EDS1216AHTA-6B-E datasheet(7/50 Pages) ELPIDA

Part #	EDS1216AHTA-6B-E

Description	128M bits SDRAM

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Manufacturer	ELPIDA [Elpida Memory]

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EDS1216AHTA

Data Sheet E1160E20 (Ver. 2.0)

7

AC Characteristics (TA = 0

°C to +70°C, VDD, VDDQ = 3.3V ± 0.3V, VSS, VSSQ = 0V)

-6B

-75

Parameter

Symbol

min.

max.

min.

max.

Unit

Notes

System clock cycle time

(CL = 2)

tCK

10

—

10

—

ns

1

(CL = 3)

tCK

6

—

7.5

—

ns

1

CLK high pulse width

tCH

2.5

—

2.5

—

ns

1, 5

CLK low pulse width

tCL

2.5

—

2.5

—

ns

1, 5

Access time from CLK

tAC

—

5.4

—

5.4

1, 2, 5

Data-out hold time

tOH

3

—

3

—

ns

1, 2, 5

CLK to Data-out low impedance

tLZ

0

—

0

—

ns

1, 2, 3, 5

CLK to Data-out high impedance

tHZ

—

5.4

—

5.4

ns

1, 4

Input setup time

tSI

1.5

—

1.5

—

ns

1, 5

Input hold time

tHI

0.8

—

0.8

—

ns

1, 5

Ref/Active to Ref/Active command

period

tRC

60

—

67.5

—

ns

1

Active to Precharge command

period

tRAS

42

120000

45

120000

ns

1

Active command to column

command

(same bank)

tRCD

18

—

20

—

ns

1

Precharge to active command

period

tRP

18

—

20

—

ns

1

Write recovery or data-in to

precharge lead time

tDPL

10

—

10

—

ns

1

Last data into active latency

(tCK < 10)

tDAL

2CLK + 18ns

—

2CLK + 20ns

—

(tCK

≥ 10)

tDAL

1CLK + 20ns

—

1CLK + 20ns

—

Active (a) to Active (b) command

period

tRRD

12

—

15

—

ns

1

Transition time (rise and fall)

tT

—

5.0

—

5.0

ns

Refresh period

(4096 refresh cycles)

tREF

—

64

—

64

ms

Notes: 1. AC measurement assumes tT = 0.5ns. Reference level for timing of input signals is 1.4V.

2. Access time is measured at 1.4V. Load condition is CL = 50pF.

3. tLZ (min.) defines the time at which the outputs achieves the low impedance state.

4. tHZ (max.) defines the time at which the outputs achieves the high impedance state.

5. If tT ≥ 1ns, each parameters is changed as follows;

tAC, tOH, tLZ: should be added (tT (rise)/2 – 0.5)

tCH, tCL, tSI, tHI: should be added {(tT (rise) + tT (fall))/2 – 1}

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