C541U Datasheet, PDF (48/63 Pages) Siemens Semiconductor Group – 8 BIT CMOS MICROCONTROLLER

C541U
AC Characteristics (cont’d)
External Data Memory Characteristics
Parameter
RD pulse width
WR pulse width
Address hold after ALE
RD to valid data in
Data hold after RD
Data float after RD
ALE to valid data in
Address to valid data in
ALE to WR or RD
Address valid to WR
WR or RD high to ALE high
Data valid to WR transition
Data setup before WR
Data hold after WR
Address float after RD
Symbol
10-MHz
clock
Duty Cycle
0.4 to 0.6
min. max.
t_RLRH
t_WLWH
t_LLAX2
t_RLDV
180 –
180 –
56 –
–
110
t_RHDX
0
t_RHDZ
–
t_LLDV
–
t_AVDV
–
63
200
211
t_LLWL
66
166
t_AVWL
t_WHLH
t_QVWX
t_QVWH
70 –
8
58
8
–
163 –
t_WHQX
8
–
t_RLAZ
–
0
Limit Values
Variable Clock
1/CLP= 2 MHz to 12 MHz
min.
max.
3 CLP - 70 –
3 CLP - 70 –
CLP - 27
–
–
2 CLP+
TCL_Hmin - 90
0
–
–
CLP - 20
–
4 CLP - 133
–
CLP +
TCL_Lmin - 50
2 CLP - 97
4 CLP +
TCL_Hmin -155
CLP+
TCL_Lmin+ 50
–
TCL_Hmin - 25 TCL_Hmin + 25
TCL_Lmin - 25 –
3 CLP +
–
TCL_Lmin - 120
TCL_Hmin - 25 –
–
0
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Semiconductor Group
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