WED9LC6816V
White Electronic Designs
SDRAM AC Characteristics
(Vcc = 3.3V -5% / +10% unless otherwise noted; 0°C Ta 70°C, Commercial; -40°C Ta 85°C, Industrial)
125MHz
100MHz
83MHz
Min
Parameter
Symbol
tCC
Min
Max
1000
1000
6
Min
Max
1000
1000
7
Max
1000
1000
8
Units
ns
Clock Cycle Time (1)
CL = 3
CL = 2
8
10
12
12
15
tCC
10
ns
Clock to valid Output delay (1,2)
Output Data Hold Time (2)
tSAC
tOH
ns
3
3
3
2
1
2
3
3
3
2
1
2
3
3
3
2
1
2
ns
Clock HIGH Pulse Width (3)
Clock LOW Pulse Width (3)
Input Setup Time (3)
tCH
ns
tCL
ns
tSS
ns
Input Hold Time (3)
tSH
ns
CK# to Output Low-Z (2)
tSLZ
tSHZ
tRRD
tRCD
tRP
ns
CK# to Output High-Z
7
7
8
ns
Row Active to Row Active Delay (4)
RAS# to CAS# Delay (4)
20
20
20
50
70
70
1
20
20
20
50
80
80
1
24
24
24
60
90
90
1
ns
ns
Row Precharge Time (4)
ns
Row Active Time (4)
tRAS
tRC
10,000
10,000
10,000
ns
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)
ns
tRFC
tCDL
tRDL
tBDL
tCCD
ns
CK#
CK#
CK#
CK#
1
1
1
1
1
1
1.5
2
1.5
2
1.5
2
ea
1
2
1
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
WEDC [ WHITE ELECTRONIC DESIGNS CORPORATION ]
