T89C5115-RATIM datasheet(95/105 Pages) ATMEL

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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: TAVLL = Time for Address Valid to ALE Low.

TLLPL = Time for ALE Low to PSEN Low.

TA =-40

°Cto+85°C; V

SS =0V;

VCC =5V ± 10%; F = 0to40MHz.

TA =-40

°Cto+85°C; V

SS =0V;

VCC =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

TXLXL

Serial port clock cycle time

TQVHX

Output data set-up to clock rising edge

TXHQX

Output data hold after clock rising edge

TXHDX

Input data hold after clock rising edge

TXHDV

Clock rising edge to input data valid

Symbol

Min

Max

Units

TXLXL

300

TQVHX

200

TXHQX

TXHDX

0ns

TXHDV

117

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