Dataram DTM65525B Datasheet download pdf (Page 11)

DTM65525B

2 GB, 240-Pin DDR2 FB-DIMM

DRAM AC Characteristics (AC operating conditions unless otherwise noted)

Parameter Symbol

Min

Value

Max

Value

Unit Note

Row Cycle Time

57.5 - ns

Auto Refresh Row Cycle Time

RFC

105 - ns

Row Active Time

RAS

45 70K ns

Row Address to Column Address Delay

RCD

12.5 - ns

Row Active to row Active Delay

RRD

7.5 - ns

Column Address to Column Address Delay

CCD

2 - CLK

Row Precharge time

12.5 - ns

Write Recovery Time

15 - ns

Auto Precharge Write Recovery + Precharge Time

DAL

/ t

)

+ (t

)

- ns

System Clock Cycle Time

2500 8000 ps

Clock High Level Width

0.48 0.52 CLK

Clock Low Level Width

0.48 0.52 CLK

DQ output access time from CK & /CK

-0.400 +0.400 ns

DQS-Out edge to Clock Edge skew

DQSCK

-0.350 +0.350 ns

DQS-Out edge to Data-out edge skew

DQSQ

- 0.200 ns

Data-Out hold time from DQS

- t

QHS

- ns 1

Data hold skew factor

QHS

- 0.300 ns 1

Clock Half Period

min (t

, t

) - ns 1

Input Setup Time (fast slew rate)

0.175 - ns 2,3,5,6

Input Hold Time (fast slew rate)

0.250 - ns 2,3,5,6

Input Pulse Width

IPW

0.6 - CLK 6

Write DQS High Level Width

DQSH

0.35 - CLK

Write DQS Low Level Width

DQSL

0.35 - CLK

CLK to First Rising edge to DQS-In

DQSS

-0.25 +0.25 CLK

Data-In Setup Time to DQS-In (DQ & DM)

0.050 - ns 7

Data-In Hold Time to DQS-In (DQ & DM)

0.125 - ns 7

NOTES:

1. This calculation accounts for t

DQSQ

(max), the pulse width distortion of on-chip and jitter.

2. Data sampled at the rising edges of the clock: A0~A13, BA0~BA2, CKE, /S[1:0], /RAS, /CAS, /WE

3. For command/address input slew rate > = 1.0V/ns

4. For command/address input slew rate > = 0.5V/ns and <1.0V/ns

5. CK,/CK slew rates are > = 1.0V/ns

6. These Parameters guarantee device timing, but they are not necessarily tested on each device, and they may be

guaranteed by design or tester correlation.

7. Data latched at both rising and falling edges of Data Strobes (DQS)

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 17 18

DTM65525B 1

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Dataram DTM65525B Datasheet Page 11

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