![](http://datasheet.mmic.net.cn/200000/MT41J128M16HA-107-D_datasheet_15084792/MT41J128M16HA-107-D_90.png)
Table 57: Electrical Characteristics and AC Operating Conditions for Speed Extensions (Continued)
Notes 1–8 apply to the entire table
Parameter
Symbol
DDR3-1866
Units
Notes
Min
Max
ACTIVATE-to-PRECHARGE command period
tRAS
ns
ACTIVATE-to-ACTIVATE command period
tRC
ns
ACTIVATE-to-ACTIVATE minimum com-
mand
period
1KB page size
tRRD
MIN = greater of 4CK or 5ns
CK
2KB page size
MIN = greater of 4CK or 6ns
CK
Four ACTIVATE
windows
1KB page size
tFAW
25
–
ns
2KB page size
35
–
ns
Write recovery time
tWR
MIN = 15ns; MAX = n/a
ns
Delay from start of internal WRITE
transaction to internal READ command
tWTR
MIN = greater of 4CK or
7.5ns; MAX = n/a
CK
READ-to-PRECHARGE time
tRTP
MIN = greater of 4CK or
7.5ns; MAX = n/a
CK
CAS#-to-CAS# command delay
tCCD
MIN = 4CK; MAX = n/a
CK
Auto precharge write recovery + precharge time
tDAL
MIN = WR + tRP/tCK (AVG);
MAX = n/a
CK
MODE REGISTER SET command cycle time
tMRD
MIN = 4CK; MAX = n/a
CK
MODE REGISTER SET command update delay
tMOD
MIN = greater of 12CK or
15ns; MAX = n/a
CK
MULTIPURPOSE REGISTER READ burst end to mode register set for multi-
purpose register exit
tMPRR
MIN = 1CK; MAX = n/a
CK
Calibration Timing
ZQCL command: Long calibration time POWER-UP and RESET operation
tZQinit
MIN = n/a
MAX = max(512nCK, 640ns)
CK
Normal operation
tZQoper
MIN = n/a
MAX = max(256nCK, 320ns)
CK
ZQCS command: Short calibration time
tZQcs
MIN = n/a
MAX = max(64nCK, 80ns)
CK
Initialization and Reset Timing
Exit reset from CKE HIGH to a valid command
tXPR
MIN = greater of 5CK or
tRFC + 10ns; MAX = n/a
CK
2Gb:
x4,
x8,
x16
DDR3
SDRAM
Electrical
Characteristics
and
AC
Operating
Conditions
PDF:
09005aef826aaadc
2Gb_DDR3_SDRAM.pdf
–
Rev.
K
04/10
EN
90
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Technology,
Inc.
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2006
Micron
Technology,
Inc.
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