TM124MBK36F, TM124MBK36U 1048576 BY 36-BIT DRAM MODULE

TM248NBK36F, TM248NBK36U 2097152 BY 36-BIT DRAM MODULE

SMMS650A – APRIL 1995 – REVISED JUNE 1995

7

POST OFFICE BOX 1443

switching characteristics over recommended ranges of supply voltage and operating free-air

temperature

PARAMETER

’124MBK36F - 60

’248NBK36F - 60

’124MBK36F - 70

’248NBK36F - 70

’124MBK36F - 80

’248NBK36F - 80

UNIT

MIN

MAX

MIN

MAX

MIN

MAX

tAA

Access time from column address

30

35

40

ns

tCAC

Access time from CAS low

15

18

20

ns

tRAC

Access time from RAS low

60

70

80

ns

tCPA

Access time from column precharge

35

40

45

ns

tCLZ

CAS to output in low-impedance state

0

0

0

ns

tOH

Output disable time from start of CAS high

3

3

3

ns

tOFF

Output disable time after CAS high (see Note 6)

0

15

0

18

0

20

ns

NOTE 6: tOFF is specified when the output is no longer driven.

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

temperature

’124MBK36F - 60

’248NBK36F - 60

’124MBK36F - 70

’248NBK36F - 70

’124MBK36F - 80

’248NBK36F - 80

UNIT

MIN

MAX

MIN

MAX

MIN

MAX

tRC

Cycle time, random read or write (see Note 7)

110

130

150

ns

tPC

Cycle time, page-mode read or write (see Notes 7 and 8)

40

45

50

ns

tRASP

Pulse duration, page mode, RAS low

60

100 000

70

100 000

80

100 000

ns

tRAS

Pulse duration, nonpage mode, RAS low

60

10 000

70

10 000

80

10 000

ns

tCAS

Pulse duration, CAS low

15

10 000

18

10 000

20

10 000

ns

tCP

Pulse duration, CAS high (precharge)

10

10

10

ns

tRP

Pulse duration, RAS high (precharge)

40

50

60

ns

tWP

Pulse duration, W low

10

10

10

ns

tASC

Setup time, column address before CAS low

0

0

0

ns

tASR

Setup time, row address before RAS low

0

0

0

ns

tDS

Setup time, data before CAS low

0

0

0

ns

tRCS

Setup time, W high before CAS low

0

0

0

ns

tCWL

Setup time, W low before CAS high

15

18

20

ns

tRWL

Setup time, W low before RAS high

15

18

20

ns

tWCS

Setup time, W low before CAS low

0

0

0

ns

tWRP

Setup time, W high before RAS low (CBR refresh only)

10

10

10

ns

tCAH

Hold time, column address after CAS low

10

15

15

ns

tRHCP

Hold time, RAS high from CAS precharge

35

40

45

ns

tDH

Hold time, data after CAS low

10

15

15

ns

tRAH

Hold time, row address after RAS low

10

10

10

ns

tRCH

Hold time, W high after CAS high (see Note 9)

0

0

0

ns

tRRH

Hold time, W high after RAS high (see Note 9)

0

0

0

ns

tWCH

Hold time, W low after CAS low

10

15

15

ns

tWRH

Hold time, W high after RAS low (CBR refresh only)

10

10

10

ns

NOTES:

7. All cycles assume tT = 5 ns.

8. To assure tPC min, tASC should be ≥ tCP.

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