Datasheet

Table 18. Input logic level
Symbol
Parameter
-25
Unit
Note
Min.
Max.
V
IH
(DC)
DC Input logic High Voltage
V
IL
(DC)
DC Input Low Voltage
V
IH
(AC)
AC Input High Voltage
V
IL
(AC)
AC Input Low Voltage
V
ID
(AC)
AC Differential Voltage
V
DDQ
+ 0.3
0.5
V
DDQ
V
1
V
IX
(AC)
AC Differential crosspoint Voltage
0.5 x V
DDQ
- 0.175
0.5 x V
DDQ
+ 0.175
V
2
NOTE1: VID(AC) specifies the input differential voltage |VTR -VCP| required for switching, where VTR is the true
input signal (such as CK, DQS, LDQS or UDQS) and VCP is the complementary input signal (such as CK,
DQS, LDQS or UDQS). The minimum value is equal to VIH (ac) - VIL (ac).
NOTE2: The typical value of VIX (ac) is expected to be about 0.5 x VDDQ of the transmitting device and VIX (ac) is
expected to track variations in VDDQ. VIX (ac) indicates the voltage at which differential input signals must
cross.
NOTE3: 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
0.5 x V
DDQ
- 0.125
0.5 x V
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
Unit
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
V
REF
+ 0.125
V
REF
+ 0.2
V
REF
- 0.125
V
REF
- 0.2
Vss
Q
- V
peak
-0.3
V
DDQ
+ V
peak
V
V
V
V
AS4C64M16D2A-25BIN
AS4C64M16D2A-25BCN
Confidential
- 24 of 62 -
Rev.1.1 October 2017