EDD2516AKTA-E
13. tDAL = (tWR/tCK)+(tRP/tCK)
For each of the terms above, if not already an integer, round to the next highest integer.
Example: For –7A Speed at CL = 2.5, tCK = 7.5ns, tWR = 15ns and tRP= 20ns,
tDAL = (15ns/7.5ns) + (20ns/7.5ns) = (2) + (3)
tDAL = 5 clocks
Test Conditions
Parameter
Symbol
VREF
Value
Unit
V
Input reference voltage
Termination voltage
Input high voltage
Input low voltage
VDDQ/2
VREF
VTT
V
VIH (AC)
VIL (AC)
VREF + 0.31
VREF − 0.31
V
V
Input differential voltage, CK and /CK
inputs
VID (AC)
0.62
V
Input differential cross point voltage,
CK and /CK inputs
Input signal slew rate
VIX (AC)
SLEW
VREF
1
V
V/ns
tCK
VDD
VREF
VSS
CK
VID
/CK
tCL
tCH
VIX
VDD
VIH
VREF
VIL
VSS
∆t
SLEW = (VIH (AC) – VIL (AC))/∆t
VTT
Measurement point
DQ
RT = 50Ω
CL = 30pF
Input Waveforms and Output Load
Data Sheet E0502E30 (Ver. 3.0)
8