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HI-8382C Datasheet(PDF) 2 Page - Holt Integrated Circuits |
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HI-8382C Datasheet(HTML) 2 Page - Holt Integrated Circuits |
2 / 8 page FUNCTIONAL DESCRIPTION The SYNC and CLOCK inputs establish data synchronization utilizing two AND gates, one for each data input. Each logic input, including the power enable ( ) input, are TTL/CMOS compatible. Besides reducing chip current drain, also floats each output. However the overvoltage fuses and diodes of the HI-8382 are not switched out. Figure1 illustratesa typical ARINC 429 bus application. Three power supplies are necessary to operate the HI-8382; typically +15V, -15V and +5V. The chip also works with ±12V supplies. The +5V supply can also providea reference voltage that determines the output voltage swing. The differential output voltage swing will equal 2V . Ifa value of V other than +5V is needed,a separate +5V power supply is required for pin V . With the DATA (A) input ata 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 ata 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. STROBE STROBE REF REF OUT REF OUT REF OUT 1 A B A B A B at a The driver can be externally powered down by applyinga logic high to the input pin. If this feature is not being used, the pin should be tied to ground. The C and C pins are inputs to unity gain amplifiers. Therefore they must be allowed to swing to -5V. Provision to switch capacitors must be done with analog switches that allow voltages below their ground. STROBE A B Figure 2. FUNCTIONAL BLOCK DIAGRAM DATA (A) OUT DATA (B) INPUTS TO ARINC BUS B REF V 1 V SYNC CLOCK -V +V STROBE GND C C -15V +15V +5V HI-8382, HI-8383 Figure 1. ARINC 429 BUS APPLICATION DATA (A) DATA (B) SYNC CLOCK V1 STROBE LEVEL SHIFTER AND SLOPE CONTROL (A) LEVEL SHIFTER AND SLOPE CONTROL (B) CURRENT REGULATOR OUTPUT DRIVER (B) OUTPUT DRIVER (A) R /2 OUT R /2 OUT FA FB OVER VOLTAGE CLAMPS CL RL OUT B B C GND -V A C +V REF Not included on HI-8383 HOLT INTEGRATED CIRCUITS 2 |
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