IDT71256 View Datasheet(PDF) - Integrated Device Technology

Part Name

Description

Manufacturer

IDT71256

BiCMOS StaticRAM 240K (16K x 15-BIT) CACHE-TAG RAM For the PentiumO Processor

Integrated Device Technology 

IDT71256 S/L

CMOS STATIC RAM 256K (32K x 8-BIT)

MILITARY AND COMMERCIAL TEMPERATURE RANGES

AC ELECTRICAL CHARACTERISTICS (VCC = 5.0V ± 10%, All Temperature Ranges)

71256S55(1)

71256L55(1)

71256S70(1)

71256L70(1)

71256S85(1)

71256L85(1)

Symbol

Parameter

Min. Max. Min. Max. Min. Max.

Read Cycle

tRC

Read Cycle Time

55

—

70

—

85

—

tAA

Address Access Time

—

55

—

70

—

85

tACS

tCLZ(2)

tCHZ(2)

Chip Select Access Time

Chip Deselect to Output in Low-Z

Output Enable to Output in Low-Z

—

55

5

—

—

25

—

70

5

—

—

30

—

85

5

—

—

35

tOE

tOLZ(2)

tOHZ(2)

Output Enable to Output Valid

Output Enable to Output in Low-Z

Output Disable to Output in High-Z

—

25

0

—

0

25

—

30

0

—

0

30

—

35

0

—

—

35

tOH

Output Hold from Address Change

5

—

5

—

5

—

Write Cycle

tWC

Write Cycle Time

55

—

70

—

85

—

tCW

Chip Select to End-of-Write

50

—

60

—

70

—

tAW

Address Valid to End-of-Write

50

—

60

—

70

—

tAS

Address Set-up Time

0

—

0

—

0

—

tWP

Write Pulse Width

40

—

45

—

50

—

tWR

Write Recovery Time

0

—

0

—

0

—

tDW

tDH

tWHZ(2)

tOW(2)

Data to Write Time Overlap

Data Hold from Write Time (WE)

Write Enable to Output in High-Z

Output Active from End-of-Write

25

—

0

—

—

25

5

—

30

—

0

—

—

30

5

—

35

—

0

—

—

35

5

—

NOTES:

1. –55°C to +125°C temperature range only.

2. This parameter guaranteed by device characterization, but is not production tested.

3. Also available: 120 and 150 ns military devices.

71256S100(1,3)

71256L100(1,3)

Min. Max.

Unit

100 — ns

— 100 ns

— 100 ns

5

— ns

—

40 ns

—

40 ns

0

— ns

—

40 ns

5

— ns

100 — ns

80

— ns

80

— ns

0

— ns

55

— ns

0

— ns

40

— ns

0

— ns

—

40 ns

5

— ns

2946 tbl 11

7.2

6

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