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MT47H128M16RT-25EC Datasheet, PDF (37/134 Pages) Micron Technology – DDR2 SDRAM MT47H512M4 – 64 Meg x 4 x 8 banks MT47H256M8 – 32 Meg x 8 x 8 banks MT47H128M16 – 16 Meg x 16 x 8 banks | |||
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Table 12: AC Operating Specifications and Conditions (Continued)
Not all speed grades listed may be supported for this device; refer to the title page for speeds supported; Notes: 1â5 apply to the entire table;
VDDQ = 1.8V ±0.1V, VDD = 1.8V ±0.1V
AC Characteristics
-187E
-25E
-25
-3E
-3
-37E
-5E
Parameter
Symbol Min Max Min Max Min Max Min Max Min Max Min Max Min Max Units Notes
Internal READ-to-
tRTP
7.5
â
7.5 â 7.5 â 7.5 â 7.5 â 7.5 â 7.5 â ns 18, 37,
PRECHARGE delay
39
CAS#-to-CAS#
delay
tCCD
2
â
2
â
2
â
2
â
2
â
2
â
2
â tCK 18
Write recovery
time
tWR
15
â
15 â 15 â 15 â 15 â 15 â 15 â ns 18, 37
Write AP recovery tDAL tWR + â tWR + â tWR + â tWR + â tWR + â tWR + â tWR + â
ns
40
+ precharge time
tRP
tRP
tRP
tRP
tRP
tRP
tRP
Internal WRITE-to- tWTR 7.5
â
7.5 â 7.5 â 7.5 â 7.5 â 7.5 â 10 â ns 18, 37
READ delay
LOAD MODE cycle tMRD
2
â
2
â
2
â
2
â
2
â
2
â
2
â tCK 18
time
REFRESH- 256Mb tRFC
75
â
75 â 75 â 75 â 75 â 75 â 75 â
to-
ACTIVATE
or to
-REFRESH
512Mb
1Gb
2Gb
105 â 105 â 105 â 105 â 105 â 105 â 105 â
127.5 â 127.5 â 127.5 â 127.5 â 127.5 â 127.5 â 127.5 â
195 â 195 â 195 â 195 â 195 â 195 â 195 â
interval
ns 18, 41
Average periodic
tREFI
â
7.8
â 7.8 â 7.8 â 7.8 â 7.8 â 7.8 â 7.8 μs 18, 41
refresh
(commercial)
Average periodic
tREFIIT
â
3.9
â 3.9 â 3.9 â 3.9 â 3.9 â 3.9 â 3.9 μs 18, 41
refresh
(industrial)
Average periodic
tREFIAT
â
3.9
â 3.9 â 3.9 â 3.9 â 3.9 â 3.9 â 3.9 μs 18, 41
refresh
(automotive)
CKE LOW to CK,
CK# uncertainty
tDELAY
MIN limit = tIS + tCK + tIH
MAX limit = n/a
ns
42
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