¡ Semiconductor
MSM514262
Notes: 1. These parameters depend on output loading. Specified values are obtained with
the output open.
2. These parameters are masured at minimum cycle test.
3. I
(Max.) are mesured under the condition of TTL input level.
CC2
4. V (Min.)andV (Max.)arereferencelevelsformeasuringtimingofinputsignals.
IH
IL
Also, transition times are measured between V and V .
IH
IL
5. An initial pause of 200 ms is required after power-up followed by any 8 RAS cycles
(DT/OE “high”) and any 8 SC cycles before proper divice operation is achieved. In
the case of using an internal refresh counter, a minimum of 8 CAS before RAS
initialization cycles in stead of 8 RAS cycles are required.
6. AC measurements assume t = 5 ns.
T
7. RAM port outputs are mesured with a load equivalent to 1 TTL load and 100 pF.
Output reference levels are V /V = 2.4 V/0.8 V.
OH
OL
8. SAM port outputs are measured with a load equivalent to 1 TTL load and 30 pF.
Output reference levels are V /V = 2.0 V/0.8 V.
OH
OL
9. t
(Max.), t
(Max.), t
(Max.) and t
(Max.) difine the time at which the
OFF
OEZ
SDZ
SEZ
outputs achieve the open circuit condition and are not reference to output voltage
levels.
10. Either t
or t
must be satisfied for a read cycle.
RCH
RRH
11. These parameters are referenced to CAS leading edge of early write cycles and to
WB/WE leading edge in OE controlled write cycles and read modify write cycles.
12. t
, t
, t
and t
are not restrictive operating parameters. They are
WCS RWD CWD
AWD
included in the data sheet as electrical characteristics only.
If t ≥ t (Min.), the cycle is an early write cycle, and the data out pin will
WCS
WCS
remain open circuit (high impedance) throughout the entire cycle : If t
≥ t
RWD
RWD
(Min.), t
≥ t
(Min.) and t
≥ t
(Min.) the cycle is a read-write cycle
CWD
CWD
AWD
AWD
and the data out will contain data read from the selected cell : If neither of the above
sets of conditions is satisfied, the condition of the data out (at access time) is
indterminate.
13. Operation within the t
(Max.) limit ensures that t
(Max.) can be met. t
RCD
RAC
RCD
RCD
(Max.)isspecifiedasareferencepointonly:Ift
isgreaterthanthespecifiedt
RCD
(Max.) limit, then access time is controlled by t
.
CAC
14. Operation within the t
(Max.) limit ensures that t
(Max.) can be met. t
RAC
RAD
RAD
RAD
(Max.)isspecifiedasareferencepointonly:Ift
isgreaterthanthespecifiedt
RAD
(Max.) limit, then access time is controlled by t
.
AA
15. Input levels at the AC parameter measurement are 3.0 V/0 V.
16. Stresses greater than those listed under “Absolute Maximum Ratings” may cause
permenent damege to the device.
17. All voltages are referenced to V .
SS
9/45
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