HYB25D256[400/800/160]B[T/C](L)
256-Mbit Double Data Rate SDRAM
Electrical Characteristics
Table 14
Electrical Characteristics and DC Operating Conditions
Parameter
Symbol
Values
Typ.
Unit Note/Test Condition 1)
Min.
2.3
2.5
2.3
2.5
0
Max.
2.7
2.7
2.7
2.7
0
Device Supply Voltage
Device Supply Voltage
Output Supply Voltage
Output Supply Voltage
VDD
2.5
2.6
2.5
2.6
V
V
V
V
V
fCK ≤ 166 MHz
CK > 166 MHz 2)
fCK ≤ 166 MHz 3)
CK > 166 MHz 2)3)
VDD
f
VDDQ
VDDQ
f
Supply Voltage, I/O Supply VSS,
—
Voltage
VSSQ
VREF
VTT
4)
5)
Input Reference Voltage
0.49 × VDDQ 0.5 × VDDQ 0.51 × VDDQ
V
I/O Termination Voltage
(System)
V
REF – 0.04
V
REF + 0.04 V
8)
8)
8)
Input High (Logic1) Voltage VIH(DC)
Input Low (Logic0) Voltage VIL(DC)
V
REF + 0.15
V
V
V
DDQ + 0.3
V
–0.3
REF – 0.15 V
Input Voltage Level,
CK and CK Inputs
VIN(DC) –0.3
DDQ + 0.3
DDQ + 0.6
V
8)6)
7)
Input Differential Voltage, VID(DC) 0.36
CK and CK Inputs
V
V
VI-Matching Pull-up
Current to Pull-down
Current
VIRatio
0.71
–2
1.4
2
—
Input Leakage Current
II
µA Any input 0 V ≤ VIN ≤ VDD;
All other pins not under test
= 0 V 8)9)
Output Leakage Current
IOZ
IOH
IOL
–5
5
µA DQs are disabled;
0 V ≤ VOUT ≤ VDDQ
Output High Current,
Normal Strength Driver
—
–16.2
—
mA
V
OUT = 1.95 V
Output Low
16.2
mA
V
OUT = 0.35 V
Current, Normal Strength
Driver
1) 0 °C ≤ TA ≤ 70 °C; VDDQ = 2.5 V ± 0.2 V, VDD = +2.5 V ± 0.2 V (DDR333); VDDQ = 2.6 V ± 0.1 V, VDD = +2.6 V ± 0.1 V
(DDR400);
2) DDR400 conditions apply for all clock frequencies above 166 MHz
3) Under all conditions, VDDQ must be less than or equal to VDD
4) Peak to peak AC noise on VREF may not exceed ± 2% VREF (DC). VREF is also expected to track noise variations in VDDQ
5) VTT is not applied directly to the device. VTT is a system supply for signal termination resistors, is expected to be set equal
to VREF, and must track variations in the DC level of VREF
.
.
.
6) VID is the magnitude of the difference between the input level on CK and the input level on CK.
7) The ratio of the pull-up current to the pull-down current is specified for the same temperature and voltage, over the entire
temperature and voltage range, for device drain to source voltage from 0.25 to 1.0 V. For a given output, it represents the
maximum difference between pull-up and pull-down drivers due to process variation.
8) Inputs are not recognized as valid until VREF stabilizes.
9) Values are shown per component
Data Sheet
55
Rev. 1.21, 2004-07
02102004-TSR1-4ZWW
QIMONDA [ QIMONDA AG ]
