TM124BBK32, TM124BBK32S 1048576 BY 32-BIT

TM248CBK32, TM248CBK32S 2097152 BY 32-BIT

DYNAMIC RAM MODULE

SMMS132D – JANUARY 1991 – REVISED JUNE 1995

7

POST OFFICE BOX 1443

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

temperature (unless otherwise noted)

PARAMETER

TEST CONDITIONS

’248CBK32-60

’248CBK32-70

’248CBK32-80

UNIT

PARAMETER

TEST CONDITIONS

MIN

MAX

MIN

MAX

MIN

MAX

UNIT

VOH High-level output voltage

IOH = – 5 mA

2.4

2.4

2.4

V

VOL

Low-level output voltage

IOL = 4.2 mA

0.4

0.4

0.4

V

II

Input current (leakage)

VCC = 5 V,

VI = 0 V to 6.5 V,

All other pins = 0 V to VCC

±20

±20

±20

µA

IO

Output current (leakage)

VCC = 5.5 V,

VO = 0 V to VCC,

CAS high

±20

±20

±20

µA

ICC1

Read- or write-cycle current

(see Note 3)

VCC = 5.5 V,

Minimum cycle

856

736

656

mA

ICC2 Standby current

After 1 memory cycle,

RAS and CAS high,

VIH = 2.4 V (TTL)

32

32

32

mA

ICC2 Standby current

After 1 memory cycle,

RAS and CAS high,

VIH = VCC – 0.2 V (CMOS)

16

16

16

mA

ICC3

Average refresh current

(RAS only or CBR)

(see Note 3)

VCC = 5.5 V,

Minimum cycle,

RAS cycling,

CAS high (RAS only),

RAS low after CAS low (CBR)

1680

1440

1280

mA

ICC4

Average page current

(see Note 4)

VCC = 5.5 V,

tPC = minimum,

RAS low,

CAS cycling

736

656

576

mA

NOTES:

3. Measured with a maximum of one address change while RAS = VIL

4. Measured with a maximum of one address change while CAS = VIH

capacitance over recommended ranges of supply voltage and operating free-air temperature

f = 1 MHz (see Note 5)

’124BBK32

’248CBK32

UNIT

MIN

MAX

MIN

MAX

UNIT

Ci(A)

Input capacitance, address inputs

40

80

pF

Ci(R)

Input capacitance, RAS

28

28

pF

Ci(C)

Input capacitance, CAS

14

28

pF

Ci(W)

Input capacitance, W

56

112

pF

Co(DQ) Output capacitance on DQ pins

7

14

pF

NOTE 5: VCC = 5 V ± 0.5 V and the bias on pins under test is 0 V.

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

temperature

PARAMETER

’124BBK32-60

’248CBK32-60

’124BBK32-70

’248CBK32-70

’124BBK32-80

’248CBK32-80

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

tCPA

Access time from column precharge

35

40

45

ns

tRAC

Access time from RAS low

60

70

80

ns

tCLZ

CAS to output in low Z

0

0

0

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.