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HI-3185PSI-N Datasheet(PDF) 2 Page - Holt Integrated Circuits |
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HI-3185PSI-N Datasheet(HTML) 2 Page - Holt Integrated Circuits |
2 / 6 page FUNCTIONAL DESCRIPTION The SYNC and CLOCK inputs establish data synchronization utilizing two AND gates, one for each data input (figure 2). Each logic input is TTL/CMOS compatible. Figure 1 illustrates a typical ARINC 429 bus application. Three power supplies are necessary to operate the HI-318X; typically +15V, -15V and +5V. The chip also works with ±12V supplies. The +5V supply can also provide a reference voltage that determines the output voltage swing. The differential output voltage swing will equal 2V . If a value of V other than +5V is needed, a separate +5V power supply is required for pin V . With the DATA (A) input at a logic high and DATA (B) input at a logic low, A will switch to the +V rail and B will switch to the -V rail (ARINC HIGH state). With both data input signals at a logic low state, the outputs will both switch to 0V (ARINC NULL state). The driver output impedance, R , is nominally 75 ohms. The rise and fall times of the outputs can be calibrated through the selection of two external capacitor values th re connected to the C and C input pins. Typical values for high-speed operation (100KBPS) are C = C = 75pF and for low-speed operation (12.5 to 14KBPS) C = C = 500pF. REF REF OUT REF OUT REF OUT 1 AB AB AB at a The C and C pins swing between +5V and ground allowing the switching of capacitor values with an external single- supply analog switch. AB The ARINC outputs of the HI-3182, are protected by internal fuses capable of sinking between 800 - 900 mA for short periods of time (125 s). m The Vref pin has an internal pull-up resistor to V+, allowing the use of a simple external zener diode to set the reference voltage. POWER SUPPLY SEQUENCING The power supplies should be controlled to prevent large currents during supply turn-on and turn-off. The recommended sequence is +V followed by V , always ensuring that +V is the most positive supply. The -V supply is not critical and can be asserted at any time. 1 HI-3182PSx-N, HI-3185PSx-N DATA (A) OUT DATA (B) INPUTS TO ARINC BUS A OUT B REF V 1 V SYNC CLOCK -V +V GND B A C C -15V +15V +5V Figure 1. ARINC 429 BUS APPLICATION Figure 2. FUNCTIONAL BLOCK DIAGRAM OUT B CL REF FA RL FB OUT A OUTPUT DRIVER (B) OUTPUT DRIVER (A) B C GND -V DATA (A) DATA (B) SYNC CLOCK V1 A C V +V LEVEL SHIFTER AND SLOPE CONTROL (B) LEVEL SHIFTER AND SLOPE CONTROL (A) CURRENT REGULATOR 13 W 13 W 24.5 W Shorted on HI-3185PSx-N 24.5 W HOLT INTEGRATED CIRCUITS 2 |
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