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8126 TTL Logic & Example Circuits

The 8126 uses 74ABT245 octal bidirectional transceivers to provide TTL

input/output capabilities. Each bit is pulled to +5V through a 10K Ω pull-up resistor

to insure each bit is at a known state when not driven.

The inputs use positive logic and are active true. If an input is driven high (2V to

5.25V) it will read as a logical one (1), and if driven low (0V to 0.8V) it will read as a

logical zero (0). If an input is not driven, it will read as a one (1) due to the 10K Ω

pull-up resistors on each port.

The outputs use negative logic. Writing a zero (0) to an output corresponds to 5V,

while writing a one (1) to an output corresponds to 0V.

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Impulse 8112 Manuale Utente Pagina 36