UD61256JC08 데이터 시트보기 (PDF) - Zentrum Mikroelektronik Dresden AG
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UD61256JC08 Datasheet PDF : 13 Pages
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UD61256
Remarks:
1) The Input Low Voltage must not
drop below -0.3 V for more than
40 ns.
2) The current is inversely propor-
tional to the cycle time; the max.
current is measured in the shor-
test cycle time.
3) For test conditions see test con-
figuration for functional test and
timing diagrams.
4) VIHmin and VILmax are reference
levels for time measurement of
the input signals; transition times
are measured between VIH and
VIL.
5) tv(CAS) and tv(RAS) define the time
at which the data output goes to
High-Z; this time is not related to
any level.
6) tRASL-CASLmax and tRAS-CA are
given as reference points only;
they do not represent restrictive
conditions.
7) The access time is determined
by the three times ta(RAS), ta(CAS)
and ta(CA):
- if tRASL-CASL < tRASL-CASLmax and
tRAS-CA < tRAS-CAmax ta(RAS) is
valid,
- if tRASL-CASL > tRASL-CASLmax and
tsu(CA-CAS) < (ta(CA)max - ta(CAS)max)
ta(CA) is valid,
- if tRASL-CASL > tRASL-CASLmax and
tsu(CA-CAS) > (ta(CA)max - ta(CAS)max)
ta(CAS) is valid.
8) Measured with a load equivalent
to 2 TTL loads.
9) In a READ cycle either th(RAS-R)
or th(CAS-R) must be kept.
10) tsu(W-CAS), tRAS-W, tCAS-W and tsu(A)
do not represent restrictive para-
meters:
- if tsu(W-CAS) ≥ tsu(W-CAS)min, the
cycle is a WRITE cycle (CAS-
controlled) and the data output
remains in High-Z throughout the
whole CAS cycle,
- if tCAS-W > tCAS-Wmin,
tRAS-W > tRAS-Wmin and tsu(CA-W)RW
> tsu(CA-W)RWmin, the cycle is a
READ-WRITE cycle and the
content of the cell is available at
the data output,
- if none of these conditions is
satisfied, the condition of the
data output (at access time) is
indeterminate, since a WRITE
cycle (W-controlled) is carried
out.
11) These parameters refer to CAS
in the WRITE cycle (CAS-con-
trolled) and to W during WRITE
(W-controlled) or to W in the
READ-WRITE cycle, resp.
12) The values of tcmin are used for
indication of the particular cycle
time in which full function is gua-
ranteed in the temperature range
from 0 to 70 °C. Values below
the one shown above may cause
permanent damage to the com-
ponent.
December 12, 1997
7
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