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KMM5321204C2W Scheda tecnica(PDF) 7 Page - Samsung semiconductor

Il numero della parte KMM5321204C2W
Spiegazioni elettronici  1Mx32 DRAM SIMM (1MX16 Base)
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Produttore elettronici  SAMSUNG [Samsung semiconductor]
Homepage  http://www.samsung.com/Products/Semiconductor
Logo SAMSUNG - Samsung semiconductor

KMM5321204C2W Scheda tecnica(HTML) 7 Page - Samsung semiconductor

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DRAM MODULE
KMM5321204C2W/C2WG
Rev. 0.0 (Nov. 1997)
- 7 -
NOTES
An initial pause of 200us is required after power-up followed
by any 8 RAS-only or CAS-before-RAS refresh cycles before
proper device operation is achieved.
VIH(min) and V IL(max) are reference levels for measuring
timing of input signals. Transition times are measured
between V IH(min) and V IL(max) and are assumed to be 5ns
for all inputs.
Measured with a load equivalent to 2 TTL loads and 100pF.
Operation within the
tRCD(max) limit insures that tRAC(max)
can be met.
tRCD(max) is specified as a reference point only.
If
tRCD is greater than the specified tRCD(max) limit, then
access time is controlled exclusively by
tCAC.
Assumes that
tRCD
tRCD(max).
This parameter defines the time at which the output achieves
the open circuit condition and is not referenced to V OH or
VOL.
tWCS is non-restrictive operating parameter. It is included in
the
data
sheet
as
electrical
characteristic s
only.
If
tWCS
tWCS(min), the cycle is an early write cycle and the
data out pin will remain high impedance for the duration of
the cycle.
Either
tRCH or tRRH must be satisfied for a read cycle.
These parameter are referenced to the CAS leading edge in
early write cycles and to the W leading edge in read-write
cycles.
Operation within the
tRAD(max) limit insures that tRAC(max)
can be met.
tRAD(max) is specified as reference point only. If
tRAD is greater than the specified tRAD(max) limit, then
access time is controlled by
tAA.
tCEZ(max), tREZ(max), tWEZ(max) and tOEZ(max) define the
time at which the output achieves the open circuit condition
and are not referenced to output voltage level.
If RAS goes to high before CAS high going, the open circuit
condtion of the output is achieved by CAS high going. If CAS
goes to high before RAS high going, the open circuit condi-
tion of the output is achieved by RAS high going.
tASC
tCP min
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
Test condition : Vih/Vil=2.4/0.8V, V oh/Vol=2.0/0.8V, Output loading CL=100pF
Parameter
Symbol
-5
-6
Unit
Note
Min
Max
Min
Max
Hyper page mode cycle time
tHPC
25
30
ns
13
CAS precharge time(Hyper page cycle)
tCP
8
10
ns
RAS pulse width(Hyper page cycle)
tRASP
50
200K
60
200K
ns
RAS hold time from CAS precharge
tRHCP
30
35
ns
W to RAS precharge time(C-B-R refresh)
tWRP
10
10
ns
W to RAS hold time(C-B-R refresh)
tWRH
10
10
ns
Output data hold time
tDOH
5
5
ns
Output buffer turn off delay from RAS
tREZ
3
13
3
15
ns
6,11,12
Output buffer turn off delay from W
tWEZ
3
13
3
15
ns
6,11
W to data delay
tWED
15
15
ns
W pulse width (Hyper Page Cycle)
tWPE
5
5
ns
AC CHARACTERISTICS (0
°C≤TA≤70°C, VCC=5.0V±10%. See notes 1,2.)
11.
12.
13.


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