K4B2G1646C-HCF8 View Datasheet(PDF) - Samsung

Part Name

Description

MFG CO.

K4B2G1646C-HCF8

2Gb C-die DDR3 SDRAM

Samsung 

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K4B2G1646C

datasheet

Rev. 1.11

DDR3 SDRAM

13.2 Refresh Parameters by Device Density

[ Table 42 ] Refresh parameters by device density

Parameter

Symbol

1Gb

2Gb

4Gb

8Gb

Units NOTE

All Bank Refresh to active/refresh cmd time

tRFC

110

160

300

350

ns

Average periodic refresh interval

0 °C ≤ TCASE ≤ 85°C

7.8

7.8

7.8

7.8

µs

tREFI

85 °C < TCASE ≤ 95°C

3.9

3.9

3.9

3.9

µs

1

NOTE :

1. Users should refer to the DRAM supplier data sheet and/or the DIMM SPD to determine if DDR3 SDRAM devices support the following options or requirements referred to in

this material.

13.3 Speed Bins and CL, tRCD, tRP, tRC and tRAS for corresponding Bin

DDR3 SDRAM Speed Bins include tCK, tRCD, tRP, tRAS and tRC for each corresponding bin.

[ Table 43 ] DDR3-800 Speed Bins

Speed

CL-nRCD-nRP

Parameter

Internal read command to first data

ACT to internal read or write delay time

PRE command period

ACT to ACT or REF command period

ACT to PRE command period

CL = 5

CWL = 5

CL = 6

CWL = 5

Supported CL Settings

Supported CWL Settings

Symbol

tAA

tRCD

tRP

tRC

tRAS

tCK(AVG)

tCK(AVG)

DDR3-800

6-6-6

min

max

15

20

15

-

15

-

52.5

-

37.5

9*tREFI

3.0

3.3

2.5

3.3

5,6

5

[ Table 44 ] DR3-1066 Speed Bins

Speed

CL-nRCD-nRP

Parameter

Internal read command to first data

ACT to internal read or write delay time

PRE command period

ACT to ACT or REF command period

ACT to PRE command period

CL = 5

CL = 6

CL = 7

CL = 8

Supported CL Settings

Supported CWL Settings

CWL = 5

CWL = 6

CWL = 5

CWL = 6

CWL = 5

CWL = 6

CWL = 5

CWL = 6

Symbol

tAA

tRCD

tRP

tRC

tRAS

tCK(AVG)

tCK(AVG)

tCK(AVG)

tCK(AVG)

tCK(AVG)

tCK(AVG)

tCK(AVG)

tCK(AVG)

min

13.125

13.125

13.125

50.625

37.5

DDR3-1066

7-7-7

max

20

-

-

-

9*tREFI

3.0

3.3

2.5

1.875

1.875

Reserved

Reserved

Reserved

Reserved

5,6,7,8

5,6

3.3

<2.5

<2.5

Units

ns

ns

ns

ns

ns

ns

ns

nCK

nCK

NOTE

1,2,3,4,11,12

1,2,3

Units

ns

ns

ns

ns

ns

ns

ns

ns

ns

ns

ns

ns

ns

nCK

nCK

NOTE

1,2,3,4,5,11,

12

4

1,2,3,5

1,2,3,4

4

1,2,3,4,10

4

1,2,3

- 38 -

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