IS46DR16640C datasheet(20/49 Pages) ISSI

20 / 49 page

Integrated Silicon Solution, Inc. — www.issi.com

Rev. 00A

6/4/2013

IS43/46DR81280C, IS43/46DR16640C

Timing parameters by speed grade (DDR2-667 and DDR2-800) cont'd

(For information related to the entries in this table, refer to both the Guidelines and the Specific Notes following this Table.)

Parameter

Symbol

DDR2-667

DDR2-800

Units Notes

Min.

Max

Min.

Max.

Activate to activate command period

tRRD

7.5

–

7.5

–

4,32

x16

–

CAS

to CAS command delay

tCCD

–

nCK

Write recovery time

tWR

–

Auto precharge write recovery +

precharge time

tDAL

WR + tnRP

–

WR +

tnRP

–

nCK 33

Internal write to read command delay

tWTR

7.5

–

7.5

–

24, 32

Internal read to precharge command

delay

tRTP

7.5

–

7.5

–

3, 32

CKE minimum pulse width (HIGH and

LOW pulse width)

tCKE

–

nCK 27

Exit self refresh to a non-read command tXSNR

tRFC + 10

–

tRFC + 10

–

Exit self refresh to a read command

tXSRD

200

–

200

–

nCK

Exit precharge power down to any

command

tXP

–

nCK

Exit active power down to read

command

tXARD

–

nCK 1

Exit active power down to read

command (slow exit, lower power)

tXARDS

7 - AL

–

8 - AL

–

nCK 1, 2

ODT turn-on delay

tAOND

nCK 16

ODT turn-on

tAON

tAC, min

tAC,max + 0.7

tAC,min

tAC,max + 0.7

6, 16,

ODT turn-on (Power-Down mode)

tAONPD

tAC, min + 2

2 x tCK(avg) +

tAC,max + 1

tAC,min

+ 2

2 x tCK(avg) +

tAC,max + 1

ODT turn-off delay

tAOFD

2.5

nCK 17, 45

ODT turn-off

tAOF

tAC, min

tAC,max + 0.6

tAC,min

tAC,max + 0.6

17,

43, 45

ODT turn-off (Power-Down mode)

tAOFPD

tAC, min+2

2.5 x tCK(avg)

+ tAC,max + 1

tAC,min+2

2.5 x tCK(avg) +

tAC,max + 1

ODT to power down entry latency

tANPD

–

nCK

ODT Power Down Exit Latency

tAXPD

–

nCK

Mode register set command cycle time

tMRD

–

nCK

OCD drive mode output delay

tOIT

Minimum time clocks remains ON after

CKE asynchronously drops LOW

tDelay

tIS + tCK(avg)

+ tIH

–

tIS +

tCK(avg)

+ tIH

–

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