ACT4468D Dual Transceivers for MIL-STD-1553 Features • World’s smallest and lowest standby power dual transceiver 0.3" x 1" packages • Dual transceiver meets military data bus requirements, MIL-STD-1553 and MIL-STD-1760 • Low power dissipation at full output power • Single +5V power supply • Current source output • Monolithic construction using dielectrically isolated(D.I.) • Processed and screened to MIL-STD-883 specs • DESC SMD# 5962–92061 Pending CIRCUIT TECHNOLOGY www.aeroflex.com General Description The Aeroflex Circuit Technology Model ACT4468D is a next generation D.I. monolithic transceiver which provide full compliance with MIL-STD-1553/1760 and data bus requirements in the smallest packages with the lowest standby power consumption and one power supply operation. The dual channel Model ACT4468D perform the front-end analog function of inputting and outputting data through a transformer to a MIL-STD-1553/1760 data bus. Design of these transceivers reflects particular attention to active filter performance. This results in low bit and word error rate with superior waveform purity and minimal zero crossover distortion. Efficient transmitter electrical and thermal design provides low internal power dissipation and heat rise at high as well as low duty cycles. Each channel of the dual transceiver is completely separate from the other and fully independent. This includes power leads as well as signal lines. Hence, each channel may be connected to a different data bus with no interaction. ACT4468D Dual Transceiver TX/RX TX DATA IN DRIVER SHAPING TX DATA IN OUTPUT STAGE TX/RX TX INHIBIT +5 V REFERENCE COMP. ACTIVE FILTER COMP. RX DATA OUT GROUND INPUT AMP RX DATA OUT STROBE Block Diagram (without Transformer), 1/2 of unit shown Transmitter: The Transmitter section accepts bi-phase TTL data at the input and when coupled to the data bus with a 1:2.5 transformer, isolated on the data bus side with two 52.5 Ohm fault isolation resistors, and loaded by two 70 Ohm terminations plus additional receivers, the data bus signal produced is 7.5Volts nominal P-P at A-A’. (See Figure 5.) When both DATA and DATA inputs are held low or high, the transmitter output becomes eroflex Circuit Technology – Data Bus Modules For The Future © SCD4468D REV B 5/25/00 a high impedance and is “removed” from the line. In addition, an overriding “INHIBIT" input provides for the removal of the transmitter output from the line. A logic “1” applied to the “INHIBIT” takes priority over the condition of the data inputs and disables the transmitter. (See Transmitter Logic Waveform, Figure 1.) The transceiver utilizes an active filter to suppress harmonics above 1MHz. The Transmitter may be safely operated at 100% duty cycle for an indefinite period into a short circuited 1553 bus. Receiver: The Receiver section accepts bi-phase differential data at the input and produces two TTL signals at the output. The outputs are DATA and DATA, and represent positive and negative excursions of the input beyond a pre-determined threshold.(See Receiver Logic Waveform. Figure 2.) CIRCUIT TECHNOLOGY The pre-set internal thresholds will detect data bus signals exceeding 1.150 Volts P-P and reject signals less than 0.6 volts P-P when used with a 1:2.5 turns ratio transformer. (See Figure 5 for transformer data and typical connection.) Figure 1. Transmitter Logic Waveforms DATA IN DATA IN INHIBIT LINE TO LINE OUTPUT NOTES: 1.DATA and DATA inputs must be complementary waveforms or 50% duty cycle average, with no delays between them. 2.DATA and DATA must be in the same state during off time (both high or low). Figure 2. Receiver Logic Waveforms LINE TO LINE INPUT DATA OUT DATA OUT Note overlap NOTE: Waveforms shown are for normally low devices. For normally high receiver output level devices, the receiver outputs are swapped as shown by the dashed lines. Aeroflex Circuit Technology 2 SCD4468D REV B 5/25/00 Plainview NY (516) 694-6700 Absolute Maximum Ratings Operating Case Temperature -55°C to +125°C Storage Case Temperature -65°C to +150°C Positive Power Supply Voltage -0.3 V to +7.0 V Receiver Differential Input ±10 V Receiver Input Voltage (Common Mode) ±5 V Driver Peak Output Current 650 mA Total Package Power Dissipation over the Full Operating Case Temperature Rise 2 Watt (Note: Normal operation conditions require one transmitter on and the other off at any given time. Maximum Junction To Case Temperature Rise for the Hottest Device 10°C Thermal Resistance, Junction to Bottom of Case 5°C/W Electrical Characteristics – Driver Section Input Characteristics, TX DATA in or TX DATA in Parameter Condition Symbol Min Typ Max Unit "0" Input Current VIN = 0.4 V IILD -0.2 -0.4 mA "1" Input Current VIN = 2.7 V IIHD 1 40 µA 0.7 V "0" Input Voltage VIHD "1" Input Voltage VIHD 2.0 V Inhibit Characteristics "0" Input Current VIN=0.4V "1" Input Current VIN=2.7V IILI -0.2 -0.4 mA IIHI 1.0 40 µA 0.7 V "0" Input Voltage VILI "1" Input Voltage VIHI V 2 Delay from TX inhibit,(0→1) to inhibited output tDXOFF 200 300 Delay from TX inhibit, (1→0) to active output tDXON 80 150 Differential Output Noise, inhibit mode VNOI 2 10 Differential Output Impedance (inhibited) Note 1 ZOI RL=35 Ω VO nS nS mV p-p Ω 2K Output Characteristics Differential output level Rise And Fall Times(10% to 90% of p-p output) Output Offset at point A-A’on Fig 5., 2.5 µS after midpoint crossing of the parity bit of the last word of a 660 µS message tr RL=35 Ω Delay from 50% point of TX DATA or TX DATA input to zero crossing of differential signal 6.5 7.5 100 170 VOS 8.0 300 ±90 tDTX 100 150 V p-p nS mV peak nS Note 1. Power ON/OFF, measured from 75KHz to 1MHz at Point A-A. See Figure 5 Aeroflex Circuit Technology 3 SCD4468D REV B 5/25/00 Plainview NY (516) 694-6700 Electrical Characteristics – Receiver Section Parameter Condition Differential Voltage Range, Figure 4 Point P-P’ Symbol Min Typ VIDR Common Mode Rejection Ratio CMRR Max Unit 20 V peak 45 dB Strobe Characteristics (Logic "0" inhibits output) if not used, a 1K pullup to 5 V is recommended "0" Input Current VS=0.4 V IIL -0.2 -0.4 mA "1" Input Current VS=2.7V IIH 1 +40 µA 0.7 V "0" Input Voltage VIL "1" Input Voltage VIH V 2.0 Strobe Delay (turn-on) tSD(ON) 40 100 nS Strobe Delay (turn-off) tSD(OFF) 60 100 nS 1.15 V p-p Threshold Characteristics (Sinewave input ) 100KHz1MHz Input Threshold Voltage(referred to the bus) VTH 0.60 0.8 2.5 3.7 Output Characteristics, RX DATA and RX DATA "1" State IOH=-0.4 mA VOH "0" State IOL = 4 mA VOL 0.3 0.5 V tDRX 250 400 nS Delay, (average)from differential input zero crossings to RX DATA and RX DATA output 50% points V Power Data Maximum Currents, Per Channel (+5V) Duty Cycle Typ Max Transmitter Standby 20 mA 30 mA 25% duty cycle 155 mA 185 mA 50% duty cycle 290 mA 335 mA 100% duty cycle 560 mA 650 mA Power Supply Voltage +V 4.75 to 5.5 Volts Note 2. Vcc= 5 volts ±0.1 V, for all measurements unless otherwise specified. Note 3. Specifications apply over the case temperature range of -55°C to +125°C unless otherwise specfied. Note 4. All typical values are measured at +25°C Aeroflex Circuit Technology 4 SCD4468D REV B 5/25/00 Plainview NY (516) 694-6700 Figure 3 – Transmitter (TX) Output Waveform Figure 4 – Transmitter (TX) Output Offset LAST BIT tf* 90% Magnified View OUTPUT OFFSET* 6V P-P MIN 7.7V P-P MAX 0 Volts 0 volts OUTPUT OFFSET* 10% 2.5 µsec tr* *Offset measured at point A-A’ in Fig 5 * Rise and fall times measured at point A-A’ in Fig 5 Figure 6 – Power Dissipation vs. Duty Cycle (Total hybrid with one channel transmitting and the other not powered) Figure 5 – Typical Transformer Connection 70Ω 70Ω ZO 52.5Ω 1:2.5 P B A D.U.T TX DATA OUT Center Tap P’ 1:1.77 for stub coupling A’ B’ 52.5Ω POWER DISSIPATION MILLIWATTS TX DATA OUT 1600 1400 1200 Maximum 1000 800 Typical 600 400 RX DATA IN 200 RX DATA IN 0 0 10 20 30 40 50 60 70 80 90 100 DUTY CYCLE – PERCENT Note: Vcc = 5 Volts, Vbus (pt A-A') at 7.5 Volts P-P Configurations and Ordering Information DESC No. Receiver Data level Case Configuration ACT4468D 5962-92061(Pending) Normally Low DIP Package Dual ACT4468DF 5962-92061(Pending) Normally Low Flat Package Dual ACT4468DI 5962-92061(Pending) Normally High DIP Package Dual ACT4468DFI 5962-92061(Pending) Normally High Flat Package Dual Model No. Aeroflex Circuit Technology 5 SCD4468D REV B 5/25/00 Plainview NY (516) 694-6700 C I R C U I T T E C H N O L O G YCIRCUIT TECHNOLOGY Package Outline Drawings "FLAT Package" .990 1.010 .890 .910 ESD Triangle Identifies Pin 1 20 Pin #’s & Functions .008 .012 11 .290 .310 10 1 +5Vdc A 2 TX/RX A 3 TX/RX A 4 STROBE A 5 GROUND A 6 +5Vdc B 7 TX/RX B 8 TX/RX B 9 STROBE B 10 GROUND B 11 RX DATA OUT B 12 RX DATA OUT B 13 TX INHIBIT B 14 TX DATA IN B 15 TX DATA IN B 16 RX DATA OUT A 17 RX DATA OUT A 18 TX INHIBIT A 19 TX DATA IN A 20 TX DATA IN A .400 .016 .020 .050 .075 .098 .122 "DIP Package" .990 1.010 20 11 .287 .303 .300 10 .008 .012 ESD Triangle Identifies Pin 1 .025 .045 .150 .MIN .098 .122 .100 BSC .05 Notes 1. Dimensions shown are in inches .016 .020 .890 .910 Specifications subject to change without notice. Aeroflex Circuit Technology 35 South Service Road Plainview New York 11803 Aeroflex Circuit Technology Telephone: (516) 694-6700 FAX: (516) 694-6715 Toll Free Inquiries: 1-(800)THE-1553 6 SCD4468D REV B 5/25/00 Plainview NY (516) 694-6700