Rainbow-electronics T89C5115 Bedienungsanleitung PDF herunterladen (Seite 95)

T89C5115

4128A–8051–04/02

AC Parameters

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.

Example: T

AVLL

= Time for Address Valid to ALE Low.

LLPL

= Time for ALE Low to PSEN Low.

A =-40°Cto+85°C; V

=0V; V

=5V± 10%;F=0to40MHz.

A =-40°Cto+85°C; V

=0V; V

=5V± 10%.

( Load Capacitance for all outputs = 60 pF.)

Table 70 and Table 74 give the description of each AC symbols.

Table 71, Table 72 and Table 73 give for each range the AC parameter.

Table 72 gives 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.

Example: T

LLIV

and 20 MHz, Standard clock.

x = 30 ns

T = 50 ns

CCIV

= 4T - x = 170 ns

Serial Port Timing – Shift

Table 70. Symbol Description (F = 40 MHz)

Table 71. AC Parameters for a Fix Clock (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

Symbol Min Max Units

XLXL

300 ns

QVHX

200 ns

XHQX

30 ns

XHDX

0ns

XHDV

117 ns

1 2 ... 90 91 92 93 94 95 96 97 98 99 100 ... 104 105

T89C5115 1
4128A–8051–04/02 /xM 105

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