HD6433044 Datasheet, PDF (675/867 Pages) Hitachi Semiconductor – Hitachi Single-Chip Microcomputer

Table 21-5 Refresh Controller Bus Timing
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
RAS delay time 1
t_RAD1 — 60 — 50 — 30 — 30
RAS delay time 2
t_RAD2 — 60 — 50 — 30 — 30
RAS delay time 3
t_RAD3 — 60 — 50 — 30 — 30
Row address hold time* t_RAH
25 — 20 — 15 — 15 —
RAS precharge time* t_RP
85 — 55 — 45 — 40 —
CAS to RAS precharge t_CRP
time*
85 — 55 — 45 — 40 —
CAS pulse width
t_CAS
100 — 55 — 40 — 35 —
RAS access time*
t_RAC
— 160 — 80 — 85 — 70
Address access time t_AA
— 105 — 45 — 55 — 45
CAS access time*
t_CAC
— 50 — 30 — 30 — 25
Write data setup time 3 t_WDS3 50 — 20 — 15 — 10 —
CAS setup time*
t_CSR
20 — 10 — 15 — 10 —
Read strobe delay time t_RSD
— 60 — 50 — 30 — 30
Note is on next page.
Test
Unit Conditions
ns Figure 21-10
to
Figure 21-16
667