Hitachi H8/3048 Hardware Manual page 675

Table 21-5 Refresh Controller Bus Timing
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Condition A: V
CC
V
SS
specifications), T
Condition B: 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* t
RAS precharge time*
CAS to RAS precharge t
time*
CAS pulse width
RAS access time*
Address access time
CAS access time*
Write data setup time 3 t
CAS setup time*
Read strobe delay time t
Note is on next page.
= 2.7 V to 5.5 V, AV = 2.7 V to 5.5 V, V
CC
= AV = 0 V, ø = 1 MHz to 8 MHz, T
SS
= –40°C to +85°C (wide-range specifications)
a
= 3.15 V to 5.5 V, AV
CC
= AV = 0 V, ø = 1 MHz to 13 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 18 MHz, T
SS
= –40°C to +85°C (wide-range specifications)
a
Condition A Condition B
8 MHz
Symbol Min Max Min
t — 60 —
RAD1
t — 60 —
RAD2
t — 60 —
RAD3
25 — 20
RAH
t 85 — 55
RP
85 — 55
CRP
t 100 — 55
CAS
t — 160 —
RAC
t — 105 —
AA
t — 50 —
CAC
50 — 20
WDS3
t 20 — 10
CSR
— 60 —
RSD
= 2.7 V to AV
REF
= –20°C to +75°C (regular
a
= 3.15 V to 5.5 V, V
REF
= –20°C to +75°C (regular
a
= 4.5 V to AV
REF
= –20°C to +75°C (regular
a
Condition C
13 MHz 16 MHz
Max Min Max Min
50 — 30 —
50 — 30 —
50 — 30 —
— 15 — 15
— 45 — 40
— 45 — 40
— 40 — 35
80 — 85 —
45 — 55 —
30 — 30 —
— 15 — 10
— 15 — 10
50 — 30 —
667
,
CC
= 3.15 V to AV ,
CC
,
CC
18 MHz
Test
Max Unit
Conditions
30 ns
Figure 21-10
to
30
Figure 21-16
30
—
—
—
—
70
45
25
—
—
30