IS41C44002 ICSI [Integrated Circuit Solution Inc], IS41C44002 Datasheet - Page 9

• Manufacturer Part Number: IS41C44002
• Description: 4Mx4 bit Dynamic RAM with EDO Page Mode
• Manufacturer: ICSI [Integrated Circuit Solution Inc]

IC41C4400x and IC41LV4400x Series
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
2. V
3. In addition to meeting the transition rate specification, all input signals must transit between V
4. If CAS and RAS = V
5. If CAS = V
6. Measured with a load equivalent to one TTL gate and 50 pF.
7. Assumes that t
8. Assumes that t
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
10. Operation with the t
11. Operation within the t
12. Either t
13. t
14. t
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
17. Write command is defined as WE going low.
18. LATE WRITE and READ-MODIFY-WRITE cycles must have both t
19. The I/Os are in open during READ cycles once t
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-
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.
Integrated Circuit Solution Inc.
DR007-0B 10/17/2002
operation is assured. The eight RAS cycles wake-up should be repeated any time the t
and V
in a monotonic manner.
by the amount that t
data output buffer, CAS and RAS must be pulsed for t
is greater than the specified t
is greater than the specified t
(MIN), the cycle is an EARLY WRITE cycle and the data output will remain open circuit throughout the entire cycle. If t
(MIN), t
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
to V
LATE WRITE or READ-MODIFY-WRITE is not possible.
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 OE is taken back to LOW after t
MODIFY-WRITE cycles.
WCS
OFF
IH
(MIN) and V
IH
, t
(MAX) defines the time at which the output achieves the open circuit condition; it is not a reference to V
) is indeterminate. OE held HIGH and WE taken LOW after CAS goes LOW result in a LATE WRITE (OE-controlled) cycle.
IL
RWD
RCH
AWD
(or between V
, t
IL
or t
AWD
> t
, data output may contain data from the last valid READ cycle.
AWD
RRH
RCD
RCD
and t
IL
(MAX) are reference levels for measuring timing of input signals. Transition times, are measured between V
(MIN) and t
must be satisfied for a READ cycle.
< t
> t
RCD
RCD
IH
CWD
RAD
RCD
RCD
IL
, data output is High-Z.
(MAX) limit ensures that t
and V
exceeds the value shown.
are restrictive operating parameters in LATE WRITE and READ-MODIFY-WRITE cycle only. If t
(MAX) limit ensures that t
(MAX).
(MAX). If t
RCD
RAD
CWD
IH
) and assume to be 1 ns for all inputs.
(MAX) limit, access time is controlled exclusively by t
(MAX) limit, access time is controlled exclusively by t
> t
RCD
OEH
CWD
is greater than the maximum recommended value shown in this table, t
is met.
(MIN), the cycle is a READ-WRITE cycle and the data output will contain data read from
OD
RAC
RCD
or t
(MAX) can be met. t
(MAX) can be met. t
CP
OFF
.
occur.
OD
and t
OEH
RCD
RAD
met (OE HIGH during WRITE cycle) in order to ensure
(MAX) is specified as a reference point only; if t
(MAX) is specified as a reference point only; if t
AA
CAC
REF
.
.
refresh requirement is exceeded.
IH
and V
IL
(or between V
OH
RAC
or V
will increase
OL
RWD
IL
WCS
.
and V
> t
> t
RWD
WCS
RCD
RAD
IH
IH
9
)