W949D6DB Datasheet, PDF (57/60 Pages) Winbond – Standard Self Refresh Mode

W949D6DB / W949D2DB
9.5.2 Output Slew Rate Characteristics
PARAMETER
Pull-up and Pull-Down Slew Rate for Full Strength Driver
Pull-up and Pull-Down Slew Rate for Three-Quarter Strength
Driver
Pull-up and Pull-Down Slew Rate for Half Strength Driver
Output Slew rate Matching ratio (Pull-up to Pull-down)
MIN
0.7
0.5
0.3
0.7
MAX
2.5
1.75
1.0
1.4
UNIT NOTES
V/nS
1,2
V/nS
1,2
V/nS
1,2
-
3
Notes:
1. Measured with a test load of 20 pF connected to VSSQ.
2. Output slew rate for rising edge is measured between VILD(DC) to VIHD(AC) and for falling edge between VIHD(DC) to
VILD(AC).
3. The ratio of pull-up slew rate to pull-down slew rate is specified for the same temperature and voltage, over the entire
temperature and voltage range. For a given output, it represents the maximum difference between pull-up and pull-down
drivers due to process variation.
9.5.3 AC Overshoot/Undershoot Specification
PARAMETER
Maximum peak amplitude allowed for overshoot
Maximum peak amplitude allowed for undershoot
The area between overshoot signal and VDD must be less than or equal to
The area between undershoot signal and GND must be less than or equal
to
SPECIFICATION
0.5 V
0.5 V
3 V-nS
3 V-nS
9.5.4 AC Overshoot and Undershoot Definition
2.5
Overshoot Area
2.0
VDD
1.5
1.0
Max Amplitude = 0.5V
0.5
0
Max Area = 3V-nS
VSS
-0.5
Undershoot Area
Time (nS)
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Publication Release Date: Oct. 08, 2014
Revision: A01-003