TMS416409A, TMS417409A, TMS426409A, TMS427409A

4194304 BY 4-BIT EXTENDED DATA OUT

DYNAMIC RANDOM-ACCESS MEMORIES

SMKS893B – AUGUST 1996 – REVISED APRIL 1997

13

POST OFFICE BOX 1443

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

f = 1 MHz (see Note 3)

PARAMETER

MIN

MAX

UNIT

Ci(A)

Input capacitance, A0 – A11†

5

pF

Ci(OE)

Input capacitance, OE

7

pF

Ci(RC)

Input capacitance, CAS and RAS

7

pF

Ci(W)

Input capacitance, W

7

pF

Co

Output capacitance‡

7

pF

† A11 is NC (no internal connection) for TMS417409A and TMS427409A.

‡ CAS and OE = VIH to disable outputs

NOTE 3: VCC = NOM supply voltage ± 10%, and the bias on pins under test is 0 V.

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

temperature (see Note 4)

PARAMETER

’41x409A-50

’42x409A-50

’41x409A-60

’42x409A-60

’41x409A-70

’42x409A-70

UNIT

MIN

MAX

MIN

MAX

MIN

MAX

tAA

Access time from column address (see Note 5)

25

30

35

ns

tCAC

Access time from CAS (see Note 5)

13

15

18

ns

tCPA

Access time from CAS precharge (see Note 5)

28

35

40

ns

tRAC

Access time from RAS (see Note 5)

50

60

70

ns

tOEA

Access time from OE (see Note 5)

13

15

18

ns

tCLZ

Delay time, CAS to output in low impedance

0

0

0

ns

tREZ

Output buffer turn off delay from RAS (see Note 6)

3

13

3

15

3

18

ns

tCEZ

Output buffer turn off delay from CAS (see Note 6)

3

13

3

15

3

18

ns

tOEZ

Output buffer turn off delay from OE (see Note 6)

3

13

3

15

3

18

ns

tWEZ

Output buffer turn off delay from W (see Note 6)

3

13

3

15

3

18

ns

NOTES:

4. With ac parameters, it is assumed that tT = 2 ns.

5. For TMS42x409A, access times are measured with output reference levels of VOH = 2 V and VOL = 0.8 V.

6. The maximum values of tREZ, tCEZ, tOEZ, and tWEZ are specified when the output is no longer driven. Data in should not be driven

until one of the applicable maximum specifications is satisfied.