Timing Signals Specifications

The following are specifications for the Timing signals:

External Clock with Internal Strobe
Freq. Range
1MHZ to 50 MHz
 
Min
Typical
Max
Units
Pulse width
8
 
 
ns
XCLK to OCLK delay
60
 
70
ns
XCLK to OSTB delay  *
50
 
60
ns
Data setup time to XCLK **
12
 
 
ns
Data hold time to XCLK
5
 
 
ns
External Clock with External Strobe
External Clock Freq. Range
0 to 50MHz
External Strobe Freq. Range
0 to 50MHz
Pulse width
Min
Typical
Max
Units
External Clock
8
 
 
ns
External Strobe
8
 
 
ns
XCLK to OCLK delay
50
 
60
ns
XSTB to OSTB delay
50
 
60
ns
Data setup time to XSTB **
12
 
 
ns
Data hold time to OSTB
5
 
 
ns
External Control Inputs
Input Level High
2.0
 
5.1
V
Input Level Low
-0.1
 
0.8
V
Input Current High
 
 
10
mA
Input Current Low
 
 
10
mA
External Control Outputs
Type
74FCT162245T
Input Level High
2.4
 
2.4
V
Output Level Low
 
0.35
0.6
V
Output Current High
 
 
20
mA
Output Current Low
 
 
20
mA

* Timing depends on the strobe delay setting and typically is XCLK to OCLK timing minus strobe delay setting.

** Setup time depends on the selected memory and is given for a typical configuration.