SAB80C517 Datasheet, PDF (51/61 Pages) Siemens Semiconductor Group – 8-Bit CMOS Single-Chip Microcontroller

SAB 80C517/80C537
AC Characteristics (cont’d)
Parameter
Symbol
Limit Values
Unit
12 MHz Clock
Variable Clock
1/t _CLCL = 3.5 MHz to 12 MHz
min max.
min.
max.
External Data Memory Characteristics
RD pulse width
t_RLRH
400 –
6 t_CLCL – 100 –
ns
WR pulse width
t_WLWH 400 –
6 t_CLCL – 100 –
ns
Address hold after ALE t_LLAX2 132 –
2 t_CLCL – 30 –
ns
RD to valid instr in
t_RLDV
–
252 –
5 t_CLCL – 165 ns
Data hold after RD
t_RHDX
0
–
0
–
ns
Data float after RD
t_RHDZ
–
97
–
2 t_CLCL – 70 ns
ALE to valid data in
t_LLDV
–
517 –
8 t_CLCL – 150 ns
Address to valid data in t_AVDV
–
585 –
9 t_CLCL – 165 ns
ALE to WR or RD
t_LLWL
200 300 3 t_CLCL – 50 3 t_CLCL + 50 ns
WR or RD high to ALE t_WHLH 43
123 t_CLCL – 40
t_CLCL +40
ns
high
Address valid to WR
t_AVWL
203 –
4 t_CLCL – 130 –
ns
Data valid to WR
t_QVWX
33
–
t_CLCL – 50
–
ns
transition
Data setup before WR t_QVWX 433 –
7 t_CLCL – 150 –
ns
Data hold after WR
t_WHQX 33
–
t_CLCL – 50
–
ns
Address float after RD t_RLAZ
–
0
–
0
ns
Semiconductor Group
50