VRS51C1000
AC Characteristics
TABLE 48: AC CHARACTERISTICS
Fosc 16
Variable Fosc
Valid
Symbol
T LHLL
T AVLL
T LLAX
T LLIV
T LLPL
T PLPH
T PLIV
Parameter
ALE Pulse Width
Cycle
Unit
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
Min.
Type Max.
Min.
Type
Max.
RD/WRT 115
RD/WRT 43
RD/WRT 53
RD
2xT - 10
T - 20
T - 10
Address Valid to ALE Low
Address Hold after ALE Low
ALE Low to Valid Instruction In
ALE Low to #PSEN low
#PSEN Pulse Width
#PSEN Low to Valid Instruction In
Instruction Hold after #PSEN
Instruction Float after #PSEN
Address to Valid Instruction In
#PSEN Low to Address Float
#RD Pulse Width
240
177
4xT - 10
3xT -10
RD
RD
RD
RD
RD
RD
RD
RD
WRT
RD
RD
RD
RD
RD
RD/WRT 178
RD/WRT 230
WRT
WRT
WRT
RD
53
173
T - 10
3xT - 15
T PXIX
T PXIZ
0
0
87
292
10
T + 25
5xT - 20
10
T AVI V
T PLAZ
T RLRH
T WLWH
T RLDV
T RHDX
T RHDZ
T LLDV
T AVDV
T LLYL
T AVYL
T QVWH
T QVWX
T WHQX
T RLAZ
T YALH
T CHCL
T CLCX
T CLCH
T CHCX
365
365
6xT - 10
6xT - 10
#WR Pulse Width
#RD Low to Valid Data In
Data Hold after #RD
302
5xT - 10
0
0
Data Float after #RD
145
590
542
197
2xT + 20
8xT - 10
9xT - 20
3xT + 10
ALE Low to Valid Data In
Address to Valid Data In
ALE low to #WR High or #RD Low
Address Valid to #WR or #RD Low
Data Valid to #WR High
Data Valid to #WR Transition
Data Hold after #WR
#RD Low to Address Float
#W R or #RD High to ALE High
Clock Fall Time
3xT - 10
4xT - 20
7xT - 35
T - 25
403
38
73
T + 10
5
RD/WRT 53
72
T -10
T+10
Clock Low Time
Clock Rise Time
Clock High Time
T,TCLCL Clock Period
63
1/fosc
______________________________________________________________________________________________
www.ramtron.com page 38 of 48
RAMTRON [ RAMTRON INTERNATIONAL CORPORATION ]
