User`s manual

Semiconductor Group 10-7
Device Specifications
C501
10.5 AC Characteristics for C501-L24 / C501-1R24 / C501-1E24
V
CC
= 5 V + 10 %, – 15 %; V
SS
= 0 V T
A
= 0 °C to 70 °C for the SAB-C501
T
A
= – 40 °C to 85 °C for the SAF-C501
(
C
L
for port 0, ALE and PSEN outputs = 100 pF; C
L
for all other outputs = 80 pF)
Program Memory Characteristics
*) Interfacing the C501 to devices with float times up to 37 ns is permissible. This limited bus contention will not
cause any damage to port 0 Drivers.
Parameter Symbol Limit Values Unit
24 MHz
Clock
Variable Clock
1/
t
CLCL
= 3.5 MHz to 24 MHz
min. max. min. max.
ALE pulse width
t
LHLL
43 – 2t
CLCL
– 40 – ns
Address setup to ALE
t
AVLL
17 – t
CLCL
– 25 – ns
Address hold after ALE
t
LLAX
17 – t
CLCL
– 25 – ns
ALE low to valid instr in
t
LLIV
–80– 4t
CLCL
– 87 ns
ALE to PSEN
t
LLPL
22 – t
CLCL
– 20 – ns
PSEN
pulse width t
PLPH
95 – 3t
CLCL
– 30 – ns
PSEN
to valid instr in t
PLIV
–60– 3t
CLCL
– 65 ns
Input instruction hold after PSEN
t
PXIX
0–0–ns
Input instruction float after PSEN
t
PXIZ
*)
–32– t
CLCL
– 10 ns
Address valid after PSEN
t
PXAV
*)
37 – t
CLCL
– 5 – ns
Address to valid instr in
t
AVIV
– 148 – 5t
CLCL
– 60 ns
Address float to PSEN
t
AZPL
0–0–ns