EtronTech
EM68916CWQA
Table 18. Input logic level
(VDD = 1.8V ± 0.1V, TOPR = 0~85 °C)
-25/3
-37
Symbol
Parameter
Unit
Min.
VREF + 0.125
-0.3
Max.
Min.
VREF + 0.125
-0.3
Max.
VIH (dc) DC Input logic High Voltage
VIL (dc) DC Input Low Voltage
VIH (ac) AC Input High Voltage
VIL (ac) AC Input Low Voltage
VID (ac) AC Differential Voltage
VDDQ + 0.3
VDDQ + 0.3
VREF - 0.125
V
V
V
V
V
VREF - 0.125
VREF + 0.2
VSSQ - Vpeak
0.5
VDDQ + Vpeak VREF + 0.25 VDDQ + Vpeak
VREF – 0.2
VDDQ
VSSQ - Vpeak VREF – 0.25
0.5
VDDQ
0.5 x
VDDQ-0.175
0.5 x
VDDQ+0.175
0.5 x
VDDQ-0.175
0.5 x
VDDQ+0.175
VIX (ac) AC Differential crosspoint Voltage
V
NOTE1: Refer to Overshoot/undershoot specifications (Table 21 and Table 22) for Vpeak value: maximum peak
amplitude allowed for overshoot and undershoot.
Table 19. AC Input test conditions
(VDD = 1.8V ± 0.1V, TOPR = 0~85 °C)
-25/3/37
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 20. Differential AC output parameters
(VDD = 1.8V ± 0.1V, TOPR = 0~85 °C)
-25/3/37
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 21. AC overshoot/undershoot specification for address and control pins
(A0-A12, BA0-BA1, CS#, RAS#, CAS#, WE#, CKE, ODT)
Parameter
-25
0.5
-3
-37
0.5
0.5
1.0
1.0
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
Etron Confidential
23
Rev. 1.1
Apr. 2009
ETRON [ ETRON TECHNOLOGY, INC. ]
