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IDT6178S20YB

CMOS StaticRAM 16K (4K x 4-BIT) CACHE-TAG RAM

Integrated Device Technology 

IDT6178S

CMOS StaticRAM 16K (4K x 4-BIT) CACHE-TAG RAM

MILITARY AND COMMERCIAL TEMPERATURE RANGE

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

6178S10(1)

6178S12

6178S15

Symbol

Parameter

Write Cycle

tWC

Write Cycle Time

tAW

Address Valid to End-of-Write

tAS

Address Set-up Time

tWP

Write Pulse Width

tWR

Write Recovery Time

tDW

Data Valid to End-of-Write

tDH

Data Hold from Write Time

tWHZ(2)

Write Enable to Output in High-Z

tOW(2)

Output Active from End-of-Write

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

10

—

12

—

15

—

8

—

10

—

12

—

0

—

0

—

0

—

8

—

10

—

12

—

0

—

0

—

0

—

6

—

8

—

10

—

0

—

0

—

0

—

—

5

—

6

—

7

0

—

0

—

0

—

NOTES:

1. 0°C to +70°C temperature range only.

2. This parameter guaranteed with AC load (Figure 3) by device characterization, but is not production tested.

6178S20/25

Min. Max.

20

—

14

—

0

—

14

—

0

—

12

—

0

—

—

9

0

—

Unit

ns

ns

ns

ns

ns

ns

ns

ns

ns

2953 tbl 12

TIMING WAVEFORM OF WRITE CYCLE(1,3)

tWC

ADDRESS

tAS

WE

tAW

tWP

tWHZ (4)

tWR

tOW (4)

DATAOUT

(2)

(2)

(4)

tDW

(4)

tDH

DATAIN

DATAIN VALID

2953 drw 10

NOTES:

1. WE must be HIGH during all address transitions.

2. During this period, I/O pins are in the output state and the input signals must not be applied.

3. OE is HIGH. If OE is LOW during a WE controlled write cycle, the write pulse width must be the greater of tWP or (tWHZ + tDW) to allow the I/O drivers to

turn off and data to be placed on the bus for the required tDW. If OE is HIGH during a WE controlled write cycle, this requirement does not apply and the

write pulse is the specified tWP.

4. Transition is measured ±200mV from steady state.

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

6178S10(1)

6178S12

6178S15

Symbol

Parameter

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

Clear Cycle

tCLPW(2)

CLR Pulse Width

tCLRC

CLR HIGH to WE LOW

tPOCL(3)

Power on Reset

tWECL

WE HIGH to Clear HIGH

12

—

15

—

20

—

5

—

5

—

5

—

50

—

60

—

80

—

5

—

5

—

5

—

NOTES:

1. 0°C to +70°C temperature range only.

2. Recommended duty cycle of 10% maximum.

3. This parameter guaranteed with AC load (Figure 3) by device characterization, but is not production tested.

6178S20/25

Min. Max.

25

—

5

—

100

—

5

—

Unit

ns

ns

ns

ns

2953 tbl 13

11.1

6

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