W256 Cypress Semiconductor Corp., W256 Datasheet - Page 5

• Manufacturer Part Number: W256
• Description: 12 Output Buffer For 2 DDR And 3 Sdram Dimms
• Manufacturer: Cypress Semiconductor Corp.

Switching Characteristics
Switching Waveforms
Duty Cycle Timing
All Outputs Rise/Fall Time
Output-Output Skew
--
--
t
t
t
t
t
t
t
t
Parameter
3
4
3d
4d
5
6
7
8
Notes:
3.
4.
OUTPUT
OUTPUT
OUTPUT
All parameters specified with loaded outputs.
Duty cycle of input clock is 50%. Rising and falling edge rate is greater than 1V/ns.
Duty Cycle
SDRAM Rising Edge Rate
SDRAM Falling Edge Rate
DDR Rising Edge Rate
DDR Falling Edge Rate
Output to Output Skew
SDRAM Buffer HH Prop. Delay
SDRAM Buffer LLProp. Delay
SDRAM Buffer LLProp. Delay
Operating Frequency
t
0.4V
3
2.4V
t
5
[2,4]
Name
= t
t
2
2
[Figure 3]
t
1
[2]
t
[2]
1
[2]
2.4V
Preliminary
0.4V
[2]
[2]
t
4
[2]
[2]
[2]
Measured at 1.4V for 3.3V outputs
Measured at VDD/2 for 2.5V outputs.
Measured between 0.4V and 2.4V
Measured between 2.4V and 0.4V
Measured between 20% to 80% of
output (Refer to Figure 1)
Measured between 20% to 80% of
output (Refer to Figure 1)
All outputs equally loaded
Input edge greater than 1 V/ns
Input edge greater than 1 V/ns
Input edge greater than 1 V/ns
Test Conditions
5
3.3V
0V
IN
Min.
–5%
1.0
1.0
0.5
0.5
66
5
5
5
DC
Typ.
Max.
IN
+5%
2.50
2.50
1.50
1.50
133
100
10
10
10
DC
W256
MHz
V/ns
V/ns
V/ns
V/ns
Unit
ps
ns
ns
ns
%