Rainbow-electronics T89C51AC2 Bedienungsanleitung PDF herunterladen (Seite 97)

T89C51AC2

Rev. B – 19-Dec-01

Figure 44. Clock Signal Waveform for I

Tests in Active and Idle Modes

18.3 DC Parameters for A/D Converter

Table 58. DC Parameters for AD Converter in Precision conversion

Notes: 1. Typicals are based on a limited number of samples and are not guaranteed.

18.4 AC Parameters

18.4.1 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.

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 = 0 to 40 MHz.

A =-40°Cto+85°C; V

=0V;V

=5V± 10%.

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

outputs = 60 pF.)

Table 59, Table 62 and Table 65 give the description of each AC symbols.

Table 60, Table 63 and Table 66 give for each range the AC parameter.

Table 61, Table 64 and Table 67 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: T

LLIV

and 20 MHz, Standard clock.

x = 30 ns

T = 50 ns

CCIV

= 4T - x = 170 ns

-0.5V

0.45V

0.7V

0.2V

-0.1

CLCH

CHCL

CLCH

CHCL

=5ns.

Symbol Parameter Min Typ

(1)

Max Unit Test Conditions

AVin Analog input voltage Vss- 0.2

Vref +

0.2

Rref Resistance between Vref and Vss 12 16 24

Vref Reference voltage 2.40 3.00 V

Cai Analog input Capacitance 60 pF During sampling

INL Integral non linearity 1 2 lsb

DNL Differential non linearity 0.5 1 lsb

OE Offset error -2 2 lsb

1 2 ... 92 93 94 95 96 97 98 99 100 101 102 ... 109 110

T89C51AC2 1

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