ACT 4455 / 4459 SINGLE SUPPLY TRANSCEIVERS FOR MIL-STD-1553/1760 Features CIRCUIT TECHNOLOGY • Single 5 Volt Supply Operation www.aeroflex.com/act1.htm • Low Power Dissipation General Description: • Small Size & Light Weight • Single Transceiver Save Space & Cost • Outstanding MIL-STD-1553 performance • Processed and Screened to Mil-STD-883 Specs • Radiation Hard Dielectric Isolation Monolithic construction for Severe Environments • Superior High Frequency Line Transient and Input Ripple Rejection • Input and Output TTL Compatible Design • DESC SMD# 5962-96741 TX DATA OUT TX DATA IN DRIVER TX DATA IN ACTIVE FILTER OUTPUT STAGE REFERENCE COMP. ACTIVE FILTER COMP. TX DATA OUT TX INHIBIT +5 V RX DATA OUT +5V RTN RX DATA IN RX DATA IN INPUT AMPLIFIER RX DATA OUT STROBE Block Diagram (without Transformer) The Aeroflex Circuit Technology ACT4455 / 4459 series are next generation monolithic transceiver designs which provides full compliance with MIL-STD-1553A/B and 1760 requirements in the smallest packages with low power consumption and single power supply operation. The ACT4455 / 4459 series performs the front-end analog function of inputting and outputting data through a transformer to the MIL-STD-1553 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. Transmitter: The Transmitter section accepts bi-phase TTL data at the input and when coupled to the data bus with a 1:2.5 ratio transformer, isolated on the data bus side with two 52.5 Ohm fault isolation resistors, and loaded by two 70 Ohm terminations, the data bus signal is typically 7.5 Volts P-P at A-A' (See Figure 5). When both DATA and DATA inputs are held low or high, the transmitter output becomes a high impedance and is “removed” from the line. In addition, eroflex Circuit Technology – Data Bus Modules For The Future © SCD4455 REV A 1/29/98 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 Transmitter may be safely operated for an indefinite period with the bus (point A-A') short circuited at 100% duty cycle. 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.) A low level at the Strobe input inhibits the DATA and DATA outputs. If unused, a 2K pull-up to +5 Volts is recommended The pre-set internal thresholds will detect data bus signals exceeding 1.20 Volts P-P and reject signals less than 0.6 volts P-P when used with a transformer. (See Figure 5 for transformer data and typical connection.) Figure 1 — Transmitter Logic Waveforms Idealized* DATA IN DATA IN INHIBIT LINE TO LINE OUTPUT Note: DATA and DATA inputs must be complementary waveforms or 50% duty cycle average, with no delays between them, and must be in the same state during off times (both high or low). Figure 2 — Receiver Logic Waveforms Idealized* LINE TO LINE INPUT STROBE DATA OUT DATA OUT Note overlap * See Figure 8 For Actual Waveforms Aeroflex Circuit Technology 2 SCD4455 REV A 1/29/98 Plainview NY (516) 694-6700 Absolute Maximum Ratings Operating case temperature -55°C to +125°C Storage case temperature -65°C to +150°C Power supply voltage -0.3 V to +7.0 V Logic input voltage -0.3 V to +5.5 V Receiver differential input ±10 V Receiver input voltage (common mode) ±5 V Driver peak output current 600 mA Total package power dissipation over the full operating case temperature rise 2 Watts (Note: Normal operation conditions require one transceiver on and the other off.) Maximum junction to case temperature 10°C Thermal resistance – junction to case 5°C/W Electrical Characteristics — Driver Section Input Characteristics, TX DATA in or TX DATA in (Notes 2 & 3 apply) Parameter Condition Symbol "0" Input Current VIN = 0.4 V "1" Input Current VIN = 2.7 V Typ Max Unit IILD -0.2 -0.4 mA IIHD 1 40 µA 0.7 V "0" Input Voltage VILD "1" Input Voltage VIHD Min 2.0 V Inhibit Characteristics "0" Input Current VIN=0.4V "1" Input Current VIN=2.7V IILI IIHI "0" Input Voltage VILI "1" Input Voltage VIHI mA -0.2 -0.4 1.0 40 µA 0.7 V V 2.0 Delay from TX inhibit, (0→1) to inhibited output tDXOFF 250 350 nS Delay from TX inhibit, (1→0) to active output tDXON 150 250 nS Differential output noise, inhibit mode VNOI 2 10 mVP-P Differential output impedance (inhibited) Note 1 ZOI Ω 2K Output Characteristics Differential output level RL=35 Ω Rise and fall times(10% to 90% of P-P output) Output offset at point A-A' on Figure 5, 2.5µS after midpoint crossing of the parity bit of the last word of a 660µS message VO tr RL=35 Ω Delay from 50% point of TX DATA or TX DATA input to zero crossing of differential signal 6 7.5 9 VP-P 100 200 300 nS ± 90 mV peak 250 nS VOS tDTX 120 Note 1. Power on or off, measured from 75KHz to 1MHz at point A-A' and transformer self impedance of 3KΩ minimum Aeroflex Circuit Technology 3 SCD4455 REV A 1/29/98 Plainview NY (516) 694-6700 Electrical Characteristics — Receiver Section Parameter Condition Symbol TXFMR 2.12:1 VIDR Differential Receiver Input Voltage Range (See Figure 5, point P–P') Common Mode Rejection Ratio (Note 3) CMRR Min Typ Max Unit 14 20 VP-P 45 dB Strobe Characteristics (Logic "O" Inhibits Output) "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 Strobe Delay (Turn-on or Turn-off) tSD V 2.0 50 100 nS 1.10 V P-P Threshold Characteristics (Sinewave Input) Input Threshold Voltage (referred to the bus) 100KHz–1MHz VTH 0.60 0.82 2.5 3.7 Output Characteristics – RX DATA and RX DATA "1" State IOH = -0.4 mA VOH "0" State IOL = -4.0 mA VOL 0.35 0.5 V tDRX 340 500 nS 18 30 150 175 50% duty cycle 300 350 100% duty cycle 600 700 +5.00 +5.50 Delay, (average) from Differential Input Zero Crossings to RX DATA and RX DATA Output 50% points V Power Data Power Supply Currents – Per Channel Transmitter Standby 25% duty cycle Note 4 mA ICC Power Supply Voltage VCC Operating Power Supply Voltage Range +4.75 V Note 2: Vcc = 5 Volts ±0.1 V, bypassed by 2.2 µF (Tantalum recommended) Capacitor minimum. All measurements & specifications apply over the temperature range of -55°C to +125°C (case temperature) unless otherwise specified. Note 3: When measured at point A-A’ with ± 10 Volt peak, line to ground, DC to 2MHz Note 4: Typical power is measured with Vbus at point A-A’ = 7.5 VP-P Aeroflex Circuit Technology 4 SCD4455 REV A 1/29/98 Plainview NY (516) 694-6700 Figure 3 – Transmitter (TX) Output Wave form Figure 4 – Transmitter (TX) Output offset LAST BIT tf* 90% Magnified View 6V P-P MIN 9V P-P MAX 0 Volts OUTPUT OFFSET * OUTPUT OFFSET * 0 volts 10% 2.5 µsec tr* *Offset measured at point A-A' in Figure 5 * Rise and fall times measured at point A-A' in Figure 5 Figure 5 – Typical direct transformer connection 70Ω Figure 6 – Power Dissipation vs. Duty Cycle (Total hybrid with one channel transmitting and the other not powered) 70Ω 2000 N1:N2 TX DATA OUT P B A Center Tap TX DATA OUT P' POWER DISSIPATION MILLIWATTS 1800 52.5Ω N1:N3 for Stub Coupling A' B' 52.5Ω 1600 1400 1200 Maximum 1000 Typical 800 RX DATA IN 600 RX DATA IN 400 200 Transformer turns ratios: N1:N2 = 1:2.5 N1:N3 = 1:1.77 Use Technitrol 1553-45 or equivalent Aeroflex Circuit Technology 0 0 10 20 30 40 50 60 70 80 90 100 DUTY CYCLE – PERCENT Note:Vcc=5 Volts,Transformer ratio 1:2.5, Vbus (pt A-A') at 7.5 Volts P-P 5 SCD4455 REV A 1/29/98 Plainview NY (516) 694-6700 Figure 8 ACTUAL HYBRID WAVEFORMS* — 25°C TYPICAL START OF WORD – 33 WORD TRANSMISSION TX DATA IN CH 2 BUS OUT Point A–A' See Figure 5 CH 1 RX DATA OUT CH 3 RX DATA OUT CH 4 END OF WORD – 33 WORD TRANSMISSION TX DATA IN CH 2 BUS OUT Point A–A' See Figure 5 CH 1 RX DATA OUT CH 3 RX DATA OUT CH 4 * Oscilloscope used is a TEK TDS540 with Probe 6139A. Aeroflex Circuit Technology 6 SCD4455 REV A 1/29/98 Plainview NY (516) 694-6700 Figure 7 – Pin Numbers & Functions ACT4455/4459 Pin # Aeroflex Circuit Technology Function 1 TX DATA OUT 2 +5V 3 +5V 4 TX DATA OUT 5 TX DATA OUT 6 GROUND 1 7 NC 8 NC 9 +5V 10 RX DATA OUT 11 STROBE 12 NC 13 RX DATA OUT 14 NC 15 +5V 16 GROUND 3 17 NC 18 RX DATA IN 19 RX DATA IN 20 NC 21 NC 22 GROUND 4 23 +5V 24 INHIBIT 25 TX DATA IN 26 TX DATA IN 27 GROUND 2 28 TX DATA OUT 7 SCD4455 REV A 1/29/98 Plainview NY (516) 694-6700 CIRCUIT TECHNOLOGY Configurations and Ordering Information Model No. DESC No. ACT 4455 5962-96741 ACT 4459 5962-96741 Receiver Data level Case Configuration Normally Low Rx LCC Single Normally High Rx LCC Single ACT4455/4459 LCC LEADLESS CHIP CARRIER 0.055 0.045 0.055 0.045 0.028 0.022 0.055 0.045 0.458 0.442 0.100 MAX 0.458 0.442 Notes 2. Pins are equally spaced at 0.100±0.002 tolerance, non-cumulative, each row Telephone: (516) 694-6700 FAX: (516) 694-6715 Toll Free Inquiries: 1-(800)THE-1553 Aeroflex Circuit Technology 35 South Service Road Plainview New York 11830 Specifications subject to change without notice. Aeroflex Circuit Technology 8 SCD4455 REV A 1/29/98 Plainview NY (516) 694-6700