Unbuffered SODIMM
datasheet
Rev. 1.0
DDR3 SDRAM
11. AC & DC Output Measurement Levels
11.1 Single Ended AC and DC Output Levels
[ Table 7 ] Single Ended AC and DC output levels
Symbol | Parameter | Units | NOTE | |
VOH(DC) | DC output high measurement level (for IV curve linearity) | 0.8 x VDDQ | V |
|
VOM(DC) | DC output mid measurement level (for IV curve linearity) | 0.5 x VDDQ | V |
|
VOL(DC) | DC output low measurement level (for IV curve linearity) | 0.2 x VDDQ | V |
|
VOH(AC) | AC output high measurement level (for output SR) | VTT + 0.1 x VDDQ | V | 1 |
VOL(AC) | AC output low measurement level (for output SR) | VTT - 0.1 x VDDQ | V | 1 |
NOTE : 1. The swing of
11.2 Differential AC and DC Output Levels
[ Table 8 ] Differential AC and DC output levels
Symbol | Parameter | Units | NOTE | |
VOHdiff(AC) | AC differential output high measurement level (for output SR) | +0.2 x VDDQ | V | 1 |
VOLdiff(AC) | AC differential output low measurement level (for output SR) | V | 1 |
NOTE : 1. The swing of
11.3 Single-ended Output Slew Rate
With the reference load for timing measurements, output slew rate for falling and rising edges is defined and measured between VOL(AC) and VOH(AC) for single ended signals as shown in below.
[ Table 9 ] Single ended Output slew rate definition
Description | Measured |
| Defined by | ||
From | To |
| |||
|
|
|
| ||
Single ended output slew rate for rising edge | VOL(AC) | VOH(AC) |
|
| |
| Delta TRse | ||||
|
|
|
| ||
|
|
|
|
|
|
Single ended output slew rate for falling edge | VOH(AC) | VOL(AC) |
|
| |
| Delta TFse | ||||
|
|
|
| ||
|
|
|
|
|
|
NOTE : Output slew rate is verified by design and characterization, and may not be subject to production test.
[ Table 10 ] Single ended output slew rate
Parameter | Symbol | Units | |||||||||
Min | Max | Min | Max | Min | Max | Min | Max | ||||
|
|
| |||||||||
Single ended output slew rate | SRQse | 2.5 | 5 | 2.5 | 5 | 2.5 | 5 | 2.5 | 5 | V/ns | |
|
|
|
|
|
|
|
|
|
|
|
Description : SR : Slew Rate
Q : Query Output (like in DQ, which stands for
se :
VOHdiff(AC)
VTT
VOLdiff(AC)
delta TFdiff | delta TRdiff |
Figure 6. Single-ended output slew rate definition
- 15 -