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HI-8787 Datasheet(PDF) 3 Page - Holt Integrated Circuits |
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HI-8787 Datasheet(HTML) 3 Page - Holt Integrated Circuits |
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3 / 7 page 
A0 Load Data Bus ARINC Bits 1 Word 1 D0- D15 ARINC1- ARINC 16 0 Word 2 D0- D15 ARINC 17- ARINC 32 Figure 2. Order of transmitted data Figure 1. Block Diagram DATA BUS 16 to 32 bit mux 32 bit buffer register 32 bit shift register WRITE A0 16 32 32 status & control logic XMT RDY XMIT CLK word gap counter bit counter output logic line driver PARITY ENB 561 DATA 561 SYNC TXBOUT TXAOUT SLP1.5 FUNCTIONAL DESCRIPTION (Cont.) The HI-8787 and HI-8788 have an on-chip line driver de- signed to directly drive the ARINC 429 bus. The two ARINC outputs (TXAOUT and TXBOUT) providea differential volt- age to producea +10 volt One,a -10 volt Zero, anda0 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 1.5 s. .If SLP1.5 is set low, the rise and fall times are 10 s. The HI-8787 has 37.5 ohms in series with each line driver output. The HI-8788 has 10.0 ohms in series. The HI-8788 is for applications where external series resistance is needed, typically for lightning protection devices. µ µ HOLT INTEGRATED CIRCUITS 3 |
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