Timing Parameters & Specifications
(These AC characteristics were tested on the Component)
Parameter Symbol Min Max Unit Note
DQ output access time from CK & /CK
tAC
-450 +450 ps
DQS output access time from CK & /CK tDQSCK -400 +400 ps
CK high-level width
tCH 0.48 0.52 tCK
CK low-level width tCL 0.48 0.52 tCK
CK half period
tHP min(tCL,tCH) X
ps
Clock cycle time, CL=x
tCK 3000 8000 ps
DQ and DM input hold time
tDH 175 x
ps
DQ and DM input setup time
tDS 100 X ps
Control & Address input pulse width for each input
tIPW 0.6 x tCK
DQ and DM input pulse width for each input
tDIPW 0.35 X tCK
Data-out high-impedance time from CK/CK
tHZ X
tAC max
ps
DQS low-impedance time from CK/CK
tLZ(DQS) tAC min tAC max ps
DQ low-impedance time from CK/CK
tLZ(DQ) 2* tACmin tACmax
ps
DQS-DQ skew for DQS and associated DQ signals
tDQSQ X 240 ps
DQ hold skew factor
tQHS X 340
ps
DQ/DQS output hold time from DQS
tQH tHP - tQHS X ps
Write command to first DQS latching transition
tDQSS -0.25 0.25 tCK
DQS input high pulse width
tDQSH 0.35 X tCK
DQS input low pulse width
tDQSL 0.35 X tCK
DQS falling edge to CK setup time
tDSS
0.2 X
tCK
DQS falling edge hold time from CK
tDSH 0.2 X tCK
Mode register set command cycle time
tMRD 2 X tCK
Write postamble
tWPST 0.4 0.6 tCK
Write preamble
tWPRE 0.35 X tCK
Address and control input hold time
tIH 275 X
ps
Address and control input setup time
tIS 200 X ps
Read preamble
tRPRE 0.9 1.1 tCK
Read postamble
tRPST 0.4 0.6 tCK
Active to active command period for 1KB page size
products
tRRD 7.5 X ns
Active to active command period for 2KB page size
products
tRRD 10 X ns
Four Activate Window for 1KB page size products
tFAW 37.5 ns
Four Activate Window for 2KB page size products
tFAW 50 ns
/CAS to /CAS command delay
tCCD
2 tCK
Write recovery time tWR
15 X
ns
