IC41C16257/IC41C16257S

IC41LV16257/IC41LV16257S

10

Integrated Circuit Solution Inc.

DR021-0A 08/11/2001

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

in a 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,

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

CAS and RAS or OE go back

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, I/O0-I/O7 by LCAS and I/O8-I/O15 by UCAS.

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. The first

χCAS edge to transition LOW.

21. The last

χCAS edge to transition HIGH.

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. Last falling

χCAS edge to first rising χCAS edge.

24. Last rising

χCAS edge to next cycleÕs last rising χCAS edge.

25. Last rising

χCAS edge to first falling χCAS edge.

26. Each

χCAS must meet minimum pulse width.

27. Last

χCAS to go LOW.

28. I/Os controlled, regardless

UCAS and LCAS.

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

30. Enables on-chip refresh and address counters.