TM124FBK32, TM124FBK32S 1048576 BY 32-BIT

TM248GBK32, TM248GBK32S 2097152 BY 32-BIT

DYNAMIC RAM MODULES

SMMS664A – DECEMBER 1995 – REVISED JUNE 1996

8

POST OFFICE BOX 1443

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

temperature

PARAMETER

’124FBK32-60

’248GBK32-60

’124FBK32-70

’248GBK32-70

’124FBK32-80

’248GBK32-80

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 the low-impedance state

0

0

0

ns

tREZ

Output disable time after RAS high (see Note 6)

3

15

3

18

3

20

ns

tWEZ

Output disable time after W low (see Note 6)

3

15

3

18

3

20

ns

NOTE 6: tREZ and tWEZ are specified when the output is no longer driven.

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

temperature

’124FBK32-60

’248GBK32-60

’124FBK32-70

’248GBK32-70

’124FBK32-80

’248GBK32-80

UNIT

MIN

MAX

MIN

MAX

MIN

MAX

tHPC

Cycle time, EDO page-mode read or write

25

30

35

ns

tPRWC

Cycle time, EDO read-write

80

90

100

ns

tCSH

Hold time, CAS from RAS

50

55

60

ns

tDOH

Hold time, output from CAS

3

3

3

ns

tCAS

Pulse duration, CAS

10

10 000

12

10 000

15

10 000

ns

tWPE

Pulse duration, W (output disable only)

5

5

5

ns

tCP

Precharge time, CAS

5

5

5

ns