Rainbow-electronics AT89C5122 Manual de usuario descargar pdf (Pagina 200)

200

AT8xC5122/23

4202E–SCR–06/06

This diagram indicates when signals are clocked internally. The time it takes the signals

to propagate to the pins, however, ranges from 25 to 125 ns. This propagation delay is

dependent on variables such as temperature and pin loading. Propagation also varies

from output to output and component. Typically though (T

=25°C fully loaded) RD and

propagation delays are approximately 50 ns. The other signals are typically 85 ns.

Propagation delays are incorporated in the AC specifications.

USB Interface

Rise Time Fall Time

CRS

Differential

Data Lines

90%

10%

90%

10%

VHmin

VLmax

Symbol Parameter Min Typ

(5)

Max Unit

Rise Time 4 20 ns

Fall Time 4 20 ns

FDRATE

Full-speed Data Rate 11.9700 12.0300 Mb/s

CRS

Crossover Voltage 1.3 2.0 V

DJ1

Source Jitter Total to next transaction -3.5 3.5 ns

DJ2

Source Jitter Total for paired

transactions

-4 4 ns

JR1

Receiver Jitter to next transaction -18.5 18.5 ns

JR2

Receiver Jitter for paired transactions -9 9 ns

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Rainbow-electronics AT89C5122 Manual de usuario Pagina 200