Table 56: Electrical Characteristics and AC Operating Conditions (Continued)
Notes 1–8 apply to the entire table
DDR3-800
Min Max
DDR3-1066
Min Max
DDR3-1333
Min Max
DDR3-1600
Parameter
Symbol
tRTP
tCCD
Min
Max
Unit Notes
READ-to-PRECHARGE time
CAS#-to-CAS# command delay
MIN = greater of 4CK or 7.5ns; MAX = n/a
CK
CK
CK
31, 32
MIN = 4CK; MAX = n/a
MIN = WR + tRP/tCK (AVG); MAX = n/a
Auto precharge write recovery + precharge
time
tDAL
MODE REGISTER SET command cycle time
MODE REGISTER SET command update delay
tMRD
tMOD
tMPRR
MIN = 4CK; MAX = n/a
CK
CK
CK
MIN = greater of 12CK or 15ns; MAX = n/a
MIN = 1CK; MAX = n/a
MULTIPURPOSE REGISTER READ burst end to
mode register set for multipurpose register
exit
Calibration Timing
ZQCL command: Long POWER-UP and RE-
tZQinit
512
–
512
–
512
–
512
–
CK
calibration time
SET operation
Normal operation
tZQoper
tZQCS
256
64
–
–
256
64
–
–
256
64
–
–
256
64
–
–
CK
CK
ZQCS command: Short calibration time
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
Refresh Timing
REFRESH-to-ACTIVATE or REFRESH
command period
tRFC – 1Gb
tRFC – 2Gb
tRFC – 4Gb
tRFC – 8Gb
–
MIN = 110; MAX = 70,200
MIN = 160; MAX = 70,200
MIN = 260; MAX = 70,200
MIN = 350; MAX = 70,200
64 (1X)
ns
ns
ns
ns
ms
ms
μs
μs
Maximum refresh
period
TC ≤ 85°C
TC > 85°C
TC ≤ 85°C
TC > 85°C
36
36
36
36
32 (2X)
Maximum average
periodic refresh
tREFI
7.8 (64ms/8192)
3.9 (32ms/8192)
Self Refresh Timing
MICRON [ MICRON TECHNOLOGY ]
