Datasheet

171
AT89C51CC03
4182O–CAN–09/08
Figure 81. Clock Signal Waveform for I
CC
Tests in Active and Idle Modes
DC Parameters for A/D
Converter
Table 117. DC Parameters for AD Converter in Precision Conversion
Note: 1. Typicals are based on a limited number of samples and are not guaranteed.
2. For temperatures higher than 85°C, use standard conversion (8-bit only) and
PRS >
2.
3. V
REF
< V
CC
+ 0.2V for temperatures higher than 85.
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: 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
= 0V; V
CC
= 3V to 5.5V; F = 0 to 40 MHz.
(Load Capacitance for port 0, ALE and PSEN = 60 pF; Load Capacitance for all other
outputs = 60 pF.)
Table 118, Table 121 and Table 124 give the description of each AC symbols.
Table 119, Table 123 and Table 125 give for each range the AC parameter.
Table 120, Table 123 and Table 126 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),(2)
Max Unit Test Conditions
AVin Analog input voltage Vss- 0.2
Vref + 0.2 V
Rref Resistance between Vref and Vss 12 16 24 kΩ
Vref
(3)
Reference voltage 2.40 3.00 V
Cai Analog input Capacitance 60 pF During sampling
Rai Analog input Resistor 400 Ω During sampling
INL Integral non linearity 1
2
lsb
3 Automotive
DNL Differential non linearity 0.5 1 lsb
OE Offset error -2 2 lsb