Standard Products ACT4487 Single Transceiver for MIL-STD-1553A/B, MIL-STD-1760 & SAE-AS15531 www.aeroflex.com/Avionics February 14, 2008 FEATURES ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ Small size, light weight and low power dissipation, single transceiver +5V / ±15V DC power supply operation Outstanding MIL-STD-1553 / SAE-AS15531 performance Monolithic construction Input and output TTL compatible design Designed for commercial, industrial and aerospace applications MIL-PRF-38534 compliant devices available Aeroflex-Plainview is a Class H & K MIL-PRF-38534 manufacturer GENERAL DESCRIPTION The Aeroflex-Plainview ACT4487 is the next generation monolithic transceiver design which provides full compliance with MIL-STD-1553A/B, MIL-STD-1760 and meets SAE-AS15531 requirements in the smallest package with lower pin count for those designs with less board space. The ACT4487 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. TRANSMITTER The transmitter section accepts bi-phase TTL data at the input and when coupled to the data bus with a 1.4:1 ratio transformer the data bus signal is 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” applied to the “INHIBIT” takes priority over the condition of the data inputs and disables the transmitter (See Figure 1 Transmitter Logic Waveform). 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 Figure 2 Receiver Logic Waveform). 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 connections). A low level at the Strobe input inhibits the DATA and DATA outputs. If unused, a 2K pull-up to +5 Volts is recommended. SCD4487 Rev F TX DATA IN TX DATA OUT DRIVER TX DATA IN ACTIVE FILTER OUTPUT STAGE TX DATA OUT REFERENCE COMP. RX DATA OUT ACTIVE FILTER COMP. TX INHIBIT +5 V (VL) +15 V (+Vcc) -15 V (-VEE) GND CASE RX DATA IN RX DATA IN INPUT AMPLIFIER RX DATA OUT RX STROBE BLOCK DIAGRAM (WITHOUT TRANSFORMER) 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 1 – TRANSMITTER LOGIC WAVEFORMS IDEALIZED LINE TO LINE INPUT STROBE DATA OUT DATA OUT Note overlap Note: Outputs shown are for ACT4487 and are Inverted for the ACT4487-I. FIGURE 2 – RECEIVER LOGIC WAVEFORMS IDEALIZED SCD4487 Rev F 2/14/08 2 Aeroflex Plainview ABSOLUTE MAXIMUM RATINGS Operating case temperature -55°C to +125°C Storage case temperature -65°C to +150°C Power supply voltage VCC VEE VL -0.3 VDC to +18 VDC +0.3 VDC to -18 VDC -0.3 VDC to +7.0 VDC Logic input voltage -0.3VDC to +5.5VDC Receiver differential input ±40 Vp-p Receiver input voltage (common mode) ±10V Driver peak output current 200 mA Total package power dissipation over the full operating case temperature range 2.5 Watt 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 Symbol Min Typ Max Unit "0" Input Current VIN = 0.4V IILD - -0.2 -0.2 mA "1" Input Current VIN = 2.7V IIHD - 1 40 µA "0" Input Voltage VILD - - 0.7 V "1" Input Voltage VIHD 2.0 - - V INHIBIT CHARACTERISTICS "0" Input Current VIN = 0.4V IILI - -0.1 -0.2 mA "1" Input Current VIN = 2.7V IIHI - 1.0 40 µA "0" Input Voltage VILI - - 0.7 V "1" Input Voltage VIHI 2 - - V Delay from TX inhibit, (0➝1) to inhibited output tDXOFF - 175 200 nS Delay from TX inhibit, (1➝0) to active output tDXON - 90 200 nS Differential Output Noise, inhibit mode VNOI - 2 10 mVp-p Point B ZOI 2K - - Ω Point C ZOI 1K - - Ω Figure 5 Point A VO 6 7.5 9 Vp-p tr 100 200 300 nS Output offset. See Figure 3. 2.5 µS after midpoint crossing of the parity bit of the last word of a 660µS message. VOS - - ±90 mVpeak Delay from 50% point of TX DATA or TX DATA input to zero crossing of differential signal tDTX - 100 200 nS Differential Output Impedance (inhibited) Note 1 See Figure 5 OUTPUT CHARACTERISTICS Differential output level Rise and fall times (10% to 90% of p-p output) SCD4487 Rev F 2/14/08 3 Aeroflex Plainview ELECTRICAL CHARACTERISTICS – RECEIVER SECTION Parameter Differential Voltage Range (See Figure 5, Point B) Condition Symbol Min Typ Max Unit TXFMR 1.4:1 VIDR - 14 20 Vpk CMRR 45 - - dB Common Mode Rejection Ratio (Note 3) "1" State – Rx Data or Rx Data Output IOH = -0.4 mA VOH 2.5 3.7 - V "0" State – Rx Data or Rx Data Output IOI = 4 mA VOL - 0.35 0.5 V tDRX - 270 400 nS VTH 0.60 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 STROBE CHARACTERISTICS (LOGIC "0" INHIBITS OUTPUT) "0" Input Current VS = 0.4V IIL - -0.1 -0.2 mA "1" Input Current VS = 2.7V IIH - 1 +40 µA "0" Input Voltage VIL - - 0.7 V "1" Input Voltage VIH 2.0 - - V Strobe Delay (Turn-on or Turn-off) tSD - 50 100 nS POWER DATA POWER SUPPLY CURRENTS Transmitter Standby Note 4 ICC IEE IL - 0 12 18 1 16 30 25% Duty Cycle ICC IEE IL - 45 12 18 50 20 30 50% Duty Cycle ICC IEE IL - 90 12 18 100 20 30 100% Duty Cycle ICC IEE IL - 180 12 18 200 20 30 mA POWER SUPPLY VOLTAGE ±15V Operating Power Supply Voltage Range VCC VEE +14.25 -14.25 +15.00 +15.75 -15.00 -15.75 V V +5V Operating Power Supply Voltage Range VL +4.50 +5.00 V +5.50 NOTES: 1. Power on or off, measured from 75KHz to 1MHz at Point A and transformer self impedance of 3KΩ minimum at 1MHz. 2. Power Supplies: ±15VDC ±0.75V & +5VDC ±0.5V, bypassed by 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. 3. When measured as shown in Figure 5 with ±10Vp, line to ground, DC to 2MHz. 4. Typical power is measured with Vbus at Point A = 7.5 Vp-p. SCD4487 Rev F 2/14/08 4 Aeroflex Plainview LAST BIT Magnified View * OUTPUT OFFSET 0 Volts * OUTPUT OFFSET Transformer Coupled Stub 70Ω 2.5 µsec ACT4487 TX DATA OUT *Offset measured at Point A in Figure 5 1:1.4 52.5Ω 2:1 3 7 2 FIGURE 3 – TRANSMITTER (TX) OUTPUT OFFSET TX DATA OUT C A 1 5 T1553-2 52.5Ω RX DATA IN Zoi VCM RX DATA IN Direct Coupled Stub ACT4487 TX DATA OUT 2 TX DATA OUT 3600 RX DATA IN 3200 2.97W POWER DISSIPATION MILLIWATTS 1.87W 52.5Ω Zoi 70Ω Transformer Model use Technitrol Part# 1553-2 or equivalent 1600 1200 800 FIGURE 5 – TYPICAL 1553 BUS CONNECTIONS Typical Hybrid Dissipation 400 0 0 4 1 T1553-2 A Typical Hybrid Input Power 2000 0.270 B RX DATA IN 2800 2400 52.5Ω 1.4:1 8 3 10 20 30 40 50 60 70 80 90 100 DUTY CYCLE – PERCENT Note: Vcc= +15V, VEE = -15V, VL= +5V, Transformer ratio 1.4:1, VBUS (Point A) at 7.5VP-P. FIGURE 4 – POWER DISSIPATION VS. DUTY CYCLE SCD4487 Rev F 2/14/08 5 Aeroflex Plainview PIN NUMBERS & FUNCTIONS Pin # SCD4487 Rev F 2/14/08 Function 1 TX DATA OUT 2 TX DATA OUT 3 GROUND 4 NC 5 NC 6 NC 7 RX DATA OUT 8 STROBE 9 GROUND 10 RX DATA OUT 11 NC 12 NC 13 VCC 14 NC 15 RX DATA IN 16 RX DATA IN 17 NC 18 CASE 19 VEE 20 +5 V 21 TX INHIBIT 22 TX DATA IN 23 TX DATA IN 24 NC 6 Aeroflex Plainview CONFIGURATIONS AND ORDERING INFORMATION Model No. Receiver Data level ACT 4487 Normally Low ACT 4487-I Normally High ACT 4487-F Normally Low ACT 4487-FI Normally High Case Configuration Plug In Single Flat Package PACKAGE CONFIGURATION OUTLINES Plug In Package Outline Flat Package Outline .200 MAX. .065 1.315 MAX. 1.385 MAX. 24 .015 13 0.805 MAX. 24 0.600 0.735 MAX. 12 Pin 1 & ESD Designator 13 Lead 1 & ESD Designator 12 .375 MIN. 0.200 MAX. .240 MIN .015 .100 .100 .010 1.100 (11 Equal Spaces at .100) .018 1.100 (11 Equal Spaces at .100) Notes 1. Dimensions shown are in inches 2. Pins are equally spaced at 0.100±0.002 tolerance, non-cumulative, each row 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.aeroflex.com [email protected] 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 SCD4487 Rev F 2/14/08 7