Infineon 1024MB, 800MHz, DDR II, PC6400, CL6 HYS64T128000EU-2.5C2 Manuale Utente

HYS[64/72]T512020EU–[25F/2.5/3S]–A

Unbuffered DDR2 SDRAM Modules

 Internet Data Sheet

Rev. 1.0, 2008-06

19

06112008-YHWK-B105

1)

DDQ

 = 1.8 V ± 0.1V; 

DD

 = 1.8 V ± 0.1 V. 

2) Timing that is not specified is illegal and after such an event, in order to guarantee proper operation, the DRAM must be powered down 

and then restarted through the specified initialization sequence before normal operation can continue.

3) Timings are guaranteed with CK/CK differential Slew Rate of 2.0 V/ns. For DQS signals timings are guaranteed with a differential Slew 

Rate of 2.0 V/ns in differential strobe mode and a Slew Rate of 1 V/ns in single ended mode. 

4) The CK / CK input reference level (for timing reference to CK / CK) is the point at which CK and CK cross. The DQS / DQS, RDQS /  RDQS, 

input reference level is the crosspoint when in differential strobe mode.

5) Inputs are not recognized as valid until 

REF

 stabilizes. During the period before 

REF

 stabilizes, CKE = 0.2 x 

DDQ

 is recognized as low.

6) The output timing reference voltage level is 

TT

. 

7) New units, ‘

CK.AVG

‘ and ‘nCK‘, are introduced in DDR2–667 and DDR2–800. Unit ‘

CK.AVG

‘ represents the actual 

CK.AVG

 of the input clock 

under operation. Unit ‘nCK‘ represents one clock cycle of the input clock, counting the actual clock edges. Note that in DDR2–400 and 

DQS/DQS low-impedance time from 
CK / CK

LZ.DQS

AC.MIN

AC.MAX

AC.MIN

AC.MAX

ps

MRS command to ODT update delay

MOD

0

12

0

12

ns

Mode register set command cycle 
time

MRD

2

—

2

—

nCK

OCD drive mode output delay

OIT

0

12

0

12

ns

DQ/DQS output hold time from DQS

QH

HP

–

QHS

—

HP

–

QHS

—

ps

DQ hold skew factor

QHS

—

300

—

340

ps

Average periodic refresh Interval

REFI

—

7.8

—

7.8

μs

—

3.9

—

3.9

μs

Auto-Refresh to Active/Auto-Refresh 
command period

RFC

127.5

—

127.5

—

ns

Read preamble

RPRE

0.9

1.1

0.9

1.1

CK.AVG

Read postamble

RPST

0.4

0.6

0.4

0.6

CK.AVG

Active to active command period for 
1KB page size products

RRD

7.5

—

7.5

—

ns

Internal Read to Precharge command 
delay

RTP

7.5

—

7.5

—

ns

Write preamble

WPRE

0.35

—

0.35

—

CK.AVG

Write postamble

WPST

0.4

0.6

0.4

0.6

CK.AVG

Write recovery time 

WR

15

—

15

—

ns

Internal write to read command delay

WTR

7.5

—

7.5

—

ns

Exit power down to read command

XARD

2

—

2

—

nCK

Exit active power-down mode to read 
command (slow exit, lower power)

XARDS

8 – AL

—

7 – AL

—

nCK

Exit precharge power-down to any 
valid command (other than NOP or 
Deselect) 

XP

2

—

2

—

nCK

Exit self-refresh to a non-read 
command

XSNR

RFC

+10

—

RFC

+10

—

ns

Exit self-refresh to read command

XSRD

200

—

200

—

nCK

Write command to DQS associated 
clock edges

WL

RL – 1

RL–1

nCK