Datasheet
Rev. 0.3 / Dec. 2009 18
1200pin Unbuffered DDR2 SDRAM SO-DIMMs
Parameter
Symbol
DDR2-667 DDR2-800
Unit Note
min max min max
DQ output access time from CK/CK tAC -450 +450 -400 +400 ps
DQS output access time from CK/CK tDQSCK -400 +400 -350 +350 ps
CK high-level width tCH 0.45 0.55 0.48 0.52 tCK
CK low-level width tCL 0.45 0.55 0.48 0.52 tCK
CK half period tHP
min(tCL,
tCH)
-
min(tCL,
tCH)
- ps
Clock cycle time, CL=x tCK 3000 8000 2500 8000 ps
DQ and DM input setup time
(differential strobe)
tDS 100 - 50 - ps 1
DQ and DM input hold time
(differential strobe)
tDH 175 - 125 - ps 1
Control & Address input pulse width for each
input
tIPW 0.6 - 0.6 - tCK
DQ and DM input pulse width for each input tDIPW 0.35 - 0.35 - tCK
Data-out high-impedance time from CK/CK tHZ - tAC max tAC max ps
DQS low-impedance time from CK/CK tLZ(DQS) tAC min tAC max tAC min tAC max ps
DQ low-impedance time from CK/CK tLZ(DQ) 2*tAC min tAC max 2*tAC min tAC max ps
DQS-DQ skew for DQS and associated DQ
signals
tDQSQ - 240 - 240 ps
DQ hold skew factor tQHS - 340 - 300 ps
DQ/DQS output hold time from DQS tQH tHP - tQHS - tHP - tQHS - ps
First DQS latching transition to associated
clock edge
tDQSS -0.25 +0.25 -0.25 +0.25 tCK
DQS input high pulse width tDQSH 0.35 - 0.35 - tCK
DQS input low pulse width tDQSL 0.35 - 0.35 - tCK
DQS falling edge to CK setup time tDSS 0.2 - 0.2 - tCK
DQS falling edge hold time from CK tDSH 0.2 - 0.2 - tCK
Mode register set command cycle time tMRD 2 - 2 - tCK
Write preamble tWPRE 0.35 - 0.35 - tCK
Write postamble tWPST 0.4 0.6 0.4 0.6 tCK
Address and control input setup time tIS 200 - 175 - ps
Address and control input hold time tIH 275 - 250 - ps
Read preamble tRPRE 0.9 1.1 0.9 1.1 tCK
Read postamble tRPST 0.4 0.6 0.4 0.6 tCK
Activate to precharge command tRAS 45 70000 45 70000 ns
Row Active to Row Active Delay for 1KB
page size
tRRD 7.5 - 7.5 - ns
Row Active to Row Active Delay for 2KB
page size
tRRD 10 - 10 - ns
Four Active Window for 1KB page size
products
tFAW 37.5 - 35 - ns
Four Active Window for 2KB page size
products
tFAW 50 - 45 - ns