Datasheet

Table 18. Input logic level
Symbol
Parameter
-25
Unit
Min.
Max.
V
IH
(DC)
DC Input logic High Voltage
V
REF
+ 0.125
V
DDQ
+ 0.3
V
V
IL
(DC)
DC Input Low Voltage
-0.3
V
REF
- 0.125
V
V
IH
(AC)
AC Input High Voltage
V
REF
+ 0.2
V
DDQ
+V
peak
V
V
IL
(AC)
AC Input Low Voltage
Vss
Q
–V
peak
V
REF
– 0.2
V
V
ID
(AC)
AC Differential Voltage
0.5
V
DDQ
V
V
IX
(AC)
AC Differential crosspoint Voltage
0.5 x V
DDQ
-0.175
0.5 x V
DDQ
+0.175
V
NOTE1: Refer to Overshoot/undershoot specification for V
peak
value: maximum peak amplitude allowed for overshoot
and undershoot.
Table 19. AC Input test conditions
Symbol
Parameter
Value
Unit
Note
V
REF
Input reference voltage
0.5 x V
DDQ
V
1
V
SWING(max)
Input signal maximum peak to peak swing
1.0
V
1
Slew Rate
Input signal minimum slew rate
1.0
V/ns
2, 3
NOTE1: Input waveform timing is referenced to the input signal crossing through the V
IH
/
IL
(ac) level applied to the
device under test.
NOTE2: The input signal minimum slew rate is to be maintained over the range from V
REF
to V
IH
(ac) min for rising
edges and the range from V
REF
to V
IL
(ac) max for falling edges .
NOTE3: AC timings are referenced with input waveforms switching from V
IL
(ac) to V
IH
(ac) on the positive transitions
and V
IH
(ac) to V
IL
(ac) on the negative transitions.
Table 20. Differential AC output parameters
Symbol
Parameter
Value
Unit
Note
Min.
Max.
V
ox(ac)
AC Differential Cross Point Voltage
0.5xV
DDQ
-0.125
0.5xV
DDQ
+0.125
V
1
NOTE1: The typical value of V
OX
(ac) is expected to be about 0.5 x V
DDQ
of the transmitting device and V
OX
(ac) is
expected to track variations in V
DDQ
. V
OX
(ac) indicates the voltage at which differential output signals must
cross.
Table 21. AC overshoot/undershoot specification for address and control pins
(A0-A12, BA0-BA2, CS#, RAS#, CAS#, WE#, CKE, ODT)
Parameter
-25
U
nit
Maximum peak amplitude allowed for overshoot area 0.5
V
Maximum peak amplitude allowed for undershoot area 0.5
V
Maximum overshoot area above V
DD
0.66
V-ns
Maximum undershoot area below V
SS
0.66
V-ns
AS4C128M16D2A-25BCN
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Rev.1.0 Dec 2015