21.2.2 AC Characteristics
Bus timing parameters are listed in table 21-4. Refresh controller bus timing parameters are listed
in table 21-5. Control signal timing parameters are listed in table 21-6. Timing parameters of the
on-chip supporting modules are listed in table 21-7.
Table 21-4 Bus Timing (1)
Condition A: V
CC
= 2.7 V to 5.5 V, AV
CC
= 2.7 V to 5.5 V, V
REF
= 2.7 V to AV
CC
,
V
SS
= AV
SS
= 0 V, ø = 1 MHz to 8 MHz, T
a
= –20°C to +75°C (regular
specifications), T
a
= –40°C to +85°C (wide-range specifications)
Condition B: V
CC
= 3.15 V to 5.5 V, AV
CC
= 3.15 V to 5.5 V, V
REF
= 3.15 V to AV
CC
,
V
SS
= AV
SS
= 0 V, ø = 1 MHz to 13 MHz, T
a
= –20°C to +75°C (regular
specifications), T
a
= –40°C to +85°C (wide-range specifications)
Condition C: V
CC
= 5.0 V ± 10%, AV
CC
= 5.0 V ± 10%, V
REF
= 4.5 V to AV
CC
,
V
SS
= AV
SS
= 0 V, ø = 1 MHz to 18 MHz, T
a
= –20°C to +75°C (regular
specifications), T
a
= –40°C to +85°C (wide-range specifications)
Condition A Condition B
Condition C
8 MHz
13 MHz
16 MHz
18 MHz
Item
Symbol Min
Max
Min
Max
Min
Max
Min
Max
Unit
Clock cycle time
t
CYC
125
1000 76.9
1000 62.5
1000 55.5
1000 ns
Clock pulse low width
t
CL
40
—
20
—
20
—
17
—
Clock pulse high width
t
CH
40
—
20
—
20
—
17
—
Clock rise time
t
CR
—
20
—
15
—
10
—
10
Clock fall time
t
CF
—
20
—
15
—
10
—
10
Address delay time
t
AD
—
60
—
50
—
30
—
25
Address hold time
t
AH
25
—
20
—
10
—
10
—
Address strobe delay
t
ASD
—
60
—
50
—
30
—
25
time
Write strobe delay time
t
WSD
—
60
—
50
—
30
—
25
Strobe delay time
t
SD
—
60
—
50
—
30
—
25
Write data strobe pulse t
WSW1
*
85
—
40
—
35
—
32
—
width 1
Write data strobe pulse t
WSW2
*
150
—
90
—
65
—
62
—
width 2
Address setup time 1
t
AS1
20
—
15
—
10
—
10
—
Address setup time 2
t
AS2
80
—
45
—
40
—
38
—
Read data setup time
t
RDS
50
—
30
—
20
—
15
—
Read data hold time
t
RDH
0
—
0
—
0
—
0
—
Test
Conditions
Figure 21-7,
Figure 21-8
664
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