Rainbow Electronics AT89C5131 - Manual (Page 157)

157
AT89C5131
4136A–USB–03/03
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
= 5V ± 10%; F = 0 to 40 MHz.
T
A
= -40
°
C to +85
°
C; V
SS
= 0V; V
CC
= 5V
±
10%.
(Load Capacitance for port 0, ALE and PSEN = 60 pF; Load Capacitance for all other
outputs = 60 pF.)
Table 104, Table 107 and Table 110 give the description of each AC symbols.
Table 105, Table 109 and Table 111 give for each range the AC parameter.
Table 106, Table 109 and Table 112 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
External Program Memory
Characteristics Table 104. Symbol Description
Symbol Parameter
T Oscillator Clock Period
T
LHLL
ALE Pulse Width
T
AVLL
Address Valid to ALE
T
LLAX
Address Hold after ALE
T
LLIV
ALE to Valid Instruction In
T
LLPL
ALE to PSEN
T
PLPH
PSEN Pulse Width
T
PLIV
PSEN to Valid Instruction In
T
PXIX
Input Instruction Hold after PSEN
T
PXIZ
Input Instruction Float after PSEN
T
AVIV
Address to Valid Instruction In
T
PLAZ
PSEN Low to Address Float