Datasheet

SM646UDR26485-2-I
January 31, 2006
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16
Absolute Maximum Ratings
Notes:
1. It is possible to operate the DRAM above Case Temperature up to 95ºC.
2. Above 85°C DRAM Case Temperature the Auto-Refresh command interval has to be reduced to t
REFI
= 3.9µs
Parameter Symbol Ratings Unit Notes
Voltage on V
DD
relative to V
SS
V
DD
-1.0 ~ 2.3 V
Voltage on V
DDQ
relative to V
SS
V
DDQ
-0.5 ~ 2.3 V
Voltage on any pin relative to V
SS
V
IN,
V
OUT
-0.5 ~ 2.3 V
Voltage on V
DDSPD
relative to V
SS
V
DDSPD
1.7 ~ 3.6 V
Operating Temperature (Ambient) T
OPR
0 to +65 °C
Operating Temperature (Case) T
CASE
0 to +95 °C 1, 2
Storage Temperature T
STG
-55 to +100 °C
DC Characteristics
Recommended DC Operating Conditions
(T
A
= 0 to +65°C)
Notes:
1. V
REF
is expected to track variation in V
DDQ
. V
REF
= 0.5 x V
DDQ
.
2. Peak to peak noise (non-common mode) on V
REF
may not exceed ±1% of the DC value. Peak to peak AC
noise on V
REF
may not exceed ±2% of V
REF
(DC). This measurement is to be taken at the nearest V
REF
bypass capacitor.
3. V
TT
is not used on the module. It is the voltage used on the system board to terminate all the signals. However,
this supply should track the variations in DC level of V
REF
.
Parameter Symbol Min Typ Max Unit Notes
Supply Voltage V
DD
1.7 1.8 1.9 V
I/O Supply Voltage V
DDQ
1.7 1.8 1.9 V
I/O Reference Voltage V
REF
0.49*V
DDQ
0.50*V
DDQ
0.51*V
DDQ
mV 1, 2
I/O Termination Voltage V
TT
V
REF
- 0.04 V
REF
V
REF
+ 0.04 V 3
SPD Voltage V
DDSPD
1.7 - 3.6 V
Input High Voltage V
IH(DC)
V
REF
+ 0.125 - V
DDQ
+ 0.3 V
Input Low Voltage V
IL(DC)
-0.3 - V
REF
- 0.125 V
Input Voltage Level, CK/CK# V
IN(DC)
-0.3 - V
DDQ
+ 0.3 V
Input Differential Voltage, CK/CK# V
ID(DC)
0.25 - V
DDQ
+ 0.6 V
Ground V
SS
000V