Siemens SAB 80515 Series, Руководство пользователя, Страница: 261 / 270

Device Specifications
Semiconductor Group 261
AC Characteristics for SAB 80C515-20 / 80C535-20
V
CC
= 5 V
±
10 %;
V
SS
= 0 V
T
A
= 0 °C to + 70 °C
(
C
L
for port 0, ALE and PSEN outputs = 100 pF;
C
L
for all other outputs = 80 pF)
*
)
Interfacing the SAB 80C515 / 80C535 microcontrollers to devices with float times up to 45 ns is permissible.
This limited bus contention will not cause any damage to port 0 drivers.
Parameter Symbol Limit values Unit
20 MHz
clock
Variable clock
1/
t
CLCL
= 3.5 MHz to 20 MHz
min. max. min. max.
Program Memory Characteristics
ALE pulse width
t
LHLL
60 – 2
t
CLCL
– 40 – ns
Address setup to ALE
t
AVLL
20 –
t
CLCL
– 30 – ns
Address hold after ALE
t
LLAX
20 –
t
CLCL
– 30 – ns
ALE low to valid instr in
t
LLIV
– 100 – 4
t
CLCL
– 100 ns
ALE to PSEN
t
LLPL
25 –
t
CLCL
– 25 – ns
PSEN pulse width
t
PLPH
115 – 3
t
CLCL
– 35 – ns
PSEN to valid instr in
t
PLIV
– 75 – 3
t
CLCL
– 75 ns
Input instruction hold
after PSEN
t
PXIX
0 – 0 – ns
Input instruction float
after PSEN
t
PXIZ
*
)
– 40 –
t
CLCL
– 10 ns
Address valid after PSEN
t
PXAV
*
)
47 –
t
CLCL
– 3 – ns
Address to valid instr in
t
AVIV
– 190 – 5
t
CLCL
– 60 ns
Address float to PSEN
t
AZPL
0 – 0 – ns
*