MT34013 Просмотр технического описания (PDF) - Aeroflex Corporation

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MT34013

EIGHT CHANNEL ARINC DECODER

Aeroflex Corporation 

FIG. 3 MULTICHANNEL ARINC 429 RECEIVER OUTPUT TIMING

MT34013

T

tON

tv

tSH (MIN)

tSL (MIN)

tc

tOFF

tCE (MIN)

tCEDRH

Clock Period (500 - 800nS).

Min

NOT CHIP ENABLE low to output active time.

10nS

NOT OUTPUT SELECT low to word valid time.

minimum NOT OUTPUT SELECT high time.

minimum NOT OUTPUT SELECT low time.

NOT CHIP ENABLE high to DATA READY low time. 100nS

NOT CHIP ENABLE high to data bus high impedance time. 20nS

minimum time NOT CHIP ENABLE high/low.

2.5T

minimum time to select next word (CHIP ENABLE high

to DATA READY high).

4T + 20nS

Max

250nS

300nS

400nS

400nS

2T + 500nS

100nS

6T + 300nS

Notes:-

(1) The CHIP ENABLE line going high during the select timing resets DATA READY and terminates the read

action. Not all 3 words (or 5 bytes) need to be accessed and read termination can take place at any time.

(2) The output timing for the 8 bit parallel bus is similar to the above but with 5 byte accesses required.

(3) The NOT CHIP ENABLE line cannot be held permanently low (see (1)).

(4) All timings are theoretical and are based on a load of 100pF and one standard TTL input.

(5) The NOT OUTPUT SELECT line only affects the chip when NOT CHIP ENABLE is low.

(6) In BYTE mode, NOT CHIP ENABLE low to NOT OUTPUT SELECT low, (tsu) must be > 100nS to ensure

correct BYTE output sequence.

VLSI COMPONENTS FOR ARINC 429 DATA TRANSMISSION SYSTEMS

7

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