Datasheet

C164CI/SI
C164CL/SL
Data Sheet 65 V2.0, 2001-05
AC Characteristics
Demultiplexed Bus
(Operating Conditions apply)
ALE cycle time = 4 TCL + 2
t
A
+ t
C
+ t
F
(80 ns at 25 MHz CPU clock without waitstates)
Parameter Symbol Max. CPU Clock
= 25 MHz
Variable CPU Clock
1 / 2TCL = 1 to 25 MHz
Unit
min. max. min. max.
ALE high time
t
5
CC 10 + t
A
– TCL - 10
+
t
A
– ns
Address setup to ALE
t
6
CC 4 + t
A
– TCL - 16
+
t
A
– ns
ALE falling edge to RD
,
WR
(with RW-delay)
t
8
CC 10 + t
A
– TCL - 10
+
t
A
– ns
ALE falling edge to RD
,
WR (no RW-delay)
t
9
CC -10 + t
A
– -10
+ t
A
– ns
RD
, WR low time
(with RW-delay)
t
12
CC 30 + t
C
– 2TCL - 10
+
t
C
– ns
RD
, WR low time
(no RW-delay)
t
13
CC 50 + t
C
– 3TCL - 10
+
t
C
– ns
RD
to valid data in
(with RW-delay)
t
14
SR – 20 + t
C
– 2TCL - 20
+
t
C
ns
RD
to valid data in
(no RW-delay)
t
15
SR – 40 + t
C
– 3TCL - 20
+
t
C
ns
ALE low to valid data in
t
16
SR – 40 +
t
A
+ t
C
– 3TCL - 20
+
t
A
+ t
C
ns
Address to valid data in
t
17
SR – 50 +
2
t
A
+ t
C
– 4TCL - 30
+
2t
A
+ t
C
ns
Data hold after RD
rising edge
t
18
SR 0 – 0 – ns
Data float after RD
rising
edge (with RW-delay
1)
)
t
20
SR – 26 +
2t
A
+ t
F
1)
– 2TCL - 14
+ 22t
A
+ t
F
1)
ns
Data float after RD
rising
edge (no RW-delay
1)
)
t
21
SR – 10 +
2
t
A
+ t
F
1)
– TCL - 10
+
22t
A
+ t
F
1)
ns