it is therefore necessary to reset RT ENABLE after transmission of a status word. This can be accomplished by inverting SEND DATA and applying it to DEC RST during status word transmission. If it is required that the status word be fed back, RT ENABLE should be reset immediately after it goes HIGH by applying a LOW to DEC RST for 1 microsecond (minimum). The status word will be available at the receive register. For external clock operation, no connection is made to pin 2 (OSC/CLOCK POWER, and the external clock is applied to pin 24 (CLOCK IN). Pin 19 (CLOCK OUT) is not connected. The external clock must be capable of driving a load of 20 picofarads to within 0.5 volts of the + 5 volt power supply and to within 0.5 volts of ground. Standard TTL voltage levels will not work properly. It must have a rise time and fall time of less than 10 nanoseconds. For compliance with MILSTD-1553, the external clock frequency must be 12 MHz. The CT1775 can be placed in an off line wrap around test mode by use of the S/T SELECT signal. In this mode, the transceiver is disabled and the encoder output is fed directly to the decoder input. All other functions remain the same, and the CT1775 compares each word that is decoded with the original word that was encoded. The BIT STATUS line also indicates the result of this comparison for the off line wrap around test. 8 BIT OR 16 BIT INTERFACE The CT1775 may be configured to interface with either 8 bit or 16 bit parallel data highways. For 16 bit operation, the 16 data lines (D 15 through DO) are used directly. LATCH DATA 1 and LATCH DATA 2 are tied together, as are DATA SELECT 1 and DATA SELECT 2. This allows data transfer in 16 bit bytes. FAIL SAFE TIME-OUT The CT1775 contains a timer which continuously monitors the length of each transmitted message. This timer detects a transmitted message which exceeds 768 microseconds and causes the transmission to terminate. At the same time, The FAIL-SAFE flag is set to indicate a Terminal Fail-Safe Time-out. Further transmissions are inhibited until the FAIL-SAFE flag is reset by MRST or a valid command word with the correct address is received. For 8 bit parallel data highways, the 16 data lines must be tied together in eight pairs (1315 to D7, D8 to 130, etc.) The two LATCH DATA and DATA SELECT are used independently. This allows transfer in two 8 bit bytes. ADDRESS WITH PARITY The CT1775 provides five lines for hard-wired terminal address. Internal pull-up resistors are provided on these lines, so logic "1" lines may be left open-circuited. Logic "0" lines must be grounded. The CT1775 maybe configured to check the parity of these five address lines. This function can be selected by using the ENA PAR CHECK line. The address parity line (TMADDP) is hard-wired for odd address parity if the function is sued. the ODD PARITY output flag indicates a valid check for odd parity of the six address lines. SCDCT1775 Rev B 4 OUTPUT FLAGS For multiple word transmissions, the next word may be transferred to the transmit register any time after SEND DATA goes HIGH, but no later than the next LOW to HIGH transition of SEND DATA. SEND DATA remains HIGH for 16 periods of ESC OUT, during which time the data word is serially shifted to the Manchester encoder. The encoder adds the parity bit during the next ESC OUT period after SEND DATA goes LOW. To terminate transmission after any word, ENC ENABLE must go to HIGH no later than the first rising edge of ESC OUT after SEND DATA goes LOW. The CT1775 provides numerous output flags to offer the greatest user flexibility. VALID WORD indicates receipt of a word with valid sync, Manchester coding and parity. RT ENABLE indicates a valid word and correct address. VAL CMD WD indicates a valid word and a Command Sync. BROADCAST indicates a valid command word and an address of 11111. The BROADCAST flag may be inhibited by using the BDCST INHIBIT line. MODE CODE indicates a valid command word and a subaddress of 11111 or 00000. The entire transmit cycle may be interrupted and initialized by applying a 1 microsecond (minimum) negative pulse to MRST. It is possible to input data to the encoder in serial form by forcing both transmit registers to be transparent. With LATCH DATA 1 held HIGH and LOAD DATA 1 held LOW, serial data input on D15 will be applied directly to the encoder serial input. ESC OUT must be used to shift in the serial data, MSB first, starting at the LOW to HIGH transition of SEND DATA. INITIALIZATION To ensure error-free operation, it is desirable to reset the CT1775 to its initialized state upon power turn-on. The MRST (master reset) signal is provided for this purpose. Both the flecoder and encoder, as well as all flags, are reset by a LOW on MRST. This function interrupts and overrides all other control signals. The MRST function can also be sued during fault recovery routines. DECODER OPERATION TRANSCEIVER OPERATION Figure 3 illustrates the receive mode timing. Decoder detail timing is shown in Figure 5. A receive cycle, which lasts for 20 clock periods of the 1 MHz DSC OUT, is initiated when the decoder recognizes a valid sync and two valid Manchester data bits. TAKE DATA goes LOW at the first HIGH to LOW (falling edge) transition of DSC OUT, following the second valid dat bit. COMM/DATA SYNC is updated at the next rising edge of DSC OUT after TAKE DATA goes LOW. COM/DATA SYNC remains in its new state until the next valid word or until DEC RST or MRST goes LOW. The CT1775 contains a transceiver similar to Aeroflex model CT3232. When connected to a serial MUX data bus via transformer and isolation resistors, as shown in Figure 6, the CT1775 transceiver will fully comply with MIL-STD-1553. The correct Technitrol part numbers for transformers used in direct-coupled and transformercoupled operation are shown in Figure 6. Transceiver TX INHIBIT and RX STROBE signals are provided to afford flexible operation. These signals may be used to disable the transmitter and receiver, respectively. TAKE DATA remains LOW for 16 periods of DSC OUT, during which time the 16 serial data bits are shifted into the first rank receive register. The serial data is simultaneously available at SERIAL DATA OUT as it is being shifted. At the completion of decoded data shifting, TAKE DATA goes HIGH, which transfers the data to the second rank receive register. This data may be enabled onto the parallel data highway by LOW on DATA SELECT at any time until the next rising edge of TAKE DATA. ENCODER OPERATION Figure 2 illustrates the transmit mode timing. Encoder detail timing is shown in Figure 4. The transmit cycle is initiated by a LOW on ENC ENABLE. The first HIGH to LOW (falling edge) transition of ESC OUT, when ENC ENABLE is LOW, starts the cycle which lasts for 20 clock periods of the 1 MHz ESC OUT. The next LOW to HIGH transition of ESC OUT strobes the SYNC SELECT line. A HIGH on SYNC SELECT produces a data sync and a LOW produces a command/status sync. At the first rising edge of DSC OUT after TAKE DATA goes HIGH, VALID WORD is updated. It will go LOW if the decoded word was valid. VALID WORD will go HIGH at the start of the next receive cycle, or after 20 microseconds if no additional words ar received. All output flags are enabled by VALID WORD, and therefore they are valid only as long as VALID WORD is LOW. A LOW to HIGH transition of SEND DATA occurs at the fourth falling edge of ESC OUT. This indicates the completion of the sync interval and the start of the serial data interval. Parallel data must be stable at the second rank transmit register prior to the rising edge of SEND DATA, which occurs 3 microseconds (minimum) after the HIGH to LOW transition of ENC ENABLE. LATCH DATA is used to transfer parallel data to the first rank transmit register. LATCH DATA must be brought LOW and DATA SELECT brought HIGH prior to the rising edge of SEND DATA. If SEND DATA is connected directly to LOAD DATA, it will lock out the second rank transmit register and serial data shifting into the encoder will proceed properly. SCDCT1775 Rev B 5 SYNC SERIAL DATA OUT 19 0 1 2 15 14 13 12 11 10 3 4 5 6 7 8 9 9 8 7 6 5 4 3 2 1 0 P 10 11 12 13 14 15 16 17 18 19 0 ESE OUT STROBE SYNC START CYCLE DATA SENT STROBE DATA END CYCLE DON’T CARE ENC ENABLE VALID SYNC DON’T CARE SYNC SEL 16µs SEND DATA (LOAD DATA) DON’T CARE LATCH DATA VALID DATA TRI-STATE DATA DON’T CARE DATA SELECT DON’T CARE FIGURE 2 – TRANSMIT MODE TIMING SYNC SERIAL DATA IN 19 0 1 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 P 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 2 SYNC 0 1 2 15 14 13 3 4 5 DSC OUT START CYCLE STROBE DATA TAKE DATA END CYCLE TAKE DATA 16µs COMM / DATA SYNC PREVIOUS STATE SERIAL DATA OUT PREVIOUS STATE CURRENT SYNC 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 UNDEFINED 15 DATA SELECT 1 CURRENT DATA TRI-STATE DATA 1 VALID WORD 2 FLAG OUTPUTS 3 BIT STATUS 4 DON’T CARE PREVIOUS STATE PREVIOUS STATE NOT VALID FLAGS VALID 3 NOT VALID BIT STATUS VALID 4 NOTES: 1. Parallel data is held continuously in second rank receiver register, and may be enabled onto the tri-state output at any time with a LOW on DATA SELECT. 2. VALID WORD will remainLOW for 20µsec then go HIGH, if a valid sync is not received. 3. FLAG OUTPUTS are valid only when VALID WORD is LOW. Flags are MODE CODE, RT Enable, BROADCAST and VAL CMD WD. 4. BIT STATUS is valid only if wraparound transmit plus receive cycle has been performed. LATCH DATA must be HIGH, and either S/T SELECT or RX STROBE must be HIGH for the full wraparound cycle duration. FIGURE 3 – RECEIVE MODE TIMING SCDCT1775 Rev B 6 19 0 1 2 3 4 ESC OUT START CYCLE STROBE SYNC STROBE DATA 110ns MAX ENC ENABLE 180ns MIN 190ns MIN SYNC SELECT 240ns MIN 80ns MAX SEND DATA (LOAD DATA) 80ns MIN DON’T CARE LATCH DATA 130ns MIN 80ns MIN DON’T CARE TRI-STATE DATA 100ns MIN 70ns MIN DON’T CARE DATA SELECT 130ns MIN FIGURE 4 – ENCODER DETAIL TIMING 5 6 7 0 1 2 DSC OUT 100ns MAX 100ns MAX TAKE DATA 150ns MAX COMM / DATA SYNC SERIAL DATA OUT PREVIOUS CURRENT SYNC 15 14 CURRENT 0 50ns MIN DATA SELECT 50ns MAX TRI-STATE DATA DON’T CARE CURRENT DATA 100ns MAX VALID WORD 60ns MAX MODE CODE 60ns MAX RT ENABLE 100ns MAX BROADCAST 110ns MAX VAL CMD WD FIGURE 5 – DECODER DETAIL TIMING SCDCT1775 Rev B 7 SCDCT1775 Rev B 8 49 68 51 67 3 1.4 : 1 *2 1 3 *2 4 5 6 7 8 4 5 6 7 Q1553-1 1:1 1 8 21V P-P 2 1 1:1.41 3 .75 ZΟ Q1553-20 .75 ZΟ 4 7V P-P FIGURE 6 – TYPICAL TRANSFORMER CONNECTIONS TRANSFORMER COUPLED 55Ω 55Ω DIRECT COUPLED 30V P-P * Transformer CT may be left open Technitrol Part #’s Q1553-1 & Q1553-20 RX DATA IN TX DATA OUT TX DATA OUT RX DATA IN CT1775 ZΟ = 78Ω ZΟ = 78Ω DATA BUS PIN FUNCTION AND LOADING TABLE PIN # NAME IIH (µA) IIL IOH IOL (mA) (mA) (mA) DESCRIPTION 1 GND Power supply and logic return. 2 +5V OSC/ CLOCK POWER +5V Power for oscillator and clock driver. 3 NC No connection. 4 TX INHIBIT 20 -0.4 A LOW on this input inhibits the transmitter. 5 SYNC SELECT 20 -0.4 A LOW on this input results in a transmitted DATA sync. A HIGH on this input results in a transmitted COMMAND (or STATUS) sync. 6 SERIAL DATA OUT -0.4 4.0 Received serial data in NRZ format is available at this output when TAKE DATA is LOW. 7 ESC OUT -0.4 4.0 LOW to HIGH transitions on this output when SEND DATA is HIGH causes the transmit cycle data shifting to occur. 8 NC 9 COMM / DATA SYNC 10 MRST 11 VALID WORD -0.4 4.0 A LOW on this output indicates receipt of a valid word. 12 BIT STATUS -0.4 4.0 A LOW on this output, during wrap around self test only, indicates that the last word decoded was identical to the last word encoded. 13 LATCH DATA 1 14 VAL CMD WD 15 BDCST INH 20 -0.4 A LOW on this input inhibits the indication of the BROADCAST output flag. 16 TMADD1* 20 -0.4 Part of 5 bit hard-wired terminal address input. 17 TMADD3* 20 -0.4 Part of 5 bit herd-wired terminal address input. 18 XTAL 19 CLOCK OUT -1.0 1.0 Output of oscillator and clock driver (see text). 20 TAKE DATA -0.4 4.0 A LOW on this output indicates that received data is being shifted into the first rank register and is available at SERIAL DATA OUT. A LOW to HIGH transition transfers the contents of the first rank receiver register to the second rank register. No connection. -.36 40 20 3.6 -0.8 A LOW on this output indicates receipt of a DATA word. A HIGH indicates receipt of a COMMAND (or STATUS) word. A LOW on this input (1 µsec minimum) resets the decoderto its initialized condition (same function as DEC RST), resets FAIL-SAFE, and stops and clears the transmit cycle. This function interrupts and overridesall othercontrols. -0.4 A HIGH on this input causes parallel tri-state I/O data on D8 through D15 to appear at the output of the first rank transmit register. A LOW locks out the register inputs. -0.4 4.0 A LOW on this output indicates the receipt of a valid command word. A 12 MHz parallel resonant crystal is connected between this input and ground. SCDCT1775 Rev B 9 PIN FUNCTION AND LOADING TABLE (con’t) PIN # NAME IIH (µA) 20 IIL IOH IOL (mA) (mA) (mA) -0.4 DESCRIPTION 21 DEC RST A LOW on this input (1 µsec minimum) resets the decoderto its initialized state, resets COMM/DATA SYNC to a LOW, and resets VALID WORD to a HIGH. 22 DSC OUT -0.4 4.0 LOW to HIGH transitions on this output when TAKE DATA is LOW causes causes receive cycle data shifting to occur. 23 SEND DATA -0.4 4.0 A HIGH on this output indicates that transmit cycle data shifting is occuring. 24 CLOCK IN ±1 ±.001 25 S/T SELECT 20 -0.4 26 FAIL-SAFE -0.4 4.0 A HIGH on this output indicates that a transmitted message has exceeded 768 µsec, and that transmission has been terminated. FAIL-SAFE is reset by either FIT ENABLE or MRST. 27 RT ENABLE -0.4 4.0 A HIGH on this output indicates receipt of a valid COMMAND word containing the correct 5 bit terminal address plus address parity. FAIL-SAFE is reset when FIT ENABLE goes HIGH. 28 MODE CODE -0.4 4.0 A LOW on this output indicates the reception of a valid COMMAND word whose sub-address field contains all ONES or all ZEROES. 29 LATCH DATA 2 20 -0.4 A HIGH on this input causes parallel tri-state I/O data on D0 through D7 to appear at the output of the first rank transmit register. A LOW locks out the register inputs. 30 ENCENABLE 20 -0.4 A LOW on this input causes the transmit cycle to start at the next HIGH to LOW transition of ESC OUT 31 BROADCAST 32 TMADD0* 20 -0.4 LSB of 5-bit hard-wired terminal address input. 33 TMADD2* 20 -0.4 Part of 5-bit hard-wired terminal address input. 34 TMADD4* 20 -0.4 MSB of 5-bit hard-wired terminal address input. 35 TMADDP 20 -0.4 Parity bit of hard-wired terminal address. Hard-wired for odd parity. 36 CHAN SELECT 100 -2.0 A LOW on this input enables DATA SELECT 1, DATA SELECT 2, LATCH DATA 1, LATCH DATA 2, and ENC ENABLE inputs. 37 ODD PARITY 38 D15 12 MHz clock input (20pF load) (see text). A HIGH on this input enables offline wraparound selftest.The transceiver is disabled and the encoder output is connected to the decoder input (see text). -0.4 20 -0.2 4.0 A HIGH on this output indicates reception of a valid COMMAND word whose address field contains all ONES, if BDCST INH is HIGH. -0.36 3.6 A HIGH on this output indicates a valid check for odd parity of terminal address plus parity bits, if ENA PAR CHECK is a LOW. -12 12 MSB of 16 bit parallel tri-state I/O. SCDCT1775 Rev B 10 PIN FUNCTION AND LOADING TABLE (con’t) PIN # NAME IIH (µA) IIL IOH IOL (mA) (mA) (mA) DESCRIPTION 39 D13 20 -0.2 -12 12 Part of 16 bit parallel tri-state I/O. 40 D11 20 -0.2 -12 12 Part of 16 bit parallel tri-state I/O. 41 D9 20 -0.2 -12 12 Part of 16 bit parallel tri-state I/O. 42 D7 20 -0.2 -12 12 Part of 16 bit parallel tri-state I/O. 43 D5 20 -0.2 -12 12 Part of 16 bit parallel tri-state I/O. 44 D3 20 -0.2 -12 12 Part of 16 bit parallel tri-state I/O. 45 D1 20 -0.2 -12 12 Part of 16 bit parallel tri-state I/O. 46 LOAD DATA 2 20 -0.4 47 +5V +5V power supply input. 48 +12V +12Vpower supply input. 49 RX DATA IN Inverted receiver input. 50 RX STROBE 51 TX DATA OUT Transmitter output. 52 CASE Case connection. 53 DATA SELECT 2 20 -0.4 A LOW on this input causes the output of the second rank receiver register to appear on D0 through D7 of the parallel tri-state I/O. 54 DATA SELECT 1 20 -0.4 A LOW on this input causes the output of the second rank receiver register to appear on D8 through D15 of the parallel tri-state I/O. 55 ENA PAR CHECK 20 -0.4 A LOW on this input enables the function of ODD PARITY. 56 D14 20 -0.2 -12 12 Part of 16 bit parallel tri-state I/O. 57 D12 20 -0.2 -12 12 Part of 16 bit parallel tri-state I/O. 58 D10 20 -0.2 -12 12 Part of 16 bit parallel tri-state I/O. 59 D8 20 -0.2 -12 12 Part of 16 bit parallel tri-state I/O. 60 D6 20 -0.2 -12 12 Part of 16 bit parallel tri-state I/O. 61 D4 20 -0.2 -12 12 Part of 16 bit parallel tri-state I/O. 62 D2 20 -0.2 -12 12 Part of 16 bit parallel tri-state I/O. 63 D0 20 -0.2 -12 12 LSB of 16 bit parallel tri-state I/O. 64 LOAD DATA 1 20 -0.4 65 GND 40 LOW on this input causes the data of the D0 through D7 outputs of the first rank transmit register to be loaded into the second rank transmit register. A HIGH locks out the second rank register inputs. -1.6 A LOW on this input disables the receiver output. A LOW on this input causes the data of the D8 through D15 outputs of the first rank transmit register to be loaded into the second rank transmit register. A HIGH locks out the second rank register inputs. Power supply and logic retum SCDCT1775 Rev B 11 PIN FUNCTION AND LOADING TABLE (con’t) PIN # NAME IIH (µA) IIL IOH IOL (mA) (mA) (mA) DESCRIPTION 66 -12V -12V power supply input. 67 RX DATA IN Receiver input. 68 TX DATA OUT Inverted transmitter output. NOTES: In the above table, the symbols are defined as follows: *Indicates use of an internal pull-up resistor. IIH = maximum input HIGH current with V IN = 2.5 volts. IIL = maximum input LOW current with VIN = 0.4 volts. IOH = maximum output HIGH current for VOUT = 2.5 volts minimum. IOL = maximum output LOW current for VOUT = 0.4 volts maximum. SCDCT1775 Rev B 12 CT1775 PIN OUT DESCRIPTION PIN # 1 18 2 19 3 20 4 21 5 22 6 23 7 24 8 25 9 26 10 27 11 28 12 29 13 30 14 31 15 32 16 33 17 34 TX DATA OUT GND TX DATA OUT XTAL RXSTROBE +5V OSC/CLOCK POWER RX DATA IN CLOCK OUT RX DATA IN N/C -Vc c TAKE DATA +Vcc TX INHIBIT GND DECR ST +5V SYNC SELECT LOAD DATA 1 DSC OUT LOAD DATA 2 SERIAL DATA OUT D0 SEND DATA MIL-STD-1553B D1 ESC OUT DUMB RTU HYBRID D2 CLOCK IN D3 N/C D4 S/T SELECT D5 COMM / DATA SYNC D6 FAIL-SAFE D7 MRST D8 RT ENABLE D9 VALID WORD D10 MODE CODE D11 BIT STATUS D12 LATCH DATA 2 D13 LATCH DATA 1 D14 ENC ENABLE D15 VAL CMD WD ENA PAR CHECK BROADCAST ODD PARITY BDCST INH DATA SELECT 1 TM ADD0 CHAN SELECT TM ADD 1 DATA SELECT 2 TM ADD 2 TMADDP TM ADD 3 CASE TM ADD 4 CT1775 51 68 50 67 49 66 48 65 47 64 46 63 45 62 44 61 43 60 42 59 41 58 40 57 39 56 38 55 37 54 36 53 35 52 FUNCTION PIN # 1 GND 35 TMADDP 2 +5V OSC/ CLOCK PWR 36 CHAN SELECT 3 N/C 37 ODD PARITY 4 TX INHIBIT 38 D15 5 SYNC SELECT 39 D13 6 SERIAL DATA OUT 40 D11 7 ESC OUT 41 D9 8 N/C 42 D7 9 COMM / DATA SYNC 43 D5 10 MRST 44 D3 11 VALIDWORD 45 D1 12 BIT STATUS 46 LOAD DATA 2 13 LATCH DATA 1 47 +5V 14 VAL CMDWD 48 +Vcc 15 BDCST INH 49 RX DATA IN 16 TM ADD 1 50 RXSTROBE 17 TM ADD 3 51 TX DATA OUT 18 XTAL 52 CASE 19 CLOCK OUT 53 DATA SELECT 2 20 TAKE DATA 54 DATA SELECT 1 21 DECR ST 55 ENA PAR CHECK 22 DSC OUT 56 D14 23 SEND DATA 57 D12 24 CLOCK IN 58 D10 25 S/T SELECT 59 D8 26 FAIL-SAFE 60 D6 27 RT ENABLE 61 D4 28 MODE CODE 62 D2 29 LATCH DATA 2 63 D0 30 ENC ENABLE 64 LOAD DATA 1 31 BROADCAST 65 GND 32 TM ADD 0 66 -Vc c 33 TM ADD 2 67 RX DATA IN 34 TM ADD 4 68 TX DATAOUT FIGURE 3 – PIN CONNECTION DIAGRAM, CT1775 AND PINOUT TABLE SCDCT1775 Rev B 13 FUNCTION ORDERING INFORMATION MODEL NUMBER CT1775 SCREENING Military Temperature, -55°C to +125°C, Screened to the individual test methods of MIL-STD-883 PLUG IN PACKAGE OUTLINE POWER SUPPLY PACKAGE +5V, ±12V to ±15V Plug in 1.850 1.590 Lead 1 & ESD Designator 1.600 .100 .095 Pin 2 Pin 1 .050 Pin 16 TYP Pin 17 .190 MAX Pin 34 Pin 18 .018 DIA TYP 1.400 1.200 Pin 68 Pin 52 Pin 51 Pin 50 .100 TYP Pin 35 Pin 36 1.600 .180 MIN PLAINVIEW, NEW YORK Toll Free: 800-THE-1553 Fax: 516-694-6715 INTERNATIONAL Tel: 805-778-9229 Fax: 805-778-1980 NORTHEAST Tel: 603-888-3975 Fax: 603-888-4585 SE AND MID-ATLANTIC Tel: 321-951-4164 Fax: 321-951-4254 WEST COAST Tel: 949-362-2260 Fax: 949-362-2266 CENTRAL Tel: 719-594-8017 Fax: 719-594-8468 www. a e ro fl e x. com i nfo- a ms@ a e rofl e x. com Aeroflex Microelectronic Solutions reserves the right to change at any time without notice the specifications, design, function, or form of its products described herein. All parameters must be validated for each customer's application by engineering. No liability is assumed as a result of use of this product. No patent licenses are implied. Our passion for performance is defined by three attributes represented by these three icons: solution-minded, performance-driven and customer-focused SCDCT1775 Rev B 14