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IS62VV25616LL-85MI Datasheet(PDF) 7 Page - Integrated Silicon Solution, Inc

Part # IS62VV25616LL-85MI
Description  256K x 16 LOW VOLTAGE, 1.8V ULTRA LOW POWER CMOS STATIC RAM
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Manufacturer  ISSI [Integrated Silicon Solution, Inc]
Direct Link  http://www.issi.com
Logo ISSI - Integrated Silicon Solution, Inc

IS62VV25616LL-85MI Datasheet(HTML) 7 Page - Integrated Silicon Solution, Inc

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Integrated Silicon Solution, Inc. — www.issi.com — 1-800-379-4774
7
Rev. B
08/07/02
IS62VV25616LL
ISSI®
WRITE CYCLE SWITCHING CHARACTERISTICS(1,2) (Over Operating Range)
-70
-85
Symbol
Parameter
Min.
Max.
Min.
Max.
Unit
tWC
Write Cycle Time
70
85
1ns
tSCE
CE to Write End
65
70
ns
tAW
Address Setup Time to Write End
65
70
ns
tHA
Address Hold from Write End
0
0
ns
tSA
Address Setup Time
0
0
ns
tPWB
LB, UB Valid to End of Write
60
70
ns
tPWE
WE Pulse Width
55
60
ns
tSD
Data Setup to Write End
30
35
ns
tHD
Data Hold from Write End
0
0
ns
tHZWE(3)
WE LOW to High-Z Output
30
30
ns
tLZWE(3)
WE HIGH to Low-Z Output
5
5
ns
Notes:
1. Test conditions assume signal transition times of 5 ns or less, timing reference levels of 0.9V, input pulse levels of 0.4V to 1.4V and
output loading specified in Figure 1.
2. The internal write time is defined by the overlap of
CE LOW and UB or LB, and WE LOW. All signals must be in valid states to initiate a Write, but
any one can go inactive to terminate the Write. The Data Input Setup and Hold timing are referenced to the rising or falling edge of the signal that terminates the write.
3. Tested with the load in Figure 2. Transition is measured ±500 mV from steady-state voltage. Not 100% tested.
Notes:
1. WRITE is an internally generated signal asserted during an overlap of the LOW states on the
CE and WE inputs and at least one of
the
LB and UB inputs being in the LOW state.
2. WRITE = (
CE) [ (LB) = (UB) ] (WE).
AC WAVEFORMS
WRITE CYCLE NO. 1(1,2) (CE Controlled, OE = HIGH or LOW)
DATA UNDEFINED
t WC
VALID ADDRESS
t SCS
t PWE1
t PWE2
t AW
t HA
HIGH-Z
t PBW
t HD
t SA
t HZWE
ADDRESS
CE
UB, LB
WE
DOUT
DIN
DATAIN VALID
t LZWE
t SD
UB_CSWR1.eps


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