TM124MBK36E, TM124MBK36T 1048576 BY 36-BIT DYNAMIC RAM MODULE

TM248NBK36E, TM248NBK36T 2097152 BY 36-BIT DYNAMIC RAM MODULE

SMMS139 – MARCH 1994

10

POST OFFICE BOX 1443

timing requirements over recommended ranges of supply voltage and operating free-air

temperature (continued)

’124MBK36E - 60

’248NBK36E - 60

’124MBK36E - 70

’248NBK36E - 70

’124MBK36E - 80

’248NBK36E - 80

UNIT

MIN

MAX

MIN

MAX

MIN

MAX

tCAH

Hold time, column address after CAS low

10

15

15

ns

tDHR

Hold time, data after RAS low (see Note 10)

50

55

60

ns

tDH

Hold time, data

10

15

15

ns

tAR

Hold time, column address after RAS low (see Note 10)

50

55

60

ns

tCLCH

Hold time, CAS low to CAS high

5

5

5

ns

tRAH

Hold time, row address after RAS low

10

10

10

ns

tRCH

Hold time, read after CAS high (see Note 11)

0

0

0

ns

tRRH

Hold time, read after RAS high (see Note 11)

0

0

0

ns

tWCH

Hold time, write after CAS low

15

15

15

ns

tWCR

Hold time, write after RAS low (see Note 10)

50

55

60

ns

tWHR

Hold time, W high (see Note 9)

10

10

10

ns

tCHR

Delay time, RAS low to CAS high (see Note 9)

15

15

20

ns

tCRP

Delay time, CAS high to RAS low

0

0

0

ns

tCSH

Delay time, RAS low to CAS high

60

70

80

ns

tCSR

Delay time, CAS low to RAS low (see Note 9)

10

10

10

ns

tRAD

Delay time, RAS low to column address (see Note 12)

15

30

15

35

15

40

ns

tRAL

Delay time, column address to RAS high

30

35

40

ns

tCAL

Delay time, column address to CAS high

30

35

40

ns

tRCD

Delay time, RAS low to CAS low (see Note 12)

20

45

20

52

20

60

ns

tRPC

Delay time, RAS high to CAS low (see Note 9)

0

0

0

ns

tRSH

Delay time, CAS low to RAS high

15

18

20

ns

tREF

Refresh time interval

16

16

16

ms

tT

Transition time

2

50

2

50

2

50

ns

NOTES:

9. CAS-before-RAS refresh only

10. The minimum value is measured when tRCD is set to tRCD min as a reference.

11. Either tRRH or tRCH must be satisfied for a read cycle.

12. The maximum value is specified only to assure access time.