46DR83200A Datasheet, PDF (18/48 Pages) Integrated Silicon Solution, Inc – 32Mx8, 16Mx16 DDR2 DRAM

IS43/46DR83200A, IS43/46DR16160A
Timing Parameters by Speed Grade (DDR2-400 and DDR2-533) cont'd
(For information related to the entries in this table, refer to both the Guidelines and the Specific Notes following this Table.)
Parameter
Active to active command period
Symbol
tRRD
DDR2-400
Min.
Max.
7.5
–
DDR2-533
Min.
Max.
7.5
–
Units Notes
ns 4, 32
CAS to CAS command delay
tCCD
2
–
2
–
tCK
Write recovery time
tWR
15
–
15
–
Auto precharge write recovery + precharge
time
tDAL
WR + tRP
–
WR + tRP
–
Internal write to read command delay
tWTR
10
–
7.5
–
Internal read to precharge command delay tRTP
7.5
–
7.5
–
CKE minimum pulse width (HIGH and
LOW pulse width)
tCKE
3
–
3
–
Exit self refresh to a non-read command tXSNR tRFC + 10
–
tRFC + 10
–
Exit self refresh to a read command
tXSRD
200
–
200
–
Exit precharge power down to any non-
read command
tXP
2
–
2
–
Exit active power down to read command tXARD
2
–
2
–
Exit active power down to read command
(slow exit, lower power)
tXARDS
6 - AL
–
6 - AL
–
ODT turn-on delay
tAOND
2
2
2
2
ODT turn-on
tAON
tAC(min) tAC(max)+1 tAC(min) tAC (max)+1
ODT turn-on (Power-Down mode)
ODT turn-off delay
tAONPD tAC(min)+2
tAOFD
2.5
2 x tCK +
tAC(max)+1
tAC(min) + 2
2.5
2.5
2 x tCK +
tAC(max)+1
2.5
ODT turn-off
tAOF
tAC(min) tAC(max) + 0.6 tAC(min) tAC(max) + 0.6
ODT turn-off (Power-Down mode)
ODT to power down entry latency
ODT power down exit latency
Mode register set command cycle time
MRS command to ODT update delay
OCD drive mode output delay
Minimum time clocks remains ON after
CKE asynchronously drops LOW
tAOFPD tAC(min)+2
tANPD
3
tAXPD
8
tMRD
2
tMOD
0
tOIT
0
2.5 x tCK +
tAC(max)+1
–
–
–
12
12
tAC(min)+2
3
8
2
0
0
2.5 x tCK+
tAC(max)+1
–
–
–
12
12
tDelay tIS+tCK+tIH
–
tIS+tCK+tIH
–
ns 32
tCK 14
ns 24, 32
ns 3, 32
tCK 27
ns 32
tCK
tCK
tCK 1
tCK 1, 2
tCK 16
ns
6, 16,
40
ns
tCK 17, 44
ns
17, 43,
44
ns
tCK
tCK
tCK
ns
ns 32
ns 15
18
Integrated Silicon Solution, Inc. — www.issi.com
Rev. D
08/16/2012