8

Integrated Silicon Solution, Inc. — 1-800-379-4774

Rev. C

06/24/01

Notes:

1. An initial pause of 200 µs is required after power-up followed by eight

RAS refresh cycle (RAS-Only or CBR) before proper device

operation is assured. The eight

monotonic manner.

4. If

5. If

6. Measured with a load equivalent to one TTL gate and 50 pF.

9. If

CAS is LOW at the falling edge of RAS, data out will be maintained from the previous cycle. To initiate a new cycle and clear the data

output buffer,

cell. If neither of the above conditions is met, the state of I/O (at access time and until

indeterminate.

OE held HIGH and WE taken LOW after CAS goes LOW result in a LATE WRITE (OE-controlled) cycle.

15. Output parameter (I/O) is referenced to corresponding

CAS input.

16. During a READ cycle, if

OE is LOW then taken HIGH before CAS goes HIGH, I/O goes open. If OE is tied permanently LOW, a LATE

WRITE or READ-MODIFY-WRITE is not possible.

17. Write command is defined as

WE going low.

OE HIGH during WRITE cycle) in order to ensure

that the output buffers will be open during the WRITE cycle. The I/Os will provide the previously written data if

CAS remains LOW and

20. Determined by falling edge of

CAS.

21. Determined by rising edge of

CAS.

22. These parameters are referenced to

CAS leading edge in EARLY WRITE cycles and WE leading edge in LATE WRITE or

READ-MODIFY-WRITE cycles.

23.

CAS must meet minimum pulse width.

24. The 3 ns minimum is a parameter guaranteed by design.

25. Enables on-chip refresh and address counters.