AT89C5131A-RDTUM datasheet(164/188 Pages) ATMEL

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164

4337K–USB–04/08

AT89C5130A/31A-M

27.4

AC Parameters

27.4.1

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 sta-

tus 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°C to +85°C; VSS = 0V; VCC = 3.3V ±10%; F = 0 to 48 MHz.

TA = -40°C to +85°C; VSS = 0V; VCC = 3.3V ± 10%.

(Load Capacitance for port 0, ALE and PSEN = 60 pF; Load Capacitance for all other outputs =

60 pF.)

Table 27-2, Table 27-5 and Table 27-8 give the description of each AC symbols.

Table 27-3, Table 27-7 and Table 27-9 give for each range the AC parameter.

Table 27-4, Table 27-7 and Table 27-10 give the frequency derating formula of the AC parame-

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

this value in the formula.

Example: TLLIV and 20 MHz, Standard clock.

x = 30 ns

T = 50 ns

TCCIV = 4T - x = 170 ns

Symbol

Parameter

Min

Typ

Max

Unit

VREF

USB Reference Voltage

3.0

3.6

VIH

Input High Voltage for D+ and D- (Driven)

2.0

4.0

VIHZ

Input High Voltage for D+ and D- (Floating)

2.7

3.6

VIL

Input Low Voltage for D+ and D-

0.8

VOH

Output High Voltage for D+ and D-

2.8

3.6

VOL

Output Low Voltage for D+ and D-

0.0

0.3

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