K4S281632B

Rev. 0.0 Aug. 1999

CMOS SDRAM

Parameter

Value

Unit

AC input levels (Vih/Vil)

2.4/0.4

V

Input timing measurement reference level

1.4

V

Input rise and fall time

tr/tf = 1/1

ns

Output timing measurement reference level

1.4

V

Output load condition

See Fig. 2

3.3V

1200

Ω

870

Ω

Output

50pF

Vtt = 1.4V

50

Ω

Output

50pF

Z0 = 50

Ω

(Fig. 2) AC output load circuit

(Fig. 1) DC output load circuit

OPERATING AC PARAMETER

1. The minimum number of clock cycles is determined by dividing the minimum time required with clock cycle time

and then rounding off to the next higher integer.

2. Minimum delay is required to complete write.

3. All parts allow every cycle column address change.

4. In case of row precharge interrupt, auto precharge and read burst stop.

5. For -80/1H/1L/10, tRDL=1CLK and tDAL=1CLK+20ns is also supported .

SAMSUNG recommends tRDL=2CLK and tDAL=2CLK + 20ns.

Notes :

(AC operating conditions unless otherwise noted)

Parameter

Symbol

Version

Unit

Note

- 75

- 80

- 1H

- 1L

-10

Row active to row active delay

15

16

20

20

20

ns

1

RAS to CAS delay

20

20

20

20

24

ns

1

Row precharge time

20

20

20

20

24

ns

1

Row active time

45

48

50

50

50

ns

1

100

us

Row cycle time

65

68

70

70

80

ns

1

Last data in to row precharge

2

CLK

2,5

Last data in to Active delay

2 CLK + 20 ns

-

5

Last data in to new col. address delay

1

CLK

2

Last data in to burst stop

1

CLK

2

Col. address to col. address delay

1

CLK

3

Number of valid output data

CAS latency=3

2

ea

4

CAS latency=2

-

1