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KM68B261A-8 Scheda tecnica(PDF) 6 Page - Samsung semiconductor

Il numero della parte KM68B261A-8
Spiegazioni elettronici  32K x 8 Bit High-Speed BiCMOS Static RAM
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Produttore elettronici  SAMSUNG [Samsung semiconductor]
Homepage  http://www.samsung.com/Products/Semiconductor
Logo SAMSUNG - Samsung semiconductor

KM68B261A-8 Scheda tecnica(HTML) 6 Page - Samsung semiconductor

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KM68B261A
BiCMOS SRAM
Rev 2.0
October-1994
6
Address
/CS
Data In
/WE
Data Out
High-Z
High-Z
(10)
(9)
TIMING WAVE FORM OF WRITE CYCLE(2) (/OELowFixed)
Data Valid
tWC
tWR(5)
tDH
tWHZ(6,7)
tAW
tCW(3)
tWP(2)
tAS(4)
tOH
tOW
tDW
NOTES (WRITE CYCLE)
All write cycle timing is referenced from the last valid address to the first transition address.
A write occurs during the overlap of a low /CS and a low /WE. A write begins at the latest transition among
/CS going low and /WE going low; A write ends at the earliest transition among /CS going high and /WE going
high. tWP is measured from the beginning of write to the end of write.
tCW is measured from the later of /CS going low to end of write.
tAS is measured from the address valid to the beginning of write.
tWR is measured from the end of write to the address change. tWR applied in case a write ends as /CS, or
/WE going high.
If /OE, /CS and /WE are in the Read Mode during this period, the I/O pins are in the output low-Z state. Inputs
of opposite phase of the output must not be applied because bus contention can occur.
For common I/O applications, minimization or elimination of bus contention conditions is necessary during read
and write cycle.
If /CS goes low simultaneously with /WE going low or after /WE going low, the outputs remain high impedance
state.
Dout is the read data of the new address.
When /CS is low : I/O pins are in the output state. The input signals in the opposite phase leading to the output
should not be applied.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
FUNCTIONAL DESCRIPTION
/CS
/WE
/OE
Mode
I/O Pin
Supply Current
H
L
L
L
X
H
H
L
X*
H
L
X
Not Select
Output Disable
Read
Write
High-Z
High-Z
DOUT
DIN
ISB, ISB1
ICC
ICC
ICC
*Note : X means Don't Care.


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