AS4C128M8D2 Datasheet, PDF (22/59 Pages) Alliance Semiconductor Corporation – AS4C128M8D2

AS4C128M8D2
Table 17. Input logic level (V_DD = 1.8V  0.1V, T_OPER = -40~95 C)
Symbol
Parameter
-25
Unit
Min.
Max.
VIH (DC) DC Input logic High Voltage
V_REF + 0.125
V_DDQ + 0.3
V
VIL (DC) DC Input Low Voltage
-0.3
V_REF - 0.125
V
VIH (AC) AC Input High Voltage
V_REF + 0.2
V_DDQ+V_PEAK
V
VIL (AC) AC Input Low Voltage
Vss_Q –V_PEAK
V_REF – 0.2
V
VID (AC) AC Differential Voltage
0.5
V_DDQ + 0.6
V
VIX (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 18. AC Input test conditions (V_DD = 1.8V  0.1V, T_OPER = -40~95 C)
Symbol
Parameter
-25
Unit Note
VREF Input reference voltage
0.5 x V_DDQ
V1
VSWING(max) Input signal maximum peak to peak swing
1.0
V1
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 19. Differential AC output parameters (V_DD = 1.8V  0.1V, T_OPER = -40~95 C)
Symbol
Parameter
-25
Min.
Max.
Unit Note
Vox(ac) AC Differential Cross Point Voltage
0.5xV_DDQ-0.125
0.5xV_DDQ+0.125
V1
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 20. AC overshoot/undershoot specification for address and control pins
(A0-A12, BA0-BA2, CS#, RAS#, CAS#, WE#, CKE, ODT)
Parameter
Maximum peak amplitude allowed for overshoot area
Maximum peak amplitude allowed for undershoot area
Maximum overshoot area above V_DD
Maximum undershoot area below V_SS
-25
Unit
0.5
V
0.5
V
0.66
V-ns
0.66
V-ns
Alliance Memory Inc. 551 Taylor Way, San Carlos, CA 94070
TEL: [phone]
FAX: [phone]
Alliance Memory Inc. reserves the right to change products or specification without notice.
22
Rev. 1.0
June 2013