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IDT72805LB

CMOS DUAL SyncFIFO DUAL 256 x 18 DUAL 512 x 18 DUAL 1,024 x 18 DUAL 4,096 x 18

Integrated Device Technology 

IDT72805LB/72815LB/72825LB/72845LB CMOS Dual SyncFIFOTM

256 x 18, 512 x 18, 1,024 x 18, and 4,096 x 18

COMMERCIAL AND INDUSTRIAL

TEMPERATURE RANGES

AC ELECTRICAL CHARACTERISTICS

(Commercial: VCC = 5V ± 10%, TA = 0°C to +70°C; Industrial: VCC = 5V ± 10%, TA = -40°C + 85°C)

Commercial

Com’l & Ind’l(1)

Symbol

fS

tA

tCLK

tCLKH

tCLKL

tDS

tDH

tENS

tENH

tRS

tRSS

tRSR

tRSF

tOLZ

tOE

tOHZ

tWFF

tREF

tPAFA

Parameter

Clock Cycle Frequency

Data Access Time

Clock Cycle Time

Clock HIGH Time

Clock LOW Time

Data Setup Time

Data Hold Time

Enable Setup Time

Enable Hold Time

Reset Pulse Width(2)

Reset Setup Time

Reset Recovery Time

Reset to Flag and Output Time

Output Enable to Output in Low-Z(3)

Output Enable to Output Valid

Output Enable to Output in High-Z(3)

Write Clock to Full Flag

Read Clock to Empty Flag

Clock to Asynchronous Programmable

Almost-Full Flag

IDT72805LB10

IDT72815LB10

IDT72825LB10

IDT72845LB10

Min.

Max.

—

100

2

6.5

10

—

4.5

—

4.5

—

3

—

0

—

3

—

0

—

10

—

8

—

8

—

—

15

0

—

—

6

1

6

—

6.5

—

6.5

—

17

IDT72805LB15

IDT72815LB15

IDT72825LB15

IDT72845LB15

Min.

Max.

—

66.7

2

10

15

—

6

—

6

—

4

—

1

—

4

—

1

—

15

—

10

—

10

—

—

15

0

—

—

8

1

8

—

10

—

10

—

20

tPAFS

Write Clock to Synchronous

Programmable Almost-Full Flag

tPAEA

Clock to Asynchronous Programmable

Almost-Empty Flag

—

8

—

10

—

17

—

20

tPAES

tHF

tXO

tXI

tXIS

tSKEW1

tSKEW2(4)

Read Clock to Synchronous

Programmable Almost-Empty Flag

Clock to Half-Full flag

Clock to Expansion Out

Expansion In Pulse Width

Expansion In Setup Time

Skew time between Read Clock &

Write Clock for FF/IR and EF/OR

Skew time between Read Clock &

Write Clock for PAE and PAF

—

8

—

10

—

17

—

20

—

6.5

—

10

3

—

6.5

—

3

—

5

—

5

—

6

—

12

—

15

—

Commercial

IDT72805LB25

IDT72815LB25

IDT72825LB25

IDT72845LB25

Min.

Max.

—

40

3

15

25

—

10

—

10

—

6

—

1

—

6

—

1

—

25

—

15

—

15

—

—

25

0

—

—

12

1

12

—

15

—

15

—

35

—

12

—

35

—

12

—

35

—

15

10

—

10

—

10

—

17

—

NOTES:

1. Industrial Temperature Range Product for the 15ns speed grade is available as a standard device.

2. Pulse widths less than minimum values are not allowed.

3. Values guaranteed by design, not currently tested.

4. tSKEW2 applies to synchronous PAE and synchronous PAF only.

5V

1.1K

AC TEST CONDITIONS

Input Pulse Levels

Input Rise/Fall Times

Input Timing Reference Levels

Output Reference Levels

Output Load

GND to 3.0V

3ns

1.5V

1.5V

See Figure 1

D.U.T.

680Ω

30pF*

3139 drw 03

Figure 1. Output Load

* Includes jig and scope capacitances.

Unit

MHz

ns

ns

ns

ns

ns

ns

ns

ns

ns

ns

ns

ns

ns

ns

ns

ns

ns

ns

ns

ns

ns

ns

ns

ns

ns

ns

ns

6

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