Rainbow Electronics T89C51CC01 - Manual (Page 136)

136
T89C51CC01
Rev. D – 17-Dec-01
Figure 61. Clock Signal Waveform for I
CC
Tests in Active and Idle Modes
19.3 DC Parameters for A/D Converter
Table 94. DC Parameters for AD Converter in Precision conversion
Notes: 1. Typicals are based on a limited number of samples and are not guaranteed.
19.4 AC Parameters
19.4.1 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.
T
LLPL
= Time for ALE Low to PSEN Low.
T A = -40
°
C to +85
°
C; V
SS
= 0 V; V
CC
= 5 V
±
10%; F = 0 to 40 MHz.
T
A
= -40 ° C to +85 ° C; V
SS
= 0 V; V
CC
= 5 V ± 10%.
(Load Capacitance for port 0, ALE and PSEN = 60 pF; Load Capacitance for all other
outputs = 60 pF.)
Table 95, Table 98 and Table 101 give the description of each AC symbols.
Table 96, Table 100 and Table 102 give for each range the AC parameter.
Table 97, Table 100 and Table 103 give 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
T
CCIV
= 4T - x = 170 ns
V
CC
-0.5V
0.45V
0.7V
CC
0.2V
CC
-0.1
T
CLCH
T
CHCL
T
CLCH
= T
CHCL
= 5ns.
Symbol Parameter Min Typ (1) Max Unit Test Conditions
AVin Analog input voltage Vss- 0.2 Vref + 0.2 V
Rref Resistance between Vref and Vss 12 16 24
KO
hm
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