K4S640832F Datasheet, PDF (8/11 Pages) Samsung semiconductor – 64Mbit SDRAM 2M x 8Bit x 4 Banks Synchronous DRAM LVTTL

K4S640832F
AC CHARACTERISTICS (AC operating conditions unless otherwise noted)
Parameter
Symbol
CLK cycle time
CAS latency=3
tCC
CAS latency=2
CLK to valid
output delay
CAS latency=3
tSAC
CAS latency=2
Output data
hold time
CAS latency=3
tOH
CAS latency=2
CLK high pulse width
tCH
CLK low pulse width
tCL
Input setup time
tSS
Input hold time
tSH
CLK to output in Low-Z
tSLZ
CLK to output
in Hi-Z
CAS latency=3
tSHZ
CAS latency=2
- 75
Min
Max
7.5
1000
10
5.4
6
3
3
2.5
2.5
1.5
0.8
1
5.4
6
Notes : 1. Parameters depend on programmed CAS latency.
2. If clock rising time is longer than 1ns, (tr/2-0.5)ns should be added to the parameter.
3. Assumed input rise and fall time (tr & tf) = 1ns.
If tr & tf is longer than 1ns, transient time compensation should be considered,
i.e., [(tr + tf)/2-1]ns should be added to the parameter.
CMOS SDRAM
Unit
Note
ns
1
ns
1,2
ns
2
ns
3
ns
3
ns
3
ns
3
ns
2
ns
DQ BUFFER OUTPUT DRIVE CHARACTERISTICS
Parameter
Symbol
Condition
Min
Typ
Max
Output rise time
trh
Measure in linear
region : 1.2V ~1.8V
1.37
4.37
Output fall time
tfh
Measure in linear
region : 1.2V ~1.8V
1.30
3.8
Output rise time
trh
Measure in linear
region : 1.2V ~1.8V
2.8
3.9
5.6
Output fall time
tfh
Measure in linear
region : 1.2V ~1.8V
2.0
2.9
5.0
Notes : _{1. Rise time specification based on 0pF + 50 Ohms to VSS, use these values to design to.}
2. Fall time specification based on 0pF + 50 Ohms to VDD, use these values to design to.
3. Measured into 50pF only, use these values to characterize to.
4. All measurements done with respect to VSS.
Unit
Volts/ns
Volts/ns
Volts/ns
Volts/ns
Notes
3
3
1,2
1,2
Rev.1.1 May. 2003