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Table 21-13 Refresh Controller Bus Timing
www.DataSheet4U.com
Condition A: V
CC
V
SS
specifications), T
Condition C: V
CC
V
SS
specifications), T
Item
RAS delay time 1
RAS delay time 2
RAS delay time 3
Row address hold time*
RAS precharge time*
CAS to RAS precharge time*
CAS pulse width
RAS access time*
Address access time
CAS access time*
Write data setup time 3
CAS setup time*
Read strobe delay time
Note: At 8 MHz, the times below depend as indicated on the clock cycle time.
= 0.5 × t
t
RAH
= 2.0 × t
t
RAC
t
= t
RP
CRP
At 16 MHz, the times below depend as indicated on the clock cycle time.
= 0.5 × t
t
RAH
= 2.0 × t
t
RAC
t
= t
RP
CRP
= 2.7 V to 5.5 V, AV
CC
= AV
= 0 V, ø = 1 MHz to 8 MHz, T
SS
= –40°C to +85°C (wide-range specifications)
a
= 5.0 V ± 10%, AV
= 5.0 V ± 10%, V
CC
= AV
= 0 V, ø = 1 MHz to 16 MHz, T
SS
= –40°C to +85°C (wide-range specifications)
a
Symbol
Min
t
—
RAD1
t
—
RAD2
t
—
RAD3
t
25
RAH
t
85
RP
t
85
CRP
t
100
CAS
t
—
RAC
t
—
AA
t
—
CAC
t
50
WDS3
t
20
CSR
t
—
RSD
– 38 (ns)
CYC
– 90 (ns)
CYC
= 1.0 × t
– 40 (ns)
CYC
– 17 (ns)
CYC
– 40 (ns)
CYC
= 1.0 × t
– 18 (ns)
CYC
= 2.7 V to 5.5 V, V
= 2.7 V to AV
REF
= –20°C to +75°C (regular
a
= 4.5 V to AV
REF
= –20°C to +75°C (regular
a
Condition A
Condition C
8 MHz
16 MHz
Max
Min
60
—
60
—
60
—
—
15
—
45
—
45
—
40
160
—
105
—
50
—
—
15
—
15
60
—
= 1.0 × t
t
– 75 (ns)
CAC
CYC
= 0.5 × t
t
– 43 (ns)
CSR
CYC
= 1.0 × t
t
– 33 (ns)
CAC
CYC
= 0.5 × t
t
– 17 (ns)
CSR
CYC
685
,
CC
,
CC
Test
Max
Unit
Conditions
30
ns
Figure 21-10
to
30
Figure 21-16
30
—
—
—
—
85
55
30
—
—
30
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