Rainbow-electronics T89C51CC02 Manual de usuario descargar pdf (Pagina 133)

Rev.A - May 17, 2001 133

Preliminary

T89C51CC02

19.4. AC Parameters

19.4.1. Explanation of the AC Symbols

Each timing symbol has 5 characters. The first character is always a “T” (stands for time). The other characters,

depending on their positions, stand for the name of a signal or the logical status of that signal. The following is

a list of all the characters and what they stand for.

TA = -40°Cto+85°C; V

=0V;V

=5V±10%;F=0to40MHz.

TA = -40°Cto+85°C; V

=0V; V

=5V± 10%.

(Load Capacitance for all outputs = 60 pF.)

Table 29 give the frequency derating formula of the AC parameter for each speed range description. To calculate

each AC symbols. take the x value and use this value in the formula.

19.4.2. Serial Port Timing - Shift Register Mode

Table 27. Symbol Description (F= 40 MHz)

Symbol Parameter

XLXL

Serial port clock cycle time

QVHX

Output data set-up to clock rising edge

XHQX

Output data hold after clock rising edge

XHDX

Input data hold after clock rising edge

XHDV

Clock rising edge to input data valid

Table 28. AC Parameters for a Fix Clock (F= 40 MHz)

Symbol

Min Max

Units

XLXL

300 ns

QVHX

200 ns

XHQX

30 ns

XHDX

0 ns

XHDV

117 ns

1 2 ... 128 129 130 131 132 133 134 135 136 137

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Rainbow-electronics T89C51CC02 Manual de usuario Pagina 133

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