W9412G6CH
Publication Release Date: Jul. 04, 2007
- 27 - Revision A06
9.6 AC Characteristics and Operating Condition
-45 -5
SYM. PARAMETER
MIN. MAX. MIN. MAX.
UNIT NOTES
tRC Active to Ref/Active Command Period 54 50
tRFC Ref to Ref/Active Command Period 63 70
tRAS Active to Precharge Command Period 36 70000 40 100000
tRCD Active to Read/Write Command Delay Time 18 15
tRAP Active to Read with Auto-precharge Enable 18 15
nS
tCCD Read/Write(a) to Read/Write(b) Command Period 1 1 tCK
tRP Precharge to Active Command Period 18 15
tRRD Active(a) to Active(b) Command Period 12 10
tWR Write Recovery Time 15 15
tDAL Auto-precharge Write Recovery + Precharge Time 30 35
CL = 2 - - 7.5 12
CL = 2.5 - - 6 12
tCK CLK Cycle Time
CL = 3 4.5 12 5 12
tAC
Data Access Time from CLK,
CLK
-0.7 0.7 -0.7 0.7
tDQSCK
DQS Output Access Time from CLK,
CLK
-0.6 0.6 -0.6 0.6
16
tDQSQ Data Strobe Edge to Output Data Edge Skew 0.45 0.4
nS
tCH CLk High Level Width 0.45 0.55 0.45 0.55
tCL CLK Low Level Width 0.45 0.55 0.45 0.55
tCK 11
tHP CLK Half Period (minimum of actual Tch, Tcl)
min
(tCL,tCH)
min,
(tCL,tCH)
tQH DQ Output Data Hold Time from DQS tHP-0.55 tHP-0.5
nS
tRPRE DQS Read Preamble Time 0.9 1.1 0.9 1.1
tRPST DQS Read Postamble Time 0.4 0.6 0.4 0.6
tCK 11
tDS DQ and DM Setup Time 0.4 0.4
tDH DQ and DM Hold Time 0.4 0.4
tDIPW DQ and DM Input Pulse Width (for each input) 1.75 1.75
nS
tDQSH DQS Input High Pulse Width 0.35 0.35
tDQSL DQS Input Low Pulse Width 0.35 0.35
tDSS DQS Falling Edge to CLK Setup Time 0.2 0.2
tDSH DQS Falling Edge Hold Time from CLK 0.2 0.2
tCK 11
tWPRES Clock to DQS Write Preamble Set-up Time 0 0 nS
tWPRE DQS Write Preamble Time 0.25 0.3
tWPST DQS Write Postamble Time 0.4 0.6 0.4 0.6
tDQSS Write Command to First DQS Latching Transition 0.85 1.15 0.75 1.25
11
tDSSK UDQS – LDQS Skew (x 16) -0.25 0.25 -0.25 0.25
tCK
