ACT4423 DUAL TRANSCEIVER FOR MIL-STD-1553/1760 Features CIRCUIT TECHNOLOGY www.aeroflex.com • +5 / +12 Volt Power Supply Operation General Description • Eliminates Negative Power Supply • Low Power Dissipation • Small Size & Light Weight • Dual Transceivers Saves Space & Cost • Outstanding MIL-STD-1553 performance • Radiation Hard Dielectric Isolation Monolithic Construction for Severe Environments • Superior High Frequency Line Transient and Input Ripple Rejection • Input and Output TTL Compatible Design • Processed and Screened to MIL-STD-883 Specs • MIL-PRF-38534 Compliant Devices Available • DESC SMD (Standard Military Drawing) Pending TX DATA OUT TX DATA IN DRIVER TX DATA IN ACTIVE FILTER OUTPUT STAGE REFERENCE COMP. TX DATA OUT TX INHIBIT IN +5V (VL) +12V (VCC) RX DATA OUT The Aeroflex Circuit Technology ACT4423 is a next generation monolithic transceiver design which provides full compliance to MIL-STD-1553A/B and 1760 requirements in a small package with low power consumption. The ACT4423 series performs the front-end analog function of inputting and outputting data through a transformer to the MIL-STD-1553 data bus. Design of this transceiver 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. Transmitter: GND1 GND2 GND3 RX DATA IN RX DATA IN INPUT AMPLIFIER ACTIVE FILTER RX DATA OUT COMP. CASE RX STROBE IN Block Diagram (Without Transformer) The Transmitter section accepts bi-phase TTL data at the input and when coupled to the data bus with a 1:1 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 eroflex Circuit Technology – Data Bus Modules For The Future © SCD4423 REV B 6/3/99 typically 7.5 Volts P-P at point 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, an overriding “INHIBIT" input provides for the removal of the transmitter output from the line. A logic “1” signal 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) 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). The pre-set internal thresholds will detect data bus signals, point A Figure 5, 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). A low level at the RX Strobe input inhibits the DATA and DATA outputs. If unused, a 2K pull-up to +5 Volts is recommended. 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 (ACT4423) LINE TO LINE INPUT STROBE DATA OUT DATA OUT Note overlap Aeroflex Circuit Technology 2 SCD4423 REV B 6/3/99 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 VCC VL -0.3 V to +18 V -0.3 V to +7.0 V Logic input voltage -0.3 V to +5.5 V ±40 VP-P Receiver differential input Receiver input voltage (common mode) ±10 V Driver peak output current 300 mA Total package power dissipation over the full operating case temperature rise 2.5 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 4°C/W Electrical Characteristics — Driver Section Input Characteristics, TX DATA IN or TX DATA IN (Notes 2 & 3 apply) Parameter Condition "0" Input Current VIN = 0.4 V "1" Input Current VIN = 2.7 V Symbol Typ Max Unit IILD -0.1 -0.2 mA IIHD 1 40 µA 0.7 V "0" Input Voltage VIHD "1" Input Voltage VIHD Min 2.0 V Inhibit Characteristics "0" Input Current "1" Input Current VIN = 0.4 V IILI -0.1 -0.2 VIN=2.7V IIHI 1.0 40 "0" Input Voltage VILI "1" Input Voltage VIHI Delay from TX inhibit, (0→1) to inhibited output Delay from TX inhibit, (1→0) to active output From mid pt inhibit to ±1.2V pt B, See Figure 5 Differential output noise, inhibit mode Differential output impedance (inhibited) Note 1 See Figure 5 0.7 mA µA V V 2.0 tDXOFF 175 225 tDXON 90 150 VNOI 2 10 nS nS mV P-P Point B ZOI 2K Ω Point C ZOI 1K Ω Point A VO 6 7.5 9 Point A tr 100 160 300 nS Point A VOS ± 90 mV peak Point A tDXT 200 nS Output Characteristics Differential output level, See Figure 5 See Figure 5 Rise and fall times(10% to 90% at pt A output) See Figure 5 Output offset, Figure 3, 2.5µS after midpoint crossing of the parity bit of the last word of a 660µS message See Figure 5 Delay from 50% point of TX DATA or TX DATA input to zero crossing of differential signal. See Fig 5 Aeroflex Circuit Technology 3 100 VP-P SCD4423 REV B 6/3/99 Plainview NY (516) 694-6700 Electrical Characteristics — Receiver Section Parameter Differential Receiver Input Voltage Range (See Figure 5, Point B) Condition Symbol TXFMR 1:1 VIDR Common Mode Rejection Ratio (Note 3) CMRR Min Typ Max Unit 40 VP-P 45 dB "1" State – Rx Data or Rx Data Output IOH = -0.4 mA VOH "0" State – Rx Data or Rx Data Output IOI = 4 mA VOL 0.35 0.5 V tDXT 270 400 nS 0.75 1.20 VP-P Delay (average) from Differential Input Zero Crossings to RX DATA and RX DATA Output 50% points Input Threshold Voltage (referred to the bus) 100KHz–1MHz VTH 2.5 0.60 3.7 V Strobe Characteristics (Logic "0" Inhibits Output) "0" Input Current VS=0.4V IIL -0.1 "1" Input Current VS=2.7V IIH 1 "0" Input Voltage VIL "1" Input Voltage VIH Strobe Delay (Turn-on or Turn-off) tSD -0.2 mA +40 µA 0.7 V V 2.0 50 100 nS Power Data Power Supply Currents – Per Channel – See Figure 4 ICC IL ICC IL ICC IL ICC IL Transmitter Standby 25% duty cycle 50% duty cycle 100% duty cycle 0 18 30 30 75 18 120 18 210 18 80 30 130 30 230 30 mA Power Supply Voltages +12V Operating Power Supply Voltage Range VCC +5V Operating Power Supply Voltage Range) VL +14.25 +15.00 +15.75 V +4.75 V +5.00 +5.25 Note 1. Power on or off, measured from 75KHz to 1MHz at point A and transformer self impedance of 3KΩ minimum at 1MHz. Note 2: Power Supplies: +12 Volts ±0.75 V & +5 Volts ±0.25 V, bypassed by 10 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 as shown per Figure 5 with ± 10 Volt peak, line to ground, DC to 2MHz Note 4: Typical power is measured with VBUS at point A = 7.5 VP-P Aeroflex Circuit Technology 4 SCD4423 REV B 6/3/99 Plainview NY (516) 694-6700 Figure 3 – Transmitter (TX) Output Offset Figure 5 – Typical 1553 Bus Connections LAST BIT Transformer Coupled Stub 70Ω Magnified View ACT4423 OUTPUT OFFSET * OUTPUT OFFSET * TX DATA OUT 0 Volts 3 2 TX DATA OUT 2.5 µsec 1:1.4 52.5Ω 1.4:1 7 C A 1 5 T1553-2 52.5Ω RX DATA IN Zoi VCM RX DATA IN *Offset measured at point A in Figure 5 Direct Coupled Stub Figure 4 – Hybrid Power Dissipation vs. Duty Cycle (Total hybrid with one channel transmitting and the other not powered – 100% Duty Cycle) ACT4423 TX DATA OUT 3600 2 3200 52.5Ω 1:1 3 8 B A POWER DISSIPATION MILLIWATTS 2.97W 0.270 2800 2400 TX DATA OUT Typical Hybrid Input Power 1 4 T1553-2 RX DATA IN 2000 52.5Ω Zoi 1.87W 70Ω RX DATA IN 1600 1200 800 Typical Hybrid Dissipation 400 0 0 10 20 30 40 50 60 70 80 Transformer Model use Technitrol Part# 1553-1 or equivalent 90 100 DUTY CYCLE – PERCENT Note: Vcc= +12V, VL= +5V, Transformer ratio 1:1, VBUS (point A) at 7.5VP-P. Configurations and Ordering Information ACT Model # / Ordering Part # Case Style DESC Number Rx Standby ACT4423-D DIP Pending Normally Low ACT4423-DI DIP Pending Normally High ACT4423-DF FP Pending Normally Low ACT4423-DFI FP Pending Normally High Specifications subject to change without notice. Aeroflex Circuit Technology 5 SCD4423 REV B 6/3/99 Plainview NY (516) 694-6700 Figure 6 – Lead Numbers & Functions ACT4423 Aeroflex Circuit Technology Pin # Function Channel 1 TX DATA OUT A 2 TX DATA OUT A 3 GROUND 1 A 4 NC 5 RX DATA OUT A 6 STROBE A 7 GROUND 2 A 8 RX DATA OUT A 9 CASE 10 TX DATA OUT B 11 TX DATA OUT B 12 GROUND 1 B 13 NC 14 RX DATA OUT B 15 STROBE B 16 GROUND 2 B 17 RX DATA OUT B 18 NC 19 V CC B 20 RX DATA IN B 21 RX DATA IN B 22 GROUND 3 B 23 NC 24 +5 V (V L) B 25 INHIBIT B 26 TX DATA IN B 27 TX DATA IN B 28 V CC A 29 RX DATA IN A 30 RX DATA IN A 31 GROUND 3 A 32 NC A 33 +5 V (V L) A 34 INHIBIT A 35 TX DATA IN A 36 TX DATA IN A 6 SCD4423 REV B 6/3/99 Plainview NY (516) 694-6700 CIRCUIT TECHNOLOGY Model ACT4423 Dual In Line 1.90 MAX 0.085 1.70 .097 19 36 0.78 MAX 0.600 18 Pin 1 & ESD Designator 0.21MAX 0.24 MIN 0.018 DIA. ±0.002 Model ACT4423 Flat Package 0.78 MAX 19 18 0.015 ±0.002 1.90 MAX 0.10 Typ 36 0.097 0.086 R 4 Places 0.175 MAX Pin 1 & ESD Designator 0.010 ±0.002 0.40 MIN 2 SIDES 0.065 REF Notes 1. Dimensions shown are in inches 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: (800) THE-1553 E-Mail: [email protected] Aeroflex Circuit Technology 35 South Service Road Plainview New York 11830 www.aeroflex.com Aeroflex Circuit Technology 7 SCD4423 REV B 6/3/99 Plainview NY (516) 694-6700