AS4C64M8D2
Table 16. Input logic level (
VDD = 1.8V 0.1V, TOPER = 0~95 C)
-25/3
Unit
Symbol
Parameter
Min.
VREF + 0.125
- 0.3
Max.
VIH (DC)
VIL (DC)
VIH (AC)
VIL (AC)
VID (AC)
VIX (AC)
DC Input logic High Voltage
DC Input Low Voltage
VDDQ + 0.3
VREF - 0.125
VDDQ + Vpeak
VREF - 0.2
VDDQ
V
V
V
V
V
V
AC Input High Voltage
VREF + 0.2
VSSQ - Vpeak
0.5
AC Input Low Voltage
AC Differential Voltage
AC Differential cross point Voltage
0.5 x VDDQ - 0.175 0.5 x VDDQ + 0.175
NOTE1: Refer to Overshoot/undershoot specification for Vpeak value: maximum peak amplitude allowed for
overshoot and undershoot.
Table 17. AC Input test conditions
(VDD = 1.8V 0.1V, TOPER = 0~95 C)
Value
Symbol
Parameter
Input reference voltage
Unit Note
VREF
0.5 x VDDQ
1.0
V
V
1
1
VSWING(max) Input signal maximum peak to peak swing
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 VIH /IL (ac) level applied to the
device under test.
NOTE2: The input signal minimum slew rate is to be maintained over the range from VREF to VIH(ac) min for rising
edges and the range from VREF to VIL (ac) max for falling edges .
NOTE3: AC timings are referenced with input waveforms switching from VIL (ac) to VIH (ac) on the positive
transitions and VIH (ac) to VIL (ac) on the negative transitions.
Table 18. Differential AC output parameters
(VDD = 1.8V 0.1V, TOPER = 0~95 C)
Value
Symbol
Parameter
Unit Note
Min.
Max.
0.5xVDDQ+0.125
Vox(ac)
AC Differential Cross Point Voltage
0.5xVDDQ-0.125
V
1
NOTE1: The typical value of VOX (ac) is expected to be about 0.5 x VDDQ of the transmitting device and VOX (ac) is
expected to track variations in VDDQ. VOX (ac) indicates the voltage at which differential output signals must
cross.
Table 19. AC overshoot/undershoot specification for address and control pins
(A0-A12, BA0-BA1, CS#, RAS#, CAS#, WE#, CKE, ODT)
-25
0.5
-3
Parameter
Unit
V
Maximum peak amplitude allowed for overshoot area
Maximum peak amplitude allowed for undershoot area
Maximum overshoot area above VDD
0.5
0.5
0.8
0.8
0.5
V
0.66
0.66
V-ns
V-ns
Maximum undershoot area below VSS
Confidential
21
Rev. 1.0
Feb. /2014
ALSC [ ALLIANCE SEMICONDUCTOR CORPORATION ]
