元器件交易网

256MB, 512MB Registered DIMMs

Parameter

DQS input low pulse widthDQS falling edge to CK setup time

DQS falling edge hold time from CK

DDR2 SDRAM

DDR2-533min

0.350.20.220.40.353752500.90.47.51037.5502

Symbol

tDQSLtDSStDSHtMRDtWPSTtWPREtIHtIStRPREtRPST

DDR2-667min

0.350.20.220.40.352752000.90.47.51037.550215tWR+tRP

7.57.5tRFC + 10200226 - AL32tAC(min)tAC(min)+2

2.5tAC(min)tAC(min)+2

380tIS+tCK +tIH

122tAC(max)+0.72tCK+tAC(ma

x)+1

2.5tAC(max)+

0.62.5tCK+tAC(max)+1

xxxxx

DDR2-400min

0.350.20.220.40.354753500.90.47.51037.5502

xxx

15tWR+tRP

107.5tRFC + 10200

xx

226 - AL

xxxxx

UnitsNotes

xxxx0.6xxx1.10.6xx

tCKtCKtCKtCKtCKtCKpspstCKtCKnsnsnsnstCKnstCKnsnsnstCKtCKtCKtCKtCK

2

tCKnsnstCKnsnstCKtCK

12

nsns

max

xxxx0.6xxx1.10.6xx

max

xxxx0.6xxx1.10.6xx

max

Mode register set command cycle timeWrite postambleWrite preamble

Address and control input hold time

Address and control input setup timeRead preambleRead postamble

Active to active command period for 1KB page

tRRD

size products

Active to active command period for 2KB page

tRRD

size products

Four Activate Window for 1KB page size products

Four Activate Window for 2KB page size products

CAS to CAS command delayWrite recovery time

tFAWtFAWtCCDtWR

15tWR+tRP7.57.5tRFC + 10200226 - AL

Auto precharge write recovery + precharge timetDALInternal write to read command delayInternal read to precharge command delayExit self refresh to a non-read commandExit self refresh to a read commandExit precharge power down to any non-read command

Exit active power down to read commandExit active power down to read command(Slow exit, Lower power)CKE minimum pulse width(high and low pulse width)ODTturn-ondelayODT turn-on

ODT turn-on(Power-Down mode)ODT turn-off delayODT turn-off

ODT turn-off (Power-Down mode)ODT to power down entry latencyODT power down exit latencyOCD drive mode output delay

Minimum time clocks remains ON after CKE asynchronously drops LOW

tWTRtRTPtXSNRtXSRDtXPtXARDtXARDStCKEtAONDtAONtAONPDtAOFDtAOFtAOFPDtANPDtAXPDtOITtDelay

3

2tAC(min)tAC(min)+2

2.5

tAC(min)

3

2tAC(max)+12tCK+tAC(ma

x)+1

2.5

tAC(max)+ 0.6

2tAC(min)tAC(min)+2

2.5tAC(min)tAC(min)+2

38

tAC(max)+12tCK+tAC (max)+1

2.5

tAC(max)+ 0.6

tAC(min)+2

380tIS+tCK +tIH

2.5tCK+ tAC(max)+12.5tCK+ tAC(max)+1

120tIS+tCK +tIH