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HI-8783 Datasheet(PDF) 3 Page - Holt Integrated Circuits |
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HI-8783 Datasheet(HTML) 3 Page - Holt Integrated Circuits |
3 / 9 page HI-8783, HI-8784, HI-8785 The HI-8784 and HI-8785 have the same digital logic func- tion as the HI-8783, but include an on-chip line driver de- signed to directly drive the ARINC 429 bus. The two ARINC outputs (TXAOUT and TXBOUT) provide a differential volt- age to produce a +10 volt One, a -10 volt Zero, and a 0 volt Null. The slope of the ARINC outputs is controlled by the SLP1.5 pin. If SLP1.5 is high, the output rise and fall time is nominally 1.5us. If SLP1.5 is set low, the rise and fall times are 10us. DATA ONE and DATA ZERO outputs are not pro- vided for the HI-8784 and HI-8785. The HI-8784 has 37.5 ohms in series with each line driver out- put. The HI-8785 has 10.0 ohms in series. The HI-8785 is for applications where external series resistance is needed, typi- cally for lightning protection devices. FUNCTIONAL DESCRIPTION (Cont.) A0 Byte Data Bus ARINC Bits 1 Byte 1 D0 - D7 ARINC 1 - ARINC 8 0 Byte 2 D0 - D7 ARINC 9 - ARINC 16 0 Byte 3 D0 - D7 ARINC 17 - ARINC 24 0 Byte 4 D0 - D7 ARINC 25 - ARINC 32 Figure 2. Order of transmitted bytes Figure 1. Block Diagram DATA BUS 8to32bit mux 32 bit buffer register 32 bit shift register byte counter WRITE A0 8 32 32 status & control logic XMT RDY XMIT CLK word gap counter bit counter output logic line driver PARITY ENB DATA ZERO DATA ONE 561 DATA 561 SYNC TXBOUT TXAOUT SLP1.5 HI-8784, HI8785 HI-8783 POWER SUPPLY SEQUENCING The power supplies must be controlled to prevent large currents during supply turn-on and turn-off. The required sequence is V+ followed by VDD, always ensuring that V+ is the most positive supply. The V- supply is not critical and can be asserted at any time. HOLT INTEGRATED CIRCUITS 3 |
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