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K4T1G044QF Datasheet, PDF (13/46 Pages) Samsung semiconductor – 1Gb F-die DDR2 SDRAM
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K4T1G044QF
K4T1G084QF
K4T1G164QF
datasheet
Rev. 1.11
DDR2 SDRAM
7.2 Operating Temperature Condition
Symbol
Parameter
Rating
Units
NOTE
TOPER
Operating Temperature
0 to 95
°C
1, 2
NOTE :
1. Operating Temperature is the case surface temperature on the center/top side of the DRAM. For the measurement conditions, please refer to JESD51.2 standard.
2. At 85 - 95 °C operation temperature range, doubling refresh commands in frequency to a 32ms period ( tREFI=3.9 us ) is required, and to enter to self refresh mode at this
temperature range, an EMRS command is required to change internal refresh rate.
7.3 Input DC Logic Level
Symbol
VIH(DC)
VIL(DC)
Parameter
DC input logic high
DC input logic low
Min.
VREF + 0.125
- 0.3
Max.
VDDQ + 0.3
VREF - 0.125
Units
V
V
NOTE
7.4 Input AC Logic Level
Symbol
Parameter
DDR2-667, DDR2-800
Min.
Max.
NOTE
VIH(AC)
AC input logic high
VREF + 0.200
V
VIL(AC)
AC input logic low
VREF - 0.200
V
NOTE :
1. For information related to VPEAK value, Refer to overshoot/undershoot specification in device operation and timing datasheet; maximum peak ampli-
tude allowed for overshoot and undershoot.
7.5 AC Input Test Conditions
Symbol
Condition
Value
Units
NOTE
VREF
Input reference voltage
0.5 * VDDQ
V
1
VSWING(MAX)
Input signal maximum peak to peak swing
1.0
V
1
SLEW
Input signal minimum slew rate
1.0
V/ns
2, 3
NOTE :
1. Input waveform timing is referenced to the input signal crossing through the VIH/IL(AC) level applied to the device under test.
2. 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)
as shown in the below figure.
3. 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
max for falling edges
transitions.
delta TF
VREF - VIL(AC) max
Falling Slew =
delta TF
delta TR
VIH(AC) min
VIH(DC) min
VREF
VIL(DC) max
VIL(AC) max
VSS
VIH(AC) min - VREF
Rising Slew =
delta TR
Figure 1. AC Input Test Signal Waveform
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