WED9LC6816V 查看數據表（PDF） - White Electronic Designs Corporation
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WED9LC6816V Datasheet PDF : 27 Pages
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White Electronic Designs
WED9LC6816V
SDRAM AC Characteristics
(Vcc = 3.3V -5% / +10% unless otherwise noted; 0°C Ta 70°C, Commercial; -40°C Ta 85°C, Industrial)
Parameter
Clock Cycle Time (1)
Clock to valid Output delay (1,2)
Output Data Hold Time (2)
Clock HIGH Pulse Width (3)
Clock LOW Pulse Width (3)
Input Setup Time (3)
Input Hold Time (3)
CK# to Output Low-Z (2)
CK# to Output High-Z
Row Active to Row Active Delay (4)
RAS# to CAS# Delay (4)
Row Precharge Time (4)
Row Active Time (4)
Row Cycle Time - Operation (4)
Row Cycle Time - Auto Refresh (4,8)
Last Data in to New Column Address Delay (5)
Last Data in to Row Precharge (5)
Last Data in to Burst Stop (5)
Column Address to Column Address Delay (6)
Number of Valid Output Data (7)
CL = 3
CL = 2
Symbol
tCC
tCC
tSAC
tOH
tCH
tCL
tSS
tSH
tSLZ
tSHZ
tRRD
tRCD
tRP
tRAS
tRC
tRFC
tCDL
tRDL
tBDL
tCCD
125MHz
Min
Max
8
1000
10
1000
6
3
3
3
2
1
2
7
20
20
20
50 10,000
70
70
1
1
1
1.5
2
1
100MHz
Min Max
10 1000
12 1000
7
3
3
3
2
1
2
7
20
20
20
50 10,000
80
80
1
1
1
1.5
2
2
83MHz
Min Max
12
1000
15
1000
8
3
3
3
2
1
2
8
24
24
24
60 10,000
90
90
1
1
1
1.5
2
1
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
CK#
CK#
CK#
CK#
ea
NOTES:
1. Parameters depend on programmed CAS latency.
2. If clock rise time is longer than 1ns (trise/2 -0.5)ns should be added to the parameter.
3. Assumed input rise and fall time = 1ns. If trise of tfall are longer than 1ns. [(trise = tfall)/2] - 1ns should be added to the parameter.
4. The minimum number of clock cycles required is detemined by dividing the minimum time required by the clock cycle time and then rounding up to the next higher integer.
5. Minimum delay is required to complete write.
6. All devices allow every cycle column address changes.
7. In case of row precharge interrupt, auto precharge and read burst stop.
8. A new command may be given tRFC after self-refresh exit.
Contact factory for ordering information.
White Electronic Designs Corp. reserves the right to change products or specifications without notice.
September, 2003
Rev. 1
8
White Electronic Designs Corporation • (602) 437-1520 • www.wedc.com
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