Table 57: Electrical Characteristics and AC Operating Conditions for Speed Extensions (Continued)
Notes 1–8 apply to the entire table
DDR3-1866
DDR3-2133
Parameter
Symbol
tRC
tRRD
Min
Max
Min
Max
Unit Notes
ACTIVATE-to-ACTIVATE command period
See Speed Bin Tables (page 74) for tRC
ns
CK
CK
31, 43
31
ACTIVATE-to-ACTIVATE 1KB page size
minimum command pe-
riod
MIN = greater of 4CK or 5ns
2KB page size
MIN = greater of 4CK or 6ns
31
Four ACTIVATE
windows
1KB page size
2KB page size
tFAW
27
35
–
–
25
35
–
–
ns
ns
ns
31
31
Write recovery time
tWR
MIN = 15ns; MAX = n/a
31, 32,
33
Delay from start of internal WRITE transac-
tion to internal READ command
tWTR
MIN = greater of 4CK or 7.5ns; MAX = n/a
CK
31, 34
READ-to-PRECHARGE time
tRTP
tCCD
tDAL
MIN = greater of 4CK or 7.5ns; MAX = n/a
MIN = 4CK; MAX = n/a
MIN = WR + tRP/tCK (AVG); MAX = n/a
CK
CK
CK
31, 32
CAS#-to-CAS# command delay
Auto precharge write recovery + precharge
time
MODE REGISTER SET command cycle time
MODE REGISTER SET command update delay
tMRD
tMOD
tMPRR
MIN = 4CK; MAX = n/a
MIN = greater of 12CK or 15ns; MAX = n/a
MIN = 1CK; MAX = n/a
CK
CK
CK
MULTIPURPOSE REGISTER READ burst end to
mode register set for multipurpose register
exit
Calibration Timing
ZQCL command: Long POWER-UP and RE-
tZQinit
MIN = n/a
MAX = max(512nCK, 640ns)
CK
CK
CK
calibration time
SET operation
Normal operation
tZQoper
MIN = n/a
MAX = max(256nCK, 320ns)
ZQCS command: Short calibration time
MIN = n/a
MAX = max(64nCK, 80ns) tZQCS
Initialization and Reset Timing
Exit reset from CKE HIGH to a valid command
tXPR
tVDDPR
MIN = greater of 5CK or tRFC + 10ns; MAX = n/a
CK
ms
Begin power supply ramp to power supplies
stable
MIN = n/a; MAX = 200
RESET# LOW to power supplies stable
RESET# LOW to I/O and RTT High-Z
tRPS
tIOZ
MIN = 0; MAX = 200
MIN = n/a; MAX = 20
ms
ns
35
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