T89C51RD2-3CSCM データシートの表示（PDF） - Atmel Corporation

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T89C51RD2-3CSCM

0 to 40MHz Flash Programmable 8-bit Microcontroller

Atmel Corporation 

AC Parameters

Explanation of the AC

Symbols

4243G–8051–05/03

T89C51RD2

Figure 35. ICC Test Condition, Power-Down Mode

VCC-0.5V

0.45V

0.7VCC

0.2VCC-0.1

TCHCL

TCLCH

TCLCH = TCHCL = 5ns.

Figure 36. Clock Signal Waveform for ICC Tests in Active and Idle Modes

VCC

ICC

VCC

VCC

P0

RST EA

(NC)

XTAL2

XTAL1

VSS

All other pins are disconnected.

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 = 0 to +70°C; VSS = 0 V; VCC = 5 V ± 10%; M range.

TA = -40°C to +85°C; VSS = 0 V; VCC = 5 V ± 10%; M range.

TA = 0 to +70°C; VSS = 0 V; 2.7 V < VCC < 3.3 V; L range.

TA = -40°C to +85°C; VSS = 0 V; 2.7 V < VCC < 3.3 V; L range.

AC characteristics of -M parts at 3 volts are similar to -L parts

(Load Capacitance for port 0, ALE and PSEN = 100 pF; Load Capacitance for all other

outputs = 80 pF.)

Table 44, Table 48 and Table 50 give the description of each AC symbols.

Table 46, Table 49 and Table 51 give for each range the AC parameter.

Table 47, Table 50 and Table 52 give the frequency derating formula of the AC parame-

ter for each speed range description. To calculate each AC symbols. take the x value in

the correponding column (-M or -L) and use this value in the formula.

Example: TLLIU for -M and 20 MHz, Standard clock.

x = 35 ns

T = 50 ns

TCCIV = 4T - x = 165 ns

85

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