Transcend 1GB, 64Mx8, CL5, DIMM 240pin, DDR2, 667, ECC Unbuffered JM388Q643A-6 User Manual
Product codes
JM388Q643A-6
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240PIN DDR2 667 Unbuffered DIMM
1GB With 64Mx8 CL5
Transcend Information Inc.
9
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
Auto precharge write recovery + precharge time
tDAL tWR+tRP
X tCK
Internal write to read command delay
tWTR
7.5 X
ns
Internal read to precharge command delay
tRTP
7.5
ns
Exit self refresh to a non-read command
tXSNR
tRFC + 10
ns
Exit self refresh to a read command
tXSRD
200
tCK
Exit precharge power down to any non-read command
tXP
2 X
tCK
Exit active power down to read command
tXARD
2 X
tCK
Exit active power down to read command (Slow exit,
Lower power)
Lower power)
tXARDS
7 - AL
tCK
CKE minimum pulse width (high and low pulse width)
tCKE
3
tCK
ODT turn-on delay
tAOND
2 2
tCK
ODT turn-on
tAON
tAC(min) tAC(max)+1 ns
ODT turn-on(Power-Down mode)
tAONPD
TAC(min)+2
2tCK+
tAC(max)+1
ns
ODT turn-off delay
tAOFD
2.5 2.5
tCK
ODT turn-off
tAOF
tAC(min)
tAC(max)+ 0.6
ns
ODT turn-off (Power-Down mode) tAOFPD
TAC(min)+2
2.5tCK+
tAC(max)+1
ns
ODT to power down entry latency
tANPD
3
tCK
ODT power down exit latency
tAXPD
8
tCK
OCD drive mode output delay
tOIT
0 12
ns
Minimum time clocks remains ON after CKE
asynchronously drops LOW
asynchronously drops LOW
tDelay tIS+tCK+tIH
ns