GS4576C09/18/36L
AC Electrical Characteristics (Continued)
–18
–24
–25
–33
Parameter
Symbol
Min
Max
Min
Max
Min
Max
Min
Max
Refresh
Average Periodic Refresh
Interval
tREFI
—
0.24
—
0.24
—
0.24
—
0.24
10
Notes:
1. All timing parameters are measured relative to the crossing point of CK/CK, DK/DK and to the crossing point with V
of the command,
REF
address, and data signals.
2. Outputs measured with equivalent load:
V
TT
50
DQ
Test Point
10 pF
V
OUT
3. Tests for AC timing I , and electrical AC and DC characteristics may be conducted at nominal reference/supply voltage levels, but the
DD
related specifications and device operations are tested for the full voltage range specified.
4. AC timing may use a V – to–V swing of up to 1.5 V in the test environment, but input timing is still referenced to V (or to the crossing
IL
IH
REF
point for CK/CK), and parameter specifications are tested for the specified AC input levels under normal use conditions. The minimum slew
rate for the input signals used to test the device is 2 V/ns in the rance between V and V
.
IH(AC)
IL(AC)
5. Clock phase jitter is the variance from clock rising edge to the next expected clock rising edge.
6. Frequency drift is not allowed.
7. tQKQ0 is referenced to DQ0–DQ17 for the x36 xconfiguration and DQ0–DQ8 for the x18 configuration. tQKQ1 is referenced to
DQ18–DQ35 for the x36 configuration and the DQ9–DQ17 for the x18 configuration.
8. tQKQ takes in to account the skew between any QKx and any Q.
9. tDVW (MIN) tQHP – (tQKQx [MAX] + |tQKQx [MIN]|)
10. To improve efficiency, eight AREF commands (one for each bank) can be posted to the LLDRAM II on consecutive cycles at periodic
intervals of 1.95 s
Rev: 1.04 11/2013
48/62
© 2011, GSI Technology
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
GSI [ GSI TECHNOLOGY ]
